WO2015166826A1 - 半導体素子の洗浄液及び洗浄方法 - Google Patents
半導体素子の洗浄液及び洗浄方法 Download PDFInfo
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- WO2015166826A1 WO2015166826A1 PCT/JP2015/061948 JP2015061948W WO2015166826A1 WO 2015166826 A1 WO2015166826 A1 WO 2015166826A1 JP 2015061948 W JP2015061948 W JP 2015061948W WO 2015166826 A1 WO2015166826 A1 WO 2015166826A1
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- WIPO (PCT)
- Prior art keywords
- mass
- cesium
- potassium
- hydroxide
- sodium
- Prior art date
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- 238000004140 cleaning Methods 0.000 title claims abstract description 111
- 239000007788 liquid Substances 0.000 title claims abstract description 58
- 239000004065 semiconductor Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001312 dry etching Methods 0.000 claims abstract description 64
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 56
- 239000010941 cobalt Substances 0.000 claims abstract description 56
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 56
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 51
- 239000010937 tungsten Substances 0.000 claims abstract description 51
- 230000004888 barrier function Effects 0.000 claims abstract description 50
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910000531 Co alloy Inorganic materials 0.000 claims abstract description 23
- 239000003960 organic solvent Substances 0.000 claims abstract description 19
- 125000001453 quaternary ammonium group Chemical group 0.000 claims abstract description 19
- 239000000908 ammonium hydroxide Substances 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 54
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 32
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 235000011118 potassium hydroxide Nutrition 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 15
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 15
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 15
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- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 15
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- 150000001339 alkali metal compounds Chemical class 0.000 claims description 14
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 claims description 13
- 235000011187 glycerol Nutrition 0.000 claims description 12
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 12
- DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 claims description 10
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 10
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 claims description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 0.000 claims description 10
- NLSCHDZTHVNDCP-UHFFFAOYSA-N caesium nitrate Chemical compound [Cs+].[O-][N+]([O-])=O NLSCHDZTHVNDCP-UHFFFAOYSA-N 0.000 claims description 10
- FLJPGEWQYJVDPF-UHFFFAOYSA-L caesium sulfate Chemical compound [Cs+].[Cs+].[O-]S([O-])(=O)=O FLJPGEWQYJVDPF-UHFFFAOYSA-L 0.000 claims description 10
- XLLIQLLCWZCATF-UHFFFAOYSA-N ethylene glycol monomethyl ether acetate Natural products COCCOC(C)=O XLLIQLLCWZCATF-UHFFFAOYSA-N 0.000 claims description 10
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 claims description 10
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 claims description 10
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 10
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 claims description 10
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 10
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 10
- HHVIBTZHLRERCL-UHFFFAOYSA-N sulfonyldimethane Chemical compound CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 claims description 10
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 7
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 6
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 claims description 6
- 229940075557 diethylene glycol monoethyl ether Drugs 0.000 claims description 6
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 6
- 235000011181 potassium carbonates Nutrition 0.000 claims description 6
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 6
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 6
- 235000011151 potassium sulphates Nutrition 0.000 claims description 6
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 claims description 6
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 claims description 6
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 claims description 5
- QWOZZTWBWQMEPD-UHFFFAOYSA-N 1-(2-ethoxypropoxy)propan-2-ol Chemical compound CCOC(C)COCC(C)O QWOZZTWBWQMEPD-UHFFFAOYSA-N 0.000 claims description 5
- ZFPGARUNNKGOBB-UHFFFAOYSA-N 1-Ethyl-2-pyrrolidinone Chemical compound CCN1CCCC1=O ZFPGARUNNKGOBB-UHFFFAOYSA-N 0.000 claims description 5
- JOLQKTGDSGKSKJ-UHFFFAOYSA-N 1-ethoxypropan-2-ol Chemical compound CCOCC(C)O JOLQKTGDSGKSKJ-UHFFFAOYSA-N 0.000 claims description 5
- XXXFZKQPYACQLD-UHFFFAOYSA-N 2-(2-hydroxyethoxy)ethyl acetate Chemical compound CC(=O)OCCOCCO XXXFZKQPYACQLD-UHFFFAOYSA-N 0.000 claims description 5
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 claims description 5
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- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
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- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical compound CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 claims description 4
- LYQFWZFBNBDLEO-UHFFFAOYSA-M caesium bromide Chemical compound [Br-].[Cs+] LYQFWZFBNBDLEO-UHFFFAOYSA-M 0.000 claims description 4
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- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- TYOXIFXYEIILLY-UHFFFAOYSA-N 5-methyl-2-phenyl-1h-imidazole Chemical compound N1C(C)=CN=C1C1=CC=CC=C1 TYOXIFXYEIILLY-UHFFFAOYSA-N 0.000 description 1
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- SNQGIBGTSZUGLE-UHFFFAOYSA-N COC(C)COC(C)CO.C(CCC)OCC(C)O Chemical compound COC(C)COC(C)CO.C(CCC)OCC(C)O SNQGIBGTSZUGLE-UHFFFAOYSA-N 0.000 description 1
- 244000132059 Carica parviflora Species 0.000 description 1
- 235000014653 Carica parviflora Nutrition 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
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- 239000005977 Ethylene Substances 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
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- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
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- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
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- -1 indium-aluminum-arsenic Chemical compound 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
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- 239000011810 insulating material Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 1
- TWLXDPFBEPBAQB-UHFFFAOYSA-N orthoperiodic acid Chemical compound OI(O)(O)(O)(O)=O TWLXDPFBEPBAQB-UHFFFAOYSA-N 0.000 description 1
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- BPUBBGLMJRNUCC-UHFFFAOYSA-N oxygen(2-);tantalum(5+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ta+5].[Ta+5] BPUBBGLMJRNUCC-UHFFFAOYSA-N 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 125000003226 pyrazolyl group Chemical group 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229910001936 tantalum oxide Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- MAKDTFFYCIMFQP-UHFFFAOYSA-N titanium tungsten Chemical compound [Ti].[W] MAKDTFFYCIMFQP-UHFFFAOYSA-N 0.000 description 1
- 150000003852 triazoles Chemical group 0.000 description 1
