WO2002039488A2 - Herstellungsverfahren für eine integrierte schaltung - Google Patents
Herstellungsverfahren für eine integrierte schaltung Download PDFInfo
- Publication number
- WO2002039488A2 WO2002039488A2 PCT/EP2001/010783 EP0110783W WO0239488A2 WO 2002039488 A2 WO2002039488 A2 WO 2002039488A2 EP 0110783 W EP0110783 W EP 0110783W WO 0239488 A2 WO0239488 A2 WO 0239488A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- contact hole
- line
- trenches
- mask
- providing
- Prior art date
Links
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
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76897—Formation of self-aligned vias or contact plugs, i.e. involving a lithographically uncritical step
-
- 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
- H01L21/28—Manufacture of electrodes on semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/268
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/48—Data lines or contacts therefor
- H10B12/482—Bit lines
Definitions
- the present invention relates to a manufacturing method for an integrated circuit.
- the general problem on which the present invention is based is that when producing a common self-aligned bitline contact of a DRAM memory cell pair, the widening of the contact hole or its lateral offset leads to a growing risk of short circuits to adjacent bit lines with decreasing design rules , The increasing aspect ratio of the bitline contact is increasingly problematic due to the decreasing horizontal and increasing vertical dimensions, i.e. the height of the gate stack.
- FIG. 3 shows a schematic representation of a known integrated DRAM circuit using silicon technology.
- 1 denotes a silicon semiconductor substrate in which an active area or circuit area SS is provided, surrounded by isolation trenches STI.
- a contact hole KL is introduced into the insulation layer IS and contains a contact which has a polysilicon contact plug PP in the lower region and a bit line BL2 in the upper region. Adjacent for bit line BL2 there are further bit lines BL1 and BL3 in corresponding bit line trenches BG1 and BG3.
- the problem with this arrangement is the fact that the contact hole KL to the circuit area SS and to the adjacent bit lines can have a certain offset, in the present example a shift to the left of FIG. 3.
- the bit lines BL1, BL2, BL3 are produced in such a way that A tungsten metal layer is deposited over the bit line trenches and over the substrate surface, which is polished back in a subsequent process step by a chemical-mechanical polishing process.
- the offset of the contact hole KL to the left can lead to a short circuit between the bit lines BL1 and BL2 at the point designated BBS, which interferes with the function of these bit lines.
- bit line contact hole level which is relatively uncritical in terms of the design, is produced with minimal contact hole dimensions in order to alleviate the short circuit problem with the neighboring bit line produced in a separate lithography.
- the overlay requirements are very high. This complicates and increases the cost of lithography and contact hole etching without solving the problem in principle.
- the risk of insufficiently opened bit line contacts on the contact base increases.
- the requirements for the alignment of the bit line contact to the active area or circuit area SS are increased. This leads to a general contradiction that is becoming more and more problematic with further shrinks.
- the manufacturing method according to the invention has i.a. the advantage that by adding fewer technologically uncritical processes, the actual contacting of the silicon is decoupled from the contacting of the continuous bit line. It is then possible to relax the production of the contact hole mask with regard to dimension and overlay, to optimize the contact hole etching separately and still to avoid short circuits between the bit lines.
- a contact plug made of a conductive material is provided in the lower region of the contact hole.
- the spacer region is produced by depositing and anisotropically etching back an insulating spacer layer, as a result of which the
- Spacer layer is left only on the side walls of the contact hole.
- an anti-reflection coating is deposited on the entire structure, which essentially fills the contact hole.
- a mask for the line trenches is applied to the anti-reflection coating; the first and third line trenches are etched into the insulation layer using the mask after removal of the overlying anti-reflection coating; and the second line trench is formed using the mask and after removing the anti-reflective coating from the upper region of the contact hole.
- an insulating spacer layer is deposited over the structure and a mask for the line trenches is applied to the insulating spacer layer; the first, second and third line trench are etched into the insulation layer using the mask after removal of the insulating spacer layer above, the insulating spacer layer being at least partially removed from the contact hole when the second line trench is formed.
- the line trenches have a distance and a width which corresponds to the minimum structural width.
- the circuit area is surrounded by STI trenches.
- the line material is tungsten.
- the upper region of the spacer region is removed during chemical mechanical polishing.
- the spacer regions are produced from CVD silicon dioxide.
- the lines are bit lines of an integrated memory circuit.
- La-d are schematic representations of various process steps of a manufacturing method for an integrated DRAM circuit in silicon technology as the first embodiment of the present invention
- 2-c show schematic representations of different process steps of a manufacturing method for an integrated DRAM circuit in silicon technology as a second embodiment of the present invention.
- Fig. 3 is a schematic representation of a known integrated DRAM circuit in silicon technology.
- 1a-d show schematic representations of different process steps of a manufacturing method for an integrated DRAM circuit in silicon technology as the first embodiment of the present invention.
- a contact hole KL is first provided in the insulation layer IS, which contacts the circuit area SS with a certain offset. This is followed by the provision of the polysilicon contact plug PP in that polysilicon is deposited over the entire surface and then etched back to a predetermined depth.
