WO2006077730A1 - Cmp研磨方法、cmp研磨装置、及び半導体デバイスの製造方法 - Google Patents
Cmp研磨方法、cmp研磨装置、及び半導体デバイスの製造方法 Download PDFInfo
- Publication number
- WO2006077730A1 WO2006077730A1 PCT/JP2005/024001 JP2005024001W WO2006077730A1 WO 2006077730 A1 WO2006077730 A1 WO 2006077730A1 JP 2005024001 W JP2005024001 W JP 2005024001W WO 2006077730 A1 WO2006077730 A1 WO 2006077730A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- organic solvent
- cmp polishing
- cleaning
- substrate
- polishing
- Prior art date
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000004065 semiconductor Substances 0.000 title claims abstract description 46
- 230000008569 process Effects 0.000 title description 31
- 239000003960 organic solvent Substances 0.000 claims abstract description 75
- 239000000758 substrate Substances 0.000 claims abstract description 58
- 239000011229 interlayer Substances 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000011148 porous material Substances 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims description 67
- 238000010438 heat treatment Methods 0.000 claims description 61
- 239000002184 metal Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
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- 230000004888 barrier function Effects 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 7
- 150000002170 ethers Chemical class 0.000 claims description 5
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- 150000002430 hydrocarbons Chemical class 0.000 claims description 5
- -1 nitrogen-containing organic compounds Chemical class 0.000 claims description 5
- 150000001298 alcohols Chemical class 0.000 claims description 4
- 150000001299 aldehydes Chemical class 0.000 claims description 4
- 150000002148 esters Chemical class 0.000 claims description 4
- 150000002222 fluorine compounds Chemical class 0.000 claims description 4
- 150000002576 ketones Chemical class 0.000 claims description 4
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- 150000005846 sugar alcohols Polymers 0.000 claims description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
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- BJAARRARQJZURR-UHFFFAOYSA-N trimethylazanium;hydroxide Chemical compound O.CN(C)C BJAARRARQJZURR-UHFFFAOYSA-N 0.000 description 5
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Natural products CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- ZQBFAOFFOQMSGJ-UHFFFAOYSA-N hexafluorobenzene Chemical compound FC1=C(F)C(F)=C(F)C(F)=C1F ZQBFAOFFOQMSGJ-UHFFFAOYSA-N 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical compound CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- LPEKGGXMPWTOCB-UHFFFAOYSA-N 8beta-(2,3-epoxy-2-methylbutyryloxy)-14-acetoxytithifolin Natural products COC(=O)C(C)O LPEKGGXMPWTOCB-UHFFFAOYSA-N 0.000 description 1
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 1
- MRABAEUHTLLEML-UHFFFAOYSA-N Butyl lactate Chemical compound CCCCOC(=O)C(C)O MRABAEUHTLLEML-UHFFFAOYSA-N 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 1
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical group CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 1
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 229910018540 Si C Inorganic materials 0.000 description 1
- RHQDFWAXVIIEBN-UHFFFAOYSA-N Trifluoroethanol Chemical compound OCC(F)(F)F RHQDFWAXVIIEBN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000001191 butyl (2R)-2-hydroxypropanoate Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229930192904 chamone Natural products 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- NEHMKBQYUWJMIP-NJFSPNSNSA-N chloro(114C)methane Chemical compound [14CH3]Cl NEHMKBQYUWJMIP-NJFSPNSNSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- ODQWQRRAPPTVAG-GZTJUZNOSA-N doxepin Chemical compound C1OC2=CC=CC=C2C(=C/CCN(C)C)/C2=CC=CC=C21 ODQWQRRAPPTVAG-GZTJUZNOSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005468 ion implantation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- AUHZEENZYGFFBQ-UHFFFAOYSA-N mesitylene Substances CC1=CC(C)=CC(C)=C1 AUHZEENZYGFFBQ-UHFFFAOYSA-N 0.000 description 1
- 125000001827 mesitylenyl group Chemical group [H]C1=C(C(*)=C(C([H])=C1C([H])([H])[H])C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229940057867 methyl lactate Drugs 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
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- 150000003462 sulfoxides Chemical class 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- 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
-
- 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
- C11D7/50—Solvents
- C11D7/5004—Organic solvents
- C11D7/5013—Organic solvents 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
- C11D7/50—Solvents
- C11D7/5004—Organic solvents
- C11D7/5022—Organic solvents containing oxygen
-
- 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
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
- H01L21/76826—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc. by contacting the layer with gases, liquids or plasmas
-
- 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
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76822—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc.
