WO2019159749A1 - 撥水性保護膜形成剤、撥水性保護膜形成用薬液、及びウェハの表面処理方法 - Google Patents
撥水性保護膜形成剤、撥水性保護膜形成用薬液、及びウェハの表面処理方法 Download PDFInfo
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- WO2019159749A1 WO2019159749A1 PCT/JP2019/003965 JP2019003965W WO2019159749A1 WO 2019159749 A1 WO2019159749 A1 WO 2019159749A1 JP 2019003965 W JP2019003965 W JP 2019003965W WO 2019159749 A1 WO2019159749 A1 WO 2019159749A1
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- protective film
- water
- repellent protective
- forming agent
- chemical solution
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- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- VLSVVMPLPMNWBH-UHFFFAOYSA-N Dihydro-5-propyl-2(3H)-furanone Chemical compound CCCC1CCC(=O)O1 VLSVVMPLPMNWBH-UHFFFAOYSA-N 0.000 description 1
- AQZGPSLYZOOYQP-UHFFFAOYSA-N Diisoamyl ether Chemical compound CC(C)CCOCCC(C)C AQZGPSLYZOOYQP-UHFFFAOYSA-N 0.000 description 1
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- 235000010643 Leucaena leucocephala Nutrition 0.000 description 1
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- 239000004793 Polystyrene Substances 0.000 description 1
- LINDOXZENKYESA-UHFFFAOYSA-N TMG Natural products CNC(N)=NC LINDOXZENKYESA-UHFFFAOYSA-N 0.000 description 1
- BGNXCDMCOKJUMV-UHFFFAOYSA-N Tert-Butylhydroquinone Chemical compound CC(C)(C)C1=CC(O)=CC=C1O BGNXCDMCOKJUMV-UHFFFAOYSA-N 0.000 description 1
- YFCGDEUVHLPRCZ-UHFFFAOYSA-N [dimethyl(trimethylsilyloxy)silyl]oxy-dimethyl-trimethylsilyloxysilane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C YFCGDEUVHLPRCZ-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- VQPFDLRNOCQMSN-UHFFFAOYSA-N bromosilane Chemical compound Br[SiH3] VQPFDLRNOCQMSN-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 description 1
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
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- 229950005499 carbon tetrachloride Drugs 0.000 description 1
- 239000012986 chain transfer agent Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
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- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
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- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000306 component Substances 0.000 description 1
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- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- FYTRVXSHONWYNE-UHFFFAOYSA-N delta-octanolide Chemical compound CCCC1CCCC(=O)O1 FYTRVXSHONWYNE-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 1
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 1
- UBPGILLNMDGSDS-UHFFFAOYSA-N diethylene glycol diacetate Chemical compound CC(=O)OCCOCCOC(C)=O UBPGILLNMDGSDS-UHFFFAOYSA-N 0.000 description 1
- 229940019778 diethylene glycol diethyl ether Drugs 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- UYAAVKFHBMJOJZ-UHFFFAOYSA-N diimidazo[1,3-b:1',3'-e]pyrazine-5,10-dione Chemical compound O=C1C2=CN=CN2C(=O)C2=CN=CN12 UYAAVKFHBMJOJZ-UHFFFAOYSA-N 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
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- FBZANXDWQAVSTQ-UHFFFAOYSA-N dodecamethylpentasiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C FBZANXDWQAVSTQ-UHFFFAOYSA-N 0.000 description 1
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- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
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- 125000001153 fluoro group Chemical group F* 0.000 description 1
- JBFHTYHTHYHCDJ-UHFFFAOYSA-N gamma-caprolactone Chemical compound CCC1CCC(=O)O1 JBFHTYHTHYHCDJ-UHFFFAOYSA-N 0.000 description 1
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- PHXATPHONSXBIL-JTQLQIEISA-N gamma-undecanolactone Chemical compound CCCCCCC[C@H]1CCC(=O)O1 PHXATPHONSXBIL-JTQLQIEISA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000013773 glyceryl triacetate Nutrition 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- UQEAIHBTYFGYIE-UHFFFAOYSA-N hexamethyldisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)C UQEAIHBTYFGYIE-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-M hexanoate Chemical compound CCCCCC([O-])=O FUZZWVXGSFPDMH-UHFFFAOYSA-M 0.000 description 1
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- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 229960004337 hydroquinone Drugs 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- IDIOJRGTRFRIJL-UHFFFAOYSA-N iodosilane Chemical compound I[SiH3] IDIOJRGTRFRIJL-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 125000002510 isobutoxy group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])O* 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- VKPSKYDESGTTFR-UHFFFAOYSA-N isododecane Natural products CC(C)(C)CC(C)CC(C)(C)C VKPSKYDESGTTFR-UHFFFAOYSA-N 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- SKTCDJAMAYNROS-UHFFFAOYSA-N methoxycyclopentane Chemical compound COC1CCCC1 SKTCDJAMAYNROS-UHFFFAOYSA-N 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001298 n-hexoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000003935 n-pentoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000002560 nitrile group Chemical group 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- ZVEZMVFBMOOHAT-UHFFFAOYSA-N nonane-1-thiol Chemical compound CCCCCCCCCS ZVEZMVFBMOOHAT-UHFFFAOYSA-N 0.000 description 1
- 229940038384 octadecane Drugs 0.000 description 1
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- KZCOBXFFBQJQHH-UHFFFAOYSA-N octane-1-thiol Chemical compound CCCCCCCCS KZCOBXFFBQJQHH-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical compound FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 description 1
- 125000005010 perfluoroalkyl group Chemical group 0.000 description 1
- YVBBRRALBYAZBM-UHFFFAOYSA-N perfluorooctane Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F YVBBRRALBYAZBM-UHFFFAOYSA-N 0.000 description 1
- 239000010702 perfluoropolyether Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 229940116423 propylene glycol diacetate Drugs 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 235000019281 tert-butylhydroquinone Nutrition 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 description 1
- 229960002622 triacetin Drugs 0.000 description 1
- IPBROXKVGHZHJV-UHFFFAOYSA-N tridecane-1-thiol Chemical compound CCCCCCCCCCCCCS IPBROXKVGHZHJV-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
- WGPCZPLRVAWXPW-UHFFFAOYSA-N xi-Dihydro-5-octyl-2(3H)-furanone Chemical compound CCCCCCCCC1CCC(=O)O1 WGPCZPLRVAWXPW-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and 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
- H01L21/02057—Cleaning during device manufacture
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/10—Compounds having one or more C—Si linkages containing nitrogen having a Si-N linkage
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
-
- 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
Definitions
- the present invention relates to a water-repellent protective film forming agent for forming a water-repellent protective film on the surface of a wafer, a chemical solution for forming a water-repellent protective film, and a surface treatment method of a wafer using the liquid agent and the chemical solution. .
- the applicant of the present application is at least an aqueous cleaning liquid as a silicon wafer cleaning agent for improving a cleaning process that easily induces pattern collapse.
- a water-repellent cleaning solution for making at least the recesses of the concavo-convex pattern water-repellent during the cleaning process, and the water-repellent cleaning solution includes a reactive site capable of chemically bonding to Si of the silicon wafer and a hydrophobic group.
- a water-repellent compound, or a water-repellent compound that contains 0.1% by weight or more of the water-repellent compound and an organic solvent with respect to a total amount of 100% by weight of the water-repellent cleaning liquid is included.
- a silicon wafer cleaning agent and a wafer cleaning method using the same are disclosed, and the water-repellent cleaning liquid comprises the following general formulas [A], [B] and [C] as water-repellent compounds. At least one selected from the group is used.
- R 1 , R 2 , and R 3 are each a monovalent organic group containing a hydrocarbon group having 1 to 18 carbon atoms, or carbon A monovalent organic group containing a perfluoroalkyl chain having a number of 1 to 8.
