WO2023008507A1 - シリコン含有レジスト下層膜形成用組成物、及びシリコン含有レジスト下層膜 - Google Patents
シリコン含有レジスト下層膜形成用組成物、及びシリコン含有レジスト下層膜 Download PDFInfo
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- WO2023008507A1 WO2023008507A1 PCT/JP2022/029045 JP2022029045W WO2023008507A1 WO 2023008507 A1 WO2023008507 A1 WO 2023008507A1 JP 2022029045 W JP2022029045 W JP 2022029045W WO 2023008507 A1 WO2023008507 A1 WO 2023008507A1
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- Prior art keywords
- group
- underlayer film
- resist underlayer
- silicon
- forming
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- BXYASSFFTRSIGT-UHFFFAOYSA-N trichloro-[(2-methylpropan-2-yl)oxy-phenylmethyl]silane Chemical compound CC(C)(C)OC([Si](Cl)(Cl)Cl)C1=CC=CC=C1 BXYASSFFTRSIGT-UHFFFAOYSA-N 0.000 description 1
- ZZARCDHCAFJWJC-UHFFFAOYSA-N trichloro-[ethoxy(phenyl)methyl]silane Chemical compound CCOC([Si](Cl)(Cl)Cl)C1=CC=CC=C1 ZZARCDHCAFJWJC-UHFFFAOYSA-N 0.000 description 1
- SMGOKIYLLQQVJE-UHFFFAOYSA-N trichloro-[methoxy(phenyl)methyl]silane Chemical compound COC([Si](Cl)(Cl)Cl)C1=CC=CC=C1 SMGOKIYLLQQVJE-UHFFFAOYSA-N 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- VBSUMMHIJNZMRM-UHFFFAOYSA-N triethoxy(2-phenylethyl)silane Chemical compound CCO[Si](OCC)(OCC)CCC1=CC=CC=C1 VBSUMMHIJNZMRM-UHFFFAOYSA-N 0.000 description 1
- VQFQVYFUZUTIMU-UHFFFAOYSA-N triethoxy(7-oxabicyclo[4.1.0]heptan-4-ylmethyl)silane Chemical compound C1C(C[Si](OCC)(OCC)OCC)CCC2OC21 VQFQVYFUZUTIMU-UHFFFAOYSA-N 0.000 description 1
- DENFJSAFJTVPJR-UHFFFAOYSA-N triethoxy(ethyl)silane Chemical compound CCO[Si](CC)(OCC)OCC DENFJSAFJTVPJR-UHFFFAOYSA-N 0.000 description 1
- UNKMHLWJZHLPPM-UHFFFAOYSA-N triethoxy(oxiran-2-ylmethoxymethyl)silane Chemical compound CCO[Si](OCC)(OCC)COCC1CO1 UNKMHLWJZHLPPM-UHFFFAOYSA-N 0.000 description 1
- JCVQKRGIASEUKR-UHFFFAOYSA-N triethoxy(phenyl)silane Chemical compound CCO[Si](OCC)(OCC)C1=CC=CC=C1 JCVQKRGIASEUKR-UHFFFAOYSA-N 0.000 description 1
- UMFJXASDGBJDEB-UHFFFAOYSA-N triethoxy(prop-2-enyl)silane Chemical compound CCO[Si](CC=C)(OCC)OCC UMFJXASDGBJDEB-UHFFFAOYSA-N 0.000 description 1
- OHKFEBYBHZXHMM-UHFFFAOYSA-N triethoxy-[1-(oxiran-2-ylmethoxy)butyl]silane Chemical compound CCO[Si](OCC)(OCC)C(CCC)OCC1CO1 OHKFEBYBHZXHMM-UHFFFAOYSA-N 0.000 description 1
- SJQPASOTJGFOMU-UHFFFAOYSA-N triethoxy-[1-(oxiran-2-ylmethoxy)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)C(C)OCC1CO1 SJQPASOTJGFOMU-UHFFFAOYSA-N 0.000 description 1
- NFRRMEMOPXUROM-UHFFFAOYSA-N triethoxy-[1-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)C(CC)OCC1CO1 NFRRMEMOPXUROM-UHFFFAOYSA-N 0.000 description 1
- UDUKMRHNZZLJRB-UHFFFAOYSA-N triethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OCC)(OCC)OCC)CCC2OC21 UDUKMRHNZZLJRB-UHFFFAOYSA-N 0.000 description 1
- FVMMYGUCXRZVPJ-UHFFFAOYSA-N triethoxy-[2-(oxiran-2-ylmethoxy)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CC(CC)OCC1CO1 FVMMYGUCXRZVPJ-UHFFFAOYSA-N 0.000 description 1
- RWJUTPORTOUFDY-UHFFFAOYSA-N triethoxy-[2-(oxiran-2-ylmethoxy)ethyl]silane Chemical compound CCO[Si](OCC)(OCC)CCOCC1CO1 RWJUTPORTOUFDY-UHFFFAOYSA-N 0.000 description 1
- CFUDQABJYSJIQY-UHFFFAOYSA-N triethoxy-[2-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CC(C)OCC1CO1 CFUDQABJYSJIQY-UHFFFAOYSA-N 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- PSUKBUSXHYKMLU-UHFFFAOYSA-N triethoxy-[4-(7-oxabicyclo[4.1.0]heptan-4-yl)butyl]silane Chemical compound C1C(CCCC[Si](OCC)(OCC)OCC)CCC2OC21 PSUKBUSXHYKMLU-UHFFFAOYSA-N 0.000 description 1
- GSUGNQKJVLXBHC-UHFFFAOYSA-N triethoxy-[4-(oxiran-2-ylmethoxy)butyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCCOCC1CO1 GSUGNQKJVLXBHC-UHFFFAOYSA-N 0.000 description 1
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- RXJKFRMDXUJTEX-UHFFFAOYSA-N triethylphosphine Chemical compound CCP(CC)CC RXJKFRMDXUJTEX-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-M triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-M 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- UBMUZYGBAGFCDF-UHFFFAOYSA-N trimethoxy(2-phenylethyl)silane Chemical compound CO[Si](OC)(OC)CCC1=CC=CC=C1 UBMUZYGBAGFCDF-UHFFFAOYSA-N 0.000 description 1
- JLGNHOJUQFHYEZ-UHFFFAOYSA-N trimethoxy(3,3,3-trifluoropropyl)silane Chemical compound CO[Si](OC)(OC)CCC(F)(F)F JLGNHOJUQFHYEZ-UHFFFAOYSA-N 0.000 description 1
- HGCVEHIYVPDFMS-UHFFFAOYSA-N trimethoxy(7-oxabicyclo[4.1.0]heptan-4-ylmethyl)silane Chemical compound C1C(C[Si](OC)(OC)OC)CCC2OC21 HGCVEHIYVPDFMS-UHFFFAOYSA-N 0.000 description 1
- LFBULLRGNLZJAF-UHFFFAOYSA-N trimethoxy(oxiran-2-ylmethoxymethyl)silane Chemical compound CO[Si](OC)(OC)COCC1CO1 LFBULLRGNLZJAF-UHFFFAOYSA-N 0.000 description 1
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 description 1
- LFRDHGNFBLIJIY-UHFFFAOYSA-N trimethoxy(prop-2-enyl)silane Chemical compound CO[Si](OC)(OC)CC=C LFRDHGNFBLIJIY-UHFFFAOYSA-N 0.000 description 1
- FFJVMNHOSKMOSA-UHFFFAOYSA-N trimethoxy-[1-(oxiran-2-ylmethoxy)butyl]silane Chemical compound CCCC([Si](OC)(OC)OC)OCC1CO1 FFJVMNHOSKMOSA-UHFFFAOYSA-N 0.000 description 1
- DAVVOFDYOGMLNQ-UHFFFAOYSA-N trimethoxy-[1-(oxiran-2-ylmethoxy)ethyl]silane Chemical compound CO[Si](OC)(OC)C(C)OCC1CO1 DAVVOFDYOGMLNQ-UHFFFAOYSA-N 0.000 description 1
- FNBIAJGPJUOAPB-UHFFFAOYSA-N trimethoxy-[1-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)C(CC)OCC1CO1 FNBIAJGPJUOAPB-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- HTVULPNMIHOVRU-UHFFFAOYSA-N trimethoxy-[2-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CC(C)OCC1CO1 HTVULPNMIHOVRU-UHFFFAOYSA-N 0.000 description 1
- DBUFXGVMAMMWSD-UHFFFAOYSA-N trimethoxy-[3-(7-oxabicyclo[4.1.0]heptan-4-yl)propyl]silane Chemical compound C1C(CCC[Si](OC)(OC)OC)CCC2OC21 DBUFXGVMAMMWSD-UHFFFAOYSA-N 0.000 description 1
- ZQPNGHDNBNMPON-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)butyl]silane Chemical compound CO[Si](OC)(OC)CCC(C)OCC1CO1 ZQPNGHDNBNMPON-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- ZOWVSEMGATXETK-UHFFFAOYSA-N trimethoxy-[4-(7-oxabicyclo[4.1.0]heptan-4-yl)butyl]silane Chemical compound C1C(CCCC[Si](OC)(OC)OC)CCC2OC21 ZOWVSEMGATXETK-UHFFFAOYSA-N 0.000 description 1
- GUKYSRVOOIKHHB-UHFFFAOYSA-N trimethoxy-[4-(oxiran-2-ylmethoxy)butyl]silane Chemical compound CO[Si](OC)(OC)CCCCOCC1CO1 GUKYSRVOOIKHHB-UHFFFAOYSA-N 0.000 description 1
- 239000005051 trimethylchlorosilane Substances 0.000 description 1
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- HADKRTWCOYPCPH-UHFFFAOYSA-M trimethylphenylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C1=CC=CC=C1 HADKRTWCOYPCPH-UHFFFAOYSA-M 0.000 description 1
- MDTPTXSNPBAUHX-UHFFFAOYSA-M trimethylsulfanium;hydroxide Chemical compound [OH-].C[S+](C)C MDTPTXSNPBAUHX-UHFFFAOYSA-M 0.000 description 1
- 125000003960 triphenylenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3C3=CC=CC=C3C12)* 0.000 description 1
- XZZGCKRBJSPNEF-UHFFFAOYSA-M triphenylsulfanium;acetate Chemical compound CC([O-])=O.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 XZZGCKRBJSPNEF-UHFFFAOYSA-M 0.000 description 1
- WLOQLWBIJZDHET-UHFFFAOYSA-N triphenylsulfonium Chemical compound C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 WLOQLWBIJZDHET-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- XMUJIPOFTAHSOK-UHFFFAOYSA-N undecan-2-ol Chemical compound CCCCCCCCCC(C)O XMUJIPOFTAHSOK-UHFFFAOYSA-N 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 239000005050 vinyl trichlorosilane Substances 0.000 description 1
- YVTHLONGBIQYBO-UHFFFAOYSA-N zinc indium(3+) oxygen(2-) Chemical compound [O--].[Zn++].[In+3] YVTHLONGBIQYBO-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of 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; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/06—Polysiloxanes containing silicon bound to oxygen-containing groups
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/075—Silicon-containing compounds
- G03F7/0757—Macromolecular compounds containing Si-O, Si-C or Si-N bonds
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
-
- 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
-
- 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
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
Definitions
- the present invention relates to a composition for forming a silicon-containing resist underlayer film and a silicon-containing resist underlayer film.
- Microfabrication by lithography using a photoresist has been conventionally performed in the manufacture of semiconductor devices. Microfabrication is achieved by forming a thin film of photoresist on a semiconductor substrate such as a silicon wafer, irradiating it with actinic rays such as ultraviolet rays through a mask pattern on which a semiconductor device pattern is drawn, and developing it. This is a processing method in which fine unevenness corresponding to the pattern is formed on the surface of the substrate by etching the substrate using a photoresist pattern as a protective film.
- a film known as a hard mask containing metal elements such as silicon and titanium is used as an underlayer film between the semiconductor substrate and the photoresist.
- the resist and the hard mask have large differences in their constituent components, their removal rate by dry etching greatly depends on the type of gas used for dry etching. By appropriately selecting the gas species, the hard mask can be removed by dry etching without significantly reducing the film thickness of the photoresist.
- a resist underlayer film has been placed between the semiconductor substrate and the photoresist in order to achieve various effects including an antireflection effect.
- compositions for resist underlayer films have been studied so far, the development of new materials for resist underlayer films is desired due to the diversity of required properties.
- coating-type BPSG (boron phosphorous glass) film-forming composition containing a structure having a specific silicic acid skeleton Patent Document 1
- Patent Document 2 A composition for forming a silicon-containing resist underlayer film containing a carbonyl structure (Patent Document 2) is disclosed for the purpose of removing a chemical solution.
- the present invention has been made in view of such circumstances, and a silicon-containing resist underlayer film that can improve the resolution of the resist pattern by preventing the collapse of the fine resist pattern, and the silicon
- An object of the present invention is to provide a composition for forming a silicon-containing resist underlayer film capable of forming a silicon-containing resist underlayer film.
- the present invention includes the following.
- the silicon-containing resist underlayer film of [1] which has at least one of a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group.
- a hydrolyzable silane (A)-derived structural unit having at least one of a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group.
- [A'] component polysiloxane
- [B] component a hydrolyzable silane (A) having at least one of a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group
- [C] component a composition for forming a silicon-containing resist underlayer film containing a solvent thing.
- A-1 The composition for forming a silicon-containing resist underlayer film according to [4] or [5], wherein the hydrolyzable silane (A) is a compound represented by the following formula (A-1).
- A-1 represents an integer of 1 to 3.
- b represents an integer of 0 to 2;
- a+b represents an integer of 1-3.
- R 1 represents a group having at least one of a nitrophenyl group, a methoxyphenylsulfonyl group and a phenanthryl group and optionally having an ionic bond.
- R 2 is an optionally substituted alkyl group, an optionally substituted aryl group (excluding a phenanthryl group), an optionally substituted aralkyl group, an optionally substituted halogenated alkyl group, optionally substituted halogenated aryl group, optionally substituted halogenated aralkyl group, optionally substituted alkoxyalkyl group, optionally substituted alkoxyaryl group, optionally substituted alkoxyaralkyl group or an optionally substituted alkenyl group, or an organic group having an epoxy group, an organic group having an acryloyl group, an organic group having a methacryloyl group, an organic group having a mercapto group, or an organic group having an amino group , an organic group having an alk
- R 1 in formula (A-1) is represented by formula (A-2a), formula (A-2b), or formula (A-2c) below.
- Composition for forming resist underlayer film containing (In formula (A-2a), R 11 represents a divalent organic group which may have a single bond or an ionic bond; c represents an integer of 1 to 5; In formula (A-2b), R 12 represents a divalent organic group which may have an ionic bond.
- Component [D] The composition for forming a silicon-containing resist underlayer film according to any one of [4] to [11], further containing a curing catalyst.
- Component [E] The composition for forming a silicon-containing resist underlayer film according to any one of [4] to [12], further containing nitric acid.
- Component [14] The composition for forming a silicon-containing resist underlayer film according to any one of [4] to [13], wherein the component [C] contains water.
- a silicon-containing resist underlayer film which is a cured product of the composition for forming a silicon-containing resist underlayer film according to any one of [4] to [15].
- [21] forming an organic underlayer film on a semiconductor substrate; a step of applying the silicon-containing resist underlayer film-forming composition according to any one of [4] to [15] onto the organic underlayer film and baking the composition to form a resist underlayer film; a step of applying a composition for forming a resist film on the resist underlayer film to form a resist film; exposing and developing the resist film to obtain a resist pattern; Etching the resist underlayer film using the resist pattern as a mask; using the patterned resist underlayer film as a mask to etch the organic underlayer film; A method of forming a pattern, comprising: [22] removing the resist underlayer film by a wet method using a chemical after the step of etching the organic underlayer film; The pattern forming method according to [21], further comprising [23] The resist film is formed from an EUV lithography resist. The pattern forming method according to [21] or [22].
- a silicon-containing resist underlayer film and a silicon-containing resist underlayer capable of forming the silicon-containing resist underlayer film can improve the resolution of the resist pattern by preventing the collapse of the fine resist pattern.
- a film-forming composition can be provided.
- the silicon-containing resist underlayer film of the present invention has a maximum optical absorption coefficient (k value) of 0.05 or more in the wavelength region of 220 nm to 300 nm.
- the inventors are considering the following.
- the maximum optical absorption coefficient (k value) of the silicon-containing resist underlayer film in the wavelength range of 220 nm to 300 nm is 0.05 or more, so that the silicon-containing resist underlayer film efficiently absorbs secondary electrons generated by EUV light. It can be well absorbed. This provides high contrast from the silicon-containing resist underlayer film to the EUV lithography resist. Then, collapse of the fine resist pattern can be prevented, and as a result, the resolution of the resist pattern can be improved.
- the optical extinction coefficient (k value) in the wavelength range of 220 nm to 300 nm can be determined using a spectroscopic ellipsometer (eg, JA Woollam, VUV-VASE VU-302).
- the k value is calculated by Cauchy's dispersion formula and point-by-point fitting.
- the upper limit of the maximum value of the optical absorption coefficient (k value) in the wavelength region of 220 nm to 300 nm is not particularly limited, but the maximum value of the optical absorption coefficient (k value) in the wavelength region of 220 nm to 300 nm is, for example, 0. 0.30 or less, 0.25 or less, or 0.20 or less.
- the silicon-containing resist underlayer film preferably has at least one of a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group.
- a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group are groups having high absorption for light with a wavelength of 200 to 300 nm.
- the silicon-containing resist underlayer film preferably has a group represented by formula (A-2a), formula (A-2b), or formula (A-2c) described below.
- Lithography using a silicon-containing resist underlayer film is not particularly limited, but EUV lithography is preferable. That is, the silicon-containing resist underlayer film is preferably a resist underlayer film for EUV lithography.