- ZMANZCXQSJIPKH-UHFFFAOYSA-O triethylammonium ion Chemical compound CC[NH+](CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-O 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3947—Liquid 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
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/02—Inorganic compounds
- C11D7/04—Water-soluble compounds
- C11D7/06—Hydroxides
-
- 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
- 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
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- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
- C11D7/105—Nitrates; Nitrites
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- 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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- C11D7/04—Water-soluble compounds
- C11D7/10—Salts
- C11D7/12—Carbonates bicarbonates
-
- 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
- C11D7/22—Organic compounds
- C11D7/32—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
- C11D7/22—Organic compounds
- C11D7/32—Organic compounds containing nitrogen
- C11D7/3209—Amines or imines with one to four nitrogen atoms; Quaternized amines
-
- 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
-
- 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
-
- 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
- C11D7/5009—Organic solvents containing phosphorus, sulfur or silicon, e.g. dimethylsulfoxide
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
-
- 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
-
- 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
-
- 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
-
- 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
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/033—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers
- H01L21/0334—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/0337—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising inorganic layers characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/3065—Plasma etching; Reactive-ion etching
-
- 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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table 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
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3085—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by their behaviour during the process, e.g. soluble masks, redeposited masks
-
- 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
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/22—Electronic devices, e.g. PCBs or semiconductors
Definitions
- the present invention suppresses damage to a low dielectric constant film, a wiring material such as tungsten, cobalt, a hard mask, a barrier metal, and a barrier insulating film in a manufacturing process of a semiconductor integrated circuit, and removes a dry etching residue on a surface to be processed.
- the present invention relates to a cleaning liquid and a cleaning method.
- a conductive thin film such as a metal film, which is a conductive wiring material, or an interlayer insulating film for the purpose of insulating between conductive thin films is usually formed on an element such as a silicon wafer.
- a photoresist is uniformly applied to the surface to provide a photosensitive layer, and this is selectively exposed and developed to produce a desired resist pattern.
- the interlayer insulating film is dry-etched to form a desired pattern on the thin film.
- dry etching residue a series of steps of completely removing the resist pattern and the residue generated by the dry etching process (hereinafter referred to as “dry etching residue”) by an ashing method using oxygen plasma or a cleaning method using a cleaning solution is used. Has been taken.
- the conductive wiring material is changed from aluminum to copper having a lower electrical resistance, and the interlayer insulating film is changed from a silicon oxide film to a low dielectric constant film (a film having a relative dielectric constant smaller than 3.
- a “Low-k film” ”) Is underway.
- the miniaturization of wiring proceeds, the current density flowing through the wiring increases, and copper electromigration tends to occur. Therefore, a technique using cobalt as a highly reliable wiring material instead of copper has been proposed.
- tungsten plug A contact plug made of tungsten (hereinafter referred to as “tungsten plug”) is used as a contact plug for connection to the substrate.
- the dry etching residue is removed with oxygen plasma, the low-k film is exposed to oxygen plasma or the like and damaged, resulting in a problem that the electrical characteristics are remarkably deteriorated. Therefore, in the manufacture of a semiconductor device using a low-k film, dry etching residues are removed to the same extent as in the oxygen plasma process while suppressing damage to the low-k film, cobalt, barrier metal, and barrier insulating film. A method is required. Further, since the contact plug is also used in the exposed layer, it is sometimes required to suppress damage to tungsten. In addition, when a hard mask is used, damage to the hard mask must be suppressed.
- Patent Document 1 proposes a wiring formation method using a cleaning liquid containing an inorganic base, a quaternary ammonium hydroxide, an organic solvent, an anticorrosive, and water.
- this cleaning solution cannot sufficiently remove the dry etching residue (see Comparative Example 5 described later).
- Patent Document 2 proposes a wiring formation method using a cleaning liquid containing KOH, quaternary ammonium hydroxide, an organic solvent, pyrazole, and water.
- this cleaning solution cannot sufficiently remove the dry etching residue (see Comparative Example 6 described later).
- Patent Document 3 proposes a cobalt corrosion prevention method using benzotriazole or the like. However, this method cannot sufficiently remove dry etching residues (see Comparative Example 7 described later).
- Patent Document 4 proposes a method for preventing cobalt corrosion using a combination of 5-amino-1H-tetrazole and 1-hydroxybenzotriazole. However, this method cannot sufficiently remove the dry etching residue (see Comparative Example 8 described later).
- Patent Document 5 proposes a wiring formation method using a cleaning liquid containing an oxidizing agent, a quaternary ammonium hydroxide, an alkanolamine, an alkali metal hydroxide, and water.
- this cleaning solution can remove dry etching residues, but cannot suppress damage to the tungsten, cobalt Low-k film and hard mask, and cannot be used for this purpose (Comparative Example 9 described later). reference).
- Patent Document 6 proposes a wiring formation method using a cleaning liquid containing an oxidizing agent, an amine, a quaternary ammonium hydroxide, an alkali metal hydroxide, an organic solvent, and water.
- this cleaning liquid cannot sufficiently suppress damage to tungsten and the hard mask, and cannot be used for this purpose (see Comparative Example 10 described later).
- Patent Document 7 proposes a cobalt corrosion prevention method using copper (II) ions and benzotriazole to form a corrosion prevention film on cobalt.
- the dry etching residue can be removed, but the damage of cobalt cannot be sufficiently suppressed (see Comparative Example 11 described later).
- Patent Document 8 proposes a wiring formation method using a cleaning liquid containing a fluorine compound, a metal corrosion inhibitor, a passivating agent, and water.