- X represents a chloro group, an isocyanate group, or an alkoxy group
- Y represents 1 of an element bonded to Si that is nitrogen.
- A is an integer of 1 to 3
- b and c are integers of 0 to 2
- the sum of a, b and c is 1 to 3.
- d is an integer of 0 to 2
- e is an integer of 1 to 3.
- the present applicant induces pattern collapse without impairing throughput.
- a protective film forming chemical for forming a water-repellent protective film on the surface of the concavo-convex pattern of the wafer to improve a cleaning process that is easy to perform at least a part of the concavo-convex pattern has silicon
- a chemical solution for forming a water-repellent protective film on at least the concave surface of the concavo-convex pattern at the time of cleaning the wafer including the silicon compound A represented by the following general formula [D] and protons to the silicon compound A
- the total amount of water in the starting material of the chemical solution is equal to the total amount of the raw material.
- R 4 s each independently contain a monovalent organic group containing a hydrocarbon group having 1 to 18 carbon atoms and a fluoroalkyl chain having 1 to 8 carbon atoms.
- Z is at least one group selected from a valent organic group, and Z is independently of each other at least one selected from a halogen group, a monovalent organic group in which the element bonded to Si is oxygen or nitrogen, or a nitrile group
- f is an integer of 1 to 3
- g is an integer of 0 to 2
- the sum of f and g is 3 or less.
- the number of combinations of materials and film configurations of semiconductor wafers has increased as devices have higher performance and higher functionality.
- the circuit pattern of the wafer is composed of various materials such as metal wiring layer, electrode layer, capacitor layer, dielectric layer, device forming layer, etc. ing.
- a suitable chemical solution for forming a water-repellent protective film on the surface of a large number of combinations of semiconductor wafers that will continue to increase in the future and preventing pattern collapse in the cleaning process
- the components of the chemical solution for forming a water repellent protective film may adversely affect the wafer.
- silanes such as chlorosilane, bromosilane, and iodosilane may be adversely affected by chlorine, bromine, and iodine atoms depending on the wafer configuration.
- the water-repellent cleaning liquid of Patent Document 1 can impart excellent water repellency to the surface of a silicon wafer
- a water-repellent cleaning liquid containing a chlorosilane compound as a water-repellent compound as in Example 22 of Patent Document 1 is used.
- chlorine atoms may have an adverse effect. Therefore, it may be desirable that the component forming the water repellent protective film does not contain chlorine atoms.
- the protective film forming chemical solution of Patent Document 2 can impart excellent water repellency to the surface of the wafer containing silicon element, the silicon compound A that forms the protective film and the protective film formation when the chemical solution is prepared It is necessary to accurately weigh and control the concentration of each acid that promotes the above. From the viewpoint of the load of liquid preparation operation and chemical solution concentration management, a water-repellent protective film-forming chemical liquid that does not require a component that promotes the formation of the protective film is desirable.
- the present invention is to form a water-repellent protective film on the surface of a wafer containing silicon element so that the component that forms the water-repellent protective film does not contain chlorine atoms and does not require a component that promotes the formation of the protective film.
- a new water-repellent protective film forming agent hereinafter sometimes simply referred to as “protective film-forming agent” or “agent”
- a novel water-repellent protective film-forming chemical hereinafter simply referred to as “protective film-forming agent”. It is an object of the present invention to provide a surface treatment method of a wafer using the agent in the liquid state or the chemical solution.
- the present invention is a water-repellent protective film forming agent for forming a water-repellent protective film on the surface of a wafer containing silicon element, the agent is a guanidine derivative represented by the following general formula [1], and It is a water-repellent protective film forming agent which is at least one silicon compound selected from the group consisting of amidine derivatives represented by the following general formula [2].
- R 1 is independently of each other a hydrogen atom, —C ⁇ N group, —NO 2 group, and part or all of the hydrogen elements are replaced by fluorine elements.
- the hydrocarbon group may have an oxygen atom and / or a nitrogen atom.
- R 2 is each independently a monovalent hydrocarbon group having 1 to 18 carbon atoms in which some or all of the hydrogen elements may be replaced by fluorine elements, and a is 1 to 3 An integer, b is an integer of 0 to 2, and the sum of a and b is 3. ]
- R 2 is a combination of two methyl groups and one linear alkyl group because the protective film can be formed more uniformly.
- R 1 in the above general formulas [1] and [2] are each independently selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, and an alkoxy group having 1 to 6 carbon atoms. It is preferable that it is a group.
- the compound by-produced when the silicon compound accepts protons is a liquid at 25 ° C. and 1.0 atm.
- the silicon compound is preferably a compound represented by the general formula [1].
- R 1 is all methyl groups
- a is 3
- b is 0, two of the three R 2 are methyl groups
- R 2 is preferably a compound having a monovalent hydrocarbon group having 1 to 18 carbon atoms in which some or all of the hydrogen elements may be replaced by fluorine elements.
- the present invention also provides a chemical solution for forming a water-repellent protective film in which the water-repellent protective film-forming agent described above is dissolved in an organic solvent.
- the concentration of the water repellent protective film forming agent with respect to 100% by mass of the total amount of the water repellent protective film forming agent and the organic solvent is 0.01 to 25% by mass.
- the organic solvent is an aprotic solvent.
- the total amount of water contained in the water-repellent protective film forming agent and the organic solvent before preparing the water-repellent protective film-forming chemical solution is 5000 ppm by mass with respect to the total amount of the water-repellent protective film-forming agent and the organic solvent. The following is preferable.
- the present invention is also a surface treatment method for a wafer containing silicon element, which uses the liquid-state water-repellent protective film forming agent described above.
- the present invention is a surface treatment method for a wafer containing silicon element, using the chemical solution for forming a water repellent protective film according to any one of the above.
- the water-repellent protective film forming agent or the chemical solution for forming a water-repellent protective film of the present invention can form a water-repellent protective film on the surface of a wafer containing silicon element, thereby reducing the capillary force on the concave / convex pattern surface of the wafer.
- the pattern collapse prevention effect is shown.
- the water repellent protective film forming agent or the water repellent protective film forming chemical solution of the present invention it is possible to secure a new choice of the water repellent protective film forming chemical solution for a number of combinations of semiconductor wafers that will continue to increase in the future.
- FIG. 1 is a schematic perspective view of a wafer 1 whose surface is a surface having a fine uneven pattern 2.
- FIG. FIG. 2 shows a part of the a-a ′ cross section in FIG. 1. It is a schematic diagram of the state in which the recessed part 4 hold
- Water-repellent protective film forming agent or chemical solution for forming water-repellent protective film (1) Silicon compound
- the water-repellent protective film-forming agent of the present invention is a guanidine derivative represented by the above general formula [1] and the above general formula. It is at least one silicon compound selected from the group consisting of amidine derivatives represented by [2].
- the R 2 groups in the general formulas [1] and [2] are water-repellent functional groups. Then, the guanidyl group of the guanidine derivative and the amidinyl group of the amidine derivative react with the silanol group on the wafer surface, and the portion having the water-repellent functional group is fixed on the wafer surface, thereby repelling the wafer surface.
- the guanidine derivative represented by the general formula [1] and the amidine derivative represented by the general formula [2] are compounds in a liquid state at 25 ° C. and 1.0 atm.
- Examples of the hydrocarbon group in R 1 include linear or branched groups such as a methyl group, an ethyl group, a propyl group, and a butyl group, and cyclic groups such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group.
- Group, and part or all of the hydrogen elements may be replaced by fluorine elements.
- the hydrocarbon group according to R 1 may have an oxygen atom.
- a linear, branched, or cyclic alkoxy group such as a methoxy group, an ethoxy group, a propoxy group, or a butoxy group can be given.
- the hydrocarbon group may have a nitrogen atom.
- a hydrocarbon group having a primary to tertiary amino group can be mentioned.