- H01L21/76828—Modification of the material of dielectric layers, e.g. grading, after-treatment to improve the stability of the layers, to increase their density etc. thermal treatment
-
- C11D2111/22—
Definitions
- a porous material (which is usually called a porous low-k material) that has been hydrophobized is used as an interlayer insulating film material for a semiconductor integrated circuit formed on a substrate.
- CMP polishing method that removes wiring material and barrier metal, and CMP polishing device that can implement this CMP polishing method
- the present invention relates to a semiconductor device manufacturing method using this CMP polishing method.
- a trench is formed in the porous material (Si0 2) or Ranaru interlayer insulating film has been rendered hydrophobic and formed on a substrate, removing by CMP polished by embedding a copper wiring in the trench Indicates.
- Fig. 8 (a) shows the state before CMP polishing of the copper wiring part.
- An etching stopper 52 is formed on the lower wiring 51 and an interlayer insulating film 53 made of a hydrophobic porous material is formed thereon.
- a cap film 54 is provided to prevent the slurry and the cleaning liquid containing the surfactant from flowing into the interlayer insulating film 53.
- the film 54 is made of SiO 2 , SiO 2 C, SiC 3 or the like.
- a diffusion prevention layer 5 5, which is a barrier metal, is provided on the cap film 5 4 and to cover the trench part from which the interlayer insulating film 53 is removed, and copper 5 6 serving as a wiring is formed thereon and in the trench part. Is embedded.
- the diffusion preventing layer 55 prevents the copper 56 from diffusing into the interlayer insulating film 53, and has a two-layer structure of Ta and TaN.
- the upper copper layer 56 and the diffusion prevention layer 55 are removed by CMP polishing, leaving only the copper portion 56 6 in the trench portion as shown in FIG. 8 (b). And after that, the surface is washed with a cleaning liquid containing a surfactant to wash away and remove slurry, polishing residues and metal contamination remaining on the surface.
- the cap film 54 plays a role of preventing the cleaning liquid from entering the interlayer insulating film 53. After that, rinse with water and wash with running water to remove the cleaning solution containing the surfactant, and finally dry the substrate.
- the cap film 54 is required to reduce the capacitance of this portion by reducing or eliminating the cap film 54. Even when the cap film 54 is omitted, the cap film 54 is formed in a mottled shape even when the cap film 54 is thinned, and a portion where the cap film 54 is not formed occurs depending on the location. Then, there is a problem that the cleaning liquid containing the slurry or the surfactant soaks into the porous interlayer insulating film 53.
- the slurry soaked in the interlayer insulating film 53 and the cleaning liquid containing the surfactant are difficult to remove by subsequent cleaning with water. This is due to the fact that these contain organic substances and are not easily removed by washing with water, and the interlayer insulating film 53 has been subjected to a hydrophobic treatment.
- This hydrophobization treatment allows moisture to penetrate the interlayer insulating film 53 in a later process. This process is performed by replacing the OH group formed at the terminal end of the porous SiO 2 constituting the interlayer insulating film 53 with a methyl group or the like. Disclosure of the invention
- the present invention has been made in view of such circumstances.
- the present invention provides a wiring material and a barrier.
- the slurry and polishing residue remaining on the substrate surface are cleaned and removed with a cleaning solution containing a surface active agent, and then the organic material soaks into the interlayer insulating film.
- CMP polishing method capable of efficiently removing the CMP
- CMP polishing apparatus capable of performing the CMP polishing method
- a first invention for achieving the above object is to provide a wiring material and a barrier metal for a semiconductor integrated circuit formed on a substrate using a hydrophobic porous material as an interlayer insulating film material. After performing CMP polishing for removing, the slurry and polishing residue remaining on the substrate surface are washed away with a cleaning liquid, and thereafter, the substrate surface contains an organic solvent or an organic solvent.