- this cleaning liquid cannot sufficiently remove dry etching residues, it cannot be used for this purpose (see Comparative Example 12 described later).
- JP 2011-118101 A International Publication No. 2013-187313 JP 2011-91248 A JP 2012-182158 A JP 2009-75285 A JP 2009-231354 A JP-A-6-81177 JP 2013-533631 A
- the present invention suppresses damage to the low-k film, cobalt or cobalt alloy, tungsten plug, hard mask, barrier metal, and barrier insulating film in the manufacturing process of the semiconductor circuit, and removes the dry etching residue on the surface of the object to be processed.
- An object of the present invention is to provide a cleaning liquid and a cleaning method.
- the present invention is as follows. ⁇ 1> A hard mask pattern is formed on a substrate having a low dielectric constant film and at least one of cobalt, a cobalt alloy, and a tungsten plug, and then using the hard mask pattern as a mask, the hard mask and the low dielectric constant film.
- the alkali metal compound is 0.001 to 20% by mass
- the quaternary ammonium hydroxide is 0.1 to 30% by mass
- the water-soluble organic solvent is 0.01 to 60% by mass.
- the alkali metal compound is sodium hydroxide, sodium sulfate, sodium carbonate, sodium bicarbonate, sodium nitrate, sodium fluoride, sodium chloride, sodium bromide, sodium iodide, potassium hydroxide, potassium sulfate, potassium carbonate.
- the above quaternary ammonium hydroxide is at least one selected from the group consisting of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, and tetrabutylammonium hydroxide, ⁇
- the water-soluble organic solvent is ethanol, 1-propanol, 2-propanol, ethylene glycol, propylene glycol, glycerin, diethylene glycol, dipropylene glycol, sorbitol, xylitol, erythritol, pentaerythritol, ethylene glycol monomethyl ether, ethylene glycol Monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether Dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, diethylene glycol dimethyl ether, dipropylene glycol
- a hard mask pattern is formed on a substrate having a low dielectric constant film and at least one of cobalt, a cobalt alloy, and a tungsten plug, and then using the hard mask pattern as a mask, the hard mask and the low dielectric constant film And a cleaning liquid for cleaning the semiconductor element in which the barrier insulating film has been subjected to the dry etching treatment to remove the dry etching residue, the alkali metal compound being 0.001 to 20% by mass, and the quaternary ammonium hydroxide.
- the cleaning liquid comprising 1 to 30% by mass, water-soluble organic solvent 0.01 to 60% by mass, hydrogen peroxide 0.0001 to 0.1% by mass and water.
- the cleaning liquid is an alkali metal compound 0.001 to 20% by mass, a quaternary ammonium hydroxide 0.1 to 30% by mass, a water-soluble organic solvent 0.01 to 60% by mass, hydrogen peroxide 0.0001.
- the alkali metal compound is sodium hydroxide, sodium sulfate, sodium carbonate, sodium bicarbonate, sodium nitrate, sodium fluoride, sodium chloride, sodium bromide, sodium iodide, potassium hydroxide, potassium sulfate, potassium carbonate.
- the quaternary ammonium hydroxide is at least one selected from the group consisting of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, and tetrabutylammonium hydroxide, ⁇ 6> to ⁇ 10>.
- the water-soluble organic solvent is ethanol, 1-propanol, 2-propanol, ethylene glycol, propylene glycol, glycerin, diethylene glycol, dipropylene glycol, sorbitol, xylitol, erythritol, pentaerythritol, ethylene glycol monomethyl ether, ethylene glycol Monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether Ter, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, diethylene glycol dimethyl ether, dipropylene glycol mono
- the cleaning liquid and the cleaning method of the present invention damage to the low-k film, cobalt or cobalt alloy, tungsten plug, hard mask, barrier metal, and barrier insulating film is suppressed in the manufacturing process of the semiconductor circuit.
- the dry etching residue on the surface of the treatment object can be selectively removed, and a high-precision and high-quality semiconductor element can be manufactured with a high yield.
- FIG. 1 is a schematic cross-sectional view of a structure including a cap metal including a hard mask of a semiconductor element before dry etching residue removal. It is a schematic sectional drawing of the tungsten plug structure of the semiconductor element before dry etching residue removal.
- the cleaning solution for dry etching residue in the present invention is used in the process of manufacturing a semiconductor device, and suppresses damage to cobalt or a cobalt alloy, a tungsten plug, a hard mask, a barrier metal, a barrier insulating film, and a low-k film. Is.
- alkali metal compound used in the present invention examples include sodium hydroxide, sodium sulfate, sodium carbonate, sodium bicarbonate, sodium nitrate, sodium fluoride, sodium chloride, sodium bromide, sodium iodide, potassium hydroxide, potassium sulfate. , Potassium carbonate, potassium bicarbonate, potassium nitrate, potassium fluoride, potassium chloride, potassium bromide, potassium iodide, cesium hydroxide, cesium sulfate, cesium carbonate, cesium bicarbonate, cesium nitrate, cesium fluoride, cesium chloride, odor And cesium iodide and cesium iodide. These alkali metal compounds may be used alone or in combination of two or more.
- the concentration range of the alkali metal compound used in the present invention is 0.001 to 20% by mass, preferably 0.005 to 15% by mass, and particularly preferably 0.01 to 12% by mass. Within the above range, the dry etching residue can be effectively removed. On the other hand, if it is larger than 20% by mass, there is a concern that the Low-k film is damaged.
- the concentration range of the quaternary ammonium hydroxide used in the present invention is 0.1 to 30% by mass, preferably 0.1 to 28% by mass, more preferably 1 to 25% by mass, and particularly preferably 2 to 23% by mass. %. Within the above range, the dry etching residue can be effectively removed.