- guanidine derivative of the general formula [1] 2-trimethylsilyl-1,1,3,3-tetramethylguanidine, 2-ethyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-diethylmethylsilyl-1,1,3,3-tetramethyl Guanidine, 2-triethylsilyl-1,1,3,3-tetramethylguanidine, 2-propyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-dipropylmethylsilyl-1,1,3 3-tetramethylguanidine, 2-tripropylsilyl-1,1,3,3-tetramethylguanidine, 2-butyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-pentyldimethylsilyl-1, 1,3,3-tetramethylguanidine, 2-hexyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-hept Rud
- guanidine derivatives 2-trifluoropropyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-pentafluorobutyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-heptafluoropentyldimethylsilyl-1, 1,3,3-tetramethylguanidine, 2-nonafluorohexyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-undecafluoroheptyldimethylsilyl-1,1,3,3-tetramethylguanidine 2-tridecafluorooctyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-pentadecafluorononyldimethylsilyl-1,1,3,3-tetramethylguanidine, 2-heptadecafluorodecyldimethyl Silyl-1,1,3,3-tetramethylguanidine, 2-h
- amidine derivative of the above general formula [2] include compounds in which the guanidyl group portion of the compound mentioned as a specific example of the guanidine derivative of the general formula [1] is replaced with an amidinyl group.
- the R 1 groups in the above general formulas [1] and [2] are preferably electron donating groups, and include a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, and a carbon number. A group selected from 1 to 6 alkoxy groups is preferred.
- alkyl group having 1 to 6 carbon atoms include methyl, ethyl, n-propyl, isopropyl, cyclopropyl, n-butyl, isobutyl, sec-butyl, tert, -Butyl group, cyclobutyl group, n-pentyl group, cyclopentyl group, n-hexyl group, cyclohexyl group and the like.
- alkoxy group having 1 to 6 carbon atoms include methoxy group, ethoxy group, n-propyloxy group, isopropyloxy group, n-butyloxy group, isobutyloxy group, sec-butyloxy group, tert- Examples thereof include a butyloxy group, an n-pentyloxy group, and an n-hexyloxy group.
- b is preferably 0 because it is easy to maintain water repellency in the cleaning after the protective film formation described later.
- the by-product compound when the silicon compound accepts protons is a liquid at 25 ° C. and 1.0 atm.
- a silicon compound in which R 1 in the general formula [1] is all a methyl group when accepting a proton, produces 1,1,3,3-tetramethylguanidine which is a liquid at 25 ° C. and 1.0 atm as a by-product. .
- the silicon compound is a compound represented by the general formula [1] from the viewpoint of obtaining a good water repellency imparting effect.
- the silicon compound is a compound in a liquid state at 25 ° C. and 1.0 atm
- a liquid composed only of the silicon compound can be supplied to the wafer surface as a water repellent protective film forming agent.
- the silicon compound in the liquid state can be supplied to the wafer surface by adjusting the viscosity of the agent by adjusting the temperature.
- the silicon compound in the liquid state can be supplied to the wafer surface as a chemical solution dissolved and diluted with an organic solvent.
- the silicon compound is diluted with an organic solvent.
- concentration of the silicon compound is 0.01 to 25% by mass with respect to 100% by mass of the total amount of the silicon compound and the organic solvent, it becomes easy to form a protective film uniformly on the surface of the wafer containing silicon element. Therefore, it is preferable. If it is less than 0.01% by mass, the effect of imparting water repellency tends to be insufficient. Moreover, it is preferable from a cost viewpoint that it is 25 mass% or less. More preferably, it is 0.1 to 15% by mass, and more preferably 0.5 to 10% by mass.
- Examples of the organic solvent contained in the chemical solution for forming a water repellent protective film include hydrocarbons, esters, ethers, ketones, halogen-containing solvents, sulfoxide solvents, lactone solvents, carbonate solvents, and polyhydric alcohols.
- the derivatives those having no OH group, nitrogen element-containing solvents having no NH group, aprotic solvents such as silicone solvents, thiols, or a mixture thereof are preferably used.
- hydrocarbons, esters, ethers, halogen-containing solvents, polyhydric alcohol derivatives having no OH group, or a mixture thereof are used to repel the surface of a wafer containing silicon elements. Since an aqueous protective film can be formed in a short time, it is more preferable.
- hydrocarbons examples include hexane, heptane, octane, nonane, decane, dodecane, isododecane, tetradecane, hexadecane, octadecane, aicosane, cyclohexane, methylcyclohexane, decalin, benzene, toluene, xylene, diethylbenzene, etc.
- esters include ethyl acetate, propyl acetate, butyl acetate, ethyl acetoacetate and the like.
- ethers examples include diethyl ether, dipropyl ether, ethyl butyl ether, dibutyl ether, ethyl amyl ether, diamyl. Ether, methylcyclopentyl ether, ethyl hexyl ether, dihexyl ether, dioctyl ether, diphenyl ether, tetrahydrofuran, dioxane, methyl perfluoropropylene Ether, methyl perfluorobutyl ether, ethyl perfluorobutyl ether, methyl perfluorohexyl ether, ethyl perfluorohexyl ether, etc.
- ketones include acetone, acetylacetone, methyl ethyl ketone, methyl propyl ketone, methyl butyl ketone, cyclohexanone.
- halogen-containing solvent include perfluorocarbons such as perfluorooctane, perfluorononane, perfluorocyclopentane, perfluorocyclohexane, hexafluorobenzene, 1, 1, 1, 3, 3- Hydrofluorocarbons such as pentafluorobutane, octafluorocyclopentane, 2,3-dihydrodecafluoropentane, Zeorora H (manufactured by Nippon Zeon), methyl Hydrofluoroethers such as perfluoroisobutyl ether, methyl perfluorobutyl ether, ethyl perfluorobutyl ether, ethyl perfluoroisobutyl ether
- Examples include chlorofluorocarbon, perfluoroether, perfluoropolyether, etc.
- Examples of the sulfoxide solvent include dimethyl sulfoxide, and examples of the lactone solvent include ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -Hexanolactone, ⁇ -heptanolactone, ⁇ -octanolactone, ⁇ -nonanolactone, ⁇ -decanolactone, ⁇ -undecanolactone, ⁇ -dodecanolactone, ⁇ -valerolactone, ⁇ -hexanolactone, ⁇ - There are octanolactone, ⁇ -nonanolactone, ⁇ -decanolactone, ⁇ -undecanolactone, ⁇ -dodecanolactone, ⁇ -hexanolactone, etc.
- Examples of the carbonate solvents include dimethyl carbonate, ethyl methyl carbonate, diethyl Carbonate, propylene carbonate, etc.
- Examples of derivatives of Cole that do not have an OH group include ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol Diacetate, Diethylene glycol dimethyl ether, Diethylene glycol ethyl methyl ether, Diethylene glycol diethyl ether, Diethylene glycol butyl methyl ether, Diethylene glycol dibutyl ether, Diethylene glycol monomethyl ether acetate, Diethylene glycol monoethyl ether acetate, Diethylene glycol monobutyl Ether acetate, diethylene glycol diacetate, triethylene glycol dimethyl ether, triethylene glycol die
- Examples of the solvent include hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, etc.
- Examples of the thiols include 1-hexanethiol, 2-methyl-1-pentanethiol 3-methyl-1-pentanethiol, 4-methyl-1-pentanethiol, 2,2-dimethyl-1-butanethiol, 3,3-dimethyl-1-butanethiol, 2-ethyl-1-butanethiol, 1-heptanethiol, benzylthiol, 1-octanethiol, 2-ethyl- Examples include 1-hexanethiol, 1-nonanethiol, 1-decanethiol, 1-undecanethiol, 1-dodecanethiol, 1-tridecanethiol, and the like.
- additives such as a polymerization inhibitor, a chain transfer agent, and an antioxidant are used to further improve the stability of the agent or the chemical solution. May be included.
- a polymerization inhibitor such as a chain transfer agent, and an antioxidant.
