US20150344826A1 - Aqueous cleaning composition containing copper-specific corrosion inhibitor for cleaning inorganic residues on semiconductor substrate - Google Patents
Aqueous cleaning composition containing copper-specific corrosion inhibitor for cleaning inorganic residues on semiconductor substrate Download PDFInfo
- Publication number
- US20150344826A1 US20150344826A1 US14/826,840 US201514826840A US2015344826A1 US 20150344826 A1 US20150344826 A1 US 20150344826A1 US 201514826840 A US201514826840 A US 201514826840A US 2015344826 A1 US2015344826 A1 US 2015344826A1
- Authority
- US
- United States
- Prior art keywords
- fluoride
- acid
- ammonium
- cleaning
- formulations
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 239000000203 mixture Substances 0.000 title claims abstract description 90
- 238000004140 cleaning Methods 0.000 title claims abstract description 31
- 239000004065 semiconductor Substances 0.000 title claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title abstract description 31
- 239000010949 copper Substances 0.000 title abstract description 28
- 229910052802 copper Inorganic materials 0.000 title abstract description 28
- 238000005260 corrosion Methods 0.000 title description 22
- 230000007797 corrosion Effects 0.000 title description 22
- 239000003112 inhibitor Substances 0.000 title description 11
- 239000000758 substrate Substances 0.000 title description 4
- 238000009472 formulation Methods 0.000 claims abstract description 73
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 33
- 150000001412 amines Chemical class 0.000 claims abstract description 30
- 229910052751 metal Inorganic materials 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 28
- 239000002738 chelating agent Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- -1 nitrogen-containing carboxylic acid Chemical class 0.000 claims abstract description 18
- 150000002466 imines Chemical class 0.000 claims abstract description 17
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 29
- 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 claims description 15
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 12
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 12
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 11
- NBZBKCUXIYYUSX-UHFFFAOYSA-N iminodiacetic acid Chemical compound OC(=O)CNCC(O)=O NBZBKCUXIYYUSX-UHFFFAOYSA-N 0.000 claims description 11
- UKODFQOELJFMII-UHFFFAOYSA-N pentamethyldiethylenetriamine Chemical compound CN(C)CCN(C)CCN(C)C UKODFQOELJFMII-UHFFFAOYSA-N 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 9
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 claims description 9
- 125000004209 (C1-C8) alkyl group Chemical group 0.000 claims description 8
- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 claims description 8
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- GIAFURWZWWWBQT-UHFFFAOYSA-N 2-(2-aminoethoxy)ethanol Chemical compound NCCOCCO GIAFURWZWWWBQT-UHFFFAOYSA-N 0.000 claims description 6
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 6
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 6
- VSWDORGPIHIGNW-UHFFFAOYSA-N Pyrrolidine dithiocarbamic acid Chemical compound SC(=S)N1CCCC1 VSWDORGPIHIGNW-UHFFFAOYSA-N 0.000 claims description 6
- LINDOXZENKYESA-UHFFFAOYSA-N TMG Natural products CNC(N)=NC LINDOXZENKYESA-UHFFFAOYSA-N 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 6
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 6
- IKGLACJFEHSFNN-UHFFFAOYSA-N hydron;triethylazanium;trifluoride Chemical compound F.F.F.CCN(CC)CC IKGLACJFEHSFNN-UHFFFAOYSA-N 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- MOVBJUGHBJJKOW-UHFFFAOYSA-N methyl 2-amino-5-methoxybenzoate Chemical compound COC(=O)C1=CC(OC)=CC=C1N MOVBJUGHBJJKOW-UHFFFAOYSA-N 0.000 claims description 6
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 claims description 6
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 6
- 229960002447 thiram Drugs 0.000 claims description 6
- 125000003118 aryl group Chemical group 0.000 claims description 5
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical class [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 125000003342 alkenyl group Chemical group 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 150000004706 metal oxides Chemical group 0.000 claims description 4
- KYVBNYUBXIEUFW-UHFFFAOYSA-N 1,1,3,3-tetramethylguanidine Chemical compound CN(C)C(=N)N(C)C KYVBNYUBXIEUFW-UHFFFAOYSA-N 0.000 claims description 3
- KKFDCBRMNNSAAW-UHFFFAOYSA-N 2-(morpholin-4-yl)ethanol Chemical compound OCCN1CCOCC1 KKFDCBRMNNSAAW-UHFFFAOYSA-N 0.000 claims description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 3
- YSAANLSYLSUVHB-UHFFFAOYSA-N 2-[2-(dimethylamino)ethoxy]ethanol Chemical compound CN(C)CCOCCO YSAANLSYLSUVHB-UHFFFAOYSA-N 0.000 claims description 3
- UIKUBYKUYUSRSM-UHFFFAOYSA-N 3-morpholinopropylamine Chemical compound NCCCN1CCOCC1 UIKUBYKUYUSRSM-UHFFFAOYSA-N 0.000 claims description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 239000004251 Ammonium lactate Substances 0.000 claims description 3
- 239000004471 Glycine Substances 0.000 claims description 3
- WRQNANDWMGAFTP-UHFFFAOYSA-N Methylacetoacetic acid Chemical compound COC(=O)CC(C)=O WRQNANDWMGAFTP-UHFFFAOYSA-N 0.000 claims description 3
- ATWLCPHWYPSRBQ-UHFFFAOYSA-N N-Methylacetoacetamide Chemical compound CNC(=O)CC(C)=O ATWLCPHWYPSRBQ-UHFFFAOYSA-N 0.000 claims description 3
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 claims description 3
- DTQVDTLACAAQTR-UHFFFAOYSA-M Trifluoroacetate Chemical compound [O-]C(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-M 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- GCPWJFKTWGFEHH-UHFFFAOYSA-N acetoacetamide Chemical compound CC(=O)CC(N)=O GCPWJFKTWGFEHH-UHFFFAOYSA-N 0.000 claims description 3
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 claims description 3
- 239000000908 ammonium hydroxide Substances 0.000 claims description 3
- 235000019286 ammonium lactate Nutrition 0.000 claims description 3
- 229940059265 ammonium lactate Drugs 0.000 claims description 3
- RZOBLYBZQXQGFY-HSHFZTNMSA-N azanium;(2r)-2-hydroxypropanoate Chemical compound [NH4+].C[C@@H](O)C([O-])=O RZOBLYBZQXQGFY-HSHFZTNMSA-N 0.000 claims description 3
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 claims description 3
- BEPAFCGSDWSTEL-UHFFFAOYSA-N dimethyl malonate Chemical compound COC(=O)CC(=O)OC BEPAFCGSDWSTEL-UHFFFAOYSA-N 0.000 claims description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 125000000524 functional group Chemical group 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- QAMFBRUWYYMMGJ-UHFFFAOYSA-N hexafluoroacetylacetone Chemical compound FC(F)(F)C(=O)CC(=O)C(F)(F)F QAMFBRUWYYMMGJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004312 hexamethylene tetramine Substances 0.000 claims description 3
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 3
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- BXYVQNNEFZOBOZ-UHFFFAOYSA-N n-[3-(dimethylamino)propyl]-n',n'-dimethylpropane-1,3-diamine Chemical compound CN(C)CCCNCCCN(C)C BXYVQNNEFZOBOZ-UHFFFAOYSA-N 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
- LROATHSBUUYETB-UHFFFAOYSA-M tetramethylazanium;2,2,2-trifluoroacetate Chemical compound C[N+](C)(C)C.[O-]C(=O)C(F)(F)F LROATHSBUUYETB-UHFFFAOYSA-M 0.000 claims description 3
- LTSORXKZGSXNHL-UHFFFAOYSA-M tetramethylazanium;thiobenzate Chemical compound C[N+](C)(C)C.[O-]C(=S)C1=CC=CC=C1 LTSORXKZGSXNHL-UHFFFAOYSA-M 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-O triethanolammonium Chemical compound OCC[NH+](CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-O 0.000 claims description 3
- 125000003917 carbamoyl group Chemical group [H]N([H])C(*)=O 0.000 claims description 2
- 125000001475 halogen functional group Chemical group 0.000 claims description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 2