- the film thickness of the silicon-containing resist underlayer film is, for example, 10 nm to 10,000 nm, 100 nm to 2,000 nm, 200 nm to 1,000 nm, or 30 nm to 200 nm.
- the method for producing the silicon-containing resist underlayer film of the present invention is not particularly limited, but the silicon-containing resist underlayer film of the present invention may be formed from the silicon-containing resist underlayer film-forming composition of the present invention described below. is preferred.
- a first embodiment of the composition for forming a silicon-containing resist underlayer film of the present invention contains polysiloxane as component [A] and a solvent as component [C], and optionally other components. contains
- the polysiloxane as component [A] contains structural units (monomer units or repeating units) derived from hydrolyzable silane (A) having at least one of a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group.
- hydrolyzable silane A having at least one of a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group.
- “at least one of a nitrophenyl group, a methoxyphenylsulfonyl group, and a phenanthryl group” may be referred to as a "specific group”.
- a second embodiment of the composition for forming a silicon-containing resist underlayer film of the present invention comprises at least polysiloxane as component [A′] and nitrophenyl group, methoxyphenylsulfonyl group and phenanthryl group as component [B]. It contains a hydrolyzable silane (A) having any one of them, and a solvent as the [C] component, and further contains other components as necessary.
- the phenyl group of the nitrophenyl group may be substituted with a plurality of nitro groups.
- the phenyl group of the methoxyphenylsulfonyl group may be substituted with a plurality of methoxy groups.
- the sulfur atom of the methoxyphenylsulfonyl group may be bonded to an oxygen atom other than the oxygen atom constituting the sulfonyl (—SO 2 —), or may be bonded to a nitrogen atom. .
- the silicon-containing resist underlayer film formed from the composition for forming a silicon-containing resist underlayer film of the present invention has a specific group, collapse of the fine resist pattern can be prevented, and as a result, the resolution of the resist pattern can be enhanced. be able to.
- the silicon-containing resist underlayer film has a group such as a specific group that has high absorption for light with a wavelength of 200 to 300 nm, secondary electrons generated from the resist and the resist underlayer film by EUV light irradiation are efficiently absorbed. becomes possible. This provides a high contrast from the resist underlayer film to the EUV lithography resist. By doing so, collapse of the fine resist pattern can be prevented, and as a result, the resolution of the resist pattern can be improved.
- Hydrolyzable silane (A) having a specific group The specific group of the hydrolyzable silane (A) having a specific group is usually bonded to a silicon atom via a linking group.
- Hydrolyzable silane (A) may have two or more specific groups. In that case, the two or more specific groups may each be bonded to one linking group that bonds to the silicon atom, and the two or more specific groups are each bonded to the silicon atom via a different linking group. You may have The linking group is, for example, an organic group. The linking group may have an ionic bond.
- the linking group may have an ionic bond in the row of atoms connecting the specific group and the silicon atom, or from the row of atoms connecting the specific group and the silicon atom. It may have ionic bonds in the branched string of atoms.
- the number of carbon atoms in the linking group is not particularly limited, the number of carbon atoms in the linking group is preferably 1-30, more preferably 1-20.
- a linking group usually has a hydrogen atom.
- the linking group may have an oxygen atom or a nitrogen atom.
- the hydrolyzable silane (A) having a specific group is preferably a compound represented by formula (A-1) below.
- a represents an integer of 1 to 3.
- b represents an integer of 0 to 2;
- a+b represents an integer of 1-3.
- R 1 represents a group having at least one of a nitrophenyl group, a methoxyphenylsulfonyl group and a phenanthryl group and optionally having an ionic bond.
- R 2 is an optionally substituted alkyl group, an optionally substituted aryl group (excluding a phenanthryl group), an optionally substituted aralkyl group, an optionally substituted halogenated alkyl group, optionally substituted halogenated aryl group, optionally substituted halogenated aralkyl group, optionally substituted alkoxyalkyl group, optionally substituted alkoxyaryl group, optionally substituted alkoxyaralkyl group or an optionally substituted alkenyl group, or an organic group having an epoxy group, an organic group having an acryloyl group, an organic group having a methacryloyl group, an organic group having a mercapto group, or an organic group having an amino group , an organic group having an alkoxy group, an organic group having a sulfonyl group (excluding a methoxyphenylsulfonyl group), an organic group having a cyano group, or a combination of two or more thereof.
- X represents an alkoxy group, an aralkyloxy group, an acyloxy group, or a halogen atom.
- R 1 , R 2 and X is plural, the plural R 1 , R 2 and X may be the same or different.
- R 1 may have one or more specific groups.
- the number of carbon atoms in R 1 is not particularly limited, but the number of carbon atoms in R 1 is preferably 1-30, more preferably 1-20.
- R 1 usually has a hydrogen atom.
- R 1 may have an oxygen atom or a nitrogen atom in addition to the specific group and hydrogen atom.
- R 1 may have an ionic bond. When R 1 has an ionic bond, R 1 may have an ionic bond in the row of atoms connecting the specific group and the silicon atom, or from the row of atoms connecting the specific group and the silicon atom It may have ionic bonds in the branched string of atoms.
- R 1 in formula (A-1) is preferably represented by formula (A-2a), formula (A-2b), or formula (A-2c) below.
- R 11 represents a divalent organic group which may have a single bond or an ionic bond
- c represents an integer of 1 to 5
- R 12 represents a divalent organic group which may have an ionic bond.
- d represents an integer of 1 to 5
- R 13 represents a divalent organic group which may have a single bond or an ionic bond. * represents a bond.
- the number of carbon atoms in each of R 11 to R 13 is not particularly limited, but the number of carbon atoms in R 11 to R 13 is each independently preferably 1 to 25, more preferably 1 to 15. .
- R 1 may have a hydrogen atom, an oxygen atom, or a nitrogen atom in addition to the specific group.
- R 1 may have an ionic bond.
- R 1 may have an ionic bond in the row of atoms connecting the specific group and the silicon atom, or branched from the row of atoms connecting the specific group and the silicon atom You may have a nitro group in that row of atoms.
- c is preferably an integer of 1-3.
- d is preferably an integer of 1 to 3, more preferably 1.
- the nitro group is preferably bonded to the benzene ring at the ortho or para position relative to the position where R 11 is bonded, and is bonded to the benzene ring at the para position. is preferred.
- the methoxy group is preferably bonded to the benzene ring at the ortho- or para-position relative to the position where the sulfur atom is bonded, and is bonded to the benzene ring at the para-position. is preferred.
- R 11 is a single bond or represented by the following formulas (A-2-1) to (A-2-7), (A-2-10), and (A-2-11) Any one of divalent organic groups is preferred.
- R 12 is a divalent organic represented by the following formula (A-2-1), formula (A-2-3), formula (A-2-8), and formula (A-2-9) is preferably any of the groups.
- R 13 is a single bond or represented by the following formulas (A-2-1) to (A-2-7), (A-2-10), and (A-2-11) Any one of divalent organic groups is preferred.
- R 21 represents an alkylene group having 1 to 6 carbon atoms.
- R 31 represents an alkylene group having 1 to 6 carbon atoms.
- R 32 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 41 represents an alkylene group having 1 to 6 carbon atoms.
- R 42 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 51 represents an alkylene group having 1 to 6 carbon atoms.
- R 61 represents an alkylene group having 1 to 6 carbon atoms.
- R 71 represents an alkylene group having 1 to 6 carbon atoms.
- R 72 and R 73 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 81 represents an alkylene group having 1 to 6 carbon atoms.
- R 91 represents an alkylene group having 1 to 6 carbon atoms.
- R 92 and R 93 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 101 represents an alkylene group having 1 to 6 carbon atoms.
- R 111 represents an alkylene group having 1 to 6 carbon atoms.
- R 112 and R 113 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- R 121 represents an alkylene group having 1 to 6 carbon atoms.
- *1 represents a bond that bonds to Si.
- *2 represents a bond that bonds to the benzene ring in formula (A-2a), the sulfur atom in formula (A-2b), or the phenanthrene ring in formula (A-2c).
- *3 represents a bond that bonds to the carbon atom of *4 or *5.
- the amino group (-N( R42 )-) in the formula (A-2-3) may be cationized.
- the amino group (-N( R42 )-) in formula (A-2-3) is cationized to form a nitrate. You may have
- the alkylene group having 1 to 6 carbon atoms in R 21 , R 31 , R 41 , R 51 , R 61 , R 71 , R 81 , R 91 , R 101 , R 111 and R 121 may be linear or It may be branched or any.
- Examples of the alkylene group having 1 to 6 carbon atoms include linear alkylene groups such as methylene, ethylene, trimethylene, tetramethylene, pentamethylene and hexamethylene. Among these, a methylene group, an ethylene group, a trimethylene group, and a tetramethylene group are preferred.
- the alkyl group having 1 to 4 carbon atoms in R 32 , R 42 , R 73 , R 92 , R 93 , R 112 and R 113 may be linear or branched.
- alkyl groups having 1 to 4 carbon atoms include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, s-butyl group and t-butyl group.
- R 32 , R 42 , R 72 , R 73 , R 92 , R 93 , R 112 and R 113 are preferably hydrogen atom, methyl group and ethyl group.
- the alkyl group may be linear, branched, or cyclic, and the number of carbon atoms is not particularly limited, but is preferably 40 or less, more preferably 30 or less, and still more preferably 20. 10 or less, more preferably 10 or less.
- alkyl group specific examples of linear or branched alkyl groups include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, s-butyl group, t-butyl group, n-pentyl group, 1-methyl-n-butyl group, 2-methyl-n-butyl group, 3-methyl-n-butyl group, 1,1-dimethyl-n-propyl group, 1,2-dimethyl-n-propyl group, 2,2-dimethyl-n-propyl group, 1-ethyl-n-propyl group, n-hexyl group, 1-methyl-n-pentyl group, 2-methyl-n -pentyl group, 3-methyl-n-pentyl group, 4-methyl-n-pentyl group, 1,1-dimethyl-n-butyl group, 1,2-dimethyl-n-butyl group, 1,3-
- cyclic alkyl groups include cyclopropyl, cyclobutyl, 1-methyl-cyclopropyl, 2-methyl-cyclopropyl, cyclopentyl, 1-methyl-cyclobutyl, 2-methyl-cyclobutyl, 3 -methyl-cyclobutyl, 1,2-dimethyl-cyclopropyl, 2,3-dimethyl-cyclopropyl, 1-ethyl-cyclopropyl, 2-ethyl-cyclopropyl, cyclohexyl, 1-methyl-cyclopentyl group, 2-methyl-cyclopentyl group, 3-methyl-cyclopentyl group, 1-ethyl-cyclobutyl group, 2-ethyl-cyclobutyl group, 3-ethyl-cyclobutyl group, 1,2-dimethyl-cyclobutyl group, 1,3- dimethyl-cyclobutyl group, 2,2-dimethyl-cyclobutyl group, 2,3-dimethyl-cyclobutyl group
- the aryl group includes a phenyl group, a monovalent group derived by removing one hydrogen atom from a condensed ring aromatic hydrocarbon compound, and 1 derived by removing one hydrogen atom from a ring-linked aromatic hydrocarbon compound.
- the number of carbon atoms is not particularly limited, but is preferably 40 or less, more preferably 30 or less, and still more preferably 20 or less.
- aryl groups include aryl groups having 6 to 20 carbon atoms, examples of which include phenyl, 1-naphthyl, 2-naphthyl, 1-anthryl, 2-anthryl, 9-anthryl, -naphthacenyl group, 2-naphthacenyl group, 5-naphthacenyl group, 2-chrysenyl group, 1-pyrenyl group, 2-pyrenyl group, pentacenyl group, benzopyrenyl group, triphenylenyl group; biphenyl-2-yl group (o-biphenylyl group) , biphenyl-3-yl group (m-biphenylyl group), biphenyl-4-yl group (p-biphenylyl group), p-terphenyl-4-yl group, metaterphenyl-4-yl group, orthoterphenyl-4 -yl group, 1,1′-binaphth
- An aralkyl group is an alkyl group substituted with an aryl group, and specific examples of such an aryl group and an alkyl group are the same as those described above.
- the number of carbon atoms in the aralkyl group is not particularly limited, it is preferably 40 or less, more preferably 30 or less, and still more preferably 20 or less.
- aralkyl groups include phenylmethyl group (benzyl group), 2-phenylethylene group, 3-phenyl-n-propyl group, 4-phenyl-n-butyl group, 5-phenyl-n-pentyl group, 6 -phenyl-n-hexyl group, 7-phenyl-n-heptyl group, 8-phenyl-n-octyl group, 9-phenyl-n-nonyl group, 10-phenyl-n-decyl group and the like, but these is not limited to
- Halogenated alkyl groups, halogenated aryl groups, and halogenated aralkyl groups are alkyl groups, aryl groups, and aralkyl groups, respectively, substituted with one or more halogen atoms, and such alkyl groups, aryl groups, and aralkyl Specific examples of the groups are the same as those mentioned above.
- Halogen atoms include fluorine, chlorine, bromine, and iodine atoms.
- halogenated alkyl groups include monofluoromethyl group, difluoromethyl group, trifluoromethyl group, bromodifluoromethyl group, 2-chloroethyl group, 2-bromoethyl group, 1,1-difluoroethyl group, 2,2 ,2-trifluoroethyl group, 1,1,2,2-tetrafluoroethyl group, 2-chloro-1,1,2-trifluoroethyl group, pentafluoroethyl group, 3-bromopropyl group, 2,2 , 3,3-tetrafluoropropyl group, 1,1,2,3,3,3-hexafluoropropyl group, 1,1,1,3,3,3-hexafluoropropan-2-yl
- halogenated aryl groups include 2-fluorophenyl group, 3-fluorophenyl group, 4-fluorophenyl group, 2,3-difluorophenyl group, 2,4-difluorophenyl group and 2,5-difluorophenyl group, 2,6-difluorophenyl group, 3,4-difluorophenyl group, 3,5-difluorophenyl group, 2,3,4-trifluorophenyl group, 2,3,5-trifluorophenyl group, 2, 3,6-trifluorophenyl group, 2,4,5-trifluorophenyl group, 2,4,6-trifluorophenyl group, 3,4,5-trifluorophenyl group, 2,3,4,5- tetrafluorophenyl group,
- halogenated aralkyl group is not particularly limited, it is preferably 40 or less, more preferably 30 or less, and still more preferably 20 or less.
- Specific examples of halogenated aralkyl groups include 2-fluorobenzyl, 3-fluorobenzyl, 4-fluorobenzyl, 2,3-difluorobenzyl, 2,4-difluorobenzyl and 2,5-difluorobenzyl.
- fluorine atom (fluoro group) in these groups is arbitrarily substituted with a chlorine atom (chloro group), a bromine atom (bromo group), or an iodine atom (iodo group), but is not limited thereto.
- Alkoxyalkyl, alkoxyaryl, and alkoxyaralkyl groups are alkyl, aryl, and aralkyl groups, respectively, substituted with one or more alkoxy groups, and specific examples of such alkyl, aryl, and aralkyl groups are Examples are the same as those mentioned above.
- alkoxy groups as substituents include alkoxy groups having at least one of linear, branched and cyclic alkyl moieties having 1 to 20 carbon atoms.
- linear or branched alkoxy groups include methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy and t-butoxy groups.
- n-pentyloxy group 1-methyl-n-butoxy group, 2-methyl-n-butoxy group, 3-methyl-n-butoxy group, 1,1-dimethyl-n-propoxy group, 1,2-dimethyl- n-propoxy group, 2,2-dimethyl-n-propoxy group, 1-ethyl-n-propoxy group, n-hexyloxy group, 1-methyl-n-pentyloxy group, 2-methyl-n-pentyloxy group, 3- methyl-n-pentyloxy group, 4-methyl-n-pentyloxy group, 1,1-dimethyl-n-butoxy group, 1,2-dimethyl-n-butoxy group, 1,3-dimethyl-n-butoxy group, 2 , 2-dimethyl-n-butoxy group, 2,3-dimethyl-n-butoxy group, 3,3-dimethyl-n-butoxy group, 1-ethyl-n-butoxy group, 2-ethyl-n-butoxy group, 1,1,2-trimethyl
- cyclic alkoxy groups include cyclopropoxy, cyclobutoxy, 1-methyl-cyclopropoxy, 2-methyl-cyclopropoxy, cyclopentyloxy, 1-methyl-cyclobutoxy, 2-methyl- cyclobutoxy, 3-methyl-cyclobutoxy, 1,2-dimethyl-cyclopropoxy, 2,3-dimethyl-cyclopropoxy, 1-ethyl-cyclopropoxy, 2-ethyl-cyclopropoxy, cyclohexyloxy group, 1-methyl-cyclopentyloxy group, 2-methyl-cyclopentyloxy group, 3-methyl-cyclopentyloxy group, 1-ethyl-cyclobutoxy group, 2-ethyl-cyclobutoxy group, 3-ethyl-cyclo butoxy group, 1,2-dimethyl-cyclobutoxy group, 1,3-dimethyl-cyclobutoxy group, 2,2-dimethyl-cyclobutoxy group, 2,3-dimethyl-cyclobutoxy group, 2,4-dimethyl-cyclobut
- alkoxyalkyl groups include lower (about 5 or less carbon atoms) alkyloxy lower (about 5 carbon atoms) such as methoxymethyl, ethoxymethyl, 1-ethoxyethyl, 2-ethoxyethyl, ethoxymethyl about 5 or less) alkyl groups and the like, but are not limited thereto.