- This CMP polishing method is characterized in that at least one of cleaning treatment with a solution and heating treatment is performed.
- At least one of cleaning treatment with an organic solvent or a solution containing an organic solvent and heat treatment are performed.
- organic substances that have penetrated into the interlayer insulating film can be efficiently washed and removed by washing with an organic solvent or a solution containing an organic solvent.
- a solution containing an organic solvent is used for washing, the effect is reduced when the concentration of the organic solvent is low.
- the organic material soaked into the interlayer insulating film can be thermally decomposed and removed as a gas by heat treatment. In this case, the heating temperature needs to be equal to or higher than the temperature at which the organic material soaked in the interlayer insulating film is thermally decomposed.
- the substrate wet by the washing can be dried at the same time by performing the heat treatment later.
- the heat treatment can be substituted.
- the substrate pre-beta treatment corresponds to the heat treatment in the claims. .
- the cleaning liquid preferably contains a surfactant.
- the second invention for achieving the object is the first invention, wherein the organic solvent includes alcohols, aldehydes, ketones, esters, ethers, amides, polyvalents.
- the alcohol and its derivatives, nitrogen-containing organic compounds, hydrocarbons, halogenated hydrocarbons, and fluorine compounds containing at least one kind of organic solvent are used.
- organic solvents alcohols, aldehydes, ketones, Esters, ethers, ethers, polyhydric alcohols and derivatives thereof, and nitrogen-containing organic compounds are particularly preferred as organic solvents for washing because they dissolve both water and organic substances.
- organic solvents hydrocarbons, halogenated hydrocarbons, and fluorine compounds are particularly preferable as organic substances for removing organic substances because of the high solubility of organic substances.
- a third invention for achieving the object is the first invention, wherein the heat treatment is a reduced pressure heat treatment.
- Copper wiring is exposed on the surface of the substrate, which can be oxidized during the heat treatment. Therefore, in order to prevent copper oxidation, it is preferable to employ a reduced pressure heat treatment as the heat treatment.
- a fourth invention for achieving the above object is the first invention, characterized in that the substrate is placed in an inert gas during the heat treatment.
- the substrate in order to prevent copper oxidation accompanying the heat treatment, it is more preferable to place the substrate in an inert gas such as N 2 , Ar, or He gas during the heat treatment.
- an inert gas such as N 2 , Ar, or He gas
- a fifth invention for achieving the above object is to perform cleaning with a solution containing an organic solvent or an organic solvent on a substrate which has been subjected to CMP polishing, and the slurry and polishing residue remaining on the surface have been cleaned and removed with a cleaning solution.
- a CMP polishing apparatus having a cleaning processing apparatus for processing.
- CMP operation until cleaning with a cleaning liquid
- cleaning processing with an organic solvent or a solution containing an organic solvent are performed in a series of steps. It can be carried out.
- a sixth invention for achieving the above object is characterized by comprising a heat treatment apparatus for heat-treating a substrate which has been subjected to CMP polishing and the slurry and polishing residue remaining on the surface being cleaned and removed with a cleaning liquid.
- CMP polishing equipment The
- the heat treatment apparatus is attached to the CMP polishing apparatus, the CMP operation (up to cleaning with the cleaning liquid) and the heat treatment can be performed in a series of steps.
- a substrate which has been subjected to CMP polishing and has the slurry and polishing residue remaining on the surface cleaned and removed with a cleaning solution, is cleaned with a solution containing an organic solvent or an organic solvent.
- a CMP polishing apparatus comprising: a cleaning / removing apparatus for processing; and a heat processing apparatus for heat-processing the substrate.
- the cleaning apparatus and the heat treatment apparatus are attached to the CMP polishing apparatus, the CMP operation (until cleaning with the cleaning liquid), the cleaning process with the organic solvent or the solution containing the organic solvent, and the heating Processing can be performed in a series of steps.