- 150000005309 metal halides Chemical group 0.000 claims description 2
- 235000012431 wafers Nutrition 0.000 abstract description 22
- 238000004380 ashing Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 9
- 210000002381 plasma Anatomy 0.000 description 9
- 239000000654 additive Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000011109 contamination Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 125000004429 atom Chemical group 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 150000001735 carboxylic acids Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical class [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 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 3
- 125000001931 aliphatic group Chemical group 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 229960001484 edetic acid Drugs 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- YRAJNWYBUCUFBD-UHFFFAOYSA-N 2,2,6,6-tetramethylheptane-3,5-dione Chemical compound CC(C)(C)C(=O)CC(=O)C(C)(C)C YRAJNWYBUCUFBD-UHFFFAOYSA-N 0.000 description 2
- 229910016411 CuxO Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- LDDQLRUQCUTJBB-UHFFFAOYSA-N ammonium fluoride Chemical class [NH4+].[F-] LDDQLRUQCUTJBB-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- JATTVKHMPGUIEA-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]acetic acid;2-[carboxymethyl(2-hydroxyethyl)amino]acetic acid Chemical compound OCCN(CC(O)=O)CC(O)=O.OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O JATTVKHMPGUIEA-UHFFFAOYSA-N 0.000 description 1
- FZZMTSNZRBFGGU-UHFFFAOYSA-N 2-chloro-7-fluoroquinazolin-4-amine Chemical compound FC1=CC=C2C(N)=NC(Cl)=NC2=C1 FZZMTSNZRBFGGU-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- JYXGIOKAKDAARW-UHFFFAOYSA-N N-(2-hydroxyethyl)iminodiacetic acid Chemical compound OCCN(CC(O)=O)CC(O)=O JYXGIOKAKDAARW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000005380 borophosphosilicate glass Substances 0.000 description 1
- 239000006172 buffering agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical group 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- YPEWWOUWRRQBAX-UHFFFAOYSA-N n,n-dimethyl-3-oxobutanamide Chemical compound CN(C)C(=O)CC(C)=O YPEWWOUWRRQBAX-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- VVRQVWSVLMGPRN-UHFFFAOYSA-N oxotungsten Chemical class [W]=O VVRQVWSVLMGPRN-UHFFFAOYSA-N 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- MZLGASXMSKOWSE-UHFFFAOYSA-N tantalum nitride Chemical compound [Ta]#N MZLGASXMSKOWSE-UHFFFAOYSA-N 0.000 description 1
- 150000005622 tetraalkylammonium hydroxides Chemical class 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910001930 tungsten oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C11D3/26—Organic compounds containing nitrogen
-
- 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
-
- 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
- C11D3/26—Organic compounds containing nitrogen
- C11D3/30—Amines; Substituted amines ; Quaternized amines
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K13/00—Etching, surface-brightening or pickling compositions
- C09K13/04—Etching, surface-brightening or pickling compositions containing an inorganic acid
- C09K13/08—Etching, surface-brightening or pickling compositions containing an inorganic acid containing a fluorine compound
-
- 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
- C11D11/00—Special methods for preparing compositions containing mixtures of detergents ; Methods for using cleaning compositions
- C11D11/0005—Special cleaning or washing methods
- C11D11/0011—Special cleaning or washing methods characterised by the objects to be cleaned
- C11D11/0023—"Hard" surfaces
- C11D11/0047—Electronic devices, e.g. PCBs or semiconductors
-
- 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
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- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
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- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/34—Organic compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/141—Amines; Quaternary ammonium compounds
- C23F11/142—Hydroxy amines
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/146—Nitrogen-containing compounds containing a multiple nitrogen-to-carbon bond
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/103—Other heavy metals copper or alloys of copper
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/106—Other heavy metals refractory metals
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/42—Stripping or agents therefor
- G03F7/422—Stripping or agents therefor using liquids only
- G03F7/425—Stripping or agents therefor using liquids only containing mineral alkaline compounds; containing organic basic compounds, e.g. quaternary ammonium compounds; containing heterocyclic basic compounds containing nitrogen
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- 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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/0206—Cleaning during device manufacture during, before or after processing of insulating layers
- H01L21/02063—Cleaning during device manufacture during, before or after processing of insulating layers the processing being the formation of vias or contact holes
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- 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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/02068—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers
- H01L21/02071—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers the processing being a delineation, e.g. RIE, of conductive layers
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- 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
- H01L21/02041—Cleaning
- H01L21/02057—Cleaning during device manufacture
- H01L21/02068—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers
- H01L21/02074—Cleaning during device manufacture during, before or after processing of conductive layers, e.g. polysilicon or amorphous silicon layers the processing being a planarization of conductive layers
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- 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
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
- H01L21/3213—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer
- H01L21/32133—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only
- H01L21/32135—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only
- H01L21/32136—Physical or chemical etching of the layers, e.g. to produce a patterned layer from a pre-deposited extensive layer by chemical means only by vapour etching only using plasmas
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- C11D2111/22—
Definitions
- the present invention relates generally to chemical formulations useful in semiconductor manufacturing and particularly to chemical formulations that are utilized to remove residue from wafers following a resist plasma ashing step. More specifically, the present invention relates to cleaning formulations for removal of inorganic residue from semiconductor wafers containing delicate copper interconnecting structures.
- the prior art teaches the utilization of various chemical formulations to remove residues and clean wafers following a resist ashing step.
- Some of these prior art chemical formulations include alkaline compositions containing amines and/or tetraalkyl ammonium hydroxides, water and/or other solvents, and chelating agents.
- Still other formulations are based on acidic to neutral solutions containing ammonium fluoride.
- the various prior art formulations have drawbacks that include unwanted removal of metal or insulator layers and the corrosion of desirable metal layers, particularly copper or copper alloys features.
- Some prior art formulations employ corrosion inhibiting additives to prevent undesirable copper metal corrosion during the cleaning process.