- water-soluble organic solvent used in the present invention examples include ethanol, 1-propanol, 2-propanol, ethylene glycol, propylene glycol, glycerin, diethylene glycol, dipropylene glycol, sorbitol, xylitol, erythritol, pentaerythritol, ethylene.
- Glycol monomethyl ether ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, Propylene rubber Cole monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, diethylene glycol dimethyl ether, dipropylene glycol dimethyl ether, ethylene glycol monoacetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol Monoacetate, formamide, N, N-dimethylformamide, N, N-diethylformamide, acetamide, N, N-dimethylacet
- the concentration range of the water-soluble organic solvent used in the present invention is 0.01 to 60% by mass, preferably 0.1 to 50% by mass, and particularly preferably 5 to 40% by mass. Within the above range, the dry etching residue can be effectively removed. On the other hand, if it is less than 0.01% by mass, the cobalt may be damaged or foreign matter may be generated on the cobalt after the chemical treatment.
- the concentration range of hydrogen peroxide used in the present invention is 0.0001 to 0.1% by mass, preferably 0.001 to 0.05% by mass, more preferably 0.002 to 0.01% by mass, and still more preferably.
- the upper limit is less than 0.01% by mass, and the upper limit is particularly preferably 0.009% by mass or less. If it is less than 0.0001 mass%, cobalt may be damaged. On the other hand, when the content is larger than 0.1% by mass, the tungsten and the hard mask may be damaged.
- the cleaning liquid of the present invention preferably has no alkanolamine from an economical viewpoint.
- the cleaning liquid of the present invention comprises an alkali metal compound 0.001 to 20% by mass, a quaternary ammonium hydroxide 0.1 to 30% by mass, a water-soluble organic solvent 0.01 to 60% by mass, hydrogen peroxide 0. An embodiment containing only 0001 to 0.1% by mass and water is preferred.
- additives that have been conventionally used in semiconductor cleaning liquids may be blended if desired so long as the object of the present invention is not impaired.
- a metal anticorrosive having a pyridine skeleton, a pyrazole skeleton, a pyrimidine skeleton, an imidazole skeleton, or a triazole skeleton, a chelating agent, a surfactant, an antifoaming agent, or the like can be added.
- the temperature at which the cleaning liquid of the present invention is used is in the range of 10 to 80 ° C., preferably 20 to 70 ° C., and may be appropriately selected depending on the etching conditions and the semiconductor substrate used.
- ultrasonic waves can be used in combination as necessary.
- the time for using the cleaning solution of the present invention is in the range of 0.5 to 60 minutes, preferably 1 to 10 minutes, and may be appropriately selected depending on the etching conditions and the semiconductor substrate used.
- an organic solvent such as alcohol can be used, but rinsing with water is sufficient.
- Semiconductor elements and display elements to which the present invention can be applied include substrate materials such as silicon, amorphous silicon, polysilicon, and glass, insulating materials such as silicon oxide, silicon nitride, silicon carbide, and derivatives thereof, cobalt, cobalt alloys, Materials such as tungsten, titanium-tungsten, compound semiconductors such as gallium-arsenic, gallium-phosphorus, indium-phosphorus, indium-gallium-arsenic, indium-aluminum-arsenic, and oxide semiconductors such as chromium oxide are included.
- hydroxysilsesquioxane (HSQ) -based or methylsilsesoxane (MSQ) -based OCD (trade name, manufactured by Tokyo Ohka Kogyo Co., Ltd.), carbon-doped silicon oxide (SiOC) -based Black Diamond (trade name, manufactured by Applied Materials), Aurora (trade name, manufactured by ASM International), Coral (trade name, manufactured by Novellus Systems), and inorganic Orion (trade name, manufactured by Trikon Tenclogies)
- the Low-k film is not limited to these.
- tantalum, tantalum nitride, titanium, titanium nitride, ruthenium, manganese, magnesium and oxides thereof can be used as a general barrier metal.
- the barrier metal is not limited to these.
- barrier insulating film silicon nitride, silicon carbide, silicon nitride carbide, or the like can be used.
- the barrier insulating film is not limited to these.
- silicon, titanium, aluminum, tantalum oxide, nitride, or carbide can be used as a general hard mask. Two or more kinds of these materials can be laminated and used.
- the hard mask is not limited to these.
- Examples 1 to 34 In the test, a semiconductor element having a cross section of the wiring structure as shown in FIGS. 1 and 2 was used, and the cleaning effect was examined. In order to remove the dry etching residue 1, it was immersed in the cleaning liquid shown in Table 1 at the temperature and time shown in Table 2, and then rinsed with ultrapure water and dried by spraying with dry nitrogen gas. By observing the cleaned semiconductor element with an SEM, the removal state of the dry etching residue 1 (FIGS. 1 and 2), tungsten 3 (FIG. 2), cobalt 4 (FIG. 1), low-k film 2 (FIG. 1). And FIG. 2), the damage of the hard mask 6 (FIG. 1) was determined.
- the semiconductor element shown in FIG. 1 has a configuration in which it is covered with a barrier metal 7 so as to surround a wiring material 8 such as copper and capped with cobalt 4.
- the cleaning liquid 2A of Comparative Example 1 suppresses damage to the low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2B of Comparative Example 2 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2C of Comparative Example 3 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2D of Comparative Example 4 suppresses damage to the low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2E of Comparative Example 5 suppresses damage to the low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning solution 2F of Comparative Example 6 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2G of Comparative Example 7 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2H of Comparative Example 8 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2I of Comparative Example 9 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2J of Comparative Example 10 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2K of Comparative Example 11 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- the cleaning liquid 2L of Comparative Example 12 suppresses damage to the Low-k film, cobalt or cobalt alloy, tungsten, barrier metal, barrier insulating film, and hard mask in the manufacturing process of the semiconductor integrated circuit that is the subject of the present invention. It can be seen that it cannot be used for the purpose of removing the dry etching residue on the surface of the workpiece (Table 4).