- an antioxidant such as a polymerization inhibitor, a chain transfer agent, and an antioxidant.
- the above-mentioned additive is preferably a liquid.
- Preferred are -tert-butyl-4-hydroxy-hydrocarbamic acid (manufactured by BASF, Irganox 1135), 6-tert-butyl-2,4-xylenol, and the like.
- the total amount of water contained in the water-repellent protective film forming agent and the organic solvent before the chemical solution is prepared is It is preferable that it is 5000 mass ppm or less with respect to the total amount of a solvent.
- the total amount of moisture exceeds 5000 ppm by mass, the water repellency imparting effect of the silicon compound tends to be reduced. For this reason, it is preferable that the total amount of the water content is as small as possible.
- the one where water content is small is preferable, 100 mass ppm or less, Furthermore, 50 mass ppm or less is preferable.
- the said moisture content is so preferable that it is small, as long as it exists in said content range, 0.1 mass ppm or more may be sufficient. Therefore, it is preferable that the silicon compound and the organic solvent before preparing the chemical solution do not contain much water.
- the chemical solution raw material may be previously subjected to, for example, distillation purification or dehydration treatment with a molecular sieve or the like so that the total amount of moisture described above is obtained. Moreover, you may use the commercial item of the grade by which the water content was restrained low as a chemical
- the number of particles larger than 0.2 ⁇ m is 100 or less per 1 mL of the chemical liquid in the particle measurement by the light scattering type in-liquid particle detector in the liquid phase of the chemical liquid. If the number of particles larger than 0.2 ⁇ m is more than 100 per 1 mL of the chemical solution, the particles may cause pattern damage of the wafer containing silicon element, which causes a decrease in device yield and reliability. This is not preferable. Further, it is preferable that the number of particles larger than 0.2 ⁇ m is 100 or less per mL of the chemical solution because washing with a solvent or water after forming the protective film can be omitted or reduced.
- the number of particles larger than 0.2 ⁇ m is preferably as small as possible, but may be 1 or more per 1 mL of the chemical solution as long as it is within the above content range.
- the particle measurement in the liquid phase in the chemical solution in the present invention is performed by using a commercially available measuring device in the light scattering liquid particle measurement method using a laser as a light source. , PSL (polystyrene latex) standard particle-based light scattering equivalent diameter.
- the particles are particles such as dust, dust, organic solids and inorganic solids contained as impurities in the raw materials, and dust, dust, organic solids and inorganic solids brought in as contaminants during the preparation of chemicals. It is a particle such as an object, and finally exists as a particle without being dissolved in a chemical solution.
- each element (metal impurity) of Na, Mg, K, Ca, Mn, Fe, Cu, Li, Al, Cr, Ni, Zn, and Ag in the chemical solution is 0 for each total amount of the chemical solution. .1 mass ppb or less is preferable. If the metal impurity content is more than 0.1 mass ppb with respect to the total amount of the chemical solution, it is likely to increase the junction leakage current of the device, which causes a decrease in device yield and reliability. Absent. Further, when the metal impurity content is 0.1 mass ppb or less with respect to the total amount of the chemical solution, the surface of the wafer (protective film surface) with the solvent or water after the protective film is formed on the wafer surface.
- the content of the metal impurities is preferably as small as possible, but may be 0.001 mass ppb or more for each element with respect to the total amount of the chemical solution as long as it is within the above content range.
- the cleanliness of the liquid water-repellent protective film forming agent is the same as that of the above-described chemical solution.
- the water-repellent protective film is a film that is formed on the wafer surface to reduce the wettability of the wafer surface, that is, a film that imparts water repellency.
- the water repellency means that the surface energy of the article surface is reduced and the interaction (for example, hydrogen bond, intermolecular force) between water or other liquid and the article surface is reduced. It is. In particular, the effect of reducing the interaction with water is great, but it has the effect of reducing the interaction with a mixed liquid of water and a liquid other than water or a liquid other than water. By reducing the interaction, the contact angle of the liquid with the article surface can be increased.
- the water-repellent protective film may be formed from the above silicon compound or may contain a reaction product containing a silicon compound as a main component.
- the wafer surface is formed with a film containing a silicon element such as silicon, silicon oxide, or silicon nitride, or at least one surface of the concavo-convex pattern when the concavo-convex pattern is formed.
- the part includes a silicon element such as silicon, silicon oxide, or silicon nitride.
- a protective film can be formed on the surface of a component containing a silicon element even for a wafer composed of a plurality of components containing at least a silicon element.
- silicon, silicon oxide, silicon nitride and other components containing silicon elements are formed on the wafer surface, or when the concavo-convex pattern is formed, at least the concavo-convex pattern A part of which includes a silicon element such as silicon, silicon oxide, and silicon nitride is also included.
- the resist in order to obtain a wafer having a fine concavo-convex pattern on the surface, first, after applying a resist to a smooth wafer surface, the resist is exposed through a resist mask, and the exposed resist or exposed A resist having a desired concavo-convex pattern is produced by etching away the resist that was not present. Moreover, the resist which has an uneven
- FIG. 1 is a schematic view when a wafer 1 whose surface has a fine concavo-convex pattern 2 is viewed from the perspective, and FIG. 2 shows a part of the aa ′ cross section in FIG. . As shown in FIG.
- the width 5 of the concave portion is shown by the interval between the convex portions 3 adjacent to each other, and the aspect ratio of the convex portion is obtained by dividing the height 6 of the convex portion by the width 7 of the convex portion. It is represented by Pattern collapse in the cleaning process tends to occur when the width of the recess is 70 nm or less, particularly 45 nm or less, and the aspect ratio is 4 or more, particularly 6 or more.
- Wafer Surface Treatment Method A wafer having a fine uneven pattern on the surface obtained by etching as described above is subjected to an aqueous cleaning liquid prior to the surface treatment method of the present invention in order to remove etching residues and the like.
- the aqueous cleaning liquid retained in the recesses after the cleaning may be replaced with a cleaning liquid different from the aqueous cleaning liquid (hereinafter referred to as “cleaning liquid A”), and further cleaning may be performed.
- aqueous cleaning liquid examples include water or an aqueous solution in which at least one of organic solvents, hydrogen peroxide, ozone, acid, alkali, and surfactant is mixed in water (for example, the water content is 10 mass). % Or more).
- the cleaning liquid A refers to an organic solvent, a mixture of the organic solvent and an aqueous cleaning liquid, and a cleaning liquid in which at least one of acid, alkali, and surfactant is mixed.
- the processing method of the wafer is not particularly limited.
- a wafer processing method a single wafer method typified by a method using a spin processing apparatus for processing a wafer one by one by supplying a liquid near the center of rotation while holding the wafer substantially horizontal and rotating, A batch system in which a plurality of wafers are immersed and processed, or steam and mist are supplied to a plurality of wafers in a chamber for processing.
- the form of the protective film forming agent, chemical solution, or cleaning liquid when supplying the liquid protective film forming agent, chemical solution, or cleaning liquid to at least the concave portion of the concave / convex pattern of the wafer is set to be liquid when held in the concave portion. If it becomes, it will not specifically limit, For example, there exist a liquid, a vapor
- organic solvent that is one of the preferred examples of the cleaning liquid A include hydrocarbons, esters, ethers, ketones, halogen-containing solvents, sulfoxide solvents, lactone solvents, carbonate solvents, alcohols, Examples include polyhydric alcohol derivatives, nitrogen element-containing solvents, and the like.
- the liquid protective film-forming agent or protective film-forming chemical solution of the present invention is used by replacing the above-mentioned aqueous cleaning solution or cleaning solution A with the agent or the chemical solution.
- the replaced agent or chemical solution may be replaced with a cleaning liquid (hereinafter referred to as “cleaning liquid B”) different from the agent or the chemical liquid.