- conventional corrosion-inhibiting additives typically have detrimental effects on the cleaning process because such additives interact with the residue and inhibit dissolution of such residue into the cleaning fluid.
- conventional additives do not easily rinse off the copper surface after completion of the cleaning process. Such additives therefore remain on the surface sought to be cleaned, and result in contamination of the integrated circuits. Contamination of the integrated circuit can adversely increase the electrical resistance of contaminated areas and cause unpredictable conducting failure within the circuit.
- post CMP cleaners for advanced integrated circuit manufacturing such as copper and tungsten interconnect materials
- slurry removal and residue dissolution components that accelerate the physical cleaning process.
- these conventional additives typically have detrimental effects on the metal surface by increasing resistance and corrosion sensitivity.
- the present invention relates generally to chemical formulations useful in semiconductor manufacturing for removing residue from wafers following a resist plasma ashing step.
- the invention relates to a method of removing residue from a wafer following a resist plasma ashing step on such wafer, comprising contacting the wafer with a cleaning formulation, including (i) a fluoride source, (ii) at least one organic amine, (iii) a nitrogen-containing carboxylic acid or an imine, (iv) water, and optionally at least one metal chelating agent.
- a cleaning formulation including (i) a fluoride source, (ii) at least one organic amine, (iii) a nitrogen-containing carboxylic acid or an imine, (iv) water, and optionally at least one metal chelating agent.
- a wafer cleaning formulation including (i) a fluoride source, (ii) at least one organic amine, (iii) a nitrogen-containing carboxylic acid or an imine, (iv) water, and optionally at least one metal chelating agent.
- the invention relates to a semiconductor wafer cleaning formulation for use in post plasma ashing semiconductor fabrication, comprising the following components in the percentage by weight (based on the total weight of the formulation) ranges shown:
- a fluoride source e.g., ammonium fluoride and/or 1-35% derivative(s) thereof organic amine(s) 20-60% a nitrogenous component selected from nitrogen-containing 0.1-40% carboxylic acids and imines water 20-50% metal chelating agent(s) 0-21% TOTAL 100%
- the invention relates to a formulation useful for post chemical mechanical polishing (CMP) cleaning, which is a dilute version of the wafer cleaning formulation outlined hereinabove, wherein the dilute formulation comprises: (i) a fluoride source, (ii) at least one organic amine, (iii) 70% to 98% water, and optionally at least one metal chelating agent and optionally a nitrogen-containing carboxylic acid or an imine.
- CMP chemical mechanical polishing
- Such formulations of the invention effectively remove inorganic residues following a plasma ashing and/or CMP step.
- Such formulations also effectively remove metal halide and metal oxide residues following plasma ashing, and effectively remove slurry particles of aluminum oxides and other oxides remaining after CMP (chemical mechanical polishing).
- formulations of the present invention provide better stripping performance with less corrosivity than formulations containing either ammonium fluoride or amines.
- Formulations in accordance with the invention also provide better stripping performance at lower processing temperatures than conventional amine-containing formulations.
- the formulations of the invention utilize a chelating agent, which may be a single-component chelating agent or a multicomponent-chelating agent, to prevent metal corrosion and increase stripping effectiveness.
- a chelating agent which may be a single-component chelating agent or a multicomponent-chelating agent, to prevent metal corrosion and increase stripping effectiveness.
- FIG. 1 is a schematic representation of a copper-specific corrosion inhibitor useful in the broad practice of the present invention, which forms a protective layer on the copper metal to prevent corrosion;
- FIG. 2 is a schematic representation of the copper-specific corrosion inhibitor being rinsed away from the copper surface by deionized water
- FIG. 3 depicts cleaning components of the present invention interacting with a surface
- FIG. 4 illustrates that formulations of the present invention maybe used to remove residues and particles
- FIG. 5 provides a SEM representing results obtained from an immersion process
- FIG. 6 illustrates the material etch rate on interconnect materials.
- the formulations of the present invention are suitable for stripping inorganic wafer residues deriving from high-density plasma etching followed by ashing with oxygen-containing plasmas. Such formulations, in dilute form, are also suitable for removing slurry particles of aluminum oxides and other oxides remaining after CMP (chemical mechanical polishing).
- the formulations advantageously contain (i) a fluoride source, such as ammonium fluoride and/or derivative(s) of ammonium fluoride, (ii) an amine or mixture of amines, (iii) a nitrogen-containing carboxylic acid or imine, (iv) water, and, optionally and preferably, (v) one or more metal chelating agents.
- a fluoride source such as ammonium fluoride and/or derivative(s) of ammonium fluoride
- an amine or mixture of amines such as an amine or mixture of amines, (iii) a nitrogen-containing carboxylic acid or imine, (iv) water, and, optionally and preferably, (v) one or more metal chelating agents.
- a fluoride source refers to a compound or a mixture of compounds that in the aqueous cleaning formulation provides fluorine anions.
- the preferred formulations for post etch removal include the following components in the percentage by weight (based on the total weight of the formulation) ranges shown:
- fluoride source 1-35% organic amine(s) 20-60% a nitrogenous component selected from nitrogen containing 0.1-40% carboxylic acids and imines water 20-50% metal chelating agent(s) 0-21% TOTAL 100%
- the preferred formulations for post CMP cleaning include the following components in the percentage by weight (based on the total weight of the formulation) ranges shown:
- fluoride source 0.1%-5% organic amine(s) 1%-15% a nitrogenous component selected from nitrogen containing 0-10% carboxylic acids and imines water 70%-98% metal chelating agent(s) 0-5% TOTAL 100%
- the components of the formulation as described above can be of any suitable type or species, as will be appreciated by those of ordinary skill in the art. Specific illustrative and preferred formulation components for each of the ingredients of the formulation are described below.
- Particularly preferred amines include one or more of the following:
- Fluoride sources useful in the present invention include any combination of ammonia gas or ammonium hydroxide and hydrogen fluoride gas or hydrofluoric acid.
- Specific preferred fluoride sources include, but are not limited to one or more of the following:
- Specific preferred nitrogen-containing carboxylic acids and imines include one or more of the following:
- Specific preferred metal chelating agents include:
- ammonium fluoride or a substituted fluoride source as described above, with an amine (other than an amine present as a surfactant in an amount of 1% or less) provides better stripping performance with less corrosivity than formulations containing either ammonium fluoride or amines alone.
- the resulting alkaline solutions are effective at lower processing temperatures (e.g., 21°-40° C.) than conventional amine-containing formulations.
- the nitrogen-containing carboxylic acids or imines provide functional groups that are specifically attracted to free copper atoms.
- the copper-specific corrosion inhibiting-agent C which contacts the copper surface during the residue-removal process, will attach to the copper surface and form a protective layer to prevent the copper surface being corroded by cleaning agents A + and X ⁇ .
- such copper-specific corrosion-inhibiting agent C can be easily rinsed off by deionized water or other solutions and therefore leaves very little contamination on the copper surface after the cleaning operation.