- KOH potassium hydroxide
- K 2 SO 4 potassium sulfate
- K 2 CO 3 potassium carbonate
- NaOH Sodium Cs 2 CO 3 hydroxide: cesium
- TMAH tetramethylammonium hydroxide
- TEAH tetraethylammonium hydroxide
- TPAH tetrapropylammonium hydroxide
- Ammonium TBAH Tetrabutylammonium hydroxide
- Removal state I Dry etching residue 1 removal state Damage
- II Tungsten 3 damage Damage
- III Cobalt 4 damage Damage
- IV Low-k film 2 damage Damage
- V Hard mask 6 damage
- Removal state I Dry etching residue 1 removal state Damage
- II Tungsten 3 damage Damage
- III Cobalt 4 damage Damage
- IV Low-k film 2 damage Damage
- V Hard mask 6 damage
- the cleaning liquid and the cleaning method of the present invention damage to the low-k film, cobalt or cobalt alloy, tungsten plug, hard mask, barrier metal, and barrier insulating film is suppressed in the manufacturing process of the semiconductor circuit. It is possible to remove the dry etching residue on the surface of the processing object, and it is possible to manufacture high-precision and high-quality semiconductor elements with a high yield, which is industrially useful.
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Abstract
Description
即ち、本発明は以下の通りである。
<1> 低誘電率膜と、コバルト、コバルト合金及びタングステンプラグの少なくとも1種とを有する基板上に、ハードマスクパターンを形成し、次いでこのハードマスクパターンをマスクとして、ハードマスク、低誘電率膜及びバリア絶縁膜にドライエッチング処理を施した半導体素子に、アルカリ金属化合物0.001~20質量%、4級アンモニウム水酸化物0.1~30質量%、水溶性有機溶媒0.01~60質量%、過酸化水素0.0001~0.1質量%および水を含む洗浄液を用いて、ドライエッチング残渣を除去することを特徴とする半導体素子の洗浄方法である。
<2> 前記アルカリ金属化合物が、水酸化ナトリウム、硫酸ナトリウム、炭酸ナトリウム、炭酸水素ナトリウム、硝酸ナトリウム、フッ化ナトリウム、塩化ナトリウム、臭化ナトリウム、ヨウ化ナトリウム、水酸化カリウム、硫酸カリウム、炭酸カリウム、炭酸水素カリウム、硝酸カリウム、フッ化カリウム、塩化カリウム、臭化カリウム、ヨウ化カリウム、水酸化セシウム、硫酸セシウム、炭酸セシウム、炭酸水素セシウム、硝酸セシウム、フッ化セシウム、塩化セシウム、臭化セシウム、およびヨウ化セシウムからなる群より選ばれる少なくとも1種以上である、上記<1>に記載の洗浄方法である。
<3> 前記4級アンモニウム水酸化物が、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、水酸化テトラプロピルアンモニウム、および水酸化テトラブチルアンモニウムからなる群より選ばれる少なくとも1種以上である、上記<1>または<2>に記載の洗浄方法である。
<4> 前記水溶性有機溶媒が、エタノール、1-プロパノール、2-プロパノール、エチレングリコール、プロピレングリコール、グリセリン、ジエチレングリコール、ジプロピレングリコール、ソルビトール、キシリトール、エリトリトール、ペンタエリトリトール、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノブチルエーテル、トリエチレングリコール、テトラエチレングリコール、ポリエチレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノブチルエーテル、ジエチレングリコールジメチルエーテル、ジプロピレングリコールジメチルエーテル、エチレングリコールモノアセテート、エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノアセテート、ホルムアミド、N,N-ジメチルホルムアミド、N,N-ジエチルホルムアミド、アセトアミド、N,N-ジメチルアセトアミド、N,N-ジエチルアセトアミド、N-メチルピロリドン、N-エチルピロリドン、ジメチルスルホン、ジメチルスルホキシド、1,3-ジメチル-2-イミダゾリジノン、およびスルホランからなる群より選ばれる少なくとも1種以上である、上記<1>から<3>のいずれかに記載の洗浄方法である。
<5> 上記<1>から<4>のいずれかに記載の洗浄方法により製造された基板である。
<6> 低誘電率膜と、コバルト、コバルト合金及びタングステンプラグの少なくとも1種とを有する基板上に、ハードマスクパターンを形成し、次いでこのハードマスクパターンをマスクとして、ハードマスク、低誘電率膜及びバリア絶縁膜にドライエッチング処理を施した半導体素子を洗浄して、ドライエッチング残渣を除去するための洗浄液であって、アルカリ金属化合物0.001~20質量%、4級アンモニウム水酸化物0.1~30質量%、水溶性有機溶媒0.01~60質量%、過酸化水素0.0001~0.1質量%および水を含む、前記洗浄液である。
<7> 前記洗浄液がアルカノールアミンを含まない、上記<6>に記載の洗浄液である。
<8> 前記洗浄液が、アルカリ金属化合物0.001~20質量%、4級アンモニウム水酸化物0.1~30質量%、水溶性有機溶媒0.01~60質量%、過酸化水素0.0001~0.1質量%および水のみを含む、上記<6>または<7>に記載の洗浄液である。
<9> 前記洗浄液中における過酸化水素の含有量が、0.0001質量%以上0.01質量%未満である、上記<6>から<8>のいずれかに記載の洗浄液である。
