WO2003065433A1 - Detergent liquide pour substrat de dispositif semi-conducteur et procede de nettoyage - Google Patents
Detergent liquide pour substrat de dispositif semi-conducteur et procede de nettoyage Download PDFInfo
- Publication number
- WO2003065433A1 WO2003065433A1 PCT/JP2003/000714 JP0300714W WO03065433A1 WO 2003065433 A1 WO2003065433 A1 WO 2003065433A1 JP 0300714 W JP0300714 W JP 0300714W WO 03065433 A1 WO03065433 A1 WO 03065433A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cleaning
- substrate
- acid
- group
- semiconductor device
- Prior art date
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- 238000004140 cleaning Methods 0.000 title claims abstract description 282
- 239000000758 substrate Substances 0.000 title claims abstract description 192
- 239000007788 liquid Substances 0.000 title claims abstract description 91
- 239000004065 semiconductor Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 66
- 239000003599 detergent Substances 0.000 title abstract description 6
- -1 polyoxyethylene group Polymers 0.000 claims abstract description 54
- 239000004094 surface-active agent Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 23
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 150000007524 organic acids Chemical class 0.000 claims abstract description 11
- 125000006353 oxyethylene group Chemical group 0.000 claims abstract description 11
- 239000004615 ingredient Substances 0.000 claims abstract description 8
- 125000001424 substituent group Chemical group 0.000 claims abstract description 8
- 125000001183 hydrocarbyl group Chemical group 0.000 claims abstract 4
- 239000002245 particle Substances 0.000 claims description 79
- 229910052751 metal Inorganic materials 0.000 claims description 52
- 239000002184 metal Substances 0.000 claims description 52
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 49
- 238000005406 washing Methods 0.000 claims description 49
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 31
- 229910052710 silicon Inorganic materials 0.000 claims description 28
- 239000010703 silicon Substances 0.000 claims description 28
- 239000008139 complexing agent Substances 0.000 claims description 20
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 19
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 13
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 235000011054 acetic acid Nutrition 0.000 claims description 10
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 150000002739 metals Chemical class 0.000 claims description 7
- 229910052723 transition metal Inorganic materials 0.000 claims description 7
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 6
- 150000003623 transition metal compounds Chemical class 0.000 claims description 6
- 150000003624 transition metals Chemical class 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 235000006408 oxalic acid Nutrition 0.000 claims description 5
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 4
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 150000005215 alkyl ethers Chemical class 0.000 claims description 4
- 150000001735 carboxylic acids Chemical class 0.000 claims description 4
- 235000015165 citric acid Nutrition 0.000 claims description 4
- 125000002768 hydroxyalkyl group Chemical group 0.000 claims description 4
- 229940098779 methanesulfonic acid Drugs 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 3
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 3
- 125000003545 alkoxy group Chemical group 0.000 claims description 3
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 3
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 3
- CCIVGXIOQKPBKL-UHFFFAOYSA-M ethanesulfonate Chemical compound CCS([O-])(=O)=O CCIVGXIOQKPBKL-UHFFFAOYSA-M 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 239000001630 malic acid Substances 0.000 claims description 3
- 235000011090 malic acid Nutrition 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 235000019260 propionic acid Nutrition 0.000 claims description 3
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 3
- BWEQSGJKNHMSPA-UHFFFAOYSA-N N.ON Chemical compound N.ON BWEQSGJKNHMSPA-UHFFFAOYSA-N 0.000 claims description 2
- QDHFHIQKOVNCNC-UHFFFAOYSA-N butane-1-sulfonic acid Chemical compound CCCCS(O)(=O)=O QDHFHIQKOVNCNC-UHFFFAOYSA-N 0.000 claims description 2
- KCXFHTAICRTXLI-UHFFFAOYSA-N propane-1-sulfonic acid Chemical compound CCCS(O)(=O)=O KCXFHTAICRTXLI-UHFFFAOYSA-N 0.000 claims description 2
- 125000001153 fluoro group Chemical group F* 0.000 claims 1
- 125000005843 halogen group Chemical group 0.000 claims 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims 1
- 239000010419 fine particle Substances 0.000 abstract description 7
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 3
- 230000001464 adherent effect Effects 0.000 abstract 1
- 239000002957 persistent organic pollutant Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 70
- 238000011109 contamination Methods 0.000 description 46
- 239000010408 film Substances 0.000 description 35
- 239000000463 material Substances 0.000 description 32
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 27
- 239000010949 copper Substances 0.000 description 26
- 230000000694 effects Effects 0.000 description 23
- 229910052757 nitrogen Inorganic materials 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 22
- 239000002253 acid Substances 0.000 description 16
- 230000008569 process Effects 0.000 description 14
- 229910052721 tungsten Inorganic materials 0.000 description 14
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 12
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 description 12
- 238000005530 etching Methods 0.000 description 11
- 239000012535 impurity Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 150000002430 hydrocarbons Chemical group 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 9
- 239000010937 tungsten Substances 0.000 description 9
- 229910021642 ultra pure water Inorganic materials 0.000 description 9
- 239000012498 ultrapure water Substances 0.000 description 9
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 239000007769 metal material Substances 0.000 description 8
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 7
- 230000002411 adverse Effects 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 230000002378 acidificating effect Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 6
- 239000002736 nonionic surfactant Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 5
- 239000000356 contaminant Substances 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 229960003330 pentetic acid Drugs 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 5
- GRUVVLWKPGIYEG-UHFFFAOYSA-N 2-[2-[carboxymethyl-[(2-hydroxyphenyl)methyl]amino]ethyl-[(2-hydroxyphenyl)methyl]amino]acetic acid Chemical compound C=1C=CC=C(O)C=1CN(CC(=O)O)CCN(CC(O)=O)CC1=CC=CC=C1O GRUVVLWKPGIYEG-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 4
- 239000000908 ammonium hydroxide Substances 0.000 description 4
- 239000003945 anionic surfactant Substances 0.000 description 4
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
- 238000011086 high cleaning Methods 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
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- 239000002699 waste material Substances 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
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- ABLZXFCXXLZCGV-UHFFFAOYSA-N phosphonic acid group Chemical group P(O)(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 3
- 150000003376 silicon Chemical class 0.000 description 3
- 238000004506 ultrasonic cleaning Methods 0.000 description 3
- LTSWUFKUZPPYEG-UHFFFAOYSA-N 1-decoxydecane Chemical compound CCCCCCCCCCOCCCCCCCCCC LTSWUFKUZPPYEG-UHFFFAOYSA-N 0.000 description 2