- 1,3-dicarbonyl compounds as chelating agents and to prevent metal corrosion is a preferred feature of the inventive formulations, to increase their effectiveness.
- amines are present in amounts of 1% or less of the formulation as surfactants, or otherwise are not utilized as formulation ingredients at all. Additionally, the prior art formulations are acidic (pH ⁇ 7) in character. In preferred formulations of the present invention, the amines are present as major components of the formulation, are highly effective in stripping action, and yield formulations of a basic pH character (pH>7).
- the formulations of the invention may include a wide variety of organic amines, substituted ammonium fluorides, and nitrogen-containing carboxylic acids, other than those specifically exemplified.
- Particular substituted ammonium fluorides of suitable character include those of the general formula, R 1 R 2 R 3 R 4 NF in which each of the respective R species is independently selected from hydrogen and aliphatic groups.
- Suitable nitrogen-containing carboxylic acids include those of the general structure COOH—CH 2 —NRR′, wherein R and R′ are each independently selected from the group consisting of hydrogen, alkyl, aryl, and carboxylic acid moieties.
- Suitable metal chelating agents include 1,3-dicarbonyl compounds of the general structure X—CHR—Y.
- R is either a hydrogen atom or an aliphatic group, e.g., C 1 -C 8 alkyl, aryl, alkenyl, etc.
- X and Y may be the same as or different from one another, and are functional groups containing multiply-bonded moieties with electron-withdrawing properties, as for example CONH 2 , CONHR′, CN, NO 2 , SOR′, or SO 2 Z, in which R′ represents a C 1 -C 8 alkyl group and Z represents another atom or group, e.g., hydrogen, halo or C 1 -C 8 alkyl.
- chelating agent species useful in the compositions of the invention include amine trifluoroacetates of the general formula, R 1 R 2 R 3 R 4 N + ⁇ O 2 CCF 3 in which each of the R groups is independently selected from hydrogen and aliphatic groups, e.g., C 1 -C 8 alkyl, aryl, alkenyl, etc.
- formulations of the invention optionally may also include such components as surfactants, stabilizers, corrosion inhibitors, buffering agents, and co-solvents, as useful or desired in a given end use application of formulations of the invention.
- Formulations in accordance with the present invention are particularly useful on wafers that have been etched with chlorine- or fluorine-containing plasmas, followed by oxygen plasma ashing.
- the residues generated by this type of processing typically contain metal oxides. Such residues are often difficult to dissolve completely without causing corrosion of metal and titanium nitride features required for effective device performance. Also, metal oxide and silicon oxide slurry particles remaining after CMP will also be effectively removed by formulations in accordance with the present invention.
- Copper-specific corrosion inhibitors including either hydrogen-containing carboxylic acids or imines were tested in two different types of alkaline cleaning formulations, with the following components and characteristics.
- the copper etch rate was determined by a standard four-point probe technique. Addition of corrosion inhibitors in accordance with the present invention significantly slowed down the copper etch rate, as shown by the following table, and effectively prevented undesirable corrosion during the cleaning process:
- the present invention employs dilute alkaline fluoride in compositions for post CMP cleaning of silicon oxide or aluminum oxide particles from metallic surfaces such as copper or tungsten.
- FIG. 3 depicts how the cleaning components of the present invention interact with the surface.
- FIG. 3 depicts that Alkaline Fluoride 30 and chelating agents 32 dissolving inorganic oxide residues 34 after a CMP process.
- FIG. 4 illustrates that the formulations taught by the present invention may be used to remove residues 40 and particles 42 for a copper surface 44 .
- particles 42 and residues 40 adhere to metal surface 44 as well as dielectric surface 46 .
- Particles 42 and residues 40 may remain following a CMP process.
- the chemical solutions of the present invention degrade the attractive forces between the residue and the surface as well as dissolve copper and tungsten oxides and oxy-halides.
- Formulations that have been found to be effective in cleaning residue and slurry particles from metal surfaces may have a pH value in a range for from about 3 to 11, but typically have pH values between about 7 and about 9.
- These formulations generally are aqueous solutions that comprise a fluoride source, an organic amine, and metal chelating agent.
- the individual constituents typically constitute a fluoride source and/or a derivative thereof as about 0.1 to about 5.0% of the formulation, wherein the fluoride may be one of many such fluoride sources known to those skilled in the art including one or more of:
- the organic amine or mixture of two amines typically comprises between about 1% and about 15% of the formulation of the present invention, wherein the organic amine can be one of many such organic amines known to those skilled in the art including:
- the nitrogenous component of the mixture typically comprises 0 to about 10% of the mixture.
- the nitrogenous component may be one of many such nitrogenous component sources known to those skilled in the art including one or more of:
- the metal chelating agent or mixture of chelating agents typically comprises about 0 to about 5.0% of the formulation.
- Typical metal chelating agent may be one of many such metal chelating agents known to those skilled in the art including:
- FIG. 5 depicts a SEM representing the results obtained with a standard immersion process. Specifically FIG. 5 depicts Tungsten plugs after alumina slurry CMP and immersion in formula c for 10 min at 30° C. Furthermore, selectivity to exposed materials may be illustrated by etch rate data. FIG. 6 and table 3 illustrate the material etch rate on interconnect materials including an electroplated copper film.
Abstract
A semiconductor wafer cleaning formulation, including 1-35% wt. fluoride source, 20-60% wt. organic amine(s), 0.1-40% wt. nitrogenous component, e.g., a nitrogen-containing carboxylic acid or an imine, 20-50% wt. water, and 0-21% wt. metal chelating agent(s). The formulations are useful to remove residue from wafers following a resist plasma ashing step, such as inorganic residue from semiconductor wafers containing delicate copper interconnecting structures.
Description
- This application claims the benefit of U.S. patent application Ser. No. 09/818,073 filed Mar. 3, 2001 which in turn claims priority of U.S. patent application Ser. No. 08/924,021 filed on Aug. 29, 1997, which in turn claims the priority of U.S. Provisional Patent Application 60/044,824 filed Apr. 25, 1997 and U.S. Provisional Patent Application 60/034,194 filed Jan. 9, 1997. Additionally, this application claims priority to and repeats a substantial portion of prior U.S. patent application Ser. No. 09/818,073 filed Mar. 3, 2001 and U.S. patent application Ser. No. 08/924,021 filed on Aug. 29, 1997. Since this application names an inventor named in the prior application, the application constitutes a continuation in part of the prior application. This application incorporates by reference prior U.S. patent application Ser. No. 09/818,073 filed Mar. 3, 2001, U.S. patent application Ser. No. 08/924,021 filed on Aug. 29, 1997, U.S. Provisional Patent Application 60/044,824 filed on Apr. 25, 1997 and U.S. Provisional Patent Application 60/034,194 filed on Jan. 9, 1997.
- The present invention relates generally to chemical formulations useful in semiconductor manufacturing and particularly to chemical formulations that are utilized to remove residue from wafers following a resist plasma ashing step. More specifically, the present invention relates to cleaning formulations for removal of inorganic residue from semiconductor wafers containing delicate copper interconnecting structures.