- alkoxyaryl groups include 2-methoxyphenyl, 3-methoxyphenyl, 4-methoxyphenyl, 2-(1-ethoxy)phenyl, 3-(1-ethoxy)phenyl, 4-( 1-ethoxy)phenyl group, 2-(2-ethoxy)phenyl group, 3-(2-ethoxy)phenyl group, 4-(2-ethoxy)phenyl group, 2-methoxynaphthalen-1-yl group, 3-methoxy naphthalene-1-yl group, 4-methoxynaphthalene-1-yl group, 5-methoxynaphthalene-1-yl group, 6-methoxynaphthalene-1-yl group, 7-methoxynaphthalene-1-yl group and the like. but not limited to these.
- Specific examples of the alkoxyaralkyl group include, but are not limited to, 3-(methoxyphenyl)benzyl group, 4-(methoxyphenyl)benzyl group and the
- the alkenyl group may be linear or branched, and the number of carbon atoms thereof is not particularly limited, but is preferably 40 or less, more preferably 30 or less, still more preferably 20 or less, It is more preferably 10 or less.
- Specific examples of alkenyl groups include ethenyl (vinyl), 1-propenyl, 2-propenyl, 1-methyl-1-ethenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2 -methyl-1-propenyl group, 2-methyl-2-propenyl group, 1-ethylethenyl group, 1-methyl-1-propenyl group, 1-methyl-2-propenyl group, 1-pentenyl group, 2-pentenyl group, 3-pentenyl group, 4-pentenyl group, 1-n-propylethenyl group, 1-methyl-1-butenyl group, 1-methyl-2-butenyl group, 1-methyl-3-butenyl group, 2-ethyl- 2-propenyl
- substituents for the alkyl group, aryl group, aralkyl group, halogenated alkyl group, halogenated aryl group, halogenated aralkyl group, alkoxyalkyl group, alkoxyaryl group, alkoxyaralkyl group, and alkenyl group described above include , alkyl group, aryl group, aralkyl group, halogenated alkyl group, halogenated aryl group, halogenated aralkyl group, alkoxyalkyl group, aryloxy group, alkoxyaryl group, alkoxyaralkyl group, alkenyl group, alkoxy group, aralkyloxy group etc., and specific examples thereof and suitable numbers of carbon atoms thereof are the same as those described above or below.
- the aryloxy group mentioned in the substituent group is a group to which an aryl group is bonded through an oxygen atom (--O--), and specific examples of such an aryl group are the same as those mentioned above.
- the number of carbon atoms in the aryloxy group is not particularly limited, but is preferably 40 or less, more preferably 30 or less, and still more preferably 20 or less. -yloxy groups and the like, but are not limited to these.
- the substituents may be combined to form a ring.
- the organic group having an epoxy group includes glycidoxymethyl group, glycidoxyethyl group, glycidoxypropyl group, glycidoxybutyl group, epoxycyclohexyl group and the like.
- Organic groups having acryloyl groups include acryloyloxymethyl groups, acryloyloxyethyl groups, acryloyloxypropyl groups and the like.
- the organic group having a methacryloyl group includes a methacryloyloxymethyl group, a methacryloyloxyethyl group, a methacryloyloxypropyl group, and the like.
- Organic groups having a mercapto group include mercaptoethyl, mercaptobutyl, mercaptohexyl, mercaptooctyl, and mercaptophenyl groups.
- the organic group having an amino group includes, but is not limited to, an amino group, an aminomethyl group, an aminoethyl group, an aminophenyl group, a dimethylaminoethyl group, a dimethylaminopropyl group, and the like. Further details of the organic group having an amino group will be described later.
- Examples of the organic group having an alkoxy group include, but are not limited to, methoxymethyl group and methoxyethyl group.
- organic groups having a sulfonyl group include, but are not limited to, sulfonylalkyl groups and sulfonylaryl groups.
- the organic group having a cyano group includes cyanoethyl group, cyanopropyl group, cyanophenyl group, thiocyanate group and the like.
- the organic group having an amino group includes an organic group having at least one of a primary amino group, a secondary amino group, and a tertiary amino group.
- a hydrolytic condensate obtained by hydrolyzing a hydrolyzable silane having a tertiary amino group with a strong acid to form a counter cation having a tertiary ammonium group can be preferably used.
- the organic group can contain a heteroatom such as an oxygen atom or a sulfur atom in addition to the nitrogen atom constituting the amino group.
- a preferable example of the organic group having an amino group is a group represented by the following formula (A1).
- R 101 and R 102 each independently represent a hydrogen atom or a hydrocarbon group
- L each independently represents an optionally substituted alkylene group. * represents a bond.
- Hydrocarbon groups include, but are not limited to, alkyl groups, alkenyl groups, aryl groups, and the like. Specific examples of these alkyl groups, alkenyl groups and aryl groups are the same as those described above for R 2 .
- the alkylene group may be linear or branched, and usually has 1 to 10 carbon atoms, preferably 1 to 5 carbon atoms.
- Examples thereof include linear alkylene groups such as methylene, ethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, nonamethylene and decamethylene.
- the organic group having an amino group includes, but is not limited to, an amino group, an aminomethyl group, an aminoethyl group, an aminophenyl group, a dimethylaminoethyl group, a dimethylaminopropyl group, and the like.
- the aralkyloxy group is a monovalent group derived by removing a hydrogen atom from the hydroxy group of aralkyl alcohol, and specific examples of the aralkyl group in the aralkyloxy group are the same as those mentioned above.
- the number of carbon atoms in the aralkyloxy group is not particularly limited, it can be, for example, 40 or less, preferably 30 or less, more preferably 20 or less.
- Specific examples of aralkyloxy groups include phenylmethyloxy group (benzyloxy group), 2-phenylethyleneoxy group, 3-phenyl-n-propyloxy group, 4-phenyl-n-butyloxy group and 5-phenyl-n.
- -pentyloxy group 6-phenyl-n-hexyloxy group, 7-phenyl-n-heptyloxy group, 8-phenyl-n-octyloxy group, 9-phenyl-n-nonyloxy group, 10-phenyl-n- Examples include, but are not limited to, a decyloxy group and the like.
- the acyloxy group is a monovalent group derived by removing a hydrogen atom from the carboxyl group (—COOH) of a carboxylic acid compound, typically from the carboxyl group of an alkylcarboxylic acid, an arylcarboxylic acid or an aralkylcarboxylic acid.
- Examples include, but are not limited to, alkylcarbonyloxy groups, arylcarbonyloxy groups, or aralkylcarbonyloxy groups derived by removing a hydrogen atom.
- Specific examples of the alkyl group, aryl group and aralkyl group in such alkylcarboxylic acid, arylcarboxylic acid and aralkylcarboxylic acid are the same as those mentioned above.
- acyloxy groups include acyloxy groups having 2 to 20 carbon atoms, such as methylcarbonyloxy, ethylcarbonyloxy, n-propylcarbonyloxy, i-propylcarbonyloxy and n-butylcarbonyl.
- hydrolyzable silane (A) having a specific group examples include the following compounds, but the hydrolyzable silane (A) having a specific group is not limited to these compounds.
- R represents a methyl group or an ethyl group.
- the content of the hydrolyzable silane (A) having a specific group as the component [B] in the composition for forming a silicon-containing resist underlayer film is determined from the viewpoint of sufficiently obtaining the effects of the present invention.
- [A'] is preferably 0.01 to 100 parts by mass, more preferably 0.05 to 50 parts by mass, still more preferably 0.1 to 30 parts by mass, with respect to 100 parts by mass of polysiloxane, especially Preferably, it is 1 to 20 parts by mass.
- Polysiloxane as the [A] component is not particularly limited as long as it is a polymer containing structural units derived from hydrolyzable silane (A) having a specific group and having a siloxane bond.
- Polysiloxane as the [A'] component is not particularly limited as long as it is a polymer having a siloxane bond.
- Polysiloxane as the [A'] component may be polysiloxane as the [A] component.
- the polysiloxane may be a modified polysiloxane in which some of the silanol groups are modified, such as a modified polysiloxane in which some of the silanol groups are alcohol-modified or acetal-protected.
- Polysiloxane may be, for example, a hydrolytic condensate of a hydrolyzable silane, or a modified product in which at least part of the silanol groups of the hydrolytic condensate is alcohol-modified or acetal-protected (hereinafter referred to as It may be referred to as a “modified product of hydrolytic condensate”.).
- the hydrolyzable silane associated with the hydrolytic condensate can contain one or more hydrolyzable silanes.
- the polysiloxane as the [A] component or [A'] component may have any structure having a cage-type, ladder-type, straight-chain or branched main chain. Furthermore, commercially available polysiloxane can be used as polysiloxane as the [A'] component.
- the "hydrolytic condensate" of the hydrolyzable silane that is, the product of hydrolytic condensation, includes not only the polyorganosiloxane polymer, which is a condensate in which the condensation has been completely completed, but also Also included are polyorganosiloxane polymers that are incomplete partial hydrolytic condensates.
- Such a partially hydrolyzed condensate is also a polymer obtained by hydrolysis and condensation of a hydrolyzable silane, similar to the condensate in which the condensation is completely completed, but it stops at partial hydrolysis and condenses. There are no Si--OH groups remaining.
- the silicon-containing resist underlayer film-forming composition contains uncondensed hydrolysates (complete hydrolysates, partial hydrolysates) and monomers (hydrolyzable silanes).
- hydrolyzable silane may be simply referred to as "silane compound”.
- polysiloxane as the [A] component examples include hydrolytic condensates of hydrolyzable silanes containing a hydrolyzable silane (A) having a specific group, or modified products thereof.
- polysiloxane for example, a hydrolytic condensation of a hydrolyzable silane (A) having a specific group and a hydrolyzable silane containing at least one hydrolyzable silane represented by the following formula (1): products or modifications thereof.
- polysiloxane as component [A'] include hydrolytic condensates of hydrolyzable silanes containing at least one hydrolyzable silane represented by the following formula (1), and modified products thereof.
- R 1 is a group bonded to a silicon atom and is independently an optionally substituted alkyl group or an optionally substituted aryl group (excluding a phenanthryl group). ), optionally substituted aralkyl group, optionally substituted halogenated alkyl, optionally substituted halogenated aryl group, optionally substituted halogenated aralkyl group, optionally substituted alkoxy represents an alkyl group, an optionally substituted alkoxyaryl group, an optionally substituted alkoxyaralkyl group, or an optionally substituted alkenyl group, or an organic group having an epoxy group or an organic group having an acryloyl group , an organic group having a methacryloyl group, an organic group having a mercapto group, an organic group having an amino group, an organic group having an alkoxy group, an organic group having a sulfonyl group (excluding a methoxyphenylsulfonyl group), or
- each group and atom in R 1 in formula (1) and preferred numbers of carbon atoms thereof include the groups and numbers of carbon atoms described above for R 2 in formula (A-1). can.
- Specific examples of each group and atom in R 2 in formula (1) and their preferred number of carbon atoms include the groups and atoms and the number of carbon atoms described above for X in formula (A-1). can be done.
- hydrolyzable silane represented by Formula (1) includes tetramethoxysilane, tetrachlorosilane, tetraacetoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetra-i-propoxysilane, tetra-n -butoxysilane, methyltrimethoxysilane, methyltrichlorosilane, methyltriacetoxysilane, methyltriethoxysilane, methyltripropoxysilane, methyltributoxysilane, methyltriamyloxysilane, methyltriphenoxysilane, methyltribenzyloxysilane, methyltriphenethyloxysilane, glycidoxymethyltrimethoxysilane, glycidoxymethyltriethoxysilane, ⁇ -glycid
- T independently represents an alkoxy group, an acyloxy group, or a halogen group, for example, preferably represents a methoxy group or an ethoxy group.
- polysiloxane [A] a hydrolyzable silane (A) having a specific group, and a hydrolytic condensate of a hydrolyzable silane containing a hydrolyzable silane represented by the following formula (2) or a modified product thereof can be mentioned.
- [A] polysiloxane a hydrolyzable silane (A) having a specific group, a hydrolyzable silane represented by the formula (1), and a hydrolyzable silane represented by the following formula (2), Hydrolytic condensates of hydrolyzable silanes and modified products thereof can be mentioned.
- hydrolyzable silane represented by formula (1) As polysiloxane, together with the hydrolyzable silane represented by formula (1), or instead of the hydrolyzable silane represented by formula (1), a hydrolyzate represented by the following formula (2) hydrolytic condensates of hydrolyzable silanes, including silanes, or modified products thereof.
- R 3 is a group bonded to a silicon atom and is independently an optionally substituted alkyl group or optionally substituted aryl group (excluding a phenanthryl group). ), optionally substituted aralkyl group, optionally substituted halogenated alkyl group, optionally substituted halogenated aryl group, optionally substituted halogenated aralkyl group, optionally substituted represents an alkoxyalkyl group, an optionally substituted alkoxyaryl group, an optionally substituted alkoxyaralkyl group, or an optionally substituted alkenyl group, or an organic group having an epoxy group, an organic group having an acryloyl group an organic group having a methacryloyl group, an organic group having a mercapto group, an organic group having an amino group, an organic group having an alkoxy group, an organic group having a sulfonyl group (excluding methoxyphenylsulfonyl group), or cyano group
- R 4 is a group or atom bonded to a silicon atom and independently represents an alkoxy group, an aralkyloxy group, an acyloxy group, or a halogen atom.
- R 5 is a group bonded to a silicon atom and independently represents an alkylene group or an arylene group. b represents 0 or 1, c represents 0 or 1;
- each group and atom in R 3 and preferred numbers of carbon atoms thereof include the groups and numbers of carbon atoms described above for R 2 in formula (A-1).
- Specific examples of each group and atom in R 4 and the preferred number of carbon atoms thereof include the groups and atoms and the number of carbon atoms described above for X in formula (A-1).
- Specific examples of the alkylene group for R 5 include linear groups such as methylene, ethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, nonamethylene and decamethylene groups.
- alkylene group 1-methyltrimethylene group, 2-methyltrimethylene group, 1,1-dimethylethylene group, 1-methyltetramethylene group, 2-methyltetramethylene group, 1,1-dimethyltrimethylene group, 1, 2-dimethyltrimethylene group, 2,2-dimethyltrimethylene group, alkylene group such as branched alkylene group such as 1-ethyltrimethylene group, methanetriyl group, ethane-1,1,2-triyl group, ethane- 1,2,2-triyl group, ethane-2,2,2-triyl group, propane-1,1,1-triyl group, propane-1,1,2-triyl group, propane-1,2,3- triyl group, propane-1,2,2-triyl group, propane-1,1,3-triyl group, butane-1,1,1-triyl group, butane-1,1,2-triyl group, butane-1 , 1,3-triyl group, butane-1,2,3-triyl group, but
- arylene group for R 5 include 1,2-phenylene group, 1,3-phenylene group, 1,4-phenylene group; 1,5-naphthalenediyl group, 1,8-naphthalenediyl group, 2, 6-naphthalenediyl group, 2,7-naphthalenediyl group, 1,2-anthracenediyl group, 1,3-anthracenediyl group, 1,4-anthracenediyl group, 1,5-anthracenediyl group, 1,6- anthracenediyl group, 1,7-anthracenediyl group, 1,8-anthracenediyl group, 2,3-anthracenediyl group, 2,6-anthracenediyl group, 2,7-anthracenediyl group, 2,9-anthracenediyl A group derived by removing two hydrogen atoms on the aromatic ring of a condensed ring aromatic hydrocarbon compound such as a 2,10-anth
- hydrolyzable silanes represented by formula (2) include methylenebistrimethoxysilane, methylenebistrichlorosilane, methylenebistriacetoxysilane, ethylenebistriethoxysilane, ethylenebistrichlorosilane, ethylenebistriacetoxysilane, and propylenebistriethoxysilane.
- hydrolyzable silane (A) having a specific group a hydrolyzable silane represented by formula (1) and/or a hydrolyzable silane represented by formula (2), together with the following Hydrolytic condensates of hydrolyzable silanes or modified products thereof, including other hydrolyzable silanes listed in .
- A' As polysiloxane, a hydrolyzable silane represented by formula (1) and/or a hydrolyzable silane represented by formula (2), and other hydrolyzable silanes listed below, Hydrolytic condensates of decomposable silanes and modified products thereof can be mentioned.
- Other hydrolyzable silanes include, but are not limited to, silane compounds having an onium group in the molecule and silane compounds having a cyclic urea skeleton in the molecule.
- silane compound having an onium group in the molecule hydrolyzable organosilane
- a silane compound having an onium group in its molecule is expected to effectively and efficiently promote the cross-linking reaction of hydrolyzable silane.
- a preferred example of a silane compound having an onium group in its molecule is represented by formula (3).
- R 11 is a group bonded to a silicon atom and represents an onium group or an organic group having the same.
- R 12 is a group that binds to a silicon atom and is independently of each other an optionally substituted alkyl group, an optionally substituted aryl group (excluding a phenanthryl group), a substituted optionally substituted aralkyl group, optionally substituted halogenated alkyl group, optionally substituted halogenated aryl group, optionally substituted halogenated aralkyl group, optionally substituted alkoxyalkyl group, substituted represents an optionally substituted alkoxyaryl group, an optionally substituted alkoxyaralkyl group, or an optionally substituted alkenyl group, or an organic group having an epoxy group, an organic group having an acryloyl group, or a methacryloyl group It represents an organic group, an organic group having a mercapto group, an organic group having an amino group, an organic group having a
- R 13 is a silicon-bonded group or atom and independently represents an alkoxy group, an aralkyloxy group, an acyloxy group, or a halogen atom.
- f represents 1 or 2
- g represents 0 or 1
- Examples of the number of carbon atoms include those described above for R 2 in formula (A-1) for R 12 and those described above for X in formula (A-1) for R 13 . can.
- the onium group include a cyclic ammonium group and a chain ammonium group, preferably a tertiary ammonium group or a quaternary ammonium group. That is, preferred specific examples of the onium group or an organic group having it include a cyclic ammonium group or a chain ammonium group, or an organic group having at least one of these, a tertiary ammonium group or a quaternary ammonium group Or an organic group having at least one of these is preferred.