- CMCBDXRRFKYBDG-UHFFFAOYSA-N 1-dodecoxydodecane Chemical compound CCCCCCCCCCCCOCCCCCCCCCCCC CMCBDXRRFKYBDG-UHFFFAOYSA-N 0.000 description 2
- HANWHVWXFQSQGJ-UHFFFAOYSA-N 1-tetradecoxytetradecane Chemical compound CCCCCCCCCCCCCCOCCCCCCCCCCCCCC HANWHVWXFQSQGJ-UHFFFAOYSA-N 0.000 description 2
- CSHOPPGMNYULAD-UHFFFAOYSA-N 1-tridecoxytridecane Chemical compound CCCCCCCCCCCCCOCCCCCCCCCCCCC CSHOPPGMNYULAD-UHFFFAOYSA-N 0.000 description 2
- ZJSCDDIGFJQVAC-UHFFFAOYSA-N 2-[(2-aminoethylamino)methyl]phenol Chemical compound NCCNCC1=CC=CC=C1O ZJSCDDIGFJQVAC-UHFFFAOYSA-N 0.000 description 2
- SFJPGSCMZIUEDJ-UHFFFAOYSA-N 2-[2-[[carboxy-(2-hydroxy-4-methylphenyl)methyl]amino]ethylamino]-2-(2-hydroxy-4-methylphenyl)acetic acid Chemical compound OC1=CC(C)=CC=C1C(C(O)=O)NCCNC(C(O)=O)C1=CC=C(C)C=C1O SFJPGSCMZIUEDJ-UHFFFAOYSA-N 0.000 description 2
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- RAEOEMDZDMCHJA-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-[2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]ethyl]amino]acetic acid Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CCN(CC(O)=O)CC(O)=O)CC(O)=O RAEOEMDZDMCHJA-UHFFFAOYSA-N 0.000 description 1
- KIZQNNOULOCVDM-UHFFFAOYSA-M 2-hydroxyethyl(trimethyl)azanium;hydroxide Chemical compound [OH-].C[N+](C)(C)CCO KIZQNNOULOCVDM-UHFFFAOYSA-M 0.000 description 1
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- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
- KLSJWNVTNUYHDU-UHFFFAOYSA-N Amitrole Chemical compound NC1=NC=NN1 KLSJWNVTNUYHDU-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FCKYPQBAHLOOJQ-UHFFFAOYSA-N Cyclohexane-1,2-diaminetetraacetic acid Chemical compound OC(=O)CN(CC(O)=O)C1CCCCC1N(CC(O)=O)CC(O)=O FCKYPQBAHLOOJQ-UHFFFAOYSA-N 0.000 description 1
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 1
- PDQAZBWRQCGBEV-UHFFFAOYSA-N Ethylenethiourea Chemical compound S=C1NCCN1 PDQAZBWRQCGBEV-UHFFFAOYSA-N 0.000 description 1
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- CWRVKFFCRWGWCS-UHFFFAOYSA-N Pentrazole Chemical compound C1CCCCC2=NN=NN21 CWRVKFFCRWGWCS-UHFFFAOYSA-N 0.000 description 1
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical group CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- ISWQCIVKKSOKNN-UHFFFAOYSA-L Tiron Chemical compound [Na+].[Na+].OC1=CC(S([O-])(=O)=O)=CC(S([O-])(=O)=O)=C1O ISWQCIVKKSOKNN-UHFFFAOYSA-L 0.000 description 1
- ITBPIKUGMIZTJR-UHFFFAOYSA-N [bis(hydroxymethyl)amino]methanol Chemical compound OCN(CO)CO ITBPIKUGMIZTJR-UHFFFAOYSA-N 0.000 description 1
- LBZXFVVTQURNLY-UHFFFAOYSA-N acetic acid nitrous acid Chemical compound C(C)(=O)O.C(C)(=O)O.C(C)(=O)O.N(=O)O LBZXFVVTQURNLY-UHFFFAOYSA-N 0.000 description 1
- RUSUZAGBORAKPY-UHFFFAOYSA-N acetic acid;n'-[2-(2-aminoethylamino)ethyl]ethane-1,2-diamine Chemical compound CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.CC(O)=O.NCCNCCNCCN RUSUZAGBORAKPY-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- 150000008051 alkyl sulfates Chemical class 0.000 description 1
- 125000005233 alkylalcohol group Chemical group 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 150000001414 amino alcohols Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000005441 aurora Substances 0.000 description 1
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- PVEOYINWKBTPIZ-UHFFFAOYSA-N but-3-enoic acid Chemical group OC(=O)CC=C PVEOYINWKBTPIZ-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229940028820 didecyl ether Drugs 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 229910000043 hydrogen iodide Inorganic materials 0.000 description 1
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000004715 keto acids Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- PJUIMOJAAPLTRJ-UHFFFAOYSA-N monothioglycerol Chemical compound OCC(O)CS PJUIMOJAAPLTRJ-UHFFFAOYSA-N 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 231100000957 no side effect Toxicity 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229960003540 oxyquinoline Drugs 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- IUGYQRQAERSCNH-UHFFFAOYSA-N pivalic acid Chemical compound CC(C)(C)C(O)=O IUGYQRQAERSCNH-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010129 solution processing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 1
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 1
- QEMXHQIAXOOASZ-UHFFFAOYSA-N tetramethylammonium Chemical compound C[N+](C)(C)C QEMXHQIAXOOASZ-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229940035024 thioglycerol Drugs 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- GRNRCQKEBXQLAA-UHFFFAOYSA-M triethyl(2-hydroxyethyl)azanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CCO GRNRCQKEBXQLAA-UHFFFAOYSA-M 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/042—Acids
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
-
- C11D2111/22—
Definitions
- the present invention relates to a cleaning liquid and a cleaning method for a substrate for a semiconductor device, and is used for cleaning a substrate surface of a semiconductor, a glass, a metal, a ceramic, a resin, a magnetic material, a superconductor, etc., in which metal contamination and particle contamination pose a problem.
- cleaning liquid More specifically, the present invention relates to a cleaning liquid for cleaning a semiconductor device substrate surface in a process for manufacturing a semiconductor device substrate such as a semiconductor element or a display device, which requires a highly clean substrate surface.
- the cleaning solution and the cleaning method of the present invention are preferably used for cleaning a semiconductor material such as silicon, an insulating material such as silicon nitride, silicon oxide, glass, a low dielectric constant (Low_k) material, a transition metal or a transition metal compound, or the like.
- a semiconductor material such as silicon
- an insulating material such as silicon nitride, silicon oxide, glass
- a low dielectric constant (Low_k) material a transition metal or a transition metal compound, or the like.
- Removal of organic and metal contamination such as silica particles, alumina particles, fine particles (particles) such as organic particles, resist residue, etc.
- Flat panel displays such as TFT LCD, microprocessor, Memory
- a semiconductor device such as a CCD, silicon, Sani ⁇ silicon (S i 0 2), sub-micron dimensions or quarter micron on the surface of the substrate such as a glass Is used to form patterns and thin films. Therefore, in each of these manufacturing steps, it is extremely important to remove even a small amount of contamination on the substrate surface and to highly clean the substrate surface. It is difficult to remove all of the contamination, especially particle contamination and metal contamination, which are minute contaminations. However, since such contamination lowers the electrical characteristics and yield of the semiconductor device, it is necessary to remove such contamination as much as possible before bringing it to the next step. To remove such contamination, cleaning of the substrate surface with a cleaning liquid is generally performed.
- an alkaline aqueous solution is known to be effective as a cleaning liquid used for removing particle contamination.
- an aqueous ammonia solution, an aqueous potassium hydroxide solution, or an aqueous hydroxide solution is used for cleaning the surface of a semiconductor device substrate.
- An alkaline aqueous solution such as an aqueous solution of tetramethylammonium is used, and cleaning with a cleaning solution containing ammonia, hydrogen peroxide, and water (referred to as “SC_1 cleaning solution” or “APM cleaning solution”) (“SC”).
- SC_1 cleaning solution or “APM cleaning solution”
- SC cleaning solution containing ammonia, hydrogen peroxide, and water
- an acidic cleaning solution is also useful in addition to the above alkaline cleaning solution.