- a CVD-SiO layer with a thickness of approximately 20 nm to 70 nm is deposited, which is denoted by 10 in FIG.
- anisotropic etching of the SiO 2 takes place by means of a separate etching process in order to form spacer regions 10 ′′ on the side walls of the upper region of the contact hole KL on the polysilicon contact plug PP from the spacer layer 10, as illustrated in FIG. 1b.
- the spacer layer 10 on the lower contact surface to the polysilicon contact plug PP is removed, whereas the Si0 2 remains covered against the upper side walls of the contact hole KL.
- an antireflection coating 20 is applied over the entire structure, which essentially fills the contact hole KL, as illustrated in FIG. 1b.
- a photoresist mask MO is formed over the resulting structure and defines the position of the later bit lines BL1, BL2, BL3.
- the antireflection coating 20 is removed above the insulation layer IS and to a certain extent in the contact hole KL.
- the insulation layer IS is selectively etched using the mask MO in order to form the bit line trenches BG1, BG3 on the left or right of the contact hole KL.
- the mask MO and the antireflection coating 20 are then removed in corresponding etching processes or solution processes.
- Three bit line trenches BL1, BL2, BL3 are thus obtained, one of the bit line trenches BL2 lying between the spacer regions 10 ′′ and the other bit lines line areas BLl, BL3, are housed adjacent in the insulation layer IS.
- bit lines BL1, BL2, BL3 are formed.
- FIG. 1d illustrates that the surface of the insulation layer IS is also partially removed in the chemical-mechanical polishing step (dashed line in FIG. 1).
- This removal of the surface of the insulation layer IS and also the removal of the upper area of the spacer areas 10 ′′ leads to the fact that on both sides of the middle bit line BL2 the entire thickness of the spacer area 10 ′′ has an effect on the side wall of the contact hole to improve the lateral insulation, as is evident from Figure ld bar.
- a short-circuit area BBS (compare in FIG. 3) is thus avoided, and the bit line BL2 is adequately insulated from the adjacent bit lines BL1, BL3 by the surface spacer regions 10 ′′, the surface insulation area being designated BBI in FIG.
- 2-c show schematic representations of different process steps of a manufacturing method for an integrated DRAM circuit in silicon technology as a second embodiment of the present invention.
- the second embodiment which is described with reference to FIGS. 2a-c, differs from the first embodiment in that no antireflection coating 20 (compare with FIG. 1b) is used.
- the starting point of the second embodiment corresponds to the state shown in Figure la.
- the photoresist mask MO is applied directly to the CVD-Si0 2 spacer layer 10, as illustrated in FIG. 2a.
- the thickness of this CVD-Si0 2 spacer layer 10 is approximately 20 nm to 70 nm analogous to the first embodiment.
- the spacer layer 10 is first etched using the mask MO and then the insulation layer IS lying underneath in a corresponding anisotropic etching process, the polysilicon contact plug PP acting as an etching stop within the contact hole KL.
- the process stage shown in FIG. 2b it should be mentioned that, as shown in FIG. 2a, there is an offset of the mask MO, but this is not critical since the left side wall of the contact hole KL, which is in a critical position with respect to the later bit line BL1, remains covered with SiO 2 , since this The area is protected with the lacquer of the mask MO.
- FIG. 2b After removal of the mask MO, a structure is obtained as shown in FIG. 2b, with spacer regions 10 ′′ in the upper region of the contact hole KL, of which the left spacer region is significantly thicker than the right spacer region.
- a whole-area process takes place, analogous to the first embodiment Deposition of tungsten over the resulting structure and a subsequent chemical-mechanical polishing back of the tungsten in order to obtain the structure shown in FIG. 2c, in which separate bit lines BL1, BL2, BL3 are present in the corresponding bit line trenches BG1, BG2, BG3.