- An eighth invention for achieving the above object has a step of removing a wiring material and a barrier metal using the CMP polishing method according to any one of the first to fourth inventions.
- FIG. 1 is a diagram showing an outline of a substrate to which a CMP polishing method according to an embodiment of the present invention is applied, and shows a state where CMP polishing is completed.
- FIG. 2 is a diagram showing an outline of the CMP polishing apparatus according to the embodiment of the present invention.
- FIG. 3 is a diagram showing a process of the semiconductor device manufacturing method according to the embodiment of the present invention.
- FIG. 4 shows the leakage current density of the substrate in Example A.
- FIG. 5 is a diagram showing the leakage current density of the substrate in Example B.
- Figure 6 shows the relationship between the ethanol concentration and the substrate leakage current density.
- Figure 7 shows the relationship between the ethanol concentration and the substrate leakage current density.
- Fig. 8 shows the process of forming a trench on an interlayer insulating film made of a hydrophobic porous chamber material formed on a substrate, and removing the copper wiring embedded in the trench by CMP polishing.
- FIG. 1 is a diagram showing an outline of a substrate to which a CMP polishing method according to an embodiment of the present invention is applied, and shows a state in which CMP polishing is completed.
- FIGS. 1 (a) etching scan stopper 2 on the lower layer wiring 1 is formed, the interlayer insulating film 3 made of a hydrophobized porous substance (Si_ ⁇ 2) is formed thereon.
- a cap film 4 is provided on the interlayer insulating film 3.
- the cap film 4 is formed of Si 0 2 , SiO C, Si C, or the like.
- a diffusion prevention layer 5 is provided so as to cover the trench portion from which the interlayer insulating film 3 has been removed, and copper 6 serving as a wiring is embedded in the trench portion.
- the diffusion prevention layer 5 has a two-layer structure of Ta and TaN. This structure is basically the same as that shown in Fig. 8 (b). However, since the cap film 4 is thin (about 20 nm), the cap film 4 completely covers the surface of the interlayer insulating film 3. There is a portion where the interlayer insulating film 3 is exposed in some places.
- Figure 1 (b) What is shown is different from that shown in FIG. 1 (a) only in that the cap film 4 is not formed.
- the organic matter in the polishing slurry has penetrated into the interlayer insulating film 3.
- These substrates are washed with a cleaning solution containing a surfactant in the same manner as in the past to remove residual slurry and polishing residues. Then, organic substances in the cleaning liquid containing the surfactant soak into the interlayer insulating film 3.
- the interlayer insulating film 3 has been subjected to a hydrophobizing treatment, the hydrophobicity is weakened by the action of the surfactant, so that organic substances are particularly likely to penetrate into the interlayer insulating film 3 in this process.
- the substrate is washed with an organic solvent or a solution containing the organic solvent, and the organic substance soaked into the interlayer insulating film 3 is removed by washing. .
- the interlayer insulating film 3 has been subjected to a hydrophobic treatment, since it is an organic solvent, it can be penetrated into the interlayer insulating film 3 without being affected by it, and the organic matter can be dissolved and removed by washing.
- the substrate is dried, and the organic solvent adhering to the surface or the solution containing the organic solvent is removed.
- spin drying or heating to some extent may be performed, but drying may be performed by blowing nitrogen gas. You can do heating and gas blowing at the same time.
- organic solvents examples include alcohols such as probe alcohol, isopropyl / leanoreconole, ethanol and 1-pronole.
- Alcohols such as probe alcohol, isopropyl / leanoreconole, ethanol and 1-pronole.
- Nonole, methanol, 1 hexanol, etc. aldehydes such as acetyl aldehyde, ketones such as acetone, diacetone alcohol, methyl ethyl ketone, etc., esters such as ethyl formate, propyl formate, ethyl acetate, acetic acid Methyl, methyl lactate, butyl lactate, etyl lactate, etc.
- ethers are sulfoxides such as dimethyl sulfoxide, tetrahydrofuran, dioxane, diglyme, etc.