- the onium group is a cyclic ammonium group
- the nitrogen atoms constituting the ammonium group also serve as atoms constituting the ring. In this case, the nitrogen atom and the silicon atom constituting the ring are bonded directly or via a divalent linking group, and the carbon atom and the silicon atom constituting the ring are directly or via a divalent linking group.
- the silicon-bonded group R 11 is a heteroaromatic cyclic ammonium group represented by the following formula (S1).
- a 1 , A 2 , A 3 and A 4 each independently represent a group represented by any one of the following formulas (J1) to (J3), and A 1 to A At least one of 4 is a group represented by the following formula (J2), and depending on which of A 1 to A 4 the silicon atom in formula (3) bonds to, the ring formed is aromatic It is determined whether the bond between each of A 1 to A 4 and the atoms adjacent to each of them and forming a ring together is a single bond or a double bond, so as to indicate the family property.
- * represents a bond.
- each R 10 is independently a single bond, a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, a halogenated aryl group, a halogenated aralkyl group, or Representing an alkenyl group, specific examples of an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, a halogenated aryl group, a halogenated aralkyl group and an alkenyl group, and their preferred number of carbon atoms are the same as those described above. mentioned. * represents a bond.
- R 14 independently represents an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, a halogenated aryl group, a halogenated aralkyl group, an alkenyl group or a hydroxy group, and R 14 is
- the two R 14 may be bonded to each other to form a ring, and the ring formed by the two R 14 may be a bridged ring structure.
- the cyclic ammonium group has an adamantane ring, a norbornene ring, a spiro ring and the like.
- alkyl groups aryl groups, aralkyl groups, halogenated alkyl groups, halogenated aryl groups, halogenated aralkyl groups and alkenyl groups and their preferred numbers of carbon atoms are the same as those described above. .
- n 1 is an integer of 1 to 8
- m 1 is 0 or 1
- m 2 is a positive number from 0 or 1 to the maximum number of monocyclic or polycyclic substitutable is an integer of When m 1 is 0, a (4+n 1 ) membered ring containing A 1 to A 4 is constructed.
- a 5-membered ring when n1 is 1 a 6-membered ring when n1 is 2 , a 7-membered ring when n1 is 3 , an 8-membered ring when n1 is 4 ,
- n1 is 5
- it is a 9-membered ring
- n1 is 6
- it is a 10-membered ring
- n1 is 7
- it is an 11-membered ring
- n1 is 8 it is a 12-membered ring.
- a condensed ring is formed by condensing a (4+n 1 )-membered ring containing A 1 to A 3 with a 6-membered ring containing A 4 .
- a 1 to A 4 may or may not have a hydrogen atom on a ring-constituting atom, depending on which of the formulas (J1) to (J3), but A When 1 to A 4 have a hydrogen atom on a ring-constituting atom, the hydrogen atom may be substituted with R 14 .
- ring-constituting atoms other than the ring-constituting atoms in A 1 to A 4 may be substituted with R 14 .
- m2 is selected from integers from 0 or 1 to the maximum number of monocyclic or polycyclic substitutable numbers.
- the bond of the heteroaromatic cyclic ammonium group represented by formula (S1) is present at any carbon atom or nitrogen atom present in such a monocyclic or condensed ring and is directly bonded to a silicon atom, or A linking group is combined to form an organic group having a cyclic ammonium, which is bonded to a silicon atom.
- Such linking groups include, but are not limited to, alkylene groups, arylene groups, alkenylene groups, and the like. Specific examples of the alkylene group and arylene group and their preferred number of carbon atoms are the same as those described above.
- An alkenylene group is a divalent group derived by removing one more hydrogen atom from an alkenyl group, and specific examples of such alkenyl groups are the same as those described above.
- the number of carbon atoms in the alkenylene group is not particularly limited, it is preferably 40 or less, more preferably 30 or less, and still more preferably 20 or less. Specific examples thereof include, but are not limited to, vinylene, 1-methylvinylene, propenylene, 1-butenylene, 2-butenylene, 1-pentenylene, 2-pentenylene groups and the like.
- silane compound (hydrolyzable organosilane) represented by formula (3) having a heteroaromatic cyclic ammonium group represented by formula (S1) include the following formulas (I-1) to (I-50 ), but not limited thereto.
- the silicon-bonded group R 11 in formula (3) can be a heteroaliphatic cyclic ammonium group represented by the following formula (S2).
- a 5 , A 6 , A 7 and A 8 each independently represent a group represented by any one of the following formulas (J4) to (J6), and A 5 to A At least one of 8 is a group represented by the following formula (J5).
- Each of A 5 to A 8 and each adjacent It is determined whether the bond between the atoms forming the ring together is a single bond or a double bond. * represents a bond.
- each R 10 is independently a single bond, a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, a halogenated aryl group, a halogenated aralkyl group, or Represents an alkenyl group, specific examples of an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, a halogenated aryl group, a halogenated aralkyl group and an alkenyl group, and their preferred number of carbon atoms are the same as those described above. things are mentioned. * represents a bond.
- R 15 independently represents an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, a halogenated aryl group, a halogenated aralkyl group, an alkenyl group or a hydroxy group, and R 15 is When two or more R 15 are present, the two R 15 may be bonded to each other to form a ring, and the ring formed by the two R 15 may be a bridged ring structure. , the cyclic ammonium group has an adamantane ring, a norbornene ring, a spiro ring and the like.
- alkyl group aryl group, aralkyl group, halogenated alkyl group, halogenated aryl group, halogenated aralkyl group and alkenyl group and their preferred number of carbon atoms are the same as those mentioned above.
- n 2 is an integer of 1 to 8
- m 3 is 0 or 1
- m 4 is a positive number from 0 or 1 to the maximum number of monocyclic or polycyclic substitutable is an integer of When m 3 is 0, a (4+n 2 ) membered ring containing A 5 -A 8 is constructed.
- n2 is 5
- n2 is 6 it is a 10-membered ring
- n2 is 7 it is an 11-membered ring
- n2 is 8 it is a 12-membered ring.
- m 3 1, a condensed ring is formed by condensing a (4+n 2 )-membered ring containing A 5 to A 7 with a 6-membered ring containing A 8 .
- a 5 to A 8 may or may not have a hydrogen atom on a ring-constituting atom, but A When 5 to A 8 have a hydrogen atom on a ring-constituting atom, the hydrogen atom may be substituted with R 15 . In addition, ring-constituting atoms other than the ring-constituting atoms in A 5 to A 8 may be substituted with R 15 . Under these circumstances, as described above, m4 is selected from integers from 0 or 1 to the maximum number of monocyclic or polycyclic substitutable numbers.
- the bond of the heteroaliphatic cyclic ammonium group represented by formula (S2) is present at any carbon atom or nitrogen atom present in such a monocyclic or condensed ring and is directly bonded to the silicon atom, or A linking group is combined to form an organic group having a cyclic ammonium, which is bonded to a silicon atom.
- a linking group includes an alkylene group, an arylene group, or an alkenylene group, and specific examples of the alkylene group, arylene group, and alkenylene group and the preferred number of carbon atoms thereof are the same as those described above.
- silane compound (hydrolyzable organosilane) represented by the formula (3) having a heteroaliphatic cyclic ammonium group represented by the formula (S2) include the following formulas (II-1) to (II- 30), but not limited thereto.
- R 11 which is a silicon-bonded group in formula (3), can be a chain ammonium group represented by formula (S3) below.
- each R 10 independently represents a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, a halogenated alkyl group, a halogenated aryl group, a halogenated aralkyl group or an alkenyl group, an alkyl group, Specific examples of the aryl group, aralkyl group, halogenated alkyl group, halogenated aryl group, halogenated aralkyl group and alkenyl group and their preferred number of carbon atoms are the same as those mentioned above.
- * represents a bond.
- the chain ammonium group represented by formula (S3) is directly bonded to a silicon atom, or is bonded to a linking group to form an organic group having a chain ammonium group, which is bonded to a silicon atom.
- a linking group include an alkylene group, an arylene group and an alkenylene group, and specific examples of the alkylene group, arylene group and alkenylene group are the same as those described above.
- silane compound (hydrolyzable organosilane) represented by formula (3) having a chain ammonium group represented by formula (S3) include the following formulas (III-1) to (III-28). Examples include, but are not limited to, silanes represented by.
- Hydrolyzable organosilanes having a cyclic urea skeleton in the molecule include, for example, hydrolyzable organosilanes represented by the following formula (4-1).
- R 401 is a group bonded to a silicon atom and independently represents a group represented by formula (4-2) below.
- R 402 is a group bonded to a silicon atom, optionally substituted alkyl group, optionally substituted aryl group (excluding phenanthryl group), optionally substituted aralkyl group, substituted optionally substituted halogenated alkyl group, optionally substituted halogenated aryl group, optionally substituted halogenated aralkyl group, optionally substituted alkoxyalkyl group, optionally substituted alkoxyaryl optionally substituted alkoxyaralkyl group or optionally substituted alkenyl group, or an organic group having an epoxy group, an organic group having an acryloyl group, an organic group having a methacryloyl group, or a mercapto group or an organic group having a cyano group, or a combination of two or more thereof.
- R 403 is a group or atom bonded to a silicon atom and independently represents an alkoxy group, an aralkyloxy group, an acyloxy group or a halogen atom.
- x is 1 or 2
- y is 0 or 1, and satisfies x+y ⁇ 2.
- R 402 alkyl group, aryl group, aralkyl group, halogenated alkyl group, halogenated aryl group, halogenated aralkyl group, alkoxyalkyl group, alkoxyaryl group, alkoxyaralkyl group, alkenyl group, and an organic group having an epoxy group , an organic group having an acryloyl group, an organic group having a methacryloyl group, an organic group having a mercapto group, an organic group having a cyano group, and an alkoxy group, an aralkyloxy group, an acyloxy group and a halogen atom of R 403 , and these Specific examples of substituents, suitable numbers of carbon atoms, etc. are the same as those described above for R 2 and X in formula (A-1).
- R 404 is each independently a hydrogen atom, an optionally substituted alkyl group, an optionally substituted alkenyl group, an epoxy group-containing organic group, or a sulfonyl group (with the proviso that , excluding a methoxyphenylsulfonyl group), and R 405 is independently an alkylene group, a hydroxyalkylene group, a sulfide bond (-S-), an ether bond (-O-) or an ester bond represents (-CO-O- or -O-CO-).
- * represents a bond.
- the optionally substituted alkyl group of R 404 is preferably an alkyl group having a terminal hydrogen atom substituted with a vinyl group, and specific examples thereof Examples include allyl group, 2-vinylethyl group, 3-vinylpropyl group, 4-vinylbutyl group and the like.
- the organic group having a sulfonyl group is not particularly limited as long as it contains a sulfonyl group, optionally substituted alkylsulfonyl group, optionally substituted arylsulfonyl group, optionally substituted aralkylsulfonyl group.
- optionally substituted halogenated alkylsulfonyl group optionally substituted halogenated arylsulfonyl group, optionally substituted halogenated aralkylsulfonyl group, optionally substituted alkoxyalkylsulfonyl group, substituted optionally substituted alkoxyarylsulfonyl group, optionally substituted alkoxyaralkylsulfonyl group, optionally substituted alkenylsulfonyl group, and the like.
- Specific examples and preferred number of carbon atoms are the same as those described above for R 2 in formula (A-1).
- the alkylene group is a divalent group derived by removing one more hydrogen atom from an alkyl group, and may be linear, branched, or cyclic. Specific examples of such an alkylene group include , the same as those described above. Although the number of carbon atoms in the alkylene group is not particularly limited, it is preferably 40 or less, more preferably 30 or less, even more preferably 20 or less, still more preferably 10 or less.
- the alkylene group of R 405 may have one or more selected from a sulfide bond, an ether bond and an ester bond at the terminal or in the middle, preferably in the middle.
- the alkylene group include linear alkylene groups such as methylene, ethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, nonamethylene, and decamethylene, methylethylene group, 1-methyltrimethylene group, 2-methyltrimethylene group, 1,1-dimethylethylene group, 1-methyltetramethylene group, 2-methyltetramethylene group, 1,1-dimethyltrimethylene group, 1 , 2-dimethyltrimethylene group, 2,2-dimethyltrimethylene group, branched alkylene groups such as 1-ethyltrimethylene group, 1,2-cyclopropanediyl group, 1,2-cyclobutanediyl group, 1, Cyclic alkylenes such as 3-cyclobutylene group
- the hydroxyalkylene group is obtained by replacing at least one of the hydrogen atoms of the alkylene group described above with a hydroxy group.
- a hydroxymethylene group a 1-hydroxyethylene group, a 2-hydroxyethylene group, 2-dihydroxyethylene group, 1-hydroxytrimethylene group, 2-hydroxytrimethylene group, 3-hydroxytrimethylene group, 1-hydroxytetramethylene group, 2-hydroxytetramethylene group, 3-hydroxytetramethylene group, 4- hydroxytetramethylene group, 1,2-dihydroxytetramethylene group, 1,3-dihydroxytetramethylene group, 1,4-dihydroxytetramethylene group, 2,3-dihydroxytetramethylene group, 2,4-dihydroxytetramethylene group, Examples include, but are not limited to, 4,4-dihydroxytetramethylene group.
- X 401 independently represents any of the groups represented by the following formulas (4-3) to (4-5), and the following formula (4-4) and the carbon atom of the ketone group in formula (4-5) is bonded to the nitrogen atom to which R 405 in formula (4-2) is bonded.
- R 406 to R 410 are each independently a hydrogen atom, an optionally substituted alkyl group, an optionally substituted alkenyl group, or an epoxy represents an organic group having a group or a sulfonyl group (excluding a methoxyphenylsulfonyl group).
- Specific examples of the organic group having an optionally substituted alkyl group, an optionally substituted alkenyl group, an epoxy group, or a sulfonyl group (excluding a methoxyphenylsulfonyl group) and suitable number of carbon atoms are Examples of R 2 in formula (A-1) are the same as those described above.
- X 401 is preferably a group represented by formula (4-5) from the viewpoint of realizing excellent lithography properties with good reproducibility.
- At least one of R 404 and R 406 to R 410 is preferably an alkyl group having a terminal hydrogen atom substituted with a vinyl group.
- a commercially available product may be used for the hydrolyzable organosilane represented by formula (4-1), or it may be synthesized by a known method described in International Publication No. 2011/102470 or the like.
- hydrolyzable organosilane represented by the formula (4-1) include silanes represented by the following formulas (4-1-1) to (4-1-29). , but not limited to.
- [A] Polysiloxane and [A'] Polysiloxane are hydrolyzed condensates of hydrolyzable silanes containing other silane compounds other than those exemplified above, or modified products thereof, as long as they do not impair the effects of the present invention. be able to.
- modified products in which at least part of the silanol groups of a hydrolytic condensate are modified can be used as [A]polysiloxane and [A']polysiloxane.
- a modified product in which a part of the silanol group is alcohol-modified or an acetal-protected modified product can be used.
- the polysiloxane that is the modified product is a reaction product obtained by reacting at least part of the silanol groups of the condensate with the hydroxy groups of the alcohol in the hydrolytic condensate of the hydrolyzable silane described above. Examples include a dehydration reaction product of a compound and an alcohol, and a modified product obtained by protecting at least part of the silanol groups of the condensate with an acetal group.
- Monohydric alcohols can be used as alcohols such as methanol, ethanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, 1-pentanol, 2-pentanol, 3- Pentanol, 1-heptanol, 2-heptanol, tert-amyl alcohol, neopentyl alcohol, 2-methyl-1-propanol, 2-methyl-1-butanol, 3-methyl-1-butanol, 3-methyl-3- pentanol, cyclopentanol, 1-hexanol, 2-hexanol, 3-hexanol, 2,3-dimethyl-2-butanol, 3,3-dimethyl-1-butanol, 3,3-dimethyl-2-butanol, 2 -diethyl-1-butanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, 2-methyl-3-pentano
- 3-methoxybutanol ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether (1-methoxy-2-propanol), propylene glycol monoethyl ether (1-ethoxy -2-propanol), propylene glycol monobutyl ether (1-butoxy-2-propanol) and other alkoxy group-containing alcohols can be used.
- the reaction between the silanol group of the hydrolytic condensate and the hydroxy group of the alcohol is carried out by contacting the hydrolytic condensate with the alcohol at a temperature of 40 to 160° C., for example, 60° C., for 0.1 to 48 hours, for example. By reacting for 24 hours, a modified product with capped silanol groups is obtained.
- the alcohol of the capping agent can be used as a solvent in the composition containing polysiloxane.
- a dehydration reaction product of a hydrolytic condensate of a hydrolyzable silane and an alcohol is obtained by reacting the hydrolytic condensate with an alcohol in the presence of an acid as a catalyst, capping the silanol groups with the alcohol, and dehydrating. It can be produced by removing the produced water out of the reaction system.
- an organic acid having an acid dissociation constant (pka) of -1 to 5, preferably 4 to 5 can be used.
- the acid can be trifluoroacetic acid, maleic acid, benzoic acid, isobutyric acid, acetic acid, etc. Among them, benzoic acid, isobutyric acid, acetic acid, etc. can be exemplified.
- an acid having a boiling point of 70 to 160° C. can be used, and examples thereof include trifluoroacetic acid, isobutyric acid, acetic acid, nitric acid and the like.
- the acid preferably has either an acid dissociation constant (pka) of 4 to 5 or a boiling point of 70 to 160°C. That is, one with weak acidity or one with strong acidity but low boiling point can be used.
- pka acid dissociation constant
- the acid it is possible to use any of the properties of the acid dissociation constant and the boiling point.