- the cleaning solution is replaced with a liquid protective film forming agent or a protective film forming chemical solution, and the agent or the chemical solution is held in at least the concave portion of the concavo-convex pattern.
- the protective film is formed on at least the concave surface of the concave / convex pattern.
- the protective film of the present invention does not necessarily have to be formed continuously, and does not necessarily have to be formed uniformly. However, since it can impart better water repellency, it can be applied continuously and uniformly. More preferably, it is formed.
- FIG. 3 is a schematic view showing a state in which the recess 4 holds the liquid protective film forming agent or the protective film forming chemical 8.
- the wafer shown in the schematic diagram of FIG. 3 shows a part of the a-a ′ cross section of FIG. 1.
- a protective film is formed on the surface of the recess 4 to make the surface water repellent.
- the temperature at which it is easy to form a homogeneous protective film is 10 ° C. or higher and lower than the boiling point of the agent or the chemical solution, and is particularly maintained at 15 ° C. or higher and 10 ° C. or lower than the boiling point of the agent or the chemical solution. It is preferable. It is preferable that the temperature of the liquid protective film forming agent or the chemical solution is maintained at the temperature even when held in at least the concave portion of the concave / convex pattern.
- the boiling point of the chemical solution means the boiling point of the component having the largest amount by mass ratio among the components contained in the protective film forming chemical solution.
- the liquid protective film forming agent or the chemical liquid remaining in at least the concave portion of the concave / convex pattern may be replaced with the cleaning liquid B, and then the drying process may be performed.
- the cleaning liquid B include an aqueous cleaning liquid, an organic solvent, a mixture of an aqueous cleaning liquid and an organic solvent, or a mixture of at least one of an acid, an alkali, and a surfactant.
- examples thereof include a protective film forming agent or a mixture of protective liquid forming chemicals.
- the cleaning liquid B is more preferably water, an organic solvent, or a mixture of water and an organic solvent from the viewpoint of removing particles and metal impurities.
- organic solvent examples include hydrocarbons, esters, ethers, ketones, halogen-containing solvents, sulfoxide solvents, alcohols, polyhydric alcohol derivatives, nitrogen elements Examples thereof include a solvent.
- the water repellency of the protective film formed on the wafer surface with the liquid protective film forming agent or the chemical solution of the present invention may not easily be reduced by the cleaning of the cleaning liquid B.
- FIG. 4 shows a schematic diagram in the case where the liquid is held in the recesses 4 made water repellent by the liquid protective film forming agent or the protective film forming chemical.
- the wafer in the schematic diagram of FIG. 4 shows a part of the a-a ′ cross section of FIG.
- the surface of the concavo-convex pattern is made water-repellent by forming the protective film 10 with the liquid protective film forming agent or the chemical solution.
- the protective film 10 is held on the wafer surface even when the liquid 9 is removed from the concavo-convex pattern.
- the contact angle when assuming that water is retained on the surface is 50 to 130. It is preferable that the angle is ° because the pattern collapse hardly occurs.
- the contact angle is large, the water repellency is excellent, so 60 to 130 ° is more preferable, and 65 to 130 ° is particularly preferable.
- the amount of decrease in the contact angle before and after cleaning with the cleaning liquid B is preferably 10 ° or less.
- the liquid held in the concave portion 4 in which the protective film is formed by the liquid protective film forming agent or the chemical solution is removed from the concave / convex pattern by drying.
- the liquid held in the recess may be the protective film forming agent or chemical solution of the liquid, the cleaning solution B, or a mixture thereof.
- the mixed liquid is a mixture of the protective film-forming agent and the cleaning liquid B, or is contained so that each component contained in the protective film-forming chemical liquid has a lower concentration than the chemical liquid.
- the liquid protective film-forming agent or chemical solution may be in the middle of replacement with the cleaning liquid B, or may be a mixed liquid obtained by previously mixing the silicon compound with the cleaning liquid B.
- the cleaning liquid B may be held on the surface of the concave / convex pattern and then dried.
- the cleaning time that is, the time for which the cleaning liquid B is held is 10 seconds or more, more preferably 20 from the viewpoint of removing particles and impurities on the uneven pattern surface. It is preferable to carry out for 2 seconds or more. From the viewpoint of the effect of maintaining the water repellency of the protective film formed on the surface of the uneven pattern, when an organic solvent is used as the cleaning liquid B, the water repellency of the wafer surface tends to be easily maintained even after the cleaning. On the other hand, if the washing time is too long, productivity is deteriorated.
- the liquid held in the uneven pattern is removed by the above drying.
- the drying is preferably performed by a known drying method such as a spin drying method, IPA (2-propanol) vapor drying, Marangoni drying, heat drying, hot air drying, air drying, or vacuum drying.
- the protective film 10 may be further removed after the drying.
- it is effective to cut the C—C bond and C—F bond in the water repellent protective film.
- the method is not particularly limited as long as it can cut the bond, for example, light irradiation of the wafer surface, heating of the wafer, exposure of the wafer to ozone, irradiation of the wafer surface with plasma, For example, corona discharge on the wafer surface may be mentioned.
- a metal halide lamp a low-pressure mercury lamp, a high-pressure mercury lamp, an excimer lamp, a carbon arc, or the like is used.
- the ultraviolet irradiation intensity is a metal halide lamp, for example, measurement with an illuminometer (irradiance intensity meter UM-10 manufactured by Konica Minolta Sensing, light receiving unit UM-360 [peak sensitivity wavelength: 365 nm, measurement wavelength range: 310 to 400 nm]) 100 mW / cm 2 or more is preferable in value, 200 mW / cm 2 or more is particularly preferable.
- the irradiation intensity is less than 100 mW / cm 2 , it takes a long time to remove the protective film 10.
- a low-pressure mercury lamp is preferable because it can irradiate ultraviolet rays having a shorter wavelength, and thus the protective film 10 can be removed in a short time even if the irradiation intensity is low.
- the protective film 10 when the protective film 10 is removed by light irradiation, if the constituent components of the protective film 10 are decomposed by ultraviolet rays and ozone is generated at the same time, and the constituent components of the protective film 10 are oxidized and volatilized by the ozone, the processing time is shortened. Therefore, it is particularly preferable.
- this light source a low-pressure mercury lamp, an excimer lamp, or the like is used. Further, the wafer may be heated while irradiating light.
- heating the wafer it is preferable to heat the wafer at 400 to 1000 ° C., preferably 500 to 900 ° C. This heating time is preferably maintained for 10 seconds to 60 minutes, preferably 30 seconds to 10 minutes. In this process, ozone exposure, plasma irradiation, corona discharge, etc. may be used in combination. Further, light irradiation may be performed while heating the wafer.
- ozone generated by ultraviolet irradiation with a low-pressure mercury lamp or the like or low-temperature discharge with a high voltage is provided on the wafer surface.
- the wafer may be irradiated with light while being exposed to ozone, or may be heated.
- the protective film on the wafer surface can be efficiently removed.
- the contact angle of water droplets is evaluated by dropping several microliters of water droplets on the surface of the sample (base material) as described in JIS R 3257 “Testing method for wettability of substrate glass surface”. It is made by measuring. However, in the case of a wafer having a pattern, the contact angle becomes very large. This is because a Wenzel effect and a Cassie effect occur, and the contact angle is affected by the surface shape (roughness) of the substrate, and the apparent contact angle of water droplets increases.
- the above-described liquid protective film forming agent or chemical solution is applied to a wafer having a smooth surface, a protective film is formed on the wafer surface, and the surface of the wafer on which the concave and convex pattern is formed.
- the film was regarded as a protective film formed in, and various evaluations were performed.
- a wafer having a smooth surface a “wafer with SiO 2 film” having a SiO 2 layer on a silicon wafer having a smooth surface was used as a wafer having a smooth surface.
- the silicon compound accepts protons from the moisture (H 2 O) in the air and the by-products are likely to adhere.