- acidic cleaning solutions are effective for removing metal contamination on the substrate surface, but are not suitable for removing particle contamination.
- acid cleaning solutions have various surfactants for the purpose of improving the removal of particle contamination. It has been proposed to add agents. For example, it has been proposed to clean silicon wafers using a specific surfactant and hydrofluoric acid (Japanese Patent Application Laid-Open No. Hei 7-216392).
- wiring (hereinafter simply referred to as “wiring”) connecting small semiconductor elements in semiconductor devices, and electrodes (hereinafter simply referred to as “wiring”) in semiconductor devices.
- New metal materials such as copper (Cu) and tungsten (W), are being introduced as metal materials used for electrodes.
- Cu copper
- W tungsten
- Cu which has a lower resistance than the conventionally used aluminum alloy (A 1), is being adopted as a wiring material.
- Another novel material is an interlayer insulating film between semiconductor elements having a laminated structure.
- this interlayer insulating film a low dielectric constant film using a film made of an organic polymer material or an inorganic polymer material having a lower dielectric constant than the conventionally used SiO 2 film is being adopted.
- This interlayer insulating film is exposed on the substrate together with the wiring during a substrate cleaning step (hereinafter, sometimes referred to as “post-processing”) performed after the metal wiring is formed on the surface of the semiconductor device during the manufacturing process of the semiconductor device. are doing.
- post-processing a substrate cleaning step
- tungsten is being introduced into the electrode as an electrode material having a low resistance and advantageous for fine processing.
- the electrodes are usually exposed on the surface of the substrate during the step of cleaning the substrate before forming the metal wiring (hereinafter sometimes referred to as “pre-process”).
- pre-process the step of cleaning the substrate before forming the metal wiring
- the A1 wiring is easily affected by ultrapure water or organic solvents, because it is weak to strong acids and strong metals and is less affected by metal contamination than the previous process. Only a clean wash was performed.
- Cu was used instead of A1
- C u is one of pollutants disliked most Te convex in S i, fast diffusion rate of C u in oxide film (S i 0 2 film) in the semiconductor element surface, the adverse effects of Had a problem of far exceeding A1.
- the wiring is formed by applying Cu plating to the insulating film in which the groove has been dug in advance (to form the Cu wiring), and then unnecessary portions are formed by CMP (C hemica 1 Mechanical Polishing), etc., the wiring must be formed by the so-called damascene method.
- Surfactant precipitates as oil droplets in the cleaning solution at room temperature or when heated.- Does not cause turbidity, does not cause deterioration in cleaning performance, or causes oil droplets to remain on the substrate surface. .
- the surfactant is a substance that does not adversely affect the natural environment, and the washing waste liquid can be properly treated.
- anionic surfactants generally have no cloud point, so they have a high cleaning effect. It is possible to use the cleaning solution at a high temperature (for example, 80 ° C or higher) in anticipation of the above. However, since the foaming property is high, the operability in the cleaning device may be adversely affected.
- nonionic surfactants have high cleaning performance and low foaming power, but generally have a low cloud point. Therefore, when a high cleaning effect is expected and cleaning is performed at a high cleaning liquid temperature, there is a problem that the surfactant appears as oil droplets in the cleaning liquid and remains on the substrate. Disclosure of the invention
- the present inventors have intensively studied a substrate cleaning solution for a semiconductor device using a surfactant with respect to the above-mentioned problems.
- surfactants used in cleaning liquids especially ethylene oxide-type surfactants, which are nonionic surfactants.
- the ethylene oxide surfactant has a hydrocarbon group and a polyoxyethylene group in the same molecular structure.
- the present inventors have found that, in the ethylene oxide surfactant having such a structure, the ratio (m) between the number of carbon atoms (m) contained in the hydrocarbon group and the number (n) of the oxishylene group in the polyoxyethylene group is determined. / n) is 1 to 1.5, the number of carbon atoms (m) is 9 or more, and the number of oxyethylene groups (n) in the polyoxyethylene group is 7 or more.
- ethylene oxide surfactants within this specific range are solid and have low solubility in water at room temperature and atmospheric pressure. Therefore, such an ethylene oxide type surfactant has a low handling property in an industrial production process and has been avoided from being used.
- a semiconductor device substrate cleaning liquid containing an alkali or organic acid prepared by heating and melting an ethylene oxide type surfactant within a specific range and dissolving it in water is unexpectedly substantially produced. Demonstrated good cleaning performance even without containing hydrogen peroxide. In particular, cleaning properties against fine particle contamination (particle size of 0.1 m order), which cannot be predicted from general cleaning effects Particle removal).
- the above-mentioned cleaning solution for semiconductor device substrates is hydrophobic and easily repels the aqueous cleaning solution, and exhibits a sufficient wettability even on the surface of a low dielectric constant film having low particle removal properties, and has an excellent cleaning effect. did.
- the present inventors have found these facts and completed the present invention.
- the gist of the present invention resides in a cleaning liquid for a semiconductor device substrate and a cleaning method using the cleaning liquid, characterized by containing at least the following components (A), (B) and (C). .
- Component (A) It has a hydrocarbon group which may have a substituent (excluding a phenyl group) and a polyoxyethylene group, and has the number of carbon atoms (m) in the hydrocarbon group and the polyoxyethylene group.
- An ethylene oxide-type surfactant having a ratio (m / n) of the number of oxyshethylene groups (n) of 1 to 1.5, the number of carbon atoms (m) of 9 or more, and the number of oxyethylene groups (n) of 7 or more.
- Component (C) alkali or organic acid
- the cleaning solution of the present invention contains at least a specific surfactant as the component (A), a surfactant as the component (B), and an alkali or organic acid as the component (C).
- the surfactant used as the component (A) has a hydrocarbon group which may have a substituent (excluding a phenyl group) and a polyoxyethylene group,
- the ratio (m / n) of the number of carbon atoms (m) in the carbon group to the number of oxyethylene groups (n) in the polyoxyethylene group is 1 to 1.5, the number of carbon atoms (m) is 9 or more, and the number of oxyethylene groups
- the ratio (m / n) is preferably between 1 and 1.4. When the number of carbon atoms (m) is less than 9, particle removability is reduced even when the (m / n) ratio is within the above-mentioned optimum range.
- the carbon number (m) is preferably 9 to 16, more preferably 10 to 14.
- the hydrocarbon group constituting component (A) has a hydrocarbon group as a substituent, the total number of carbon atoms in the main chain hydrocarbon group and the number of carbon atoms in the substituent hydrocarbon group is m And
- (n) is preferably 7 to 16, more preferably 7 to 14.
- ethylene oxide surfactant specified in the present invention, both the wettability of the cleaning liquid and the removability of particles are improved.
- examples of the above-mentioned ethylene oxide surfactant include polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene alkylamine, and polyoxyethylene alkyl ether sulfate.
- polyoxyethylene alkyl ether represented by the following general formula (II) is preferable from the viewpoint of the ability to remove particle contamination and the ability to prevent redeposition.
- R 2 represents a hydroxyl group, an amino group, an alkoxy group, or an alkyl group optionally substituted with halogen, the number of carbon atoms (m) contained in the alkyl group is 9 or more, and (n) is 7 Represents the above numbers.