- Amides are N, N-dimethylformamide, dimethyl imid
- Polyhydric alcohols and their derivatives such as dazolidinone and N-methylpyrrolidone are ethylene glycol, glycerin, diethylene glycol, diethylene dallic monomethyl ether, etc.
- examples thereof include organic solvents that dissolve both water and organic substances, such as min, imidazole, and dimethylamine.
- hydrocarbons include mesitylene, pentane, hexane, octane, benzene, tonoleene, xylene, and jetinolebenzene, S, and nonogenated hydrocarbons include methylene chloride, methyl chloride, and carbon tetrachloride.
- the fluorine compound include organic solvents such as trifluoroethanol and hexafluorobenzene, which have high organic solubility.
- the boiling point is preferably 300 ° C. or lower, and more preferably 200 ° C. or lower.
- the substrate may be washed with a solution containing a surfactant and then washed with water, as in the conventional method.
- the substrate in the state shown in FIG. 1 is washed with an organic solvent or a solution containing an organic solvent and then subjected to heat treatment as in the conventional case.
- the organic matter soaked into the interlayer insulating film 3 is thermally decomposed and removed. That is, by heating the substrate at a temperature higher than the thermal decomposition temperature of the organic substance soaked into the interlayer insulating film 3, these organic substances are thermally decomposed.
- a higher pyrolysis temperature is more efficient, but it must be below the temperature that does not impede the function of the semiconductor device. The temperature is 400 ° C or less.
- the difference between the heat treatment and the heating for drying described above is that the heat treatment heats up to a temperature at which decomposition of the organic matter occurs, but the heat by drying does not heat up to such a high temperature, but the organic solvent or organic solvent. It is a point which only evaporates the solution containing a medium.
- heating under reduced pressure may be performed in an inert gas.
- the substrate may be washed with a solution containing a surfactant and then washed with water as in the conventional method, and then the heat treatment may be performed.
- this pre-bake process may be used as a heat treatment.
- the CMP polishing apparatus includes a polishing unit 1 1, an abrasive metal contamination cleaning unit 1 2, an organic solvent cleaning unit 1 3, a wafer heat treatment unit 1 4, a first transport unit 15, and a second transport unit. It consists of 16 and each part is separated by a partition.
- the polishing unit 11 is provided with a CMP polishing mechanism including a polishing table 1 15 and a polishing head 1 14 that holds the semiconductor wafer and presses it against the polishing table.
- the polishing table 1 1 5 is connected to a motor and a polishing cloth is pasted on the upper surface thereof.
- the polishing head 1 14 is equipped with a motor for rotation and a cylinder for raising and lowering, and can be raised and lowered and can be rotated around its axis.
- Abrasive liquid containing abrasive is supplied onto the polishing table 1 1 5 from the slurry supply nozzle 1 1 6. Yes.
- the semiconductor wafer is supplied to the polishing mechanism by taking out the semiconductor wafer placed on the wafer cassette 17 by the wafer transfer robot 15 1 and passing it to the first temporary placement table 1 1 1, which includes a wafer reversing mechanism. Invert the semiconductor wafer with the wafer transfer robot 1 1 2 and pass it to the second temporary table 1 1 3 with the polishing surface facing down. Thereafter, the polishing head 1 1 4 is rotated, and the semiconductor wafer is transferred to the polishing head.
- the semiconductor wafer held by the polishing head 1 1 4 and polished against the polishing table 1 1 5 is polished on the second temporary placement table 1 1 while being held on the polishing head 1 1 4 after polishing. It is conveyed up to 3. Then, the semiconductor wafer is detached from the polishing head 1 1 4 and placed on the second temporary placing table 1 1 3. Next, the wafer is transferred to the abrasive metal contamination cleaning unit 12 after being reversed by the wafer transfer robot 16 1 having the wafer reversing mechanism.
- the abrasive metal contamination cleaning unit 1 2 includes an abrasive metal contamination cleaning chamber 1 2 1 for cleaning semiconductor wafer abrasive metal contamination and a spin drying chamber 1 2 4 for rinsing and drying semiconductor wafers. Yes.