<10> 前記アルカリ金属化合物が、水酸化ナトリウム、硫酸ナトリウム、炭酸ナトリウム、炭酸水素ナトリウム、硝酸ナトリウム、フッ化ナトリウム、塩化ナトリウム、臭化ナトリウム、ヨウ化ナトリウム、水酸化カリウム、硫酸カリウム、炭酸カリウム、炭酸水素カリウム、硝酸カリウム、フッ化カリウム、塩化カリウム、臭化カリウム、ヨウ化カリウム、水酸化セシウム、硫酸セシウム、炭酸セシウム、炭酸水素セシウム、硝酸セシウム、フッ化セシウム、塩化セシウム、臭化セシウム、およびヨウ化セシウムからなる群より選ばれる少なくとも1種以上である、上記<6>から<9>のいずれかに記載の洗浄液である。
<11> 前記4級アンモニウム水酸化物が、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、水酸化テトラプロピルアンモニウム、および水酸化テトラブチルアンモニウムからなる群より選ばれる少なくとも1種以上である、上記<6>から<10>のいずれかに記載の洗浄液である。
<12> 前記水溶性有機溶媒が、エタノール、1-プロパノール、2-プロパノール、エチレングリコール、プロピレングリコール、グリセリン、ジエチレングリコール、ジプロピレングリコール、ソルビトール、キシリトール、エリトリトール、ペンタエリトリトール、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノブチルエーテル、トリエチレングリコール、テトラエチレングリコール、ポリエチレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノブチルエーテル、ジエチレングリコールジメチルエーテル、ジプロピレングリコールジメチルエーテル、エチレングリコールモノアセテート、エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノアセテート、ホルムアミド、N,N-ジメチルホルムアミド、N,N-ジエチルホルムアミド、アセトアミド、N,N-ジメチルアセトアミド、N,N-ジエチルアセトアミド、N-メチルピロリドン、N-エチルピロリドン、ジメチルスルホン、ジメチルスルホキシド、1,3-ジメチル-2-イミダゾリジノン、およびスルホランからなる群より選ばれる少なくとも1種以上である、上記<6>から<11>のいずれかに記載の洗浄液である。
また、本発明の洗浄液は、アルカリ金属化合物0.001~20質量%、4級アンモニウム水酸化物0.1~30質量%、水溶性有機溶媒0.01~60質量%、過酸化水素0.0001~0.1質量%および水のみを含む態様が好ましい。
本発明の洗浄方法は、必要に応じて超音波を併用することができる。
本発明の洗浄液を使用する時間は0.5~60分、好ましくは1~10分の範囲であり、エッチングの条件や使用される半導体基体により適宜選択すればよい。
本発明の洗浄液を使用した後のリンス液としては、アルコールのような有機溶剤を使用することもできるが、水でリンスするだけでも十分である。
株式会社日立ハイテクノロジーズ社製、超高分解能電界放出形走査電子顕微鏡SU9000を用い、倍率100000倍、電圧2Vで観察した。
判定;
I. ドライエッチング残渣の除去状態
E:ドライエッチング残渣が完全に除去された。
P:ドライエッチング残渣の除去が不十分であった。
E判定を合格とした。
II. タングステンのダメージ
E:洗浄前と比べてタングステンに変化が見られなかった。
G:タングステンの表面に少し荒れが見られた。
P:タングステンに大きな穴が見られた。
EおよびG判定を合格とした。
III. コバルトのダメージ
E:洗浄前と比べてコバルトに変化が見られなかった。
G:洗浄前と比べてコバルトに僅かに変化が見られた。
P:洗浄前と比べてコバルトに変化が見られた。
EおよびG判定を合格とした。
IV. Low-k膜のダメージ
E:洗浄前と比べてLow-k膜に変化が見られなかった。
G:Low-k膜がわずかにくぼんでいた。
P:Low-k膜が大きくくぼんでいた。
EおよびG判定を合格とした。
V. ハードマスクのダメージ
E:洗浄前と比べてハードマスクに変化が見られなかった。
P:ハードマスクに剥がれまたは形状の変化が見られた。
E判定を合格とした。
試験には、図1と図2に示したような配線構造の断面を有する半導体素子を使用し、洗浄効果を調べた。ドライエッチング残渣1を除去するため、表1に記した洗浄液に表2に示した温度、時間で浸漬し、その後、超純水によるリンス、乾燥窒素ガス噴射による乾燥を行った。洗浄後の半導体素子をSEMで観察することにより、ドライエッチング残渣1(図1と図2)の除去状態とタングステン3(図2)、コバルト4(図1)、Low-k膜2(図1と図2)、ハードマスク6(図1)のダメージを判断した。なお、図1に示す半導体素子は、銅などの配線材料8を囲むようにバリアメタル7で覆い、コバルト4でキャップした構成となっている。
水酸化テトラメチルアンモニウム16.5質量%、グリセリン30質量%、過酸化水素0.009質量%、及び水53.491質量%を含む水溶液(表3、洗浄液2A)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できなかったものの、Low-k膜2(図1と図2)、ハードマスク6(図1)、コバルト4(図1)及びタングステン3(図2)のダメージは防いだ。よって、比較例1の洗浄液2Aは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム1.5質量%、グリセリン30質量%、過酸化水素0.009質量%、及び水68.491質量%を含む水溶液(表3、洗浄液2B)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できなかったものの、Low-k膜2(図1と図2)、ハードマスク6(図1)、コバルト4(図1)及びタングステン3(図2)のダメージは防いだ。よって、比較例2の洗浄液2Bは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム1.5質量%、水酸化テトラメチルアンモニウム16.5質量%、過酸化水素0.009質量%、及び水81.991質量%を含む水溶液(表3、洗浄液2C)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できた。Low-k膜2(図1と図2)、ハードマスク6(図1)及びタングステン3(図2)のダメージは防いだものの、薬液処理後にコバルト4上に異物の発生が見られた。よって、比較例3の洗浄液2Cは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム1.5質量%、水酸化テトラメチルアンモニウム16.5質量%、グリセリン30質量%、及び水52質量%を含む水溶液(表3、洗浄液2D)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できなかった。