- polyoxyethylene (n 8)
- a plurality of ethylene oxide type surfactants having different (m) and (n) may be used in an optional ratio within the scope of the present invention.
- the average value of (mZn) for all surfactants is 1 to 1.5
- the average value of (m) is 9 or more
- the average value of (n) is 7 or more. If the conditions are met, (m) is less than 9 or (m) is less than 7, even if (m / n) is less than 1.0 or more than 1.5 in each individual surfactant. There may be.
- the content of the component (A) in the cleaning liquid usually 0001-1 wt%, the good Mashiku 0.0003 to 0.5 wt 0/0, more preferably 0.001 to 0, 1 by weight 0/6 Particularly preferably, it is 0.001 to 0.05% by weight. If the concentration of component (A) is too low, If the particle contamination removal performance is not sufficient and the concentration of the component (A) is too high, there is no change in the particle contamination removal performance, bubbling becomes remarkable, making the cleaning process unsuitable, and The load when biodegrading is increased.
- the component (A) may contain metal impurities such as Na, K, and Fe in an amount of about 1 to several thousand ppm in a commercially available form.
- component (A) is a source of metal contamination. Therefore, the surfactant used as the component (A) is preferably used after being purified.
- the content of each metal impurity is usually 10 ppm or less, preferably 1 ppm or less, more preferably 0.1 ppm or less.
- a purification method for example, a method in which a surfactant is dissolved in water and then passed through an ion exchange resin to cause the resin to capture metal impurities is preferable.
- the cleaning liquid of the present invention among the metal impurities in the cleaning liquid, at least each of Na, Mg, A, K, Ca, Fe, Cu, Pb, and Zn has a content of 20%. It is preferably not more than 5 ppb, particularly preferably not more than 0.1 ppb.
- a surfactant other than the component (A) may be used as long as the effects of the present invention are not impaired.
- the surfactant other than the component (A) may be any of a cationic surfactant, an anionic surfactant and a nonionic surfactant.
- anionic surfactants and nonionic surfactants include alkylbenzenesulfonic acids having 8 to 12 carbon atoms and Examples thereof include salts, alkylmethyltauric acid having 8 to 12 carbon atoms and salts thereof, and alkyl sulfates having 8 to 12 carbon atoms and salts thereof.
- the nonionic surfactant include a surfactant composed of only polyoxyalkylene.
- water is used as the component (B).
- deionized water preferably ultrapure water
- electrolytic water obtained by electrolysis of water, hydrogen water in which hydrogen gas is dissolved in water, and the like can be used.
- an alkali or organic acid is used as the component (C). That is, the cleaning liquid of the present invention is an alkaline cleaning liquid or an acidic cleaning liquid.
- alkali used in the present invention is not particularly limited, but typical alkalis include hydroxylamine ammonium (aqueous ammonia solution) and organic alkalis.
- organic alkali include amines such as hydroxylamine, quaternary ammonium, amine, and amino alcohol.
- a hydroxyl 4th grade ammonium Hydroxyl group, alkoxy group, alkyl group having 1 to 4 carbon atoms which may be substituted by halogen or carbon number:!
- Preferred are those having from 4 to 4 hydroxyalkyl groups, and all of these substituents may be the same or different.
- alkyl group examples include lower alkyl groups having 1 to 4 carbon atoms such as a methyl group, an ethyl group, a propyl group, and a butyl group.
- hydroxyalkyl group examples include a hydroxymethyl group and a hydroxyethyl group.
- lower hydroxyalkyl groups having 1 to 4 carbon atoms such as a hydroxy group, a hydroxypropyl group and a hydroxybutyl group.
- quaternary ammonium hydroxide having the above substituent examples include tetramethylammonium hydroxide (TMAH), tetraethylammonium hydroxide, and trimethyl (hydroxyethyl) ammonium hydroxide. (Commonly known as choline) and triethyl (hydroxyethyl) ammonium hydroxide.
- TMAH tetramethylammonium hydroxide
- tetraethylammonium hydroxide Trimethyl (hydroxyethyl) ammonium hydroxide.
- choline choline
- examples of the amines examples include ethylenediamine, monoethanolamine, and trimethanolamine.
- alkalis ammonium hydroxide, tetramethylammonium hydroxide (TMAH), trimethyl (hydroxymethyl) are used for reasons such as cleaning effect, little metal residue, economy, and stability of cleaning solution.
- TMAH tetramethylammonium hydroxide
- Chill ammonium hydroxide (commonly known as choline) is preferred.
- These alkalis may be used alone or two or more of them may be used in any ratio.
- the concentration of the alkaline solution in the cleaning solution may be appropriately selected, but is preferably a concentration at which the pH of the cleaning solution becomes 9 or more alkaline. If the alkali concentration is too low and the pH is not high, the effect of removing contamination, which is the object of the present invention, may not be obtained. On the other hand, if the pH is too high, the effect of increasing the pH is not obtained, which is not economically disadvantageous and also increases the risk of damaging the substrate surface by etching. Accordingly, the pH of the alkaline cleaning solution is preferably 9 to 13, more preferably 10 to 12.5, and particularly preferably 10.5 to 12.
- the type of the organic acid used in the present invention is not particularly limited. Or an organic sulfonic acid is preferred.
- organic carboxylic acids include formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, ethylmethylacetic acid, trimethylacetic acid, oxalic acid, succinic acid, malonic acid, citric acid, tartaric acid, and malic acid. No. Among these, one or more selected from the group consisting of acetic acid, propionic acid, oxalic acid, succinic acid, malonic acid, citric acid, tartaric acid, and malic acid are preferable, and from the group of acetic acid, oxalic acid, and citric acid, One or more selected ones are more preferred.
- Acetic acid is used as an etchant material for semiconductor substrates, etc., and is most preferable because it can be obtained at a low price with high purity and low content of metal impurities by distillation operation, and does not generate powder due to water evaporation. .
- Organic sulfonic acids include methanesulfonic acid, ethanesulfonic acid, n-propanesulfonic acid, i-propanesulfonic acid, n-butanesulfonic acid, phenylsulfonic acid and the like. Of these, methanesulfonic acid and / or ethanesulfonic acid are preferred, and methanesulfonic acid is particularly preferred.
- the above organic acids may be used alone, or two or more kinds may be used in an optional ratio.
- the concentration of the organic acid in the washing solution may be appropriately selected, but is preferably a concentration at which the pH of the acidic washing solution is 1 to 5.
- concentration of the organic acid is too low and the pH is not sufficiently low, the effects of removing contamination and preventing adhesion, which are the objects of the present invention, may not be obtained.
- concentration is too high, the effect of lowering the pH is not obtained, which is not only economically disadvantageous but also may cause corrosion of the substrate surface, which is not preferable.
- the pH of the acidic washing solution is preferably 2-3.
- a complexing agent In the cleaning solution of the present invention, it is preferable to add a complexing agent, since an extremely highly cleaned surface with further reduced metal contamination on the substrate surface can be obtained. Any conventionally known complexing agent can be used.
- the type of complexing agent may be selected by comprehensively judging the contamination level on the substrate surface, the type of metal, the required cleanliness level on the substrate surface, the cost of the complexing agent, the chemical stability, etc. For example, the following (1) to (4) are exemplified.