- the abrasive metal contamination cleaning chamber 1 2 1 while holding the outer periphery of the semiconductor wafer and rotating it, while cleaning liquid is supplied from the cleaning chemical supply nozzle 1 2 2 a, the sponge roller 1 2 3 is pressed and cleaned. I do.
- the semiconductor wafer after the abrasive metal contamination cleaning is transferred to the spin drying chamber 1 2 4 by the wafer transfer robot 16 1.
- the spin drying chamber 1 2 4 while holding and rotating the outer periphery of the semiconductor wafer, pure water is supplied from the rinsing liquid supply nozzle 1 2 2 b to perform rinsing, and then the semiconductor wafer is rotated at high speed. Perform spin drying.
- the semiconductor wafer that has been subjected to the cleaning and drying of the abrasive metal contamination is again transferred to the organic solvent cleaning section 13 by the wafer transfer robot 16 1.
- Organic solvent washing unit 1 3 is provided with an organic solvent washing chamber one 1 3 1 for organic solvent washing of a semiconductor wafer, a spin drying Cham one 1 3 4 for drying the semiconductor wafer.
- the organic solvent cleaning chamber 1 3 1 while holding the outer periphery of the semiconductor wafer and rotating, while supplying the organic solvent from the organic solvent liquid supply nozzle 1 3 2 a, press the sponge roller 1 3 3 for cleaning I do.
- the semiconductor wafer after the organic solvent cleaning is transferred to the spin drying chamber 1 3 4 by the wafer transfer robot 16 1.
- the organic solvent liquid supply nozzle 1 3 2 b supplies an organic solvent for rinsing, and then rinses. Spin drying by rotating the semiconductor wafer at high speed.
- the semiconductor wafers that have been cleaned and dried with the organic solvent are again transferred to the wafer heat treatment unit 14 by the wafer transfer robot, 16 1.
- Wafer heat treatment unit 1 4 introduces inert gas into heating mechanism 1 4 2 for heating semiconductor wafer, exhaust line 1 4 3 for exhausting wafer heating chamber 1 4 1, and wafer heating chamber 1 4 1 It consists of a wafer heating chamber 1 4 1 equipped with a gas introduction line 1 4 4.
- the wafer heating chamber 14 1 the wafer is transferred to and held on the wafer holder by the wafer transfer robot 1 6 1, then the wafer heating chamber 1 4 1 is closed, and the wafer is heated by the vacuum pump via the exhaust line 1 4 3. Reduce the pressure in the chamber 1 4 1.
- an inert gas is introduced into the wafer heating chamber 1 4 1 through the gas introduction line 1 4 4, and the semiconductor wafer is heated by the heating mechanism 1 4 2.
- the semiconductor wafer that has been subjected to the heat treatment is again stored in the wafer cassette 17 by the wafer transfer robot 15 1.
- FIG. 3 shows a method for manufacturing a semiconductor device according to an embodiment of the present invention.
- the semiconductor manufacturing process is started, first, in step S 2 0 0 ⁇ , the next step S 2 0; Select an appropriate process from S 2 0 4 and proceed to any step.
- step S 2 0 1 is an oxidation process for oxidizing the surface of the wafer.
- Step S 2 02 is a C V D process for forming an insulating film or a dielectric film on the wafer surface by C V D or the like.
- Step S 203 is an electrode forming process for forming electrodes on the wafer by vapor deposition or the like.
- Step S 2 0 4 is an ion implantation process for implanting ions into the wafer.
- Step S 2 0 5 is a CMP process.
- planarization of an interlayer insulating film, polishing of a metal film on the surface of a semiconductor device, formation of a damascene by polishing of a dielectric film, and the like are performed by the polishing apparatus according to the present invention.
- Step S 2 0 6 is about the same as photolithographer.
- the resist is applied to the wafer, the circuit pattern is printed on the wafer by exposure using an exposure apparatus, and the exposed wafer is developed. Further, in the next step S 2 07, the portion other than the developed resist image is etched. This is an etching process that removes resist that is no longer needed after etching.