- the area designated BBI is also not critical here, because the bit line BL2 is separated from the bit line BL1 by a wide spacer area BBI, thus minimizing the risk of short circuit.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002541714A JP2004514275A (ja) | 2000-11-08 | 2001-09-18 | 集積回路の製造方法 |
US10/399,985 US7084027B2 (en) | 2000-11-08 | 2001-09-18 | Method for producing an integrated circuit |
KR10-2003-7006275A KR100515441B1 (ko) | 2000-11-08 | 2001-09-18 | 집적회로 제조 방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10055290.0 | 2000-11-08 | ||
DE10055290A DE10055290C1 (de) | 2000-11-08 | 2000-11-08 | Herstellungsverfahren für eine integrierte Schaltung |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002039488A2 true WO2002039488A2 (de) | 2002-05-16 |
WO2002039488A3 WO2002039488A3 (de) | 2002-07-18 |
Family
ID=7662533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/010783 WO2002039488A2 (de) | 2000-11-08 | 2001-09-18 | Herstellungsverfahren für eine integrierte schaltung |
Country Status (6)
Country | Link |
---|---|
US (1) | US7084027B2 (de) |
JP (1) | JP2004514275A (de) |
KR (1) | KR100515441B1 (de) |
DE (1) | DE10055290C1 (de) |
TW (1) | TW517291B (de) |
WO (1) | WO2002039488A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011002769B4 (de) | 2011-01-17 | 2013-03-21 | Globalfoundries Dresden Module One Limited Liability Company & Co. Kg | Halbleiterbauelement und Verfahren zur Herstellung einer Hybridkontaktstruktur mit Kontakten mit kleinem Aspektverhältnis in einem Halbleiterbauelement |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5792687A (en) * | 1996-08-01 | 1998-08-11 | Vanguard International Semiconductor Corporation | Method for fabricating high density integrated circuits using oxide and polysilicon spacers |
US5864156A (en) * | 1995-12-15 | 1999-01-26 | Micron Technology, Inc. | Isolated plugged contacts |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4656732A (en) * | 1984-09-26 | 1987-04-14 | Texas Instruments Incorporated | Integrated circuit fabrication process |
US5414221A (en) * | 1991-12-31 | 1995-05-09 | Intel Corporation | Embedded ground plane and shielding structures using sidewall insulators in high frequency circuits having vias |
DE19528746C1 (de) * | 1995-08-04 | 1996-10-31 | Siemens Ag | Verfahren zum Erzeugen einer Siliziumdioxidschicht auf Oberflächenabschnitten einer Struktur |
KR970707571A (ko) * | 1995-09-14 | 1997-12-01 | 이시마루 미키오 | 축소 치수용 다마스크 공정(damascene process for reduced feature size) |
US6037211A (en) * | 1997-05-05 | 2000-03-14 | Vanguard International Semiconductor Corporation | Method of fabricating contact holes in high density integrated circuits using polysilicon landing plug and self-aligned etching processes |
US6258663B1 (en) * | 1998-05-01 | 2001-07-10 | Vanguard International Semiconductor Corporation | Method for forming storage node |
TW381342B (en) * | 1998-06-17 | 2000-02-01 | United Microelectronics Corp | Self-alignment capacitor manufacturing method |
US6114253A (en) * | 1999-03-15 | 2000-09-05 | Taiwan Semiconductor Manufacturing Company | Via patterning for poly(arylene ether) used as an inter-metal dielectric |
KR20000065823A (ko) | 1999-04-09 | 2000-11-15 | 윤종용 | 반도체 메모리 장치의 비트 라인 구조 |
JP4382321B2 (ja) * | 1999-12-08 | 2009-12-09 | サムスン エレクトロニクス カンパニー リミテッド | 自己整列コンタクト構造体を有する半導体素子及びその製造方法 |
US20030139034A1 (en) * | 2002-01-22 | 2003-07-24 | Yu-Shen Yuang | Dual damascene structure and method of making same |
KR100434505B1 (ko) * | 2002-06-19 | 2004-06-05 | 삼성전자주식회사 | 다마신 배선을 이용한 반도체 소자의 제조방법 |
KR100434511B1 (ko) * | 2002-08-12 | 2004-06-05 | 삼성전자주식회사 | 다마신 배선을 이용한 반도체 소자의 제조방법 |
KR100539272B1 (ko) * | 2003-02-24 | 2005-12-27 | 삼성전자주식회사 | 반도체 장치 및 그 제조방법 |
-
2000
- 2000-11-08 DE DE10055290A patent/DE10055290C1/de not_active Expired - Fee Related
-
2001
- 2001-09-18 WO PCT/EP2001/010783 patent/WO2002039488A2/de active IP Right Grant
- 2001-09-18 KR KR10-2003-7006275A patent/KR100515441B1/ko not_active IP Right Cessation
- 2001-09-18 JP JP2002541714A patent/JP2004514275A/ja not_active Ceased
- 2001-09-18 US US10/399,985 patent/US7084027B2/en not_active Expired - Fee Related
- 2001-11-07 TW TW090127636A patent/TW517291B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5864156A (en) * | 1995-12-15 | 1999-01-26 | Micron Technology, Inc. | Isolated plugged contacts |
US5792687A (en) * | 1996-08-01 | 1998-08-11 | Vanguard International Semiconductor Corporation | Method for fabricating high density integrated circuits using oxide and polysilicon spacers |
Non-Patent Citations (1)
Title |
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"FABRICATING ONE SEMICONDUCTOR CONTACT STUD BORDERLESS TO ANOTHER" IBM TECHNICAL DISCLOSURE BULLETIN, IBM CORP. NEW YORK, US, Bd. 34, Nr. 4B, 1. September 1991 (1991-09-01), Seiten 277-279, XP000189467 ISSN: 0018-8689 * |
Also Published As
Publication number | Publication date |
---|---|
TW517291B (en) | 2003-01-11 |
US20040014310A1 (en) | 2004-01-22 |
WO2002039488A3 (de) | 2002-07-18 |
JP2004514275A (ja) | 2004-05-13 |
DE10055290C1 (de) | 2002-07-25 |
KR20030059230A (ko) | 2003-07-07 |
KR100515441B1 (ko) | 2005-09-20 |
US7084027B2 (en) | 2006-08-01 |
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