- amino acids such as glycine; iminodiacetic acid, nitrite triacetic acid, ethylenediamine tetraacetic acid [EDTA], trans-1,2-diaminocyclohexanetetraacetic acid [CyDTA], and methylenetriaminepentaacetic acid
- Nitrogen-containing carboxylic acids such as DTPA] and triethylenetetramine hexaacetic acid [TTHA]; ethylenediaminetetrakis (methylenephosphonic acid) [EDTPO], nitrilotris (methylenephosphonic acid) [NTPO], propylenediaminetetra (methylenephosphonic acid) [ PDTMP] and other nitrogen-containing phosphonic acids.
- catechol for example, catechol, resorcinol, phenols such as Tiron, and the force s such a derivative conductor.
- EDDHA Ethylenediaminediorthohydroxyphenylacetic acid
- ethylenediamine diorthohydroxyphenylacetic acid [EDDHA], ethylenediamine monoN, N, monobis [(2-hydroxy-5-methylphenyl) acetic acid] [EDDHMA], ethylenediamine monoN, N, monobis [(2-hydro Aromatic nitrogen-containing carboxylic acids such as [xyl-5-chlorophenyl) acetic acid] [EDDHCA], ethylenediamine-N, N, monobis [(2-hydroxy-5-sulfophenyl) acetic acid] [EDDHSA]; ethylenediamine-N, N Aromatic nitrogen-containing phosphonic acids such as 1,2-bis [(2-hydroxy-15-methylphenyl) phosphonic acid] and ethylenediamine-N, N'-bis [(2-hydroxy-15-phosphophenyl) phosphonic acid].
- EDDHA ethylenediamine diorthohydroxyphenylacetic acid
- EDDHMA ethylenediamine monoN, N, monobis [(2-hydroxy-5-methyl
- amines such as ethylenediamine, 8-quinolinol, and 0-phenanthroline
- carboxylic acids such as acetic acid, oxalic acid, and tartaric acid
- hydrogen halides such as hydrofluoric acid, hydrochloric acid, hydrogen bromide, and hydrogen iodide.
- oxo acids such as phosphoric acid and condensed phosphoric acid, and salts thereof.
- the complexing agent may be in the form of an acid or in the form of a salt such as an ammonium salt.
- nitrogen-containing carboxylic acids such as ethylenediaminetetraacetic acid [EDTA] and diethylenetriaminepentaacetic acid [DTPA] for reasons of cleaning effect and chemical stability; ethylenediaminetetrakis (methylenephosphonic acid)
- Nitrogen-containing phosphonic acids such as [EDTPO:], propylenediaminetetra (methylenephosphonic acid) [PDTMP]; ethylenediaminediorthohydroxyphenylacetic acid [EDDHA] and its derivatives; N, N, —bis (2-hydroxy Benzyl) Ethylenediamine monoN, N, monoacetic acid [HBED] is preferred.
- EPDHA ethylenediamine mono N, N, monobis [(2-hydroxy-5-methylphenyl) acetic acid]
- EDDHMA diethylenetriamine pentaacetic acid
- DTPA ethylenediaminetetraacetic acid
- PTMP propylenediaminetetra (methylenephosphonic acid)
- the above-mentioned complexing agents may be used alone, or two or more kinds may be used in any ratio.
- the concentration of the complexing agent in the cleaning liquid, the type and amount of contaminant metal impurity may be selected arbitrarily according to the required cleanliness levels on the substrate surface force? Usually l ⁇ 10000pp m, preferably 5 to: L000 ppm, more preferably 10 to 200 ppm. If the concentration of the complexing agent is too low, the effect of removing the contamination and prevention of adhesion by the complexing agent cannot be obtained.If the concentration is too high, the effect corresponding to the increase in the concentration cannot be obtained, which is economically disadvantageous. The risk of complexing agents adhering to the substrate surface and remaining after surface treatment increases.
- the complexing agent contains about 1 to several thousand ppm of metal impurities such as Fe AKZn in a commercially available reagent, so that the complexing agent used in the present invention is a metal contamination source. Can be considered. These metals are present in the form of a stable complex with the complexing agent at the beginning, but are released when the complexing agent is decomposed during long-term use as a surface cleaning solution, and the substrate is removed. Attaches to surface. Therefore, it is preferable that the complexing agent used in the present invention be purified and used in advance.
- the content of each of the contained metal impurities is usually 5 ppm or less, preferably 1 ppm or less, more preferably 0.1 ppm or less. Purification methods include, for example, dissolving the complexing agent in an acidic or alkaline solution, removing the insoluble impurities by filtration, neutralizing again to precipitate crystals, and separating the crystals from the liquid.
- the preferred method is
- the cleaning liquid of the present invention may contain other components in an arbitrary ratio as long as the performance is not impaired.
- Other components include sulfur-containing organic compounds
- R 3 (R is an alkyl group having 1 to 4 carbon atoms), N (ROH) 3 (R is an alkyl group having 1 to 4 carbon atoms), perylene, thioperia, etc.), water-soluble polymer (polyethylene glycol, polypropylene)
- Corrosion inhibitors such as alkyl alcohol compounds (ROH (R is an alkyl group having 1 to 4 carbon atoms)), acids such as sulfuric acid and hydrochloric acid, reducing agents such as hydrazine, hydrogen, argon, nitrogen, etc. Dissolved gas, hydrofluoric acid, ammonium fluoride, BHF, etc. Etching promoters that can be expected to have a removal effect are exemplified.
- oxidizing agents such as hydrogen peroxide, ozone, and oxygen.
- the concentration of hydrogen peroxide in the cleaning solution is usually 0.01 to 5% by weight, preferably 0.1 to 1% by weight.
- wiring / device element electrodes of a semiconductor device made of a metal material which reacts and dissolves with hydrogen peroxide may be exposed on the surface of the substrate to be cleaned.
- a metal material include a transition metal such as Cu and W or a transition metal compound.
- the cleaning liquid used for the cleaning does not substantially contain hydrogen peroxide.
- the cleaning liquid of the present invention shows sufficient cleaning performance without adversely affecting such a metal material even without substantially containing hydrogen peroxide.
- substantially does not contain hydrogen peroxide refers to a material on a substrate to be cleaned, for example, a wiring material such as Cu or W, an electrode material, and a low dielectric constant film.
- a wiring material such as Cu or W
- an electrode material such as an electrode material
- a low dielectric constant film it means that hydrogen peroxide does not cause adverse effects such as corrosion and alteration. In other words, it means that these materials sufficiently function as wiring, electrodes, and the like when used as a semiconductor device.
- hydrogen peroxide is not contained in the cleaning solution of the present invention, and even if it is contained, it is preferable that the content thereof be kept low.
- the content is, for example, 10 ppm or less, preferably 1 ppm, more preferably 10 ppm or less.
- the cleaning liquid of the present invention is used for cleaning the surface of a substrate such as a semiconductor, a glass, a metal, a ceramic, a resin, a magnetic material, and a superconductor, in which metal contamination and particle contamination pose a problem.
- a semiconductor device in the process of manufacturing a substrate for a semiconductor device such as a semiconductor device or a display device that requires a particularly clean substrate surface. It is suitably used for cleaning the surface of a substrate for substrates. Wiring, electrodes and the like may be present on the surface of these substrates.