- this by-product is solid, solid matter tends to adhere to the container inlet. From the viewpoint of preventing contamination of the surrounding environment by dust, it is preferable that no solid matter adheres.
- Example 1 (1) Preparation of protective film forming chemical solution Propylene glycol monomethyl ether acetate (hereinafter referred to as “PGMEA”), which is an organic solvent, under a nitrogen gas atmosphere of 1.0 atm in a glove box set at an environmental temperature of 25 ° C. 2) trimethylsilyl-1,1,3,3-tetramethylguanidine [(CH 3 ) 2 NC ( ⁇ N—Si [CH 3 ] 3 ) —N (CH 3 ), which is a silicon compound 2 ] was dissolved to a concentration of 0.2% by mass to obtain a chemical solution for forming a protective film.
- PGMEA Propylene glycol monomethyl ether acetate
- the total amount of water in the PGMEA and 2-trimethylsilyl-1,1,3,3-tetramethylguanidine relative to the total amount of the raw materials PGMEA and 2-trimethylsilyl-1,1,3,3-tetramethylguanidine is It was 10 mass ppm.
- the initial contact angle before the surface treatment was less than 10 °, but the contact angle after the surface treatment was 85 °, which showed the effect of imparting water repellency. .
- adhesion of the above-mentioned solid matter was not confirmed, and the cleanliness of the waste chemical solution container inlet was excellent.
- Example 2 to 15 The surface treatment of the wafer was performed in the same manner as in Example 1 except that the conditions such as the type of silicon compound, the type of organic solvent, the concentration of the silicon compound, the total amount of moisture in the raw material were changed. Further evaluation was performed. The results are shown in Table 1. In the table, “DnBE” means dinormal butyl ether, “DiAE” means diisoamyl ether, and (Ph) HN—C ( ⁇ N—Si [CH 3 ] 3 ) —NH (Ph) Means 2-trimethylsilyl-1,3-diphenylguanidine which is a silicon compound.
- the initial contact angle before the surface treatment was less than 10 °, which showed the effect of imparting water repellency after the surface treatment.
- the total amount of water contained in the water repellent protective film forming agent (silicon compound) and the organic solvent before preparing the water repellent protective film forming chemical solution is as follows: It was confirmed that the smaller the total amount of the water repellent protective film forming agent and the organic solvent, the better the effect of imparting water repellency. Further, as can be seen from the results of Examples 5 and 15, in Example 15 in which the compound by-produced when the silicon compound accepts protons is a solid, the adhesion of the solid matter was slightly confirmed. In Example 5 in which the by-product compound was liquid, adhesion of solid matter was not confirmed, and the cleanliness of the waste chemical container inlet was more excellent.
- Comparative Example 1 As shown in Table 2, the surface treatment of the wafer was performed in the same manner as in Example 1 except that the conditions such as the type and concentration of the silicon compound were changed, and the evaluation was further performed.
- the starting material in Table 2 means the silicon compound and organic solvent before chemical
- Comparative Example 1 is an experimental example using a protective film-forming chemical solution containing trimethylmethoxysilane instead of 2-trimethylsilyl-1,1,3,3-tetramethylguanidine, and the contact angle after surface treatment is The effect of imparting water repellency was not observed as low as less than 10 °.
- Reference Examples 1 and 2 As a reference example, the surface treatment of the wafer was performed in the same manner as in Example 1 except that the protective film forming chemicals shown in the examples of Patent Documents 1 and 2 were used, and the evaluation was further performed. The results are shown in Table 2.
- Reference Example 1 refers to Example 22 of Patent Document 1 and uses a protective film forming chemical obtained by mixing 3 g of trimethylchlorosilane [(CH 3 ) 3 SiCl]; When the treatment was performed, the contact angle after the surface treatment was 65 °, which showed the effect of imparting water repellency.
- the starting materials in Table 2 mean trimethylchlorosilane and toluene before preparation of the chemical solution.
- Reference Example 2 is based on Example 4 of Patent Document 2, and trimethylmethoxysilane [(CH 3 ) 3 Si—OCH 3 ]; 3 g, trifluoromethanesulfonic acid [CF 3 SO 3 H]; 1 g, PGMEA; 96 g
- the surface treatment of the wafer was performed using a chemical solution for forming a protective film obtained by mixing the above, the contact angle after the surface treatment was 84 °, indicating a water repellency imparting effect.
- the starting materials in Table 2 mean trimethylmethoxysilane, trifluoromethanesulfonic acid and PGMEA before preparation of the chemical solution.
- Example 16 instead of the protective film forming chemical solution, the wafer surface was treated in the same manner as in Example 1 except that 2-trimethylsilyl-1,1,3,3-tetramethylguanidine was used as the liquid protective film forming agent. Furthermore, the evaluation was performed. 2-Trimethylsilyl-1,1,3,3-tetramethylguanidine is in a liquid state at 25 ° C. and 1.0 atm. As a result, the initial contact angle before the surface treatment was less than 10 °, but the contact angle after the surface treatment was 92 °, indicating an excellent water repellency imparting effect. Moreover, adhesion of the above-mentioned solid matter was not confirmed, and the cleanliness of the waste chemical solution container inlet was excellent.
- the water repellency imparting effect of the liquid water repellent protective film forming agent or the protective film forming chemical solution of the present invention was equivalent to the water repellency imparting effect of the protective film forming chemical solution of the reference example. Therefore, the water-repellent imparting effect equivalent to that of a conventional protective film-forming chemical solution, a component that forms a water-repellent protective film does not contain chlorine atoms, and does not require a component that promotes protective film formation. A protective film forming agent or a novel chemical for forming a protective film could be found.