- The prior art teaches the utilization of various chemical formulations to remove residues and clean wafers following a resist ashing step. Some of these prior art chemical formulations include alkaline compositions containing amines and/or tetraalkyl ammonium hydroxides, water and/or other solvents, and chelating agents. Still other formulations are based on acidic to neutral solutions containing ammonium fluoride.
- The various prior art formulations have drawbacks that include unwanted removal of metal or insulator layers and the corrosion of desirable metal layers, particularly copper or copper alloys features. Some prior art formulations employ corrosion inhibiting additives to prevent undesirable copper metal corrosion during the cleaning process. However, conventional corrosion-inhibiting additives typically have detrimental effects on the cleaning process because such additives interact with the residue and inhibit dissolution of such residue into the cleaning fluid. Moreover, conventional additives do not easily rinse off the copper surface after completion of the cleaning process. Such additives therefore remain on the surface sought to be cleaned, and result in contamination of the integrated circuits. Contamination of the integrated circuit can adversely increase the electrical resistance of contaminated areas and cause unpredictable conducting failure within the circuit.
- The formulation of post CMP cleaners for advanced integrated circuit manufacturing such as copper and tungsten interconnect materials, includes slurry removal and residue dissolution components that accelerate the physical cleaning process. However, these conventional additives typically have detrimental effects on the metal surface by increasing resistance and corrosion sensitivity.
- It is therefore one object of the present invention to provide chemical formulations that effectively remove residue following a resist ashing step, and which do not attack and potentially degrade delicate structures intended to remain on the wafer.
- It is another object of the present invention to replace conventional additives with an improved corrosion inhibitor for protection of copper structures on the semiconductor substrate.
- It is another object of the invention to provide an improved corrosion inhibitor, which is easily rinsed off the substrate by water or other rinse medium after the completion of the residue-removal process, thereby reducing contamination of the integrated circuit.
- Other objects and advantages of the invention will become fully apparent from the ensuing disclosure and appended claims.
- The present invention relates generally to chemical formulations useful in semiconductor manufacturing for removing residue from wafers following a resist plasma ashing step.
- In one aspect, the invention relates to a method of removing residue from a wafer following a resist plasma ashing step on such wafer, comprising contacting the wafer with a cleaning formulation, including (i) a fluoride source, (ii) at least one organic amine, (iii) a nitrogen-containing carboxylic acid or an imine, (iv) water, and optionally at least one metal chelating agent.
- Another aspect of the invention relates to a wafer cleaning formulation, including (i) a fluoride source, (ii) at least one organic amine, (iii) a nitrogen-containing carboxylic acid or an imine, (iv) water, and optionally at least one metal chelating agent.
- In a further aspect, the invention relates to a semiconductor wafer cleaning formulation for use in post plasma ashing semiconductor fabrication, comprising the following components in the percentage by weight (based on the total weight of the formulation) ranges shown:
-
a fluoride source, e.g., ammonium fluoride and/or 1-35% derivative(s) thereof organic amine(s) 20-60% a nitrogenous component selected from nitrogen-containing 0.1-40% carboxylic acids and imines water 20-50% metal chelating agent(s) 0-21% TOTAL 100% - In a still further aspect, the invention relates to a formulation useful for post chemical mechanical polishing (CMP) cleaning, which is a dilute version of the wafer cleaning formulation outlined hereinabove, wherein the dilute formulation comprises: (i) a fluoride source, (ii) at least one organic amine, (iii) 70% to 98% water, and optionally at least one metal chelating agent and optionally a nitrogen-containing carboxylic acid or an imine.
- Such formulations of the invention effectively remove inorganic residues following a plasma ashing and/or CMP step.
- Such formulations also effectively remove metal halide and metal oxide residues following plasma ashing, and effectively remove slurry particles of aluminum oxides and other oxides remaining after CMP (chemical mechanical polishing).
- The formulations of the present invention provide better stripping performance with less corrosivity than formulations containing either ammonium fluoride or amines. Formulations in accordance with the invention also provide better stripping performance at lower processing temperatures than conventional amine-containing formulations.
- The formulations of the invention utilize a chelating agent, which may be a single-component chelating agent or a multicomponent-chelating agent, to prevent metal corrosion and increase stripping effectiveness.
- Other features and advantages of the present invention will be from the ensuing disclosure and appended claims.
-
FIG. 1 is a schematic representation of a copper-specific corrosion inhibitor useful in the broad practice of the present invention, which forms a protective layer on the copper metal to prevent corrosion; -
FIG. 2 is a schematic representation of the copper-specific corrosion inhibitor being rinsed away from the copper surface by deionized water; -
FIG. 3 depicts cleaning components of the present invention interacting with a surface; -
FIG. 4 illustrates that formulations of the present invention maybe used to remove residues and particles; -
FIG. 5 provides a SEM representing results obtained from an immersion process; and -
FIG. 6 illustrates the material etch rate on interconnect materials. - The formulations of the present invention are suitable for stripping inorganic wafer residues deriving from high-density plasma etching followed by ashing with oxygen-containing plasmas. Such formulations, in dilute form, are also suitable for removing slurry particles of aluminum oxides and other oxides remaining after CMP (chemical mechanical polishing).
- The formulations advantageously contain (i) a fluoride source, such as ammonium fluoride and/or derivative(s) of ammonium fluoride, (ii) an amine or mixture of amines, (iii) a nitrogen-containing carboxylic acid or imine, (iv) water, and, optionally and preferably, (v) one or more metal chelating agents.
- As used herein, a fluoride source refers to a compound or a mixture of compounds that in the aqueous cleaning formulation provides fluorine anions.
- The preferred formulations for post etch removal include the following components in the percentage by weight (based on the total weight of the formulation) ranges shown:
-
fluoride source 1-35% organic amine(s) 20-60% a nitrogenous component selected from nitrogen containing 0.1-40% carboxylic acids and imines water 20-50% metal chelating agent(s) 0-21% TOTAL 100% - The preferred formulations for post CMP cleaning include the following components in the percentage by weight (based on the total weight of the formulation) ranges shown:
-
fluoride source 0.1%-5% organic amine(s) 1%-15% a nitrogenous component selected from nitrogen containing 0-10% carboxylic acids and imines water 70%-98% metal chelating agent(s) 0-5% TOTAL 100% - The components of the formulation as described above can be of any suitable type or species, as will be appreciated by those of ordinary skill in the art. Specific illustrative and preferred formulation components for each of the ingredients of the formulation are described below.
- Particularly preferred amines include one or more of the following:
- diglycolamine (DGA),
- methyldiethanolamine (MDEA),
- pentamethyldiethylenetriamine (PMDETA),
- triethanolamine (TEA), and
- triethylenediamine (TEDA).
- Other amines that are highly advantageous include:
- hexamethylenetetramine,
- 3,3-iminobis(N,N-dimethylpropylamine),
- monoethanolamine
- 2-(methylamino)ethanol,
- 4-(2-hydroxyethyl)morpholine
- 4-(3-aminopropyl)morpholine, and
- N,N-dimethyl-2-(2-aminoethoxyl)ethanol.