- Suitable materials for the wiring or electrodes S i, G e, G a
- a s semiconductor material such as; S i 0 2, silicon nitride, glass, a low dielectric constant material, Sani ⁇ A Rumi two ⁇ beam, a transition metal oxide things (Sani ⁇ titanium, tantalum oxide, Sani ⁇ hafnium, zirconium oxide, etc.), (B a, S r ) T i 0 3 (BST), polyimide, an insulating material such as an organic thermosetting resin; W, Examples thereof include metals such as Cu and A1, or alloys thereof, silicides, and nitrides.
- Low-permittivity material is a general term for materials whose relative permittivity is 3.5 or less.
- the dielectric constant of the S i 0 2 is Ru 3.8 to 3.9 Der.
- the cleaning solution of the present invention is suitably used for cleaning a substrate for a semiconductor device having a transition metal or a transition metal compound on the surface.
- the transition metal include W, Cu, Ti, Cr, Co, Zr, Hf, Mo, Ru, Au, Pt, and Ag.
- the transition metal compound these transition metal nitrides, oxides, silicides and the like can be mentioned. Of these, W and / or Cu are preferred.
- the step of cleaning the substrate having tungsten on its surface includes cleaning the surface of the substrate having a gate electrode and silicon when tungsten is used as a gate electrode material. Specifically, a cleaning step after forming a tungsten film on a semiconductor device, in particular, a cleaning step after dry etching of a tungsten film, and a cleaning step after ion implantation into a silicon exposed portion. .
- a cleaning step after forming a tungsten film on a semiconductor device in particular, a cleaning step after dry etching of a tungsten film, and a cleaning step after ion implantation into a silicon exposed portion.
- an ultra-fine (for example, a gate electrode having a width of about 0.15 m) gate electrode is formed of tungsten, which is likely to be broken by ultrasonic cleaning or brush scrub. In this case, it is suitable for cleaning the gate electrode and the substrate surface.
- the step of cleaning the substrate having Cu on the surface includes cleaning the surface of the substrate having Cu wiring and an interlayer insulating film when Cu is used as a wiring material. Specifically, the cleaning process after forming a Cu film on a semiconductor device, The cleaning process is performed after the CMP (Chemical Mechanical Polishing) is performed on the u film, and the cleaning process is performed after forming a hole in the interlayer insulating film on the wiring by dry etching.
- CMP Chemical Mechanical Polishing
- the cleaning liquid of the present invention is also suitably used for cleaning a substrate for a semiconductor device having a low dielectric constant material on the surface as an interlayer insulating film material.
- Low-k materials can be broadly divided into three types: organic polymer materials, inorganic polymer (siloxane-based) materials, and porous (porous) materials.
- organic polymer materials include Polyimide, BCB (Benzocyclobutene), Flare (Honeywell), SiLK (Dow Chemical), etc.
- Inorganic polymer materials include FSG (Fluorinated silicate glass), BLACK DIAMOND (Applied Materials), Aurora (Japan ASM) and the like.
- the cleaning liquid of the present invention is suitably used for cleaning the surface of a semiconductor device substrate regardless of the presence or absence of electrodes and wiring materials on the substrate surface.
- the cleaning liquid of the present invention is suitably used for cleaning a semiconductor device substrate having a hydrophobic property in which the contact angle of water on the substrate surface is 60 ° or more.
- the washing solution of the present invention may be prepared by a conventionally known method.
- constituent components of the cleaning liquid for example, surfactant, hydroxylated ammonium, water, and other components such as a complexing agent as required
- any two or three or more components are previously blended, and thereafter, The remaining components may be mixed together, or all may be mixed at once.
- the semiconductor device substrate cleaning liquid of the present invention can be used for a semiconductor device substrate having a metal material having a low resistance to a chemical solution such as hydrogen peroxide on the surface thereof. Since it does not substantially corrode the new material, it is a cleaning solution that can be used in both the pre-process and post-process and has an excellent cleaning effect.
- another gist of the present invention is that a semiconductor device having at least a semiconductor element electrode or a metal wiring on a surface thereof, characterized by satisfying the following conditions (a), (b) and (c). Exists in substrate cleaning solution.
- metal contaminants amount is 1 0 0 0 ⁇ 5 0 0 0 (X 1 0 1 0 atoms / cm 2) der That In the case where the substrate was cleaned, contamination metal content after washing is less than or equal to 10 (X 10 1Q at 0 ms / cm ⁇ ).
- the above provisions (b) and (c) specify the properties of the cleaning liquid of the present invention, but do not specify the cleaning conditions under which the cleaning liquid of the present invention is used.
- “substantially does not corrode the semiconductor element electrode and the metal wiring” means that the semiconductor element electrode and the metal wiring on the substrate to be cleaned, specifically, for example, W and Cu It does not cause adverse effects such as corrosion and alteration on electrode materials and wiring materials such as, and it means that these materials function sufficiently as electrodes and wiring when used as semiconductor devices.
- the condition (c) is that when the object to be cleaned is a substantially disk-shaped substrate surface, that is, a substantially circular substrate surface, even if the cleaning is performed for a short time, the substrate surface is highly purified regardless of the position of the substrate surface. Means that you can do it.
- the surface of a substantially circular substrate having a radius r and having particles having a particle diameter of 0.1 or more of 80 00 to 100000 (pieces of 0.03 m 2 ) is cleaned for a cleaning time of 't: 0.5 to 1 [minute].
- the remaining particles are reduced to 200 t or less, and the outer circumference is relatively small. Even within a circumference of 0.9 r, including the part, the number of particles is 800 / t or less, which means that the substrate surface can be highly cleaned.
- cleaning liquid for semiconductor device substrates of the present invention means that the semiconductor device substrate is cleaned with a cleaning liquid by a cleaning method as described below.
- the cleaning method is not particularly limited as long as it is a method which can be usually employed when cleaning a substrate for a semiconductor device.
- the method of contacting the cleaning liquid with the substrate is a spin method that rotates the substrate at high speed while flowing the cleaning liquid on the substrate, and the temperature of the cleaning liquid should be in the range of room temperature to 90 ° C. Is preferred.
- the cleaning method of the present invention is performed by a method in which a cleaning liquid is brought into direct contact with a substrate.
- the method of contacting the cleaning liquid with the substrate is as follows: a diff in which the cleaning tank is filled with the cleaning liquid and immersed in the substrate: a spin type in which the substrate is rotated at a high speed while the cleaning liquid flows on the substrate from a nozzle, and the liquid is sprayed on the substrate. And a spray type for washing.
- Devices for performing such cleaning include a batch-type cleaning device for simultaneously cleaning a plurality of substrates contained in a cassette, and a single-wafer-type cleaning device for mounting one substrate on a holder and performing cleaning. is there.
- the washing time is usually 30 seconds to 30 minutes, preferably 1 to 15 minutes for a batch type washing apparatus, and usually 1 second to 15 minutes, preferably 5 seconds to 5 minutes for a single wafer type washing apparatus. 5 minutes. If the cleaning time is too short, the cleaning effect is not sufficient, and if it is too long, the improvement of the cleaning effect is small and the throughput is reduced.
- the cleaning liquid of the present invention can be applied to any of the above methods, it is preferably used for spin-type or spray-type cleaning, since more efficient decontamination can be achieved in a short time. Further, if the present invention is applied to a single-wafer cleaning apparatus in which the reduction of the cleaning time and the amount of the cleaning liquid used are problematic, these problems can be solved, which is preferable.