- the acetal protection of the silanol group possessed by the hydrolytic condensate can be performed using a vinyl ether, for example, a vinyl ether represented by the following formula (5). It can be introduced into polysiloxane.
- R 1a , R 2a and R 3a each represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 4a represents an alkyl group having 1 to 10 carbon atoms
- R 2a and R 4a may combine with each other to form a ring.
- Examples of the alkyl group can be exemplified above.
- R 1 ', R 2 ', and R 3 ' each represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 4 ' represents an alkyl group having 1 to 10 carbon atoms.
- R 2 ' and R 4 ' may combine with each other to form a ring.
- Adjacent atoms include, for example, oxygen atoms in siloxane bonds, oxygen atoms in silanol groups, and carbon atoms derived from R 1 in Formula (1). Examples of the alkyl group can be exemplified above.
- Examples of the vinyl ether represented by formula (5) include aliphatic vinyl ether compounds such as methyl vinyl ether, ethyl vinyl ether, isopropyl vinyl ether, normal butyl vinyl ether, 2-ethylhexyl vinyl ether, tert-butyl vinyl ether, and cyclohexyl vinyl ether; -dihydrofuran, 4-methyl-2,3-dihydrofuran, and 3,4-dihydro-2H-pyran can be used.
- ethyl vinyl ether propyl vinyl ether, butyl vinyl ether, ethylhexyl vinyl ether, cyclohexyl vinyl ether, 3,4-dihydro-2H-pyran, or 2,3-dihydrofuran can be preferably used.
- Acetal protection of the silanol group is carried out using a hydrolytic condensate, a vinyl ether, and an aprotic solvent such as propylene glycol monomethyl ether acetate, ethyl acetate, dimethylformamide, tetrahydrofuran, 1,4-dioxane as a solvent, pyridium paratoluene, and the like. It can be carried out using a catalyst such as sulfonic acid, trifluoromethanesulfonic acid, p-toluenesulfonic acid, methanesulfonic acid, hydrochloric acid, sulfuric acid and the like.
- a catalyst such as sulfonic acid, trifluoromethanesulfonic acid, p-toluenesulfonic acid, methanesulfonic acid, hydrochloric acid, sulfuric acid and the like.
- the capping of the silanol group with an alcohol and the acetal protection may be performed simultaneously with the hydrolysis and condensation of the hydrolyzable silane, which will be described later.
- the hydrolytic condensate of hydrolyzable silane or its modified product can have a weight average molecular weight of, for example, 500 to 1,000,000.
- the weight average molecular weight is preferably 500,000 or less, more preferably 250,000 or less, and still more preferably 100,000 or less. From the viewpoint of achieving both storage stability and coatability, it is preferably 700 or more, more preferably 1,000 or more.
- a weight average molecular weight is a molecular weight obtained by polystyrene conversion by GPC analysis.
- GPC analysis for example, GPC apparatus (trade name HLC-8220GPC, manufactured by Tosoh Corporation), GPC column (trade name Shodex (registered trademark) KF803L, KF802, KF801, manufactured by Showa Denko Co., Ltd.), the column temperature is 40 ° C., Tetrahydrofuran can be used as an eluent (elution solvent), the flow rate (flow rate) can be set to 1.0 mL/min, and polystyrene (Shodex (registered trademark) manufactured by Showa Denko KK) can be used as a standard sample.
- GPC apparatus trade name HLC-8220GPC, manufactured by Tosoh Corporation
- GPC column trade name Shodex (registered trademark) KF803L, KF802, KF801, manufactured by Showa Denko Co., Ltd.
- Tetrahydrofuran can be used as an eluent (elution solvent)
- the flow rate (flow rate) can be
- a hydrolytic condensate of hydrolyzable silane is obtained by hydrolyzing and condensing the aforementioned silane compound (hydrolyzable silane).
- the aforementioned silane compounds (hydrolyzable silanes) contain an alkoxy group, an aralkyloxy group, an acyloxy group, or a halogen atom directly bonded to a silicon atom, i.e., an alkoxysilyl group, an aralkyloxysilyl group, an acyloxysilyl group, or a halogen atom.
- silyl groups hereinafter referred to as hydrolyzable groups).
- water is generally used in an amount of 0.1 to 100 mol, for example 0.5 to 100 mol, preferably 1 to 10 mol, per 1 mol of hydrolyzable group.
- a hydrolysis catalyst may be used for the purpose of promoting the reaction, or the hydrolysis and condensation may be performed without using a hydrolysis catalyst.
- a hydrolysis catalyst it can be used in an amount of usually 0.0001 to 10 mol, preferably 0.001 to 1 mol, per 1 mol of hydrolyzable group.
- the reaction temperature for hydrolysis and condensation is generally room temperature or higher and the reflux temperature or lower of the organic solvent that can be used for hydrolysis at normal pressure, for example, 20 to 110°C, or for example, 20 to 80°C.
- the hydrolysis may be complete hydrolysis, ie converting all hydrolyzable groups to silanol groups, or it may be partially hydrolyzed, ie leaving unreacted hydrolyzable groups.
- Hydrolysis catalysts that can be used for hydrolysis and condensation include metal chelate compounds, organic acids, inorganic acids, organic bases, and inorganic bases.
- Metal chelate compounds as hydrolysis catalysts include, for example, triethoxy mono(acetylacetonato)titanium, tri-n-propoxy mono(acetylacetonato)titanium, tri-i-propoxy mono(acetylacetonato)titanium, tri -n-butoxy mono(acetylacetonato)titanium, tri-sec-butoxy mono(acetylacetonato)titanium, tri-t-butoxy mono(acetylacetonato)titanium, diethoxy bis(acetylacetonato)titanium , di-n-propoxy bis (acetylacetonato) titanium, di-i-propoxy bis (acetylacetonato) titanium, di-n-butoxy bis (acetylacetonate) titanium, di-sec-butoxy bis (acetylacetonato)titanium, di-t-butoxy bis(acet
- Organic acids as hydrolysis catalysts are, for example, acetic acid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, oxalic acid, maleic acid, methylmalonic acid, adipic acid, sebacine.
- Acid gallic acid, butyric acid, mellitic acid, arachidonic acid, 2-ethylhexanoic acid, oleic acid, stearic acid, linoleic acid, linoleic acid, salicylic acid, benzoic acid, p-aminobenzoic acid, p-toluenesulfonic acid, benzenesulfone Acids include, but are not limited to, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, trifluoroacetic acid, formic acid, malonic acid, sulfonic acid, phthalic acid, fumaric acid, citric acid, tartaric acid, and the like.
- inorganic acids as hydrolysis catalysts include, but are not limited to, hydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, and phosphoric acid.
- Organic bases as hydrolysis catalysts include, for example, pyridine, pyrrole, piperazine, pyrrolidine, piperidine, picoline, trimethylamine, triethylamine, monoethanolamine, diethanolamine, dimethylmonoethanolamine, monomethyldiethanolamine, triethanolamine, diazabicyclooctane, dia Zabicyclononane, diazabicycloundecene, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylphenylammonium hydroxide, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide etc., but not limited to these.
- inorganic bases as hydrolysis catalysts include, but are not limited to, ammonia, sodium hydroxide, potassium hydroxide, barium hydroxide, and calcium hydroxide.
- metal chelate compounds organic acids, and inorganic acids are preferred, and these may be used singly or in combination of two or more.
- nitric acid can be preferably used as a hydrolysis catalyst in the present invention.
- nitric acid By using nitric acid, the storage stability of the reaction solution after hydrolysis and condensation can be improved, and in particular, the change in molecular weight of the hydrolytic condensate or its modified product can be suppressed. It has been found that the stability of hydrolytic condensates or modified products thereof in liquid depends on the pH of the solution. As a result of intensive studies, it was found that the pH of the solution becomes a stable region by using an appropriate amount of nitric acid.
- nitric acid can also be used when obtaining a modified hydrolytic condensate, for example, when capping a silanol group with an alcohol. It is also preferable from the viewpoint that it can contribute to both reactions of alcohol capping of substances.
- An organic solvent may be used as a solvent for the hydrolysis and condensation, and specific examples include n-pentane, i-pentane, n-hexane, i-hexane, n-heptane, i-heptane, 2, Aliphatic hydrocarbon solvents such as 2,4-trimethylpentane, n-octane, i-octane, cyclohexane, methylcyclohexane; benzene, toluene, xylene, ethylbenzene, trimethylbenzene, methylethylbenzene, n-propylbenzene, i-propyl Aromatic hydrocarbon solvents such as benzene, diethylbenzene, i-butylbenzene, triethylbenzene, di-i-propylbenzene, n-amylnaphthalene; methanol, ethanol, n-
- reaction solution is diluted or concentrated, neutralized, and treated with an ion-exchange resin to hydrolyze the acids, bases, etc. used in the hydrolysis and condensation.
- Catalyst can be removed.
- by-products such as alcohol and water, and the used hydrolysis catalyst can be removed from the reaction solution by vacuum distillation or the like.
- the hydrolytic condensate or modified product thereof (hereinafter also referred to as polysiloxane) thus obtained is obtained in the form of a polysiloxane varnish dissolved in an organic solvent, which is used as it is for the silicon-containing resist underlayer film. It can be used to prepare a forming composition. That is, the reaction solution can be used as it is (or diluted) for the preparation of the composition for forming a silicon-containing resist underlayer film. It may remain in the reaction solution as long as it does not impair the effects of the invention. For example, about 100 ppm to 5,000 ppm of nitric acid used as a hydrolysis catalyst or alcohol capping of silanol groups may remain in the polymer varnish solution.
- the obtained polysiloxane varnish may be subjected to solvent replacement or may be diluted with a solvent as appropriate.
- the resulting polysiloxane varnish may have a film-forming component concentration of 100% by distilling off the organic solvent if the storage stability is not poor.
- the film-forming component refers to a component excluding the solvent component from all components of the composition.
- the organic solvent used for solvent replacement, dilution, etc. of the polysiloxane varnish may be the same as or different from the organic solvent used for the hydrolysis and condensation reaction of the hydrolyzable silane.
- the diluting solvent is not particularly limited, and one or two or more can be arbitrarily selected and used.
- the solvent as the [C] component is a solvent that can dissolve and mix the [A] component and, if necessary, other components contained in the silicon-containing resist underlayer film-forming composition. It can be used without any particular restrictions.
- the solvent as the [C] component dissolves the [A′] component, the [B] component, and other components contained in the silicon-containing resist underlayer film-forming composition as necessary. Any solvent that can be miscible can be used without any particular limitation.
- the solvent is preferably an alcohol solvent, more preferably an alkylene glycol monoalkyl ether which is an alcohol solvent, and still more preferably a propylene glycol monoalkyl ether. Since these solvents are also capping agents for the silanol groups of hydrolysis condensates, silicon A containing composition for forming a resist underlayer film can be prepared.
- Alkylene glycol monoalkyl ethers include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether (1-methoxy-2-propanol), propylene glycol monoethyl ether ( 1-ethoxy-2-propanol), methyl isobutyl carbinol, propylene glycol monobutyl ether and the like.
- [C] solvents include methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol propylene glycol monomethyl ether acetate (1-methoxy-2-propanol monoacetate), propylene glycol monoethyl ether acetate, and propylene glycol monopropyl.
- ether acetate propylene glycol monobutyl ether acetate, toluene, xylene, methyl ethyl ketone, cyclopentanone, cyclohexanone, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, ethyl ethoxyacetate, ethyl hydroxyacetate, 2-hydroxy -methyl 3-methylbutanoate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, ethyl 3-ethoxypropionate, methyl 3-ethoxypropionate, methyl pyruvate, ethyl pyruvate, ethylene glycol monomethyl ether acetate, ethylene Glycol monoethyl ether acetate, ethylene glycol monopropyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol dimethyl ether, diethylene glycol diethyl
- the composition for forming a silicon-containing resist underlayer film of the present invention may contain water as a solvent.
- water When water is contained as a solvent, its content is, for example, 30% by mass or less, preferably 20% by mass or less, and even more preferably 15% by mass or less, relative to the total mass of the solvent contained in the composition. be able to.
- composition for forming a silicon-containing resist underlayer film may be a composition containing no curing catalyst, but preferably contains a curing catalyst (component [D]).
- Ammonium salts, phosphines, phosphonium salts, sulfonium salts, etc. can be used as curing catalysts.
- the following salts described as examples of curing catalysts may be added in the form of salts, or those that form salts in the composition (when added, they are added as separate compounds and form salts in the system. thing).
- formula (D-1) (In the formula, m a represents an integer of 2 to 11, n a represents an integer of 2 to 3, R 21 represents an alkyl group, an aryl group, or an aralkyl group, and Y - represents an anion.)
- Formula (D-2) (Wherein, R 22 , R 23 , R 24 and R 25 each independently represent an alkyl group, an aryl group or an aralkyl group; Y — represents an anion; and R 22 , R 23 , R 24 and R 25 are each bound to a nitrogen atom.) a quaternary ammonium salt having a structure represented by
- Formula (D-3) (Wherein, R 26 and R 27 independently represent an alkyl group, an aryl group, or an aralkyl group, and Y — represents an anion), a quaternary ammonium salt having a structure represented by
- Formula (D-5) (Wherein, R 29 and R 30 independently represent an alkyl group, an aryl group, or an aralkyl group, and Y — represents an anion), a quaternary ammonium salt having a structure represented by
- the formula (D-7) (Wherein, R 31 , R 32 , R 33 and R 34 each independently represent an alkyl group, an aryl group or an aralkyl group, Y- represents an anion, and R 31 , R 32 , Each of R 33 and R 34 is bound to a phosphorus atom.).
- the formula (D-8) (Wherein, R 35 , R 36 and R 37 independently represent an alkyl group, an aryl group or an aralkyl group; Y — represents an anion; and R 35 , R 36 and R 37 are each bonded to a sulfur atom.) can be mentioned.
- the compound of formula (D-1) is a quaternary ammonium salt derived from an amine, where m a represents an integer of 2-11 and n a represents an integer of 2-3.
- R 21 of this quaternary ammonium salt represents, for example, an alkyl group having 1 to 18 carbon atoms, preferably 2 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms, or an aralkyl group having 7 to 18 carbon atoms. , for example, linear alkyl groups such as ethyl group, propyl group and butyl group, benzyl group, cyclohexyl group, cyclohexylmethyl group, dicyclopentadienyl group and the like.
- the anion (Y ⁇ ) includes halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ), alcoholate (—O ⁇ ) and other acid groups.
- halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ), alcoholate (—O ⁇ ) and other acid groups.
- the compound of formula (D-2) is a quaternary ammonium salt represented by R 22 R 23 R 24 R 25 N + Y - .
- R 22 , R 23 , R 24 and R 25 of this quaternary ammonium salt are, for example, an alkyl group having 1 to 18 carbon atoms such as ethyl, propyl, butyl, cyclohexyl, cyclohexylmethyl, phenyl or an aryl group having 6 to 18 carbon atoms such as a group, or an aralkyl group having 7 to 18 carbon atoms such as a benzyl group.
- Anions (Y ⁇ ) include halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ). , alcoholate (—O ⁇ ) and other acid groups.
- the quaternary ammonium salts are commercially available, for example tetramethylammonium acetate, tetrabutylammonium acetate, triethylbenzylammonium chloride, triethylbenzylammonium bromide, trioctylmethylammonium chloride, tributylbenzyl chloride. Ammonium, trimethylbenzylammonium chloride and the like are exemplified.
- the compound of formula (D-3) is a quaternary ammonium salt derived from 1-substituted imidazole, R 26 and R 27 have, for example, 1 to 18 carbon atoms, and R 26 and R 27 The total number of carbon atoms in is preferably 7 or more.
- R 26 can be exemplified by alkyl groups such as methyl group, ethyl group and propyl group, aryl groups such as phenyl group, and aralkyl groups such as benzyl group
- R 27 can be exemplified by aralkyl groups such as benzyl group, octyl group
- An alkyl group such as an octadecyl group can be exemplified.
- Anions (Y ⁇ ) include halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ). , alcoholate (—O ⁇ ) and other acid groups.
- this compound can be obtained as a commercial product, for example, imidazole compounds such as 1-methylimidazole and 1-benzylimidazole, aralkyl halides such as benzyl bromide, methyl bromide and benzene bromide, and halogenated It can be produced by reacting alkyl and halogenated aryl.
- the compound of formula (D-4) is a quaternary ammonium salt derived from pyridine
- R 28 is, for example, an alkyl group having 1 to 18 carbon atoms, preferably 4 to 18 carbon atoms, It is an aryl group having 6 to 18 carbon atoms or an aralkyl group having 7 to 18 carbon atoms such as butyl group, octyl group, benzyl group and lauryl group.
- Anions (Y ⁇ ) include halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ). , alcoholate (—O ⁇ ) and other acid groups.
- This compound can be obtained as a commercial product, and is produced, for example, by reacting pyridine with an alkyl halide such as lauryl chloride, benzyl chloride, benzyl bromide, methyl bromide, octyl bromide, or an aryl halide. can do. Examples of this compound include N-laurylpyridinium chloride and N-benzylpyridinium bromide.
- the compound of formula (D-5) is a quaternary ammonium salt derived from a substituted pyridine typified by picoline and the like, and R 29 has, for example, 1 to 18 carbon atoms, preferably 4 to 18 carbon atoms. or an aryl group having 6 to 18 carbon atoms, or an aralkyl group having 7 to 18 carbon atoms, such as methyl, octyl, lauryl and benzyl.
- R 30 is, for example, an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, or an aralkyl group having 7 to 18 carbon atoms, such as represented by formula (D-5) If the compound is a quaternary ammonium derived from picoline, R30 is a methyl group.
- Anions (Y ⁇ ) include halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ). , alcoholate (—O ⁇ ) and other acid groups.