Low-k膜2(図1と図2)、ハードマスク6(図1)及びタングステン3(図2)のダメージは防いだものの、コバルト4(図1)にダメージが見られた。よって、比較例4の洗浄液2Dは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化テトラメチルアンモニウム10質量%、水酸化カリウム0.02質量%、2-フェニル-4-メチルイミダゾール2質量%、ジエチレングリコールモノエチルエーテル20質量%、及び水67.98質量%を含む水溶液(表3、洗浄液2E)(先行技術文献に記載した特許文献1に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できなかった。Low-k膜2(図1と図2)、ハードマスク6(図1)及びタングステン3(図2)のダメージは防いだものの、コバルト4(図1)にダメージが見られた。よって、比較例5の洗浄液2Eは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム0.2質量%、水酸化テトラメチルアンモニウム15質量%、グリセリン30質量%、ピラゾール0.1質量%、及び水54.7質量%を含む水溶液(表3、洗浄液2F)(先行技術文献に記載した特許文献2に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できなかった。Low-k膜2(図1と図2)、ハードマスク6(図1)及びタングステン3(図2)のダメージは防いだものの、コバルト4(図1)にダメージが見られた。よって、比較例6の洗浄液2Fは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム1.5質量%、水酸化テトラメチルアンモニウム16.5質量%、グリセリン30質量%、ベンゾトリアゾール0.1質量%、及び水51.9質量%を含む水溶液(表3、洗浄液2G)(先行技術文献に記載した特許文献3に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できなかった。Low-k膜2(図1と図2)、ハードマスク6(図1)及びタングステン3(図2)のダメージは防いだものの、コバルト4(図1)にダメージが見られた。よって、比較例7の洗浄液2Gは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム1.5質量%、水酸化テトラメチルアンモニウム16.5質量%、グリセリン30質量%、5-アミノ-1H-テトラゾール0.1質量%、1-ヒドロキシベンゾトリアゾール0.1質量%、及び水51.8質量%を含む水溶液(表3、洗浄液2H)(先行技術文献に記載した特許文献4に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できなかった。Low-k膜2(図1と図2)、ハードマスク6(図1)及びタングステン3(図2)のダメージは防いだものの、コバルト4(図1)にダメージが見られた。よって、比較例8の洗浄液2Hは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化テトラメチルアンモニウム12質量%、過酸化水素5質量%、水酸化カリウム2質量%、トリエタノールアミン35質量%、及び水46質量%を含む水溶液(表3、洗浄液2I) (先行技術文献に記載した特許文献5に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できたものの、Low-k膜2(図1と図2)、ハードマスク6(図1)、タングステン3(図2)及びコバルト4(図1)にダメージが見られた。よって、比較例9の洗浄液2Iは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム2.6質量%、過酸化水素0.9質量%、オルト過ヨウ素酸2質量%、エチレンジアミン0.03質量%、ジエチレントリアミン0.01質量%、サーフィノール465 0.02質量%、セチルトリメチルアンモニウムクロリド0.02質量%、N-メチルピロリドン10質量%、及び水84.42質量%を含む水溶液(表3、洗浄液2J)(先行技術文献に記載した特許文献6に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できた。Low-k膜2(図1と図2)とコバルト4(図1)のダメージは防いだものの、タングステン3(図2)とハードマスク6(図1)にダメージが見られた。よって、比較例10の洗浄液2Jは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
水酸化カリウム1.5質量%、水酸化テトラメチルアンモニウム16.5質量%、グリセリン30質量%、ベンゾトリアゾール0.12質量%、硫酸銅質量0.0008質量%、及び水51.879質量%を含む水溶液(表3、洗浄液2K)(先行技術文献に記載した特許文献7に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。ドライエッチング残渣1(図1と図2)は除去できた。Low-k膜2(図1と図2)、ハードマスク6(図1)及びタングステン3(図2)のダメージは防いだものの、コバルト4(図1)にダメージが見られた。よって、比較例11の洗浄液2Kは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
ベンゾトリアゾール0.1質量%、1,2,4-トリアゾール0.1質量%、フッ化アンモニウム5質量%、ホウ酸1質量%、及び水84.42質量%を含む水溶液(表3、洗浄液2L)(先行技術文献に記載した特許文献8に相当)を用いて図1と図2に示した半導体素子を洗浄し、表4に洗浄条件と評価結果を示した。Low-k膜2(図1と図2)、ハードマスク6(図1)、タングステン3(図2)及びコバルト4(図1)のダメージは防いだものの、ドライエッチング残渣1(図1と図2)は除去できなかった。よって、比較例12の洗浄液2Lは、本発明の対象である半導体集積回路の製造工程において、Low-k膜、コバルトあるいはコバルト合金、タングステン、バリアメタル、バリア絶縁膜及びハードマスクのダメージを抑制し、被処理物表面のドライエッチング残渣を除去する目的には使用できないことがわかる(表4)。
KOH:水酸化カリウム
K2SO4:硫酸カリウム
K2CO3:炭酸カリウム
NaOH:水酸化ナトリウム
Cs2CO3:炭酸セシウム
TMAH:水酸化テトラメチルアンモニウム
TEAH:水酸化テトラエチルアンモニウム
TPAH:水酸化テトラプロピルアンモニウム