- the temperature of the cleaning solution is usually room temperature, but for the purpose of improving the cleaning effect, it is preferable to heat the cleaning solution to about 40 to 701 :.
- the silicon is exposed on the surface
- the substrate is subjected to a heat treatment step at a temperature of 300 ° C or more to be thermally decomposed, or is subjected to ozone water treatment. Then, it is preferable to oxidatively decompose the organic matter.
- the cleaning method of the present invention is preferably used in combination with a cleaning method using physical force, for example, mechanical cleaning such as scrub cleaning using a cleaning brush or ultrasonic cleaning.
- a cleaning method using physical force for example, mechanical cleaning such as scrub cleaning using a cleaning brush or ultrasonic cleaning.
- ultrasonic irradiation or brush scrub in combination, since the removability of particle contamination is improved and the cleaning time is shortened.
- a resin brush for cleaning after CMP it is preferable to use.
- the material of the resin brush can be arbitrarily selected, it is preferable to use, for example, PVA (polyvinyl alcohol). Irradiating the substrate with ultrasonic waves having a frequency of 0.5 MHz or more is preferable because the synergistic action with the surfactant significantly improves the removability of particles. Further, before and / or after the cleaning method of the present invention, cleaning with electrolytic ionic water obtained by electrolysis of water or hydrogen water in which hydrogen gas is dissolved in water may be combined. BEST MODE FOR CARRYING OUT THE INVENTION
- Washing method Scrub type washing (washing temperature: room temperature, washing time t: 1 minute)
- Measuring device "LS-5000" manufactured by Hitachi Electronics Engineering (edge cut: 40 mm)
- the number of particles on the substrate surface before washing is 8000 ⁇ ; 100000 [pcs Z 0.03 m 2 ], after washing
- the number of particles is the number within a circle having a radius of 0.6 r, which is the same as the center of the substrate.
- a SiO 2 particle-attached substrate was prepared in the same manner as in Example 1. Then, using the shown to cleaning solution in Table 2, the cleaning time except for using inter 0.5 minutes, in the same manner as in Example 1 were washed S I_ ⁇ 2 particles adhered substrate to obtain a cleaned substrate. Table 2 shows the results.
- the wettability evaluation in Table 2 was performed by the following method. That is, the low dielectric constant film (S i OC: carbon-containing S i 0 2) with a test piece (2 cm square) immersed perpendicularly to each washing liquid shown in Table 2. After 0.5 minute, the test piece was pulled out vertically and evaluated by the ratio of the area with the washing liquid to the total area of the test piece.
- the evaluation criteria were: ⁇ : 80% or more, ⁇ : 50% or more and less than 80%, X: less than 50%.
- Washing method Scrub type washing (washing temperature: room temperature, washing time t: 0.5 minutes)
- Low dielectric constant film the (S i OC carbon containing S i 0 2) with a 8-inch silicon substrate (disk-shaped substrate of radius r is 4 inches), was surface-treated for 1 minute with 0.5 wt% hydrofluoric acid Then, it was immersed in the SiO 2 slurry solution for 10 minutes. The immersed substrate was washed with ultrapure water for 1 minute, and spin-dried with a multi-spinner (“KS SP-201” manufactured by Riki Ijo Co., Ltd.). Thereafter, the number of particles adhering to the substrate surface with a laser surface inspection device (product of Hitachi Electronics Engineering Co., Ltd. "LS- 6600”) was measured, 0. 11 mu m or more S i 0 2 particles above a certain quantity (however, the upper limit Is 100000 pieces).
- KS SP-201 manufactured by Riki Ijo Co., Ltd.
- the above-mentioned substrate having the SiO 2 particles attached thereto was brush-scrubbed with a brush made of PVA by the above-mentioned multi-spinner to remove particles. Washing with a washing solution was performed at room temperature for 0.5 minutes. Thereafter, the substrate was washed with ultrapure water for 1 minute, and then spin-dried to obtain a washed substrate. Table 3 shows the results.
- Washing method Scrub type washing (washing temperature: room temperature, washing time t: 0.5 min)
- Measuring device “LS-6600” manufactured by Hitachi Electronics Engineering (edge cut: 10 mm)
- the number of particles on the substrate surface before cleaning is 20000 to 100000 [pieces / 0.03 m 2 ].
- the number of particles after cleaning is the number within a circle having a radius of 0.9 r and having the same center as the substrate.
- a SiO 2 particle-attached substrate was prepared in the same manner as in Example 1. Then, using the shown to the cleaning solution in Table 4, the cleaning time except for using inter 0.5 minutes, in the same manner as in Example 1 were washed S i 0 2 particles adhered substrate to obtain a cleaned substrate. Table 4 shows the results.
- Washing method Scrub type washing (washing temperature: room temperature, washing time t: 0.5 minutes)
- Measuring device “LS-5000” manufactured by Hitachi Electronics Engineering (edge cut: 40 mm)
- the number of particles on the substrate surface before cleaning is 8000 to 100000 [pcs Z 0.03 m 2 ].
- the number of one ticicle is the number within a circle having a radius of 0.6 r and the same center as the substrate.
- a 4-inch silicon substrate (disc-shaped substrate with a radius of r s and 2-inch) with a thermal oxide film with a thickness of about 100 nm on the substrate surface is exposed to the air for 3 hours to attach airborne substances.
- the substrate had 10,000 or more particles with a particle size of 0.2 / m or more (the upper limit was 100,000).
- the substrate was immersed for 10 minutes in each of the cleaning liquids shown in Table 3 controlled at a temperature of 50 ° C., washed with running running pure water for 10 minutes, and dried with a spin drier. Table 5 shows the measurement results of the number of particles remaining on the substrate after the cleaning process.
- Example 13 as a cleaning solution, 29 weight 0/0 hydroxide Anmoniumu solution, 50 wt% aqueous hydrogen peroxide, ultrapure water volume ratio of 1: 4 was mixed at 20 to prepare solution (APM cleaning liquid ) Was evaluated in the same manner as in Example 13 except that) was used. Table 5 shows the results.
- the cleaning liquid of Comparative Example 11 has a relatively small number of adhered particles after cleaning.However, the cleaning liquid contains hydrogen peroxide, so it cannot be applied to new materials in the future and will not be usable in the future. .
- APM 2 9 weight 0/0 ammonia ice, 3 0 wt 0/0 hydrogen peroxide and pure water volume ratio of 1: 2: a solution obtained by mixing at 4 0
- washing temperature 50 ° C, washing time t: 10 minutes (edge cut: 10 mm)
- a 4-inch silicon substrate with a natural oxide film (a disc-shaped substrate with a radius r of 2 inches) was immersed in a 0.5% by weight aqueous HF solution for 5 minutes to obtain a substrate from which the surface oxide film had been removed.
- the number of particles having a particle size of 0.2 ⁇ m or more remaining on the substrate after the cleaning treatment was measured using a substrate surface inspection device (“LS-5000” manufactured by Hitachi Electronics Engineering Co., Ltd.). Table 6 shows the results.
- a 4-inch silicon substrate (disk-shaped substrate with a radius r of 2 inches) was prepared by removing the surface native oxide film by immersion treatment in a 0.5% by weight HF aqueous solution for 5 minutes. This was immersed in a cleaning solution described in Table 5 for each temperature controlled for a predetermined time, washed with running running pure water for 5 minutes, and dried with a spin drier. Immediately after the substrate was dried, Rms (nm), which is the standard deviation of the Z-axis displacement of the substrate surface, was measured with an atomic force microscope (Digital & Instruments, NanoScopellla). Table 7 shows the results.