- This compound is also commercially available, and for example, by reacting a substituted pyridine such as picoline with an alkyl halide such as methyl bromide, octyl bromide, lauryl chloride, benzyl chloride, benzyl bromide, or an aryl halide.
- an alkyl halide such as methyl bromide, octyl bromide, lauryl chloride, benzyl chloride, benzyl bromide, or an aryl halide.
- alkyl halide such as methyl bromide, octyl bromide, lauryl chloride, benzyl chloride, benzyl bromide, or an aryl halide.
- the compound of formula (D-6) is a tertiary ammonium salt derived from an amine, where m a represents an integer of 2-11 and n a represents 2 or 3.
- the anion (Y ⁇ ) includes halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ), alcoholate (—O ⁇ ) and other acid groups.
- This compound can be produced by reacting an amine with a weak acid such as a carboxylic acid or phenol.
- Carboxylic acids include formic acid and acetic acid.
- the anion (Y ⁇ ) is (HCOO ⁇ ), and when acetic acid is used, the anion (Y ⁇ ) is (CH 3 COO - ). Also, when phenol is used, the anion (Y ⁇ ) is (C 6 H 5 O ⁇ ).
- the compound of formula (D-7) is a quaternary phosphonium salt having a structure of R 31 R 32 R 33 R 34 P + Y- .
- R 31 , R 32 , R 33 and R 34 are, for example, alkyl groups having 1 to 18 carbon atoms such as ethyl, propyl, butyl and cyclohexylmethyl, and alkyl groups having 6 to 18 carbon atoms such as phenyl.
- an aryl group or an aralkyl group having 7 to 18 carbon atoms such as a benzyl group, preferably three of the four substituents R 31 to R 34 are an unsubstituted phenyl group or a substituted phenyl group; , for example, a phenyl group or a tolyl group, and the remaining one is an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, or an aralkyl group having 7 to 18 carbon atoms. is.
- Anions (Y ⁇ ) include halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ), alcoholate (—O ⁇ ) and other acid groups.
- This compound can be obtained as a commercial product, and examples thereof include tetraalkylphosphonium halides such as tetra-n-butylphosphonium halide and tetra-n-propylphosphonium halide, and trialkylbenzyl halides such as triethylbenzylphosphonium halide.
- Phosphonium triphenylmethylphosphonium halide, triphenylmonoalkylphosphonium halide such as triphenylethylphosphonium halide, triphenylbenzylphosphonium halide, tetraphenylphosphonium halide, tritolylmonoarylphosphonium halide, or tritolylmonohalide
- Alkylphosphonium (wherein the halogen atom is a chlorine atom or a bromine atom) can be mentioned.
- triphenylmonoalkylphosphonium halides such as triphenylmethylphosphonium halide and triphenylethylphosphonium halide
- triphenylmonoarylphosphonium halides such as triphenylbenzylphosphonium halide
- halogens such as tritolylmonophenylphosphonium halide
- Tritolylmonoalkylphosphonium halides halogen atoms are chlorine atoms or bromine atoms
- tritolylmonoarylphosphonium halides and tritolylmonomethylphosphonium halides are preferable.
- Phosphines include primary phosphines such as methylphosphine, ethylphosphine, propylphosphine, isopropylphosphine, isobutylphosphine and phenylphosphine, and secondary phosphines such as dimethylphosphine, diethylphosphine, diisopropylphosphine, diisoamylphosphine and diphenylphosphine. , trimethylphosphine, triethylphosphine, triphenylphosphine, methyldiphenylphosphine, dimethylphenylphosphine and the like.
- the compound of formula (D-8) is a tertiary sulfonium salt having a structure of R 35 R 36 R 37 S + Y - .
- R 35 , R 36 and R 37 are, for example, an alkyl group having 1 to 18 carbon atoms such as ethyl, propyl, butyl and cyclohexylmethyl; an aryl group having 6 to 18 carbon atoms such as phenyl; or an aralkyl group having 7 to 18 carbon atoms such as a benzyl group, preferably two of the three substituents R 35 to R 37 are an unsubstituted phenyl group or a substituted phenyl group, such as phenyl and tolyl groups, and the remaining one is an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, or an aralkyl group having 7 to 18 carbon atoms.
- Anions (Y ⁇ ) include halide ions such as chloride ion (Cl ⁇ ), bromide ion (Br ⁇ ), iodine ion (I ⁇ ), carboxylate (—COO ⁇ ), sulfonate (—SO 3 ⁇ ), alcoholate (—O ⁇ ), maleate anion, nitrate anion and the like.
- This compound is commercially available and includes trialkylsulfonium halides such as tri-n-butylsulfonium halide and tri-n-propylsulfonium halide, and dialkylbenzylsulfonium halides such as diethylbenzylsulfonium halide.
- diphenylmethylsulfonium halide, diphenylethylsulfonium halide and other diphenyl monoalkylsulfonium halides triphenylsulfonium halides (halogen atoms are chlorine atoms or bromine atoms), tri-n-butylsulfonium carboxylate, tri-n- trialkylsulfonium carboxylates such as propylsulfonium carboxylate; dialkylbenzylsulfonium carboxylates such as diethylbenzylsulfonium carboxylate; diphenylmethylsulfonium carboxylate; are mentioned.
- triphenylsulfonium halides and triphenylsulfonium carboxylates can be preferably used.
- Nitrogen-containing silane compounds include imidazole ring-containing silane compounds such as N-(3-triethoxysilipropyl)-4,5-dihydroimidazole.
- the content of [D] curing catalyst in the composition for forming a silicon-containing resist underlayer film of the first embodiment is , preferably 0.1 to 30 parts by mass, more preferably 0.5 to 25 parts by mass, and even more preferably 1 to 20 parts by mass.
- the content of the [D] curing catalyst in the composition for forming a silicon-containing resist underlayer film of the second embodiment is , preferably 0.1 to 30 parts by mass, more preferably 0.5 to 25 parts by mass, and even more preferably 1 to 20 parts by mass.
- the composition for forming a silicon-containing resist underlayer film preferably contains [E] nitric acid.
- [E] Nitric acid may be added during the preparation of the composition for forming a silicon-containing resist underlayer film. What remains in the varnish can also be treated as [E] nitric acid.
- the amount of nitric acid is, for example, 0.0001% by mass to 1% by mass, or 0.001% by mass to 0.001% by mass, based on the total mass of the silicon-containing resist underlayer film-forming composition. It can be 1 wt%, or 0.005 wt% to 0.05 wt%.
- additives can be added to the composition for forming a silicon-containing resist underlayer film depending on the application of the composition.
- additives include cross-linking agents, cross-linking catalysts, stabilizers (organic acids, water, alcohols, etc.), organic polymers, acid generators, surfactants (nonionic surfactants, anionic surfactants, cationic surfactants, silicon surfactants, fluorine surfactants, UV curable surfactants, etc.), pH adjusters, metal oxides, rheology adjusters, adhesion aids, etc., resist underlayer films, anti-reflection
- Known additives blended in materials (compositions) for forming various films that can be used in the manufacture of semiconductor devices, such as films and films for pattern reversal can be mentioned. Although various additives are exemplified below, they are not limited to these.
- a stabilizer may be added for the purpose of stabilizing the hydrolytic condensate of the hydrolyzable silane, and specific examples thereof include organic acids, water, alcohols, or combinations thereof.
- organic acids include oxalic acid, malonic acid, methylmalonic acid, succinic acid, maleic acid, malic acid, tartaric acid, phthalic acid, citric acid, glutaric acid, lactic acid and salicylic acid. Among them, oxalic acid and maleic acid are preferred.
- the organic acid is added, the amount of addition is 0.1 to 5.0% by mass based on the mass of the hydrolyzed condensate of the hydrolyzable silane.
- These organic acids can also act as pH adjusters.
- the amount added is 1 to 20 parts by mass with respect to 100 parts by mass of the composition for forming a silicon-containing resist underlayer film.
- the amount added can be 1 to 20 parts by mass with respect to 100 parts by mass of the composition for forming a silicon-containing resist underlayer film.
- Organic Polymer By adding the organic polymer to the composition for forming a silicon-containing resist underlayer film, the dry etching rate (decrease in film thickness per unit time) of the film (resist underlayer film) formed from the composition, and the attenuation A coefficient, a refractive index, etc. can be adjusted.
- the organic polymer is not particularly limited, and is appropriately selected from various organic polymers (condensation polymer and addition polymer) according to the purpose of addition.
- addition polymerization polymers and condensation polymerization polymers such as polyester, polystyrene, polyimide, acrylic polymer, methacrylic polymer, polyvinyl ether, phenol novolac, naphthol novolac, polyether, polyamide, and polycarbonate.
- organic polymers containing aromatic rings such as benzene, naphthalene, anthracene, triazine, quinoline and quinoxaline rings and heteroaromatic rings that function as light absorbing sites are also used when such functions are required. can be preferably used.
- organic polymers include addition polymerizable monomers such as benzyl acrylate, benzyl methacrylate, phenyl acrylate, naphthyl acrylate, anthryl methacrylate, anthryl methyl methacrylate, styrene, hydroxystyrene, benzyl vinyl ether and N-phenylmaleimide. as its structural units, and condensation polymers such as phenol novolacs and naphthol novolacs, but are not limited thereto.
- the polymer When an addition polymer is used as the organic polymer, the polymer may be either a homopolymer or a copolymer.
- Addition-polymerizable monomers are used in the production of addition-polymerized polymers, and specific examples of such addition-polymerizable monomers include acrylic acid, methacrylic acid, acrylic acid ester compounds, methacrylic acid ester compounds, acrylamide compounds, methacrylic Examples include, but are not limited to, amide compounds, vinyl compounds, styrene compounds, maleimide compounds, maleic anhydride, acrylonitrile, and the like.
- acrylic acid ester compounds include methyl acrylate, ethyl acrylate, normal hexyl acrylate, i-propyl acrylate, cyclohexyl acrylate, benzyl acrylate, phenyl acrylate, anthryl methyl acrylate, 2-hydroxyethyl acrylate, 3-chloro-2 - hydroxypropyl acrylate, 2-hydroxypropyl acrylate, 2,2,2-trifluoroethyl acrylate, 2,2,2-trichloroethyl acrylate, 2-bromoethyl acrylate, 4-hydroxybutyl acrylate, 2-methoxyethyl acrylate, tetrahydrofurfuryl acrylate, 2-methyl-2-adamantyl acrylate, 5-acryloyloxy-6-hydroxynorbornene-2-carboxylic-6-lactone, 3-acryloxypropyltriethoxysilane, glycidyl acrylate, etc
- methacrylate compounds include methyl methacrylate, ethyl methacrylate, normal hexyl methacrylate, i-propyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, phenyl methacrylate, anthrylmethyl methacrylate, 2-hydroxyethyl methacrylate, and 2-hydroxypropyl methacrylate.
- acrylamide compounds include acrylamide, N-methylacrylamide, N-ethylacrylamide, N-benzylacrylamide, N-phenylacrylamide, N,N-dimethylacrylamide, N-anthrylacrylamide and the like. Not limited.
- methacrylamide compounds include methacrylamide, N-methylmethacrylamide, N-ethylmethacrylamide, N-benzylmethacrylamide, N-phenylmethacrylamide, N,N-dimethylmethacrylamide, and N-anthrylmethacrylamide. etc., but not limited to these.
- vinyl compounds include vinyl alcohol, 2-hydroxyethyl vinyl ether, methyl vinyl ether, ethyl vinyl ether, benzyl vinyl ether, vinyl acetate, vinyltrimethoxysilane, 2-chloroethyl vinyl ether, 2-methoxyethyl vinyl ether, vinyl naphthalene, vinyl Examples include, but are not limited to, anthracene.
- styrene compounds include, but are not limited to, styrene, hydroxystyrene, chlorostyrene, bromostyrene, methoxystyrene, cyanostyrene, and acetylstyrene.
- Maleimide compounds include, but are not limited to, maleimide, N-methylmaleimide, N-phenylmaleimide, N-cyclohexylmaleimide, N-benzylmaleimide, N-hydroxyethylmaleimide, and the like.
- a polycondensation polymer when used as the polymer, such a polymer includes, for example, polycondensation of a glycol compound and a dicarboxylic acid compound.
- Glycol compounds include diethylene glycol, hexamethylene glycol, butylene glycol and the like.
- Dicarboxylic acid compounds include succinic acid, adipic acid, terephthalic acid, maleic anhydride and the like.
- Further examples include, but are not limited to, polyesters such as polypyromellitimide, poly(p-phenylene terephthalamide), polybutylene terephthalate, and polyethylene terephthalate, polyamides, and polyimides.
- the organic polymer contains a hydroxy group, this hydroxy group can undergo a cross-linking reaction with a hydrolyzed condensate or the like.
- the weight-average molecular weight of the organic polymer can generally range from 1,000 to 1,000,000.
- the weight average molecular weight is, for example, 3,000 to 300,000, or 5,000 to 5,000. It can be 300,000, or 10,000-200,000, and so on.
- Such organic polymers may be used singly or in combination of two or more.
- A′] can be in the range of 1 to 200% by mass with respect to the mass of the polysiloxane, and from the viewpoint of suppressing precipitation in the composition, for example, 100% by mass or less, preferably 50% by mass or less, More preferably, it can be 30% by mass or less, and from the viewpoint of sufficiently obtaining the effect, for example, it can be 5% by mass or more, preferably 10% by mass or more, and more preferably 30% by mass or more.
- acid generators include thermal acid generators and photoacid generators, and photoacid generators can be preferably used.
- Photoacid generators include, but are not limited to, onium salt compounds, sulfonimide compounds, disulfonyldiazomethane compounds, and the like.
- the photoacid generator may also function as a curing catalyst, depending on the type of the onium salt compound, such as carboxylates such as nitrates and maleates, and hydrochlorides, which will be described later.
- thermal acid generators include tetramethylammonium nitrate and the like, but are not limited thereto.
- onium salt compounds include diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium nonafluoro-normal butanesulfonate, diphenyliodonium perfluoro-normal octane sulfonate, diphenyliodonium camphorsulfonate, bis(4-t-butylphenyl ) iodonium salt compounds such as iodonium camphorsulfonate, bis(4-t-butylphenyl)iodonium trifluoromethanesulfonate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium nonafluoron-butanesulfonate, triphenylsulfonium camphorsulfonate, triphenylsulfonium Examples include, but are not limited to,
- sulfonimide compounds include N-(trifluoromethanesulfonyloxy)succinimide, N-(nonafluoro-normalbutanesulfonyloxy)succinimide, N-(camphorsulfonyloxy)succinimide, and N-(trifluoromethanesulfonyloxy)naphthalimide. etc., but not limited to these.
- disulfonyldiazomethane compounds include bis(trifluoromethylsulfonyl)diazomethane, bis(cyclohexylsulfonyl)diazomethane, bis(phenylsulfonyl)diazomethane, bis(p-toluenesulfonyl)diazomethane, and bis(2,4-dimethylbenzene).
- sulfonyl)diazomethane methylsulfonyl-p-toluenesulfonyldiazomethane, and the like, but are not limited thereto.
- the content thereof is determined as appropriate in consideration of the type of the acid generator and the like, and cannot be unconditionally defined.
- It is in the range of 0.01 to 5% by mass relative to the mass of the polysiloxane, preferably 3% by mass or less, more preferably 3% by mass or less, more preferably from the viewpoint of suppressing precipitation of the acid generator in the composition. is 1% by mass or less, preferably 0.1% by mass or more, more preferably 0.5% by mass or more, from the viewpoint of sufficiently obtaining the effect.
- the acid generators may be used singly or in combination of two or more, and a photoacid generator and a thermal acid generator may be used in combination.
- Surfactants are effective in suppressing the occurrence of pinholes, striations, etc. when the silicon-containing resist underlayer film-forming composition is applied to a substrate.
- Examples of surfactants include nonionic surfactants, anionic surfactants, cationic surfactants, silicon surfactants, fluorochemical surfactants, and UV curable surfactants.
- polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, polyoxyethylene nonylphenol
- Polyoxyethylene alkylaryl ethers such as ethers, polyoxyethylene/polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate sorbitan fatty acid esters such as polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate
- Nonionic surfactants such as sorbitan fatty acid esters, trade name Ftop (registered trademark)
- composition for forming a silicon-containing resist underlayer film contains a surfactant
- its content is usually 0.0001 to 5% by mass relative to the mass of [A]polysiloxane or [A']polysiloxane. Yes, preferably 0.001 to 4% by mass, more preferably 0.01 to 3% by mass.
- the rheology modifier mainly improves the fluidity of the composition for forming a silicon-containing resist underlayer film, and particularly in the baking process, improves the uniformity of the film thickness of the formed film and improves the fillability of the composition inside the holes.
- phthalic acid derivatives such as dimethyl phthalate, diethyl phthalate, di-i-butyl phthalate, dihexyl phthalate, butyl i-decyl phthalate, di-n-butyl adipate, di-i-butyl adipate, di-i-octyl adipate, Adipic acid derivatives such as octyldecyl adipate, maleic acid derivatives such as di-n-butyl maleate, diethyl maleate and dinonyl maleate, oleic acid derivatives such as methyl oleate, butyl oleate and tetrahydrofurfuryl oleate, normal butyl stearate and glyceryl stearate Examples include stearic acid derivatives such as rate. When these rheology modifiers are used, the amount added is usually less than 30% by mass based on the total
- the adhesion aid mainly improves the adhesion between the substrate or the resist and the film (resist underlayer film) formed from the composition for forming a silicon-containing resist underlayer film, and particularly suppresses/prevents peeling of the resist during development. added for a purpose.