- Fluoride sources useful in the present invention include any combination of ammonia gas or ammonium hydroxide and hydrogen fluoride gas or hydrofluoric acid. Specific preferred fluoride sources include, but are not limited to one or more of the following:
- ammonium fluoride, and
- ammonium bifluoride
- Other fluoride sources that are highly advantageous include:
- triethanolammonium fluoride (TEAF);
- diglycolammonium fluoride (DGAF);
- methyldiethanolammonium fluoride (MDEAF)
- tetramethylammonium fluoride (TMAF); and
- triethylamine tris(hydrogen fluoride) (TREAT-HF).
- Specific preferred nitrogen-containing carboxylic acids and imines include one or more of the following:
- iminodiacetic acid (IDA);
- glycine;
- nitrilotriacetic acid (NTA);
- 1,1,3,3-tetramethylguanidine (TMG); and
- hydroxyethyliminodiacetic acid ethylenediaminetetracetic acid (EDTA).
- Other nitrogen-containing carboxylic acids or imines advantageously utilizable in formulations of the invention include:
- CH3C(═NCH2CH2OH)CH2C(O)N(CH3)2
- CH3C(═NCH2CH2OCH2CH2OH)CH2C(O)N(CH3)2
- CH3C(═NH)CH2C(O)CH3
- (CH3CH2)2NC(═NH)N(CH3CH2)2
- HOOCCH2N(CH3)2
- HOOCCH2N(CH3)CH2COOH
- Specific preferred metal chelating agents include:
- acetoacetamide;
- ammonium carbamate;
- ammonium pyrrolidinedithiocarbamate (APDC);
- dimethyl malonate;
- methyl acetoacetate;
- N-methyl acetoacetamide;
- 2,4-pentanedione;
- tetramethylammonium thiobenzoate;
- 1,1,1,5,5,5-hexafluoro-2,4-pentanedione H(hfac);
- 2,2,6,6-tetramethyl-3,5-heptanedione H(thd);
- tetramethylammonium trifluoroacetate;
- tetramethylthiuram disulfide (TMTDS);
- trifluoracetic acid;
- lactic acid;
- ammonium lactate;
- malonic acid
- formic acid,
- acetic acid,
- propionic acid,
- gamma-butyrolactone,
- methyldiethanolammonium trifluoroacetate, and
- trifluoroacetic acid.
- The combination of ammonium fluoride or a substituted fluoride source, as described above, with an amine (other than an amine present as a surfactant in an amount of 1% or less) provides better stripping performance with less corrosivity than formulations containing either ammonium fluoride or amines alone. In addition, the resulting alkaline solutions are effective at lower processing temperatures (e.g., 21°-40° C.) than conventional amine-containing formulations.
- The presence of nitrogen-containing carboxylic acids and/or imines enables formulations of the invention to be remarkably effective in stripping residues from semiconductor substrate surfaces containing delicate copper structures.
- The nitrogen-containing carboxylic acids or imines provide functional groups that are specifically attracted to free copper atoms. As shown schematically in
FIG. 1 , the copper-specific corrosion inhibiting-agent C, which contacts the copper surface during the residue-removal process, will attach to the copper surface and form a protective layer to prevent the copper surface being corroded by cleaning agents A+ and X−. - Moreover, as shown by
FIG. 2 , such copper-specific corrosion-inhibiting agent C can be easily rinsed off by deionized water or other solutions and therefore leaves very little contamination on the copper surface after the cleaning operation. - The use of 1,3-dicarbonyl compounds as chelating agents and to prevent metal corrosion is a preferred feature of the inventive formulations, to increase their effectiveness.
- In various prior art formulations, amines are present in amounts of 1% or less of the formulation as surfactants, or otherwise are not utilized as formulation ingredients at all. Additionally, the prior art formulations are acidic (pH<7) in character. In preferred formulations of the present invention, the amines are present as major components of the formulation, are highly effective in stripping action, and yield formulations of a basic pH character (pH>7).
- The formulations of the invention may include a wide variety of organic amines, substituted ammonium fluorides, and nitrogen-containing carboxylic acids, other than those specifically exemplified. Particular substituted ammonium fluorides of suitable character include those of the general formula, R1R2R3R4NF in which each of the respective R species is independently selected from hydrogen and aliphatic groups. Suitable nitrogen-containing carboxylic acids include those of the general structure COOH—CH2—NRR′, wherein R and R′ are each independently selected from the group consisting of hydrogen, alkyl, aryl, and carboxylic acid moieties. Suitable metal chelating agents include 1,3-dicarbonyl compounds of the general structure X—CHR—Y. In compounds of such formula, R is either a hydrogen atom or an aliphatic group, e.g., C1-C8 alkyl, aryl, alkenyl, etc. X and Y may be the same as or different from one another, and are functional groups containing multiply-bonded moieties with electron-withdrawing properties, as for example CONH2, CONHR′, CN, NO2, SOR′, or SO2Z, in which R′ represents a C1-C8 alkyl group and Z represents another atom or group, e.g., hydrogen, halo or C1-C8 alkyl.
- Other chelating agent species useful in the compositions of the invention include amine trifluoroacetates of the general formula, R1R2R3R4N+−O2CCF3 in which each of the R groups is independently selected from hydrogen and aliphatic groups, e.g., C1-C8 alkyl, aryl, alkenyl, etc.
- The formulations of the invention optionally may also include such components as surfactants, stabilizers, corrosion inhibitors, buffering agents, and co-solvents, as useful or desired in a given end use application of formulations of the invention.
- Formulations in accordance with the present invention are particularly useful on wafers that have been etched with chlorine- or fluorine-containing plasmas, followed by oxygen plasma ashing. The residues generated by this type of processing typically contain metal oxides. Such residues are often difficult to dissolve completely without causing corrosion of metal and titanium nitride features required for effective device performance. Also, metal oxide and silicon oxide slurry particles remaining after CMP will also be effectively removed by formulations in accordance with the present invention.
- The features and advantages of the invention are more fully shown by the following non-limiting examples.
- Copper-specific corrosion inhibitors including either hydrogen-containing carboxylic acids or imines were tested in two different types of alkaline cleaning formulations, with the following components and characteristics.