- the surface roughness of the substrate is visually evaluated. The following results were obtained. That is, in the case of Comparative Examples 15 and 16, the number of crater-like irregularities having a diameter of about 1 to 10 mm on the substrate surface and the surface roughening force such as interference fringes over the entire substrate surface were observed. Was not observed.
- a test piece of about 100 nm-thick polycrystalline polysilicon from which a surface oxide film was removed by immersion treatment in a 0.5% by weight HF aqueous solution for 5 minutes was prepared.
- the test piece was immersed in each of the cleaning liquids described in Table 6 at a temperature of 50 ° C. for 10 minutes, washed with running running pure water for 5 minutes, and dried with a nitrogen probe.
- the thickness of the polycrystalline polysilicon was measured with an optical interference type film thickness measuring device (“Nanospec L-6100” manufactured by Nanometrics). The etching rate was calculated from the film thickness measurement before and after the cleaning treatment. Table 8 shows the results.
- PEG 400 manufactured by NOF Corporation: Condensation product of oxytylene, molecular weight 400
- Processing temperature 50 ° C, processing time t: 10 minutes
- the cleaning liquid of the present invention suppresses the etching rate of the substrate surface with respect to a simple aqueous solution, and is used as a substrate cleaning liquid for semiconductor devices. It turns out that it is excellent.
- APM 29 wt% ammonia water, 30 wt% hydrogen peroxide solution and pure water mixed at a volume ratio of 1: 2: 40 Treatment temperature: 0 ° C. Treatment time t: 10 minutes
- a 4-inch silicon substrate (disc-shaped substrate with a radius r of 2 inches) was immersed in an APM cleaning solution containing metal ions (Fe, Cu).
- the APM cleaning liquid, 2 9 weight 0/0 aqueous ammonia, 3 1 wt% aqueous hydrogen peroxide and water volume ratio of 1: 1 were mixed with 5, metal content thereto F e (20 ppb), C It was prepared by adding a metal ion-containing aqueous solution so as to obtain u (1 ppm).
- the immersed silicon substrate was washed with ultrapure water for 10 minutes and dried by blowing nitrogen to obtain a metal-contaminated silicon substrate.
- the analysis of the contaminated metals (Fe, Cu) on the silicon substrate was performed for both the contaminated silicon substrate and the cleaned silicon substrate by the following method.
- the metal on the surface of the substrate is recovered by treating the substrate with an aqueous solution containing 0.1% by weight of hydrofluoric acid and 1% by weight of hydrogen peroxide, and is analyzed by an inductively coupled plasma mass spectrometer (ICP-MS). Measure the amount of metal and convert it to the metal concentration (at oms / cm 2 ) on the substrate surface.
- ICP-MS inductively coupled plasma mass spectrometer
- the above silicon substrate contaminated with metal was cleaned by a dip cleaning method using the cleaning liquid shown in Table 10 at a cleaning liquid temperature of 60 ° C and a cleaning time of 10 minutes. Analysis results of contaminated silicon substrate and residual metal on cleaned silicon substrate surface
- Table 10 shows (F e, Cu).
- Example 21 C 12 H 25 0 (C 2 H 4 O) n H 12 11 1.1 50 TMAH 50 EDDHA 100 5.2 ⁇ 1 Comparative Example 21 TMAH 50 682 139 washing ⁇ (silicon ⁇ er Ha contaminated with metals) 1000- 3000 3000-5000 Cleaning method: Dip cleaning
- the cleaning liquid of the present invention is excellent in removing fine particles (particles) attached to a hydrophobic low dielectric constant film.
- the cleaning liquid of the present invention has better removability even for particles adhering to airborne substances from airborne substances.
- the cleaning solution of the present invention is excellent in that it can be used in both the pre-process and the post-process, even if the cleaning solution is a semiconductor device substrate on the surface of which a material having low resistance to a chemical such as hydrogen peroxide is used. It is clear that this is a cleaning solution having a good cleaning effect.
- a semiconductor material such as silicon, an insulating material such as silicon nitride, silicon oxide, glass, a low dielectric constant material, a transition metal or a transition metal compound, etc. is partially or entirely coated on the surface. Effectively removes fine particles (particles), organic contaminants, and metallic contaminants adhering to the surface of the substrate by cleaning, and can suppress adhesion even when fine particles are mixed in the system. is there. In particular, it improves the wettability of hydrophobic low-dielectric-constant materials that are easy to repel chemicals, and has excellent cleaning properties.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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KR1020047011547A KR100913557B1 (ko) | 2002-01-28 | 2003-01-27 | 반도체 디바이스용 기판의 세정액 및 세정방법 |
US10/899,304 US20050020463A1 (en) | 2002-01-28 | 2004-07-27 | Cleaning solution for cleaning substrate for semiconductor devices and cleaning method using the same |
US11/898,233 US7621281B2 (en) | 2002-01-28 | 2007-09-11 | Cleaning solution for cleaning substrate for semiconductor devices and cleaning method using the same |
Applications Claiming Priority (2)
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JP2002018547 | 2002-01-28 | ||
JP2002-18547 | 2002-01-28 |
Related Child Applications (1)
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US10/899,304 Continuation US20050020463A1 (en) | 2002-01-28 | 2004-07-27 | Cleaning solution for cleaning substrate for semiconductor devices and cleaning method using the same |
Publications (1)
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WO2003065433A1 true WO2003065433A1 (fr) | 2003-08-07 |
Family
ID=27653860
Family Applications (1)
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PCT/JP2003/000714 WO2003065433A1 (fr) | 2002-01-28 | 2003-01-27 | Detergent liquide pour substrat de dispositif semi-conducteur et procede de nettoyage |
Country Status (5)
Country | Link |
---|---|
US (2) | US20050020463A1 (ja) |
KR (1) | KR100913557B1 (ja) |
CN (1) | CN1639846A (ja) |
TW (1) | TWI302950B (ja) |
WO (1) | WO2003065433A1 (ja) |
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- 2003-01-27 WO PCT/JP2003/000714 patent/WO2003065433A1/ja active Application Filing
- 2003-01-27 CN CNA038048027A patent/CN1639846A/zh active Pending
- 2003-01-27 TW TW092101707A patent/TWI302950B/zh not_active IP Right Cessation
-
2004
- 2004-07-27 US US10/899,304 patent/US20050020463A1/en not_active Abandoned
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2007
- 2007-09-11 US US11/898,233 patent/US7621281B2/en not_active Expired - Fee Related
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US7503982B2 (en) | 2003-04-09 | 2009-03-17 | Kanto Jangaku Kabushiki Kaisha | Method for cleaning semiconductor substrate |
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Also Published As
Publication number | Publication date |
---|---|
US20050020463A1 (en) | 2005-01-27 |
TWI302950B (en) | 2008-11-11 |
KR100913557B1 (ko) | 2009-08-21 |
US20080011321A1 (en) | 2008-01-17 |
US7621281B2 (en) | 2009-11-24 |
CN1639846A (zh) | 2005-07-13 |
TW200304962A (en) | 2003-10-16 |
KR20040077805A (ko) | 2004-09-06 |
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