- chlorosilanes such as trimethylchlorosilane, dimethylvinylchlorosilane, methyldiphenylchlorosilane, and chloromethyldimethylchlorosilane
- alkoxysilanes such as trimethylmethoxysilane, dimethyldiethoxysilane, methyldimethoxysilane, and dimethylvinylethoxysilane
- Disilazane, N,N'-bis(trimethylsilyl)urea dimethyltrimethylsilylamine, silazanes such as trimethylsilylimidazole, ⁇ -chloropropyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane
- Heterocyclic compounds such as other silanes such as benzotriazole, benzimidazole, indazole, imidazole, 2-mercaptobenzimidazole, 2-
- pH adjuster examples include acids having one or more carboxylic acid groups, such as the organic acids exemplified above as stabilizers.
- the amount added is 0.01 to 20 parts by weight, or 0.01 to 10 parts by weight, with respect to 100 parts by weight of [A] polysiloxane or [A'] polysiloxane. , or 0.01 to 5 parts by mass.
- the concentration of film-forming components in the composition for forming a silicon-containing resist underlayer film is, for example, 0.1 to 50% by mass, 0.1 to 30% by mass, or 0.1 to 25% by mass with respect to the total mass of the composition. %, 0.5 to 20.0 mass %.
- the content of [A]polysiloxane or [A']polysiloxane in the film-forming component is usually 20% by mass to 100% by mass, but from the viewpoint of obtaining the effects of the present invention with good reproducibility, etc., the lower limit is preferably 50% by mass, more preferably 60% by mass, even more preferably 70% by mass, and still more preferably 80% by mass, and its upper limit is preferably 99% by mass. can be used as an additive.
- the silicon-containing resist underlayer film-forming composition preferably has a pH of 2-5, more preferably a pH of 3-4.
- the composition for forming a silicon-containing resist underlayer film of the first embodiment is obtained by mixing [A] polysiloxane, [C] solvent, and, if desired, other components, if any. can be manufactured by At this time, a solution containing [A] polysiloxane may be prepared in advance, and this solution may be mixed with [C] solvent and other components.
- the mixing order is not particularly limited. For example, [A] a solution containing polysiloxane and [C] a solvent may be added and mixed, and other components may be added to the mixture, and the solution containing [A] polysiloxane and [C] The solvent and other ingredients may be mixed together.
- the [C] solvent may be additionally added at the end, or some components that are relatively soluble in the [C] solvent may be left out of the mixture and added at the end.
- a solution in which [A] polysiloxane is well dissolved is prepared in advance, and the composition is prepared using this. preferably prepared.
- [A] polysiloxane may aggregate or precipitate when these are mixed, depending on the type and amount of [C] solvent mixed together, the amount and properties of other ingredients, etc. do.
- composition when preparing a composition using a solution in which [A] polysiloxane is dissolved, [A] polysiloxane is added so that the desired amount of [A] polysiloxane in the finally obtained composition is Also note that the concentration of the solution and the amount to be used need to be determined. In the preparation of the composition, the composition may be appropriately heated as long as the components are not decomposed or altered.
- the composition for forming a silicon-containing resist underlayer film of the second embodiment comprises [A′] polysiloxane, [B] hydrolyzable silane (A) having a specific group, [C] solvent, and optionally other
- the component can be produced by mixing with the other component.
- a solution containing [A'] polysiloxane may be prepared in advance, and this solution may be mixed with [B] a hydrolyzable silane (A) having a specific group, [C] a solvent and other components. good.
- the mixing order is not particularly limited.
- [A'] a solution containing polysiloxane, [B] a hydrolyzable silane (A) having a specific group, and [C] a solvent are added and mixed, and other components may be added to the mixture.
- [A'] a solution containing polysiloxane, [B] a hydrolyzable silane (A) having a specific group, [C] a solvent, and other components may be mixed at the same time.
- the [C] solvent may be additionally added at the end, or some components that are relatively soluble in the [C] solvent may be left out of the mixture and added at the end.
- a solution in which [A'] polysiloxane is well dissolved is prepared in advance, and the composition is prepared using this. is preferably prepared.
- [A'] polysiloxane may be Note that it may clump or settle when mixed.
- concentration of the polysiloxane solution and the amount used must be determined. In the preparation of the composition, the composition may be appropriately heated as long as the components are not decomposed or altered.
- the composition for forming a silicon-containing resist underlayer film may be filtered using a submicrometer-order filter or the like in the middle of manufacturing the composition or after mixing all the components.
- the material of the filter used at this time is not limited, but for example, a nylon filter, a fluororesin filter, or the like can be used.
- composition for forming a silicon-containing resist underlayer film of the present invention can be suitably used as a composition for forming a resist underlayer film used in a lithography process.
- One form of the silicon-containing resist underlayer film of the present invention is a cured product of the composition for forming a silicon-containing resist underlayer film of the present invention.
- a semiconductor processing substrate of the present invention has a semiconductor substrate and a silicon-containing resist underlayer film.
- the silicon-containing resist underlayer film is the resist underlayer film of the present invention or a cured resist underlayer film of the composition for forming a silicon-containing resist underlayer film of the present invention.
- the method for manufacturing a semiconductor device of the present invention comprises: forming an organic underlayer film on a substrate; forming a resist underlayer film on the organic underlayer film using the silicon-containing composition for forming a resist underlayer film of the present invention; forming a resist film on the resist underlayer film; including.
- the pattern forming method of the present invention comprises forming an organic underlayer film on a semiconductor substrate; a step of applying the silicon-containing composition for forming a resist underlayer film of the present invention onto an organic underlayer film and baking the composition to form a resist underlayer film; A step of applying a composition for forming a resist film onto the resist underlayer film to form a resist film; a step of exposing and developing the resist film to obtain a resist pattern; Etching the resist underlayer film using the resist pattern as a mask; using the patterned resist underlayer film as a mask to etch the organic underlayer film; including.
- Substrates used in the manufacture of precision integrated circuit devices e.g., semiconductor substrates such as silicon wafers coated with silicon oxide films, silicon nitride films or silicon oxynitride films, silicon nitride substrates, quartz substrates, glass substrates (non-alkali glass , low alkali glass, and crystallized glass), glass substrates with ITO (indium tin oxide) or IZO (indium zinc oxide) films, plastic (polyimide, PET, etc.) substrates, low dielectric constant materials (low-k material) coated substrates, flexible substrates, etc.], the silicon-containing resist underlayer film-forming composition of the present invention is applied by an appropriate coating method such as a spinner or coater, and then applied on a hot plate or the like.
- an appropriate coating method such as a spinner or coater
- the composition is cured to form a resist underlayer film.
- the resist underlayer film refers to the silicon-containing resist underlayer film of the present invention or a film formed from the silicon-containing resist underlayer film-forming composition of the present invention.
- the firing conditions are appropriately selected from a firing temperature of 40° C. to 400° C. or 80° C. to 250° C. and a firing time of 0.3 minutes to 60 minutes.
- the firing temperature is 150° C. to 250° C. and the firing time is 0.5 minutes to 2 minutes.
- the film thickness of the resist underlayer film formed here is, for example, 10 nm to 1,000 nm, 20 nm to 500 nm, 50 nm to 300 nm, 100 nm to 200 nm, or 10 to 150 nm.
- a silicon-containing resist underlayer film-forming composition filtered through a nylon filter can be used as the silicon-containing resist underlayer film-forming composition used for forming the resist underlayer film.
- the silicone-containing resist underlayer film-forming composition filtered through a nylon filter means that the silicone-containing resist underlayer film-forming composition was filtered through a nylon filter in the middle of manufacturing the silicon-containing resist underlayer film-forming composition, or after all the components were mixed. Refers to composition.
- the organic underlayer film is formed on the substrate, and then the resist underlayer film is formed thereon.
- the organic underlayer film used here is not particularly limited, and can be arbitrarily selected from those conventionally used in lithography processes.
- the pattern width of the photoresist film is narrowed, and the photoresist film is used to prevent pattern collapse. Even if the film is thinly coated, the substrate can be processed by selecting an appropriate etching gas, which will be described later.
- the resist underlayer film can be processed by using a fluorine-based gas having a sufficiently high etching rate with respect to the photoresist film as an etching gas, and oxygen gas having a sufficiently high etching rate with respect to the resist underlayer film can be used.
- An organic underlayer film can be processed by using a fluorine-based gas as an etching gas, and a substrate can be processed by using a fluorine-based gas having a sufficiently high etching rate with respect to an organic underlayer film as an etching gas. can.
- the substrate and coating method that can be used at this time are the same as those described above.
- a photoresist material layer (resist film) is formed on the resist underlayer film.
- the resist film can be formed by a well-known method, that is, by applying a coating-type resist material (resist film-forming composition) onto the resist underlayer film and baking the composition.
- the film thickness of the resist film is, for example, 10 nm to 10,000 nm, 100 nm to 2,000 nm, 200 nm to 1,000 nm, or 30 nm to 200 nm.
- the photoresist material used for the resist film formed on the resist underlayer film is not particularly limited as long as it is sensitive to the light used for exposure (for example, KrF excimer laser, ArF excimer laser, etc.).
- both negative photoresist materials and positive photoresist materials can be used.
- a positive photoresist material composed of a novolac resin and a 1,2-naphthoquinonediazide sulfonic acid ester a chemically amplified photoresist composed of a binder having a group that decomposes with an acid to increase the alkali dissolution rate
- a photoacid generator for example, a positive photoresist material composed of a novolac resin and a 1,2-naphthoquinonediazide sulfonic acid ester, a chemically amplified photoresist composed of a binder having a group that decomposes with an acid to increase the alkali dissolution rate.
- a chemically amplified photoresist material composed of a low-molecular-weight compound, an alkali-soluble binder, and a photoacid generator that decomposes with an acid to increase the alkali dissolution rate of the photoresist material
- a chemically amplified photoresist material composed of a binder having a group that causes a reaction, a low-molecular-weight compound that is decomposed by an acid to increase the alkali dissolution rate of the photoresist material, and a photoacid generator.
- a resist film for electron beam lithography also referred to as an electron beam resist film
- a resist film for EUV lithography also referred to as an EUV resist film
- the composition for forming a silicon-containing resist underlayer film of the present invention can be used for forming a resist underlayer film for electron beam lithography or for forming a resist underlayer film for EUV lithography. It is particularly suitable as a composition for forming a resist underlayer film for EUV lithography.
- the electron beam resist material for forming the electron beam resist film either a negative material or a positive material can be used.
- Specific examples thereof include a chemically amplified resist material composed of an acid generator and a binder having a group that is decomposed by an acid to change the alkali dissolution rate;
- a chemically amplified resist material composed of a low-molecular-weight compound that changes the dissolution rate, a binder having a group that decomposes with an acid generator and an acid to change the alkali dissolution rate, and a binder that decomposes with the acid to change the alkali dissolution rate of the resist material.
- non-chemically amplified resist materials made of binders Even when these electron beam resist materials are used, a resist film pattern can be formed in the same manner as when a photoresist material is used with an electron beam as the irradiation source.
- the EUV resist material for forming the EUV resist film a methacrylate resin-based resist material and a metal oxide resist material can be used.
- metal oxide resist materials include coating compositions containing metal oxo-hydroxo networks having organic ligands via metal carbon bonds and/or metal carboxylate bonds, described in JP-A-2019-113855. .
- the resist film formed on the upper layer of the resist underlayer film is exposed through a predetermined mask (reticle).
- KrF excimer laser (wavelength: 248 nm), ArF excimer laser (wavelength: 193 nm), F2 excimer laser ( wavelength: 157 nm), EUV (wavelength: 13.5 nm), electron beam, etc. can be used for exposure.
- a post-exposure bake can be performed, if desired.
- the post-exposure heating is performed under conditions appropriately selected from a heating temperature of 70° C. to 150° C. and a heating time of 0.3 minutes to 10 minutes.
- a developer for example, an alkaline developer
- a developer for example, an alkaline developer
- alkali metal hydroxides such as potassium hydroxide and sodium hydroxide
- alkaline aqueous solutions examples include alkaline aqueous solutions (alkali developers) such as aqueous solutions of amines such as amine, propylamine and ethylenediamine. Furthermore, a surfactant or the like can be added to these developers.
- alkali developers such as aqueous solutions of amines such as amine, propylamine and ethylenediamine.
- a surfactant or the like can be added to these developers.
- the development conditions are appropriately selected from a temperature of 5 to 50° C. and a time of 10 to 600 seconds.
- an organic solvent can be used as a developer, and development is performed with the developer (solvent) after exposure.
- the developer solvent
- the photoresist film in the unexposed portions is removed to form a pattern of the photoresist film.
- Examples of the developer (organic solvent) include methyl acetate, butyl acetate, ethyl acetate, isopropyl acetate, amyl acetate, isoamyl acetate, ethyl methoxyacetate, ethyl ethoxyacetate, propylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, Ethylene glycol monopropyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monophenyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol mono Ethyl ether acetate, 2-methoxybutyl acetate, 3-methoxybutyl
- the resist underlayer film (intermediate layer) is removed, and then the patterned photoresist film and patterned resist underlayer film (intermediate layer) are removed.
- the organic underlayer film (lower layer) is removed.
- the substrate is processed using the patterned resist underlayer film (intermediate layer) and the patterned organic underlayer film (lower layer) as protective films.
- the removal (patterning) of the resist underlayer film (intermediate layer), which is performed using the pattern of the resist film (upper layer) as a protective film, is performed by dry etching using tetrafluoromethane (CF 4 ) and perfluorocyclobutane (C 4 F 8 ).
- perfluoropropane ( C3F8 ) trifluoromethane, carbon monoxide, argon, oxygen, nitrogen, sulfur hexafluoride, difluoromethane, nitrogen trifluoride, chlorine trifluoride, chlorine, trichloroborane and dichloroborane, etc. of gas can be used.
- a halogen-based gas for the dry etching of the resist underlayer film.
- a resist film photoresist film
- a resist underlayer film containing a large amount of silicon atoms is rapidly removed by a halogen-based gas. Therefore, reduction in the thickness of the photoresist film due to dry etching of the resist underlayer film can be suppressed. As a result, it becomes possible to use a thin photoresist film. Therefore , the dry etching of the resist underlayer film is preferably performed using a fluorine - based gas. 8 ), trifluoromethane, difluoromethane (CH 2 F 2 ), and the like, but are not limited thereto.
- patterned resist film (top layer) and patterned (with patterned resist film (top layer) if remaining) The removal (patterning) of the organic underlayer film (lower layer), which is performed using the resist underlayer film (intermediate layer) as a protective film, is performed using an oxygen-based gas (oxygen gas, oxygen/carbonyl sulfide (COS) mixed gas, etc.) It is preferably performed by dry etching with. This is because the resist underlayer film of the present invention containing a large amount of silicon atoms is difficult to remove by dry etching with an oxygen-based gas.
- oxygen-based gas oxygen gas, oxygen/carbonyl sulfide (COS) mixed gas, etc.
- the (semiconductor) substrate is processed (patterned) using a patterned resist underlayer film (intermediate layer) and, if desired, a patterned organic underlayer film (lower layer) as a protective film. It is preferably done by etching.
- fluorine-based gases include tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, and difluoromethane (CH 2 F 2 ). mentioned.
- removal of the resist underlayer film may be performed.
- the removal of the resist underlayer film can be performed by dry etching or wet etching (wet method).
- the dry etching of the resist underlayer film is preferably performed with a fluorine - based gas as mentioned in the patterning. 8 ), trifluoromethane, difluoromethane (CH 2 F 2 ), and the like, but are not limited to these.
- Chemicals used for wet etching of the resist underlayer film include dilute hydrofluoric acid (hydrofluoric acid), buffered hydrofluoric acid (mixed solution of HF and NH 4 F), aqueous solution containing hydrochloric acid and hydrogen peroxide (SC -2 chemical solution), an aqueous solution containing sulfuric acid and hydrogen peroxide (SPM chemical solution), an aqueous solution containing hydrofluoric acid and hydrogen peroxide (FPM chemical solution), and an aqueous solution containing ammonia and hydrogen peroxide (SC-1 chemical solution) and other alkaline solutions.
- hydrofluoric acid hydrofluoric acid
- buffered hydrofluoric acid mixed solution of HF and NH 4 F
- SC -2 chemical solution aqueous solution containing hydrochloric acid and hydrogen peroxide
- SPM chemical solution sulfuric acid and hydrogen peroxide
- FPM chemical solution aqueous solution containing hydrofluoric acid and hydrogen peroxide
- SC-1 chemical solution a
- ammonia hydrogen peroxide solution obtained by mixing ammonia, hydrogen peroxide solution and water, ammonia, tetramethylammonium hydroxide (TMAH), tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, choline hydroxide, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, DBU (diazabicycloundecene), DBN (diazabicyclononene), hydroxylamine, 1-butyl-1 -methylpyrrolidinium hydroxide, 1-propyl-1-methylpyrrolidinium hydroxide, 1-butyl-1-methylpiperidinium hydroxide, 1-propyl-1-methylpiperidinium hydroxide, mepicquat Mention may be made of aqueous
- an organic antireflection film can be formed on the upper layer of the resist underlayer film before forming the resist film.
- the antireflection coating composition used there is not particularly limited, and can be used by arbitrarily selecting, for example, those conventionally used in lithographic processes. , a spinner, or a coater, and baking to form the antireflection film.
- the substrate to which the silicon-containing resist underlayer film-forming composition is applied may have an organic or inorganic antireflection film formed on its surface by a CVD method or the like.
- An underlayer film can also be formed.
- the resist underlayer film of the present invention is formed thereon after forming an organic underlayer film on the substrate, the substrate to be used has an organic or inorganic antireflection film formed on its surface by a CVD method or the like. may have.
- the resist underlayer film formed from the composition for forming a silicon-containing resist underlayer film may also absorb light. In such a case, it can function as an antireflection film having the effect of preventing reflected light from the substrate. Furthermore, the resist underlayer film is a layer for preventing interaction between the substrate and the resist film (photoresist film, etc.), and prevents adverse effects on the substrate of materials used for the resist film or substances generated when the resist film is exposed to light.