TBAH:水酸化テトラブチルアンモニウム
ダメージII:タングステン3のダメージ
ダメージIII:コバルト4のダメージ
ダメージIV:Low-k膜2のダメージ
ダメージV:ハードマスク6のダメージ
2:Low-k膜
3:タングステンプラグ
4:コバルト
5:バリア絶縁膜
6:ハードマスク
7:バリアメタル
8:配線材料(銅)
Claims (12)
- 低誘電率膜と、コバルト、コバルト合金及びタングステンプラグの少なくとも1種とを有する基板上に、ハードマスクパターンを形成し、次いでこのハードマスクパターンをマスクとして、ハードマスク、低誘電率膜及びバリア絶縁膜にドライエッチング処理を施した半導体素子に、アルカリ金属化合物0.001~20質量%、4級アンモニウム水酸化物0.1~30質量%、水溶性有機溶媒0.01~60質量%、過酸化水素0.0001~0.1質量%および水を含む洗浄液を用いて、ドライエッチング残渣を除去することを特徴とする半導体素子の洗浄方法。
- 前記アルカリ金属化合物が、水酸化ナトリウム、硫酸ナトリウム、炭酸ナトリウム、炭酸水素ナトリウム、硝酸ナトリウム、フッ化ナトリウム、塩化ナトリウム、臭化ナトリウム、ヨウ化ナトリウム、水酸化カリウム、硫酸カリウム、炭酸カリウム、炭酸水素カリウム、硝酸カリウム、フッ化カリウム、塩化カリウム、臭化カリウム、ヨウ化カリウム、水酸化セシウム、硫酸セシウム、炭酸セシウム、炭酸水素セシウム、硝酸セシウム、フッ化セシウム、塩化セシウム、臭化セシウム、およびヨウ化セシウムからなる群より選ばれる少なくとも1種以上である、請求項1に記載の洗浄方法。
- 前記4級アンモニウム水酸化物が、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、水酸化テトラプロピルアンモニウム、および水酸化テトラブチルアンモニウムからなる群より選ばれる少なくとも1種以上である、請求項1または2に記載の洗浄方法。
- 前記水溶性有機溶媒が、エタノール、1-プロパノール、2-プロパノール、エチレングリコール、プロピレングリコール、グリセリン、ジエチレングリコール、ジプロピレングリコール、ソルビトール、キシリトール、エリトリトール、ペンタエリトリトール、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノブチルエーテル、トリエチレングリコール、テトラエチレングリコール、ポリエチレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノブチルエーテル、ジエチレングリコールジメチルエーテル、ジプロピレングリコールジメチルエーテル、エチレングリコールモノアセテート、エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノアセテート、ホルムアミド、N,N-ジメチルホルムアミド、N,N-ジエチルホルムアミド、アセトアミド、N,N-ジメチルアセトアミド、N,N-ジエチルアセトアミド、N-メチルピロリドン、N-エチルピロリドン、ジメチルスルホン、ジメチルスルホキシド、1,3-ジメチル-2-イミダゾリジノン、およびスルホランからなる群より選ばれる少なくとも1種以上である、請求項1から3のいずれかに記載の洗浄方法。
- 請求項1から4のいずれかに記載の洗浄方法により製造された基板。
- 低誘電率膜と、コバルト、コバルト合金及びタングステンプラグの少なくとも1種とを有する基板上に、ハードマスクパターンを形成し、次いでこのハードマスクパターンをマスクとして、ハードマスク、低誘電率膜及びバリア絶縁膜にドライエッチング処理を施した半導体素子を洗浄して、ドライエッチング残渣を除去するための洗浄液であって、アルカリ金属化合物0.001~20質量%、4級アンモニウム水酸化物0.1~30質量%、水溶性有機溶媒0.01~60質量%、過酸化水素0.0001~0.1質量%および水を含む、前記洗浄液。
- 前記洗浄液がアルカノールアミンを含まない、請求項6に記載の洗浄液。
- 前記洗浄液が、アルカリ金属化合物0.001~20質量%、4級アンモニウム水酸化物0.1~30質量%、水溶性有機溶媒0.01~60質量%、過酸化水素0.0001~0.1質量%および水のみを含む、請求項6または7に記載の洗浄液。
- 前記洗浄液中における過酸化水素の含有量が、0.0001質量%以上0.01質量%未満である、請求項6から8のいずれかに記載の洗浄液。
- 前記アルカリ金属化合物が、水酸化ナトリウム、硫酸ナトリウム、炭酸ナトリウム、炭酸水素ナトリウム、硝酸ナトリウム、フッ化ナトリウム、塩化ナトリウム、臭化ナトリウム、ヨウ化ナトリウム、水酸化カリウム、硫酸カリウム、炭酸カリウム、炭酸水素カリウム、硝酸カリウム、フッ化カリウム、塩化カリウム、臭化カリウム、ヨウ化カリウム、水酸化セシウム、硫酸セシウム、炭酸セシウム、炭酸水素セシウム、硝酸セシウム、フッ化セシウム、塩化セシウム、臭化セシウム、およびヨウ化セシウムからなる群より選ばれる少なくとも1種以上である、請求項6から9のいずれかに記載の洗浄液。
- 前記4級アンモニウム水酸化物が、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、水酸化テトラプロピルアンモニウム、および水酸化テトラブチルアンモニウムからなる群より選ばれる少なくとも1種以上である、請求項6から10のいずれかに記載の洗浄液。
- 前記水溶性有機溶媒が、エタノール、1-プロパノール、2-プロパノール、エチレングリコール、プロピレングリコール、グリセリン、ジエチレングリコール、ジプロピレングリコール、ソルビトール、キシリトール、エリトリトール、ペンタエリトリトール、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールモノブチルエーテル、トリエチレングリコール、テトラエチレングリコール、ポリエチレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノブチルエーテル、ジエチレングリコールジメチルエーテル、ジプロピレングリコールジメチルエーテル、エチレングリコールモノアセテート、エチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノアセテート、ホルムアミド、N,N-ジメチルホルムアミド、N,N-ジエチルホルムアミド、アセトアミド、N,N-ジメチルアセトアミド、N,N-ジエチルアセトアミド、N-メチルピロリドン、N-エチルピロリドン、ジメチルスルホン、ジメチルスルホキシド、1,3-ジメチル-2-イミダゾリジノン、およびスルホランからなる群より選ばれる少なくとも1種以上である、請求項6から11のいずれかに記載の洗浄液。
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