- step S 2 0 8 it is determined whether all necessary processes have been completed. If not, the process returns to step S 2 0 0 and the previous step is repeated to form a circuit pattern on the wafer. Is done. If it is determined in step S 2 0 8 that all processes have been completed, the process ends.
- the CMP polishing method according to the present invention since the CMP polishing method according to the present invention is used in the CMP process, the leakage current density between wirings can be reduced, and a semiconductor device with higher performance can be manufactured. Can do.
- Hydroxide containing a surfactant which is commonly referred to as a particle contamination removal cleaning solution for post-CMP cleaning of a substrate having an interlayer insulating film 3 using a non-periodic silica film as a hydrophobic porous material
- the slurry and polishing residue were removed by immersion in an aqueous solution of trimethylammonium for 1 minute. Thereafter, the following processing was performed.
- the substrate was immersed in an ethanol solution, which is a solution containing an organic solvent, for 8 minutes to remove the organic matter that had entered the interlayer insulating film 3, and then the substrate surface was dried by dry nitrogen gas blowing.
- an ethanol solution which is a solution containing an organic solvent
- the substrate was immersed in an ethanol solution, which is a solution containing an organic solvent, for 8 minutes to remove the organic matter that had entered the interlayer insulating film 3, and then the substrate surface was dried by dry nitrogen gas blowing. After that, it was placed in a 665 Pa He atmosphere and heat-treated at 380 ° C. for 5 minutes.
- an ethanol solution which is a solution containing an organic solvent
- the substrate was cleaned by immersing it in pure water for 8 minutes, and then the substrate surface was dried with a dry nitrogen gas process (the same method as the conventional method).
- FIG. 4 shows the leakage current density when a 1 MVZcm electric field is applied to the substrates obtained by the processing of each example and comparative example.
- the reference (Ref. L) is the leakage current density after immersion in CMP polishing and before immersion in a trimethylammonium hydroxide aqueous solution containing a surfactant.
- Example A In the state where there is a reference, although the leakage current density is suppressed et resulting et low, in Comparative Example A, the leakage current density is increased to the extent 10- 7 [A / cm 2] . This is because the organic substance in the aqueous solution of trimethylammonium hydroxide containing the surfactant soaked into the porous interlayer insulating film.
- Example A 1 in the embodiment A 2, becomes leakage current density is 10- 8 [A Zcm 2] degrees, which is about 1 Z 1 0 Comparative Example. Further, in Example A 3, the leakage current becomes 10- 9 [A / cm 2] degree, is improved to about 1/100 of the comparative example.
- a substrate having an interlayer insulating film 3 using a silica film having a periodic structure as a hydrophobicized porous material is generally referred to as a particle contamination removing cleaning liquid for post-CMP cleaning, and includes a surfactant.
- Trimethylammonium hydroxide The slurry and polishing residue were removed by immersing in an aqueous solution of nitrogen for 1 minute. After that, the following processing was performed.
- Example B 1 Same treatment as Example A 1
- Example B 2 Same treatment as Example A 2
- Example B 3 Same treatment as Example A 3
- FIG. 5 shows the leakage current density when applying an electric field of 1 MV / cm 2 on the substrates obtained by the processing of each example and comparative example.
- the reference (Ref. 2) is the leakage current density after the CMP polishing and before being immersed in a trimethylammonium hydroxide aqueous solution containing a surfactant.
- Example B l in Examples B 2, becomes leakage current density is 10- 7 [A / cm 2] degrees, which is about 1Z10 comparative example. Further, in the actual ⁇ Example B 3, the leakage current becomes 10- 9 [A / cm 2] degree, is improved to about 1 Z1000 comparative example.
- Fig. 6 shows the results when a non-periodic silica film is used as the interlayer insulating film 3
- Fig. 7 shows the results when a periodic structure siri-force film is used.
- the reference and comparative examples are the same as in Examples A and B.