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Abstract
Description
このとき、上記一般式[1]、及び[2]において、3つのR2のうち、少なくとも2つがメチル基であると、上記保護膜を均質に形成できるので好ましい。なお、上記R2が、2個のメチル基と1個の直鎖状アルキル基の組合せであると、上記保護膜をより均質に形成できるので特に好ましい。
(1)ケイ素化合物について
本発明の撥水性保護膜形成剤は、上記一般式[1]で表されるグアニジン誘導体、及び、上記一般式[2]で表されるアミジン誘導体からなる群から選ばれる少なくとも1種のケイ素化合物である。
上記一般式[1]、及び[2]のR2基は、撥水性の官能基である。そして、上記グアニジン誘導体のグアニジル基、及び、アミジン誘導体のアミジニル基がウェハ表面のシラノール基と反応し、上記撥水性の官能基を有する部位がウェハ表面に固定されることにより、該ウェハ表面に撥水性の保護膜が形成する。
なお、上記一般式[1]で表されるグアニジン誘導体、及び、上記一般式[2]で表されるアミジン誘導体は25℃、1.0気圧で液体状態の化合物である。液体状態の撥水性保護膜形成剤を用いてシリコン元素を含むウェハの表面処理を行う場合、温度を調整することで当該液体状態の撥水性保護膜形成剤の粘度を調節することが好ましい。
なお、上記R1に係る炭化水素基は酸素原子を有していてもよい。この場合は、例えば、メトキシ基、エトキシ基、プロポキシ基、ブトキシ基等の直鎖、分岐状、又は環状のアルコキシ基が挙げられる。また、上述の炭化水素基の炭素原子間に酸素原子を介在させたエーテル結合を有するものであってもよい。
また、炭化水素基は窒素原子を有していてもよい。この場合は、例えば、炭化水素基中に1~3級のアミノ基を有するものが挙げられる。
2-トリメチルシリル-1,1,3,3-テトラメチルグアニジン、2-エチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ジエチルメチルシリル-1,1,3,3-テトラメチルグアニジン、2-トリエチルシリル-1,1,3,3-テトラメチルグアニジン、2-プロピルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ジプロピルメチルシリル-1,1,3,3-テトラメチルグアニジン、2-トリプロピルシリル-1,1,3,3-テトラメチルグアニジン、2-ブチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ペンチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ヘキシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ヘプチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-オクチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ノニルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-デシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ウンデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ドデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-トリデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-テトラデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ペンタデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ヘキサデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ヘプタデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-オクタデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-メチルシリル-1,1,3,3-テトラメチルグアニジン、2-ジエチルシリル-1,1,3,3-テトラメチルグアニジン、2-エチルシリル-1,1,3,3-テトラメチルグアニジン、2-エチルメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ジプロピルシリル-1,1,3,3-テトラメチルグアニジン等の上記R2がアルキル基であるグアニジン誘導体や、
2-トリフルオロプロピルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ペンタフルオロブチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ヘプタフルオロペンチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ノナフルオロヘキシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ウンデカフルオロヘプチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-トリデカフルオロオクチルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ペンタデカフルオロノニルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-ヘプタデカフルオロデシルジメチルシリル-1,1,3,3-テトラメチルグアニジン、2-トリフルオロプロピルメチルシリル-1,1,3,3-テトラメチルグアニジン等の上記R2がフルオロアルキル基とアルキル基の組み合わせであるグアニジン誘導体や、
上記のグアニジン誘導体の1,1,3,3-テトラメチルグアニジル基のメチル基部分を、それぞれ互いに独立して、水素原子、-C≡N基、-NO2基、及び、一部又は全ての水素元素がフッ素元素に置き換えられていても良いメチル基以外の炭化水素基等に置き換えた化合物が挙げられる。なお、上記炭化水素基は酸素原子及び/又は窒素原子を有していてもよい。
このとき、上記一般式[1]、及び[2]において、3つのR2のうち、少なくとも2つがメチル基であると、上記保護膜を均質に形成できるので好ましい。なお、上記R2が、2個のメチル基と1個の直鎖状アルキル基の組合せであると、上記保護膜をより均質に形成できるので特に好ましい。
上記撥水性保護膜形成用薬液において、上記ケイ素化合物は、有機溶媒によって希釈されている。上記ケイ素化合物と有機溶媒の総量100質量%に対して、該ケイ素化合物の濃度が、0.01~25質量%であると、シリコン元素を含むウェハの表面に均一に保護膜を形成しやすくなるため好ましい。0.01質量%未満では、撥水性付与効果が不十分となる傾向がある。また、25質量%以下であるとコスト的な観点から好ましい。さらに好ましくは0.1~15質量%、より好ましくは0.5~10質量%である。
本発明の液体状態の保護膜形成剤又は薬液には、該剤又は該薬液の安定性をさらに高めるために、重合禁止剤や連鎖移動剤、酸化防止剤等の添加剤を含んでいてもよい。例えば、4-メトキシフェノール、ジブチルヒドロキシトルエン、ブチルヒドロキシアニソール、1,4-ベンゼンジオール、2-(1,1-ジメチルエチル)-1,4-ベンゼンジオール、1,4-ベンゾキノン、1-オクタンチオール、1-ノナンチオール、1-デカンチオール、1-ウンデカンチオール、1-ドデカンチオール、オクチル-3,5-ジ-tert-ブチル-4-ヒドロキシ-ヒドロ肉桂酸(BASF製、Irganox1135)、6-tert-ブチル-2,4-キシレノール等が挙げられる。
また、上記薬液を調製する前の、上記撥水性保護膜形成剤と上記有機溶媒に含まれる水分の総量が、該撥水性保護膜形成剤と有機溶媒の総量に対し5000質量ppm以下であることが好ましい。水分量の総量が5000質量ppm超の場合、上記ケイ素化合物の撥水性付与効果が低下する傾向がある。このため、上記水分量の総量は少ないほど好ましく、特に500質量ppm以下、さらには200質量ppm以下が好ましい。さらに、水の存在量が多いと、上記薬液の保管安定性が低下しやすいため、水分量は少ない方が好ましく、100質量ppm以下、さらには50質量ppm以下が好ましい。なお、上記水分量は少ないほど好ましいが上記の含有量範囲内であれば、0.1質量ppm以上であってもよい。従って、上記薬液を調製する前の、ケイ素化合物や有機溶媒は水を多く含有しないものであることが好ましい。
なお、上述の水分の総量となるように、予め薬液原料に、例えば、蒸留精製を施したり、モレキュラーシーブ等で脱水処理を施したりしてもよい。また薬液原料として含水量が低く抑えられたグレードの市販品を用いてもよい。
ここで、上記パーティクルとは、原料に不純物として含まれる塵、埃、有機固形物、無機固形物などの粒子や、薬液の調製中に汚染物として持ち込まれる塵、埃、有機固形物、無機固形物などの粒子などであり、最終的に薬液中で溶解せずに粒子として存在するものが該当する。
なお、液体状態の撥水性保護膜形成剤でウェハの表面処理を行う場合の、当該液体状態の撥水性保護膜形成剤の清浄度も上述の薬液の場合と同様である。