-
TABLE 1 Copper Temp., Etch Rate Components ° C. pH (Å/min) Formulation 1 dimethylacetoacetamide, 70 6.2 17.4 amine, and water Formulation 2 ammonium fluoride, 40 8.6 7.5 triethanolamine, pentamethdiethylenetriamine, and water - The copper etch rate was determined by a standard four-point probe technique. Addition of corrosion inhibitors in accordance with the present invention significantly slowed down the copper etch rate, as shown by the following table, and effectively prevented undesirable corrosion during the cleaning process:
-
TABLE 2 Copper Etch Reduction of Temp. Formulation Concentration pH of Rate Etch Rate Corrosion Inhibitor (° C.) Used (%) solution (Å/min) (%) Iminodiacetic Acid 40 2 1.5 8.0 1-2 −73.3~86.7 Glycine 40 2 1.5 9.2 3.6 −52.0 Nitrilotriacetic Acid 40 2 1.5 8.2 3.6 −52.0 1,1,3,3-tetramethylguanidine 40 2 1.5 8.7 3.4 −54.7 CH3C(═NCH2CH2OH)CH2C(O)N(CH3)2 70 1 24 10.9 6.2 −64.4 CH3C(═NCH2CH2OCH2CH2OH)CH2C(O)N(CH3)2 70 1 36 10.7 0.32 −98.2 CH3C(═NH)CH2C(O)CH3 40 2 13.68 7.9 4.4 −41.3 - A contamination test was carried out on Formulation 2 containing iminodiacetic acid inhibitor. The semiconductor wafer to be cleaned contained copper and silicon films. After the completion of the cleaning operation, the wafer was rinsed by deionized water at 25° C. for about 15 minutes. The Secondary Ion Mass Spectrometry data (SIMS) obtained are as follows:
-
Cu F C (atoms/cm2) (atoms/cm2) (atoms/cm2) CuxO (Å) Uncleaned Wafer 1.6 × 1010 3.3 × 1013 7.5 × 1013 42 Cleaned Wafer 8.5 × 109 5.1 × 1013 1.5 × 1013 15 - The foregoing results show that the copper oxide CuxO has been effectively removed by the cleaning process, while carbon contamination, which is mainly caused by the organic corrosion inhibitors in the cleaning formulation, has been greatly reduced.
- The present invention employs dilute alkaline fluoride in compositions for post CMP cleaning of silicon oxide or aluminum oxide particles from metallic surfaces such as copper or tungsten.
FIG. 3 depicts how the cleaning components of the present invention interact with the surface. Specially,FIG. 3 depicts thatAlkaline Fluoride 30 and chelating agents 32 dissolving inorganic oxide residues 34 after a CMP process. -
FIG. 4 illustrates that the formulations taught by the present invention may be used to remove residues 40 and particles 42 for a copper surface 44. InFIG. 4 particles 42 and residues 40 adhere to metal surface 44 as well as dielectric surface 46. Particles 42 and residues 40 may remain following a CMP process. The chemical solutions of the present invention degrade the attractive forces between the residue and the surface as well as dissolve copper and tungsten oxides and oxy-halides. - Formulations that have been found to be effective in cleaning residue and slurry particles from metal surfaces may have a pH value in a range for from about 3 to 11, but typically have pH values between about 7 and about 9. These formulations generally are aqueous solutions that comprise a fluoride source, an organic amine, and metal chelating agent. The individual constituents typically constitute a fluoride source and/or a derivative thereof as about 0.1 to about 5.0% of the formulation, wherein the fluoride may be one of many such fluoride sources known to those skilled in the art including one or more of:
- any combination of ammonia gas or ammonium hydroxide and hydrogen fluoride gas or hydrofluoric acid;
- ammonium fluoride,
- ammonium bifluoride;
- triethanolammonium fluoride (TEAF);
- diglycolammonium fluoride (DGAF);
- methyldiethanolammonium fluoride (MDEAF)
- tetramethylammonium fluoride (TMAF);
- triethylamine tris(hydrogen fluoride) (TREAT-HF).
- The organic amine or mixture of two amines typically comprises between about 1% and about 15% of the formulation of the present invention, wherein the organic amine can be one of many such organic amines known to those skilled in the art including:
- diglycolamine (DGA),
- methyldiethanolamine (MDEA),
- pentamethyldiethylenetriamine (PMDETA),
- triethanolamine (TEA),
- triethylenediamine (TEDA),
- hexamethylenetetramine,
- 3,3-iminobis(N,N-dimethylpropylamine),
- monoethanolamine
- 2-(methylamino)ethanol,
- 4-(2-hydroxyethyl)morpholine
- 4-(3-aminopropyl)morpholine, and
- N,N-dimethyl-2-(2-aminoethoxyl)ethanol.
- The nitrogenous component of the mixture typically comprises 0 to about 10% of the mixture. wherein the nitrogenous component may be one of many such nitrogenous component sources known to those skilled in the art including one or more of:
- iminodiacetic acid (IDA),
- glycine,
- nitrilotriacetic acid (NTA),
- hydroxyethyliminodiacetic acid,
- 1,1,3,-tetramethylguanidine (TMG),
- ethylenediaminetetracetic acid (EDTA),
- CH3C(═NCH2CH2OH)CH2C(O)N(CH3)2,
- CH3C(═NCH2CH2OCH2CH2OH)CH2C(O)N(CH3)2,
- CH3C(═NH)CH2C(O)CH3,
- (CH3CH2)2NC(═NH)N(CH3CH2)2,
- HOOCCH2N(CH3)2, and
- HOOCCH2N(CH3)CH2COOH.
- The metal chelating agent or mixture of chelating agents typically comprises about 0 to about 5.0% of the formulation. Typical metal chelating agent may be one of many such metal chelating agents known to those skilled in the art including:
- acetoacetamide;
- ammonium carbamate;
- ammonium pyrrolidinedithiocarbamate (APDC);
- dimethyl malonate;
- methyl acetoacetate;
- N-methyl acetoacetamide;
- 2,4-pentanedione;
- 1,1,1,5,5,5-hexafluoro-2,4-pentanedione H(hfac);
- 2,2,6,6-tetramethyl-3,5-heptanedione H(thd);
- tetramethylammonium thiobenzoate;
- tetramethylammonium trifluoroacetate;
- tetramethylthiuram disulfide (TMTDS);
- trifluoracetic acid;
- lactic acid;
- ammonium lactate;
- malonic acid
- formic acid,
- acetic acid,
- propionic acid,
- gamma-butyrolactone,
- methyldiethanolammonium trifluoroacetate, and
- trifluoroacetic acid.
- Several representative examples of formulations are:
-
Triethanolamine 4.5% Ammonium Fluoride 0.5% Water 95% -
PMDETA 3.8-4.5% Ammonium Fluoride 0.5% 2,4-Pentanedione 1% Water 94-94.7% -
TEA 1.7% PMDETA 1.5% TEAHF 2% Iminodiacetic Acid 0.4% Ammonium Bifluoride 0.5% Water 93.9% -
TEA 3.5% PMDETA 1.5% 2,4-Pentanedione 1.35% Ammonium Fluoride 1.2% Water 92.45% -
TEA 7% PMDETA 3% 2,4-Pentanedione 2.7% Ammonium Fluoride 2.4% Water 84.9% - Wafers can be immersed in chemical solutions or chemicals can be applied to the wafer surface by spray or through a brush scrubbing system.