- Fig. 6 in the case of an ethanol solution, if the concentration is 50% or more, the leakage current is 1 no. Can be said to be effective.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US11/795,697 US8241426B2 (en) | 2005-01-21 | 2005-12-21 | CMP polishing method, CMP polishing apparatus, and process for producing semiconductor device |
EP05822747A EP1852898A4 (en) | 2005-01-21 | 2005-12-21 | CMP POLISHING METHOD, CMP POLISHING DEVICE AND PROCESS FOR MANUFACTURING A SEMICONDUCTOR CONSTRUCTION ELEMENT |
US13/545,359 US20120315831A1 (en) | 2005-01-21 | 2012-07-10 | CMP Polishing Method, CMP Polishing Apparatus, and Process for Producing Semiconductor Device |
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JP2005013734A JP4876215B2 (ja) | 2005-01-21 | 2005-01-21 | Cmp研磨方法、cmp研磨装置、及び半導体デバイスの製造方法 |
JP2005-013734 | 2005-01-21 |
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US13/545,359 Division US20120315831A1 (en) | 2005-01-21 | 2012-07-10 | CMP Polishing Method, CMP Polishing Apparatus, and Process for Producing Semiconductor Device |
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WO2006077730A1 true WO2006077730A1 (ja) | 2006-07-27 |
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US (2) | US8241426B2 (ja) |
EP (1) | EP1852898A4 (ja) |
JP (1) | JP4876215B2 (ja) |
KR (2) | KR100893116B1 (ja) |
CN (1) | CN100472728C (ja) |
TW (1) | TWI386281B (ja) |
WO (1) | WO2006077730A1 (ja) |
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US8021490B2 (en) * | 2007-01-04 | 2011-09-20 | Eastman Chemical Company | Substrate cleaning processes through the use of solvents and systems |
JP5435734B2 (ja) * | 2010-05-27 | 2014-03-05 | 富士フイルム株式会社 | 鏡枠部品、レンズ組立体、撮像装置、および鏡枠部品の製造方法 |
CN102489474B (zh) * | 2011-12-15 | 2016-01-13 | 北京石油化工学院 | 除尘装置及除尘式结构 |
JP6253089B2 (ja) * | 2013-12-10 | 2017-12-27 | 株式会社ディスコ | 研削装置 |
US11676827B2 (en) * | 2016-03-08 | 2023-06-13 | Ebara Corporation | Substrate cleaning apparatus, substrate cleaning method, substrate processing apparatus, and substrate drying apparatus |
US20210210353A1 (en) * | 2020-01-07 | 2021-07-08 | Xia Tai Xin Semiconductor (Qing Dao) Ltd. | Method of processing substrate having polysilicon layer and system thereof |
CN114425534B (zh) * | 2021-12-13 | 2024-04-16 | 金华博蓝特新材料有限公司 | 一种在蓝宝石衬底铜抛后清洗的方法 |
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- 2005-12-21 KR KR1020077014161A patent/KR100893116B1/ko active IP Right Grant
- 2005-12-21 KR KR1020087014014A patent/KR20080058510A/ko not_active Application Discontinuation
- 2005-12-21 CN CNB2005800468330A patent/CN100472728C/zh active Active
- 2005-12-21 EP EP05822747A patent/EP1852898A4/en not_active Withdrawn
- 2005-12-21 WO PCT/JP2005/024001 patent/WO2006077730A1/ja active Application Filing
- 2005-12-21 US US11/795,697 patent/US8241426B2/en active Active
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Also Published As
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CN100472728C (zh) | 2009-03-25 |
US20090047785A1 (en) | 2009-02-19 |
KR20080058510A (ko) | 2008-06-25 |
EP1852898A4 (en) | 2009-07-15 |
US8241426B2 (en) | 2012-08-14 |
US20120315831A1 (en) | 2012-12-13 |
JP4876215B2 (ja) | 2012-02-15 |
KR20070095297A (ko) | 2007-09-28 |
TW200633813A (en) | 2006-10-01 |
EP1852898A1 (en) | 2007-11-07 |
TWI386281B (zh) | 2013-02-21 |
JP2006203027A (ja) | 2006-08-03 |
KR100893116B1 (ko) | 2009-04-14 |
CN101107697A (zh) | 2008-01-16 |
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