本発明において、撥水性保護膜とは、ウェハ表面に形成されることにより、該ウェハ表面の濡れ性を低くする膜、すなわち撥水性を付与する膜のことである。本発明において撥水性とは、物品表面の表面エネルギーを低減させて、水やその他の液体と該物品表面との間(界面)で相互作用、例えば、水素結合、分子間力などを低減させる意味である。特に水に対して相互作用を低減させる効果が大きいが、水と水以外の液体の混合液や、水以外の液体に対しても相互作用を低減させる効果を有する。該相互作用の低減により、物品表面に対する液体の接触角を大きくすることができる。なお、撥水性保護膜は、上記ケイ素化合物から形成されたものであってもよいし、ケイ素化合物を主成分とする反応物を含むものであっても良い。
上記のウェハとしては、ウェハ表面にシリコン、酸化ケイ素、又は窒化ケイ素などケイ素元素を含む膜が形成されたもの、あるいは、上記凹凸パターンを形成したときに、該凹凸パターンの表面の少なくとも一部がシリコン、酸化ケイ素、又は窒化ケイ素などケイ素元素を含むものが含まれる。また、少なくともケイ素元素を含む複数の成分から構成されたウェハに対しても、ケイ素元素を含む成分の表面に保護膜を形成することができる。該複数の成分から構成されたウェハとしては、シリコン、酸化ケイ素、及び、窒化ケイ素などケイ素元素を含む成分がウェハ表面に形成したもの、あるいは、凹凸パターンを形成したときに、該凹凸パターンの少なくとも一部がシリコン、酸化ケイ素、及び、窒化ケイ素などケイ素元素を含む成分となるものも含まれる。なお、上記薬液や液体状態の撥水性保護膜形成剤で保護膜を形成できるのは上記凹凸パターン中のケイ素元素を含む部分の表面である。
上記のようにエッチングによって得られた、表面に微細な凹凸パターンを有するウェハは、本発明の表面処理方法に先立って、エッチングの残渣などを除去するために、水系洗浄液で洗浄されてもよいし、該洗浄後に凹部に保持された水系洗浄液を該水系洗浄液とは異なる洗浄液(以降、「洗浄液A」と記載する)に置換してさらに洗浄されてもよい。
ただし、表面に凹凸パターンを有するウェハの場合、該凹凸パターン表面に形成された上記保護膜10自体の接触角を正確に評価できない。
(A)ウェハ表面に形成された保護膜の接触角評価
保護膜が形成されたウェハ表面上に純水約2μlを置き、水滴とウェハ表面とのなす角(接触角)を接触角計(協和界面科学製:CA-X型)で測定した。
ウェハへの表面処理後の液体状態の撥水性保護膜形成剤や撥水性保護膜形成用薬液(廃薬液)を、廃薬液容器に回収した。該容器の蓋を開放したまま、環境温度を25℃、湿度を50%RHに維持したドラフト内で1日静置したのち、廃薬液容器の投入口への固形物付着の様子を目視で観察した。
上記廃薬液中では、ウェハの表面処理工程におけるシラノール基や、iPA等の洗浄液から、ケイ素化合物がプロトンを受容し、副生物が増加している。特に、上述のような廃薬液投入口付近においては、空気中の水分(H2O)から、ケイ素化合物がプロトンを受容し、副生物が付着し易くなることが予想される。当然ながらこの副生物が固体である場合、容器投入口への固形物の付着が生じやすい。粉塵による周囲環境への汚染を防ぐ観点から、固形物の付着はない方が好ましい。
(1)保護膜形成用薬液の調製
環境温度を25℃に設定したグローブボックス内で、1.0気圧の窒素ガス雰囲気の下、有機溶媒であるプロピレングリコールモノメチルエーテルアセテート(以降、「PGMEA」と記載する)に、ケイ素化合物である2-トリメチルシリル-1,1,3,3-テトラメチルグアニジン〔(CH3)2N-C(=N-Si[CH3]3)-N(CH3)2〕を0.2質量%の濃度となるように溶解して、保護膜形成用薬液を得た。
このとき、原料のPGMEAと2-トリメチルシリル-1,1,3,3-テトラメチルグアニジンの総量に対する、該PGMEA及び2-トリメチルシリル-1,1,3,3-テトラメチルグアニジン中の水分の総量は、10質量ppmであった。
平滑な熱酸化膜付きシリコンウェハ(表面に厚さ1μmの熱酸化膜層を有するSiウェハ)を1質量%のフッ酸水溶液に25℃で10分浸漬し、純水に25℃で1分、2-プロパノール(iPA)に25℃で1分浸漬した。
上記洗浄後のシリコンウェハを、上記「(1)保護膜形成用薬液の調製」で調製した保護膜形成用薬液に25℃で1分浸漬し、iPAに25℃で1分、純水に25℃で1分浸漬した。最後に、シリコンウェハを純水から取出し、エアーを吹き付けて、表面の純水を除去した。
実施例1で用いたケイ素化合物の種類、有機溶媒の種類、ケイ素化合物の濃度、原料中の水分の総量などの条件を変更して、それ以外は実施例1と同様にウェハの表面処理を行い、さらにその評価を行った。結果を表1に示す。
なお、表中で、「DnBE」はジノルマルブチルエーテルを意味し、「DiAE」はジイソアミルエーテルを意味し、(Ph)HN-C(=N-Si[CH3]3)-NH(Ph)はケイ素化合物である2-トリメチルシリル-1,3-ジフェニルグアニジンを意味する。
表2に示すように、ケイ素化合物の種類や濃度などの条件を変更して、それ以外は実施例1と同様にウェハの表面処理を行い、さらにその評価を行った。なお、本比較例1において表2中の出発原料とは、薬液調製前のケイ素化合物と有機溶媒のことを意味する。
比較例1は、2-トリメチルシリル-1,1,3,3-テトラメチルグアニジンの代わりにトリメチルメトキシシランを含有させた保護膜形成用薬液を用いた実験例であり、表面処理後の接触角が10°未満と低く、撥水性付与効果は見られなかった。
参考例として、特許文献1、2の実施例に示す保護膜形成用薬液を用いて、それ以外は実施例1と同様にウェハの表面処理を行い、さらにその評価を行った。結果を表2に示す。
参考例1は、特許文献1の実施例22を参考とし、トリメチルクロロシラン〔(CH3)3SiCl〕;3g、トルエン;97gを混合して得られた保護膜形成用薬液を用いてウェハの表面処理を行ったところ、表面処理後の接触角が65°であり、撥水性付与効果を示した。なお、本参考例1において表2中の出発原料とは、薬液調製前のトリメチルクロロシランとトルエンのことを意味する。
参考例2は、特許文献2の実施例4を参考とし、トリメチルメトキシシラン〔(CH3)3Si-OCH3〕;3g、トリフルオロメタンスルホン酸〔CF3SO3H〕;1g、PGMEA;96gを混合して得られた保護膜形成用薬液を用いてウェハの表面処理を行ったところ、表面処理後の接触角が84°であり、撥水性付与効果を示した。なお、本参考例2において表2中の出発原料とは、薬液調製前のトリメチルメトキシシランとトリフルオロメタンスルホン酸とPGMEAのことを意味する。
保護膜形成用薬液の代わりに、液体状態の保護膜形成剤として2-トリメチルシリル-1,1,3,3-テトラメチルグアニジンを用いた以外は実施例1と同様にウェハの表面処理を行い、さらにその評価を行った。なお、2-トリメチルシリル-1,1,3,3-テトラメチルグアニジンは、25℃、1.0気圧で液体状態である。
その結果、表面処理前の初期接触角が10°未満であったものが、表面処理後の接触角は92°となり、優れた撥水性付与効果を示した。また、上述の固形物の付着は確認されず、廃薬液容器投入口の清浄性が優れた結果であった。
2: ウェハ表面の微細な凹凸パターン
3: パターンの凸部
4: パターンの凹部
5: 凹部の幅
6: 凸部の高さ
7: 凸部の幅
8: 凹部4に保持された液体の撥水性保護膜形成剤又は保護膜形成用薬液
9: 凹部4に保持された液体
10: 保護膜
Claims (13)
- シリコン元素を含むウェハの表面に撥水性保護膜を形成するための撥水性保護膜形成剤であって、前記剤が、下記一般式[1]で表されるグアニジン誘導体、及び、下記一般式[2]で表されるアミジン誘導体からなる群から選ばれる少なくとも1種のケイ素化合物である、撥水性保護膜形成剤。
- 前記一般式[1]、及び[2]において、bが0である、請求項1に記載の撥水性保護膜形成剤。
- 前記一般式[1]、及び[2]において、3つのR2のうち、少なくとも2つがメチル基である、請求項2に記載の撥水性保護膜形成剤。
- 前記一般式[1]、及び[2]のR1が、それぞれ互いに独立して、水素原子、炭素数1~6のアルキル基、及び炭素数1~6のアルコキシ基からなる群から選ばれる基である、請求項1~3のいずれかに記載の撥水性保護膜形成剤。
- 前記ケイ素化合物がプロトンを受容した際に副生する化合物が、25℃、1.0気圧で液体である、請求項1~4のいずれかに記載の撥水性保護膜形成剤。
- 前記ケイ素化合物が、前記一般式[1]で表される化合物である、請求項1~5のいずれかに記載の撥水性保護膜形成剤。
- 前記ケイ素化合物が、前記一般式[1]において、R1がすべてメチル基であり、aが3であり、bが0であり、3つのR2のうち2つがメチル基であり、残りのR2が一部又は全ての水素元素がフッ素元素に置き換えられていても良い炭素数が1~18の1価の炭化水素基である化合物である、請求項6に記載の撥水性保護膜形成剤。
- 請求項1~7のいずれかに記載の撥水性保護膜形成剤を有機溶媒に溶解した、撥水性保護膜形成用薬液。
- 前記撥水性保護膜形成剤と前記有機溶媒の総量100質量%に対する該撥水性保護膜形成剤の濃度が0.01~25質量%である、請求項8に記載の撥水性保護膜形成用薬液。
- 前記有機溶媒が、非プロトン性溶媒である、請求項8又は9に記載の撥水性保護膜形成用薬液。
- 前記撥水性保護膜形成用薬液を調製する前の、前記撥水性保護膜形成剤と前記有機溶媒に含まれる水分の総量が、該撥水性保護膜形成剤と有機溶媒の総量に対し5000質量ppm以下である、請求項8~10のいずれかに記載の撥水性保護膜形成用薬液。
- 請求項1~7のいずれかに記載の液体状態の撥水性保護膜形成剤を用いる、シリコン元素を含むウェハの表面処理方法。
- 請求項8~11のいずれかに記載の撥水性保護膜形成用薬液を用いる、シリコン元素を含むウェハの表面処理方法。
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