FIG. 5 depicts a SEM representing the results obtained with a standard immersion process. SpecificallyFIG. 5 depicts Tungsten plugs after alumina slurry CMP and immersion in formula c for 10 min at 30° C. Furthermore, selectivity to exposed materials may be illustrated by etch rate data.FIG. 6 and table 3 illustrate the material etch rate on interconnect materials including an electroplated copper film. -
TABLE 3 Material Etch Rate, Å/min for 21° C. @ 30 min Copper ~1 Tantalum Nitride <0.1 Titanium <0.1 Titanium Nitride 1.0 Tungsten 0.2 TEOS 1.5 BPSG 4.5 - While the invention has been described herein with reference to specific features, aspects, and embodiments, it will be appreciated that the invention is not thus limited. The invention therefore may correspondingly embodied in a wide variety of compositions, with corresponding variations of ingredients, and end-use applications. The invention therefore is to be understood as encompassing all such variations, modifications and alternative embodiments, within the spirit and scope of the invention as hereafter claimed.
Claims (15)
1.-56. (canceled)
57. A method of removing metal halide residue, metal oxide residue, or both from a semiconductor wafer, said method comprising cleaning the wafer by contacting same with a cleaning formulation, wherein said cleaning formulation comprises (i) a fluoride source, (ii) at least one organic amine, (iii) a nitrogen-containing carboxylic acid or an imine, (iv) water, and optionally at least one metal chelating agent.
58. The method of claim 57 , wherein the nitrogen-containing carboxylic acid or imine is selected from the group consisting of:
iminodiacetic acid (IDA),
glycine,
1,1,3,3-tetramethylguanidine (TMG),
CH3C(═NCH2CH2OH)CH2C(O)N(CH3)2,
CH3C(═NCH2CH2OCH2CH2OH)CH2C(O)N(CH3)2,
CH3C(═NH)CH2C(O)CH3,
(CH3CH2)2NC(═NH)N(CH3CH2)2,
HOOCCH2N(CH3)2, and
HOOCCH2N(CH3)CH2COOH.
59. The method of claim 57 , wherein the wafer cleaning composition has a pH greater than 7.
60. The method of claim 57 , wherein the amount of nitrogen-containing carboxylic acid or imine is 0.1-40 weight percent, based on the total weight of the composition.
61. The method of claim 57 , wherein the fluoride source comprises a fluoride species selected from the group consisting of:
any combination of ammonia gas or ammonium hydroxide and hydrogen fluoride gas or hydrofluoric acid,
ammonium bifluoride,
ammonium fluoride,
triethanolammonium fluoride (TEAF),
diglycolammonium fluoride (DGAF),
tetramethylammonium fluoride (TMAF),
methyldiethanolammonium fluoride (MDEAF), and
triethylamine tris(hydrogen fluoride) (TREAT-HF).
62. The method of claim 57 , wherein the amount of fluoride source is 1-35% weight percent, based on the total weight of the composition.
63. The method of claim 57 , wherein the organic amine(s) comprise an amine(s) selected from the group consisting of:
diglycolamine (DGA),
methyldiethanolamine (MDEA),
pentamethyldiethylenetriamine (PMDETA),
triethanolamine (TEA),
triethylenediamine (TEDA),
hexamethylenetetramine,
3,3-iminobis(N,N-dimethylpropylamine),
monoethanolamine,
2-(methylamino)ethanol,
4-(2-hydroxyethyl)morpholine,
4-(3-aminopropyl)morpholine, and
N,N-dimethyl-2-(2-aminoethoxyl)ethanol.
64. The method of claim 57 , wherein the amount of organic amine(s) is 20-60% weight percent, based on the total weight of the composition.
65. The method of claim 57 , wherein the amount of water is 20-50% weight percent, based on the total weight of the composition.
66. The method of claim 57 , wherein the wafer cleaning formulation further comprises at least one metal chelating agent selected from the group consisting of:
acetoacetamide,
ammonium carbamate,
ammonium pyrrolidinedithiocarbamate (APDC),
dimethyl malonate,
methyl acetoacetate,
N-methyl acetoacetamide,
2,4-pentanedione,
1,1,1,5,5,5-hexafluoro-2,4-pentanedione H(hfac),
2,2,6,6-tetrammethyl-3,5-heptanedione H(thd),
tetramethylammonium thiobenzoate,
tetramethylammonium trifluoroacetate,
tetramethylthiuram disulfide (TMTDS),
trifluoracetic acid,
lactic acid,
ammonium lactate,
malonic acid,
formic acid,
acetic acid,
propionic acid,
gamma-butyrolactone,
iminodiacetic acid,
methyldiethanolammonium trifluoroacetate, and
trifluoroacetic acid.
67. The method of claim 66 , wherein the amount of at least one metal chelating agent is 0-21% weight percent, based on the total weight of the composition.
68. The method of claim 57 , wherein said fluoride source comprises a compound having the general formula R1R2R3R4NF in which each of the R groups is independently selected from hydrogen atoms, C1-C8 alkyl, aryl and alkenyl groups, and wherein said formulation includes a metal chelating agent of the formula:
X—CHR—Y
X—CHR—Y
in which R is either hydrogen, C1-C8 alkyl, aryl or alkenyl group and X and Y are functional groups containing multiply bonded moieties having electron-withdrawing properties.
69. The method of claim 67 , wherein each of X and Y is independently selected from CONH2, CONHR′, CN, NO2, SOR′, and SO2Z in which R′ is C1-C8 alkyl and Z is hydrogen, halo, or C1-C8 alkyl.
70. The method of claim 57 , wherein the nitrogen-containing carboxylic or imine comprises iminodiacetic acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/826,840 US20150344826A1 (en) | 1997-01-09 | 2015-08-14 | Aqueous cleaning composition containing copper-specific corrosion inhibitor for cleaning inorganic residues on semiconductor substrate |
Applications Claiming Priority (9)
Application Number | Priority Date | Filing Date | Title |
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US3419497P | 1997-01-09 | 1997-01-09 | |
US4482497P | 1997-04-25 | 1997-04-25 | |
US08/924,021 US6224785B1 (en) | 1997-08-29 | 1997-08-29 | Aqueous ammonium fluoride and amine containing compositions for cleaning inorganic residues on semiconductor substrates |
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Also Published As
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US20050215446A1 (en) | 2005-09-29 |
US20030078173A1 (en) | 2003-04-24 |
TWI241336B (en) | 2005-10-11 |
US20100035785A1 (en) | 2010-02-11 |
CN100456429C (en) | 2009-01-28 |
US8293694B2 (en) | 2012-10-23 |
WO2003035797A1 (en) | 2003-05-01 |
JP2005507166A (en) | 2005-03-10 |
EP1446460A1 (en) | 2004-08-18 |
CN101434894B (en) | 2012-02-01 |
US9109188B2 (en) | 2015-08-18 |
US20130072411A1 (en) | 2013-03-21 |
KR20040045876A (en) | 2004-06-02 |
CN1575328A (en) | 2005-02-02 |
EP1446460A4 (en) | 2009-08-19 |
US7605113B2 (en) | 2009-10-20 |
US6896826B2 (en) | 2005-05-24 |
CN101434894A (en) | 2009-05-20 |
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