- It is used as a layer having a function to prevent diffusion, a layer having a function to prevent diffusion of substances generated from the substrate during heating and baking into the resist film, and a barrier layer for reducing the poisoning effect of the resist film due to the dielectric layer of the semiconductor substrate. is also possible.
- the resist underlayer film can be applied to a substrate in which via holes used in the dual damascene process are formed, and can be used as a filling material (embedding material) capable of filling the holes without gaps. It can also be used as a planarizing material for planarizing the uneven surface of a semiconductor substrate.
- the resist underlayer film of the present invention as an underlayer film of the EUV resist film, has a function as a hard mask. For example, UV (ultraviolet) light and DUV (deep ultraviolet) light (:ArF light, KrF light) can be prevented from being reflected from the substrate or the interface.
- the composition for forming a silicon-containing resist underlayer film of the present invention can be suitably used for forming an underlayer antireflection film of an EUV resist film. That is, it can efficiently prevent reflection as a lower layer of the EUV resist film.
- the process can be performed in the same manner as for the photoresist underlayer film.
- the semiconductor substrate can be suitably processed. Further, as described above, the step of forming an organic underlayer film, the step of forming a resist underlayer film on the organic underlayer film using the silicon-containing resist underlayer film-forming composition of the present invention, and the step of forming the resist underlayer film According to the method for manufacturing a semiconductor device, which includes the step of forming a resist film on the film, it is possible to process a semiconductor substrate with high accuracy and reproducibility, so that stable manufacture of semiconductor devices can be expected.
- the equipment and conditions used for analyzing the physical properties of the samples are as follows.
- the molecular weight of the polysiloxane used in the present invention is the molecular weight obtained in terms of polystyrene by GPC analysis.
- GPC measurement conditions include, for example, a GPC device (trade name HLC-8220GPC, manufactured by Tosoh Corporation), a GPC column (trade name Shodex (registered trademark) KF803L, KF802, KF801, manufactured by Showa Denko KK), and a column temperature of 40°C.
- the eluent (elution solvent) is tetrahydrofuran
- the flow rate (flow rate) is 1.0 mL/min
- the standard sample is polystyrene (manufactured by Showa Denko KK).
- Amount of residual nitric acid The amount of nitric acid remaining in the system was measured by ion chromatography.
- the obtained polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,200 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 3 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.08%.
- reaction by-products, ethanol and water were distilled off under reduced pressure and concentrated to obtain a hydrolyzed condensate (polymer) solution.
- Propylene glycol monoethyl ether was further added to the obtained solution, and the concentration was adjusted so that the solvent ratio of 100% propylene glycol monoethyl ether was 20% by mass in terms of solid residue at 140 ° C., and a nylon filter (pore size 0 .1 ⁇ m).
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,000 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 2 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.08%.
- reaction by-products, ethanol and water were distilled off under reduced pressure and concentrated to obtain a hydrolyzed condensate (polymer) solution.
- Propylene glycol monoethyl ether was further added to the obtained solution, and the concentration was adjusted so that the solvent ratio of 100% propylene glycol monoethyl ether was 20% by mass in terms of solid residue at 140 ° C., and a nylon filter (pore size 0 .1 ⁇ m).
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 2,800 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 2 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.09%.
- the obtained polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,300 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 3 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.1%.
- the obtained polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,500 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 3 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.09%.
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,000 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 4 mol % relative to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.1%.
- reaction by-products ethanol, methanol and water, were distilled off under reduced pressure and concentrated to obtain a hydrolyzed condensate (polymer) solution.
- Propylene glycol monoethyl ether was further added to the obtained solution, and the concentration was adjusted so that the solvent ratio of 100% propylene glycol monoethyl ether was 20% by mass in terms of solid residue at 140 ° C., and a nylon filter (pore size 0 .1 ⁇ m).
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,200 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 3 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.16%.
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,000 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 4 mol % relative to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.15%.
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,200 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 3 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.16%.
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 2,900 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 3 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.15%.
- reaction by-products ethanol, methanol and water, were distilled off under reduced pressure and concentrated to obtain a hydrolyzed condensate (polymer) solution.
- Propylene glycol monoethyl ether was further added to the obtained solution, and the concentration was adjusted so that the solvent ratio of 100% propylene glycol monoethyl ether was 20% by mass in terms of solid residue at 140 ° C., and a nylon filter (pore size 0 .1 ⁇ m).
- the resulting polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 2,800 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 4 mol % with respect to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.14%.
- Propylene glycol monoethyl ether was further added to the obtained solution, and the concentration was adjusted so that the solvent ratio of 100% propylene glycol monoethyl ether was 20% by mass in terms of solid residue at 140 ° C., and a nylon filter (pore size 0 .1 ⁇ m).
- the obtained polymer contained polysiloxane having a structure represented by the following formula, and had a weight average molecular weight of Mw 3,300 in terms of polystyrene by GPC. Also, the amount of capping with propylene glycol monoethyl ether was 4 mol % relative to Si atoms by 1 H-NMR. The amount of residual nitric acid in the polymer solution was 0.08%.
- composition for forming resist underlayer film The proportions shown in Table 1 of the polysiloxane (polymer), stabilizer (additive 1), curing catalyst (additive 2), and solvent obtained in the above synthesis example. and filtered through a 0.1 ⁇ m fluororesin filter to prepare a composition for forming a resist underlayer film. Each addition amount in Table 1 is shown in parts by mass.
- the hydrolytic condensate (polymer) is prepared as a solution containing the condensate obtained in Synthesis Example, but the addition ratio of the polymer in Table 1 is not the amount of the polymer solution added, but the polymer itself. is added.
- Examples 1 to 11 and Comparative Example 1 further include nitric acid contained in the polymer solutions prepared in Synthesis Examples 1 to 11 and Comparative Synthesis Example 1.
- the obtained solution was filtered using a polyethylene microfilter with a pore size of 0.10 ⁇ m, and further filtered using a polyethylene microfilter with a pore size of 0.05 ⁇ m to prepare a composition for forming an organic underlayer film. .
- the film thickness of the lower layer film after coating was measured, and the ratio (%) of change in film thickness after coating of the mixed solvent was calculated based on the film thickness before coating of the mixed solvent as a reference (100%).
- a film thickness change of 1% or less before and after application of the mixed solvent was evaluated as "good", and a film thickness change of more than 1% was evaluated as "not cured”.
- an alkaline developer tetramethylammonium hydroxide (TMAH) 2.38% aqueous solution
- the film thickness of the film was measured, and the ratio (%) of change in film thickness after application of the developer was calculated with the film thickness before application of the developer as a reference (100%).
- a film thickness change of 1% or less before and after application of the developer was evaluated as "good”, and a film thickness change of more than 1% was evaluated as "not cured”.
- Table 2 shows the results obtained.
- PEB post-exposure heating
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Abstract
Description
近年、半導体デバイスの高集積度化が進み、使用される活性光線もKrFエキシマレーザー(248nm)からArFエキシマレーザー(193nm)へと短波長化される傾向にある。活性光線の短波長化に伴い、活性光線の半導体基板からの反射の影響が大きな問題となる中、フォトレジストと被加工基板の間に反射防止膜(Bottom Anti-Reflective Coating、BARC)と呼ばれるレジスト下層膜を設ける方法が広く適用されるようになってきた。
[1] 220nm~300nmの波長領域における光学吸光係数(k値)の最大値が、0.05以上である、シリコン含有レジスト下層膜。
[2] ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する、[1]に記載のシリコン含有レジスト下層膜。
[3] EUVリソグラフィー用レジスト下層膜である、[1]又は[2]に記載のシリコン含有レジスト下層膜。
[4] [A]成分:ポリシロキサン、及び
[C]成分:溶媒
を含有し、
前記ポリシロキサンが、ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する加水分解性シラン(A)由来の構成単位を含む、シリコン含有レジスト下層膜形成用組成物。
[5] [A’]成分:ポリシロキサン、
[B]成分:ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する加水分解性シラン(A)、及び
[C]成分:溶媒
を含有する、シリコン含有レジスト下層膜形成用組成物。
[6] 前記加水分解性シラン(A)が、下記式(A-1)で表される化合物である、[4]又は[5]に記載のシリコン含有レジスト下層膜形成用組成物。
bは0~2の整数を表す。
a+bは、1~3の整数を表す。
R1はニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有しかつイオン結合を有していてもよい基を表す。
R2は置換されていてもよいアルキル基、置換されていてもよいアリール基(ただし、フェナントリル基を除く。)、置換されていてもよいアラルキル基、置換されていてもよいハロゲン化アルキル基、置換されていてもよいハロゲン化アリール基、置換されていてもよいハロゲン化アラルキル基、置換されていてもよいアルコキシアルキル基、置換されていてもよいアルコキシアリール基、置換されていてもよいアルコキシアラルキル基、若しくは置換されていてもよいアルケニル基を表すか、又はエポキシ基を有する有機基、アクリロイル基を有する有機基、メタクリロイル基を有する有機基、メルカプト基を有する有機基、アミノ基を有する有機基、アルコキシ基を有する有機基、スルホニル基(ただし、メトキシフェニルスルホニル基を除く。)を有する有機基、若しくはシアノ基を有する有機基、又はそれらの2種以上の組み合わせを表す。
Xはアルコキシ基、アラルキルオキシ基、アシルオキシ基、又はハロゲン原子を表す。
R1、R2及びXがそれぞれ複数の場合、複数のR1、R2及びXは同一でもよいし、異なっていてもよい。)
[7] 前記式(A-1)中のR1が、下記式(A-2a)、式(A-2b)、又は式(A-2c)で表される、[6]に記載のシリコン含有レジスト下層膜形成用組成物。
式(A-2b)中、R12は、イオン結合を有していてもよい2価の有機基を表す。dは1~5の整数を表す。
式(A-2c)中、R13は、単結合、又はイオン結合を有していてもよい2価の有機基を表す。
*は結合手を表す。)
[8] 前記[A]成分であるポリシロキサンが、シラノール基の一部がアルコール変性された又はアセタール保護されたポリシロキサン変性物である、[4]に記載のシリコン含有レジスト下層膜形成用組成物。
[9] 前記[A’]成分であるポリシロキサンが、シラノール基の一部がアルコール変性された又はアセタール保護されたポリシロキサン変性物である、[5]に記載のシリコン含有レジスト下層膜形成用組成物。
[10] 前記[C]成分が、アルコール系溶媒を含有する、[4]~[9]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物。
[11] 前記[C]成分が、プロピレングリコールモノアルキルエーテルを含有する、[10]に記載のシリコン含有レジスト下層膜形成用組成物。
[12] [D]成分:硬化触媒を更に含有する、[4]~[11]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物。
[13] [E]成分:硝酸を更に含有する、[4]~[12]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物。
[14] 前記[C]成分が、水を含有する、[4]~[13]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物。
[15] EUVリソグラフィー用レジスト下層膜形成用である、[4]~[14]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物。
[16] [4]~[15]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物の硬化物である、シリコン含有レジスト下層膜。
[17] 半導体基板と、
[1]~[3]のいずれかに記載のシリコン含有レジスト下層膜、及び[16]に記載のシリコン含有レジスト下層膜のいずれかと、
を備える半導体加工用基板。
[18] 基板上に、有機下層膜を形成する工程と、
前記有機下層膜の上に、[4]~[15]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物を用いてレジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜を形成する工程と、
を含む、半導体素子の製造方法。
[19] 前記レジスト膜が、EUVリソグラフィー用レジストから形成される、
[18]に記載の半導体素子の製造方法。
[20] 前記レジスト下層膜を形成する工程において、ナイロンフィルタろ過したシリコン含有レジスト下層膜形成用組成物を用いる、
[18]又は[19]に記載の半導体素子の製造方法。
[21] 半導体基板上に有機下層膜を形成する工程と、
前記有機下層膜の上に、[4]~[15]のいずれかに記載のシリコン含有レジスト下層膜形成用組成物を塗布し、焼成して、レジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜形成用組成物を塗布し、レジスト膜を形成する工程と、
前記レジスト膜を露光、現像し、レジストパターンを得る工程と、
前記レジストパターンをマスクに用い、前記レジスト下層膜をエッチングする工程と、
パターン化された前記レジスト下層膜をマスクとして用い、前記有機下層膜をエッチングする工程と、
を含む、パターン形成方法。
[22] 前記有機下層膜をエッチングする工程の後に、薬液を用いた湿式法により前記レジスト下層膜を除去する工程、
を更に含む、[21]に記載のパターン形成方法。
[23] 前記レジスト膜が、EUVリソグラフィー用レジストから形成される、
[21]又は[22]に記載のパターン形成方法。
本発明のシリコン含有レジスト下層膜は、220nm~300nmの波長領域における光学吸光係数(k値)の最大値が、0.05以上である。
シリコン含有レジスト下層膜の、220nm~300nmの波長領域における光学吸光係数(k値)の最大値が0.05以上であることによって、EUV光により発生した2次電子をシリコン含有レジスト下層膜が効率よく吸収することが可能となる。そのことによって、シリコン含有レジスト下層膜からEUVリソグラフィー用レジストに高いコントラストを与える。そうすると、微細レジストパターンの倒れを防ぐことができ、その結果、レジストパターンの解像性を高めることができる。
シリコン含有レジスト下層膜は、好ましくは、後述する式(A-2a)、式(A-2b)、又は式(A-2c)で表される基を有する。
<第1の実施形態>
本発明のシリコン含有レジスト下層膜形成用組成物の第1の実施形態は、[A]成分としてのポリシロキサン、及び[C]成分としての溶媒を含有し、更に必要に応じて、その他の成分を含有する。
[A]成分としてのポリシロキサンは、ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する加水分解性シラン(A)由来の構成単位(モノマー単位又は繰り返し単位)を含む。
以下、「ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれか」を「特定基」と称することがある。
本発明のシリコン含有レジスト下層膜形成用組成物の第2の実施形態は、[A’]成分としてのポリシロキサン、[B]成分としてのニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する加水分解性シラン(A)、及び[C]成分としての溶媒を含有し、更に必要に応じて、その他の成分を含有する。
なお、本発明において、ニトロフェニル基のフェニル基には、ニトロ基が複数置換されていてもよい。
また、本発明において、メトキシフェニルスルホニル基のフェニル基には、メトキシ基が複数置換されていてもよい。
また、本発明において、メトキシフェニルスルホニル基の硫黄原子には、スルホニル(-SO2-)を構成する酸素原子以外の酸素原子が結合していてもよいし、窒素原子が結合していてもよい。
本発明のシリコン含有レジスト下層膜形成用組成物から形成されるシリコン含有レジスト下層膜が特定基を有することによって、微細レジストパターンの倒れを防ぐことができ、その結果レジストパターンの解像性を高めることができる。シリコン含有レジスト下層膜が特定基などの200~300nmの波長の光に対して高い吸収を有する基を有することによって、EUV光照射によりレジストおよびレジスト下層膜から発生した2次電子を効率よく吸収することが可能となる。そのことによってレジスト下層膜からEUVリソグラフィー用レジストに高いコントラストを与える。そうすると、微細レジストパターンの倒れを防ぐことができ、その結果、レジストパターンの解像性を高めることができる。
特定基を有する加水分解性シラン(A)が有する特定基は、通常、ケイ素原子に、連結基を介して結合している。
加水分解性シラン(A)は、2以上の特定基を有していてもよい。その場合、2以上の特定基は、ケイ素原子に結合する1つの連結基にそれぞれ結合していてもよいし、2以上の特定基は、それぞれが、ケイ素原子に、異なる連結基を介して結合していてもよい。
連結基は、例えば、有機基である。連結基は、イオン結合を有していてもよい。連結基がイオン結合を有する場合、連結基は、特定基とケイ素原子とを結ぶ原子の列の中にイオン結合を有していてもよいし、特定基とケイ素原子とを結ぶ原子の列から分岐した原子の列の中にイオン結合を有していてもよい。
連結基の炭素原子数としては、特に限定されないが、連結基の炭素原子数は、好ましくは1~30であり、より好ましくは1~20である。
連結基は、通常、水素原子を有する。連結基は、酸素原子を有していてもよいし、窒素原子を有していてもよい。
bは0~2の整数を表す。
a+bは、1~3の整数を表す。
R1はニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有しかつイオン結合を有していてもよい基を表す。
R2は置換されていてもよいアルキル基、置換されていてもよいアリール基(ただし、フェナントリル基を除く。)、置換されていてもよいアラルキル基、置換されていてもよいハロゲン化アルキル基、置換されていてもよいハロゲン化アリール基、置換されていてもよいハロゲン化アラルキル基、置換されていてもよいアルコキシアルキル基、置換されていてもよいアルコキシアリール基、置換されていてもよいアルコキシアラルキル基、若しくは置換されていてもよいアルケニル基を表すか、又はエポキシ基を有する有機基、アクリロイル基を有する有機基、メタクリロイル基を有する有機基、メルカプト基を有する有機基、アミノ基を有する有機基、アルコキシ基を有する有機基、スルホニル基(ただし、メトキシフェニルスルホニル基を除く。)を有する有機基、若しくはシアノ基を有する有機基、又はそれらの2種以上の組み合わせを表す。
Xはアルコキシ基、アラルキルオキシ基、アシルオキシ基、又はハロゲン原子を表す。
R1、R2及びXがそれぞれ複数の場合、複数のR1、R2及びXは同一でもよいし、異なっていてもよい。)
R1が有する特定基は、1つであってもよいし、複数であってもよい。
R1の炭素原子数としては、特に限定されないが、R1の炭素原子数は、好ましくは1~30であり、より好ましくは1~20である。
R1は、通常、水素原子を有する。R1は、特定基及び水素原子の他に、酸素原子を有していてもよいし、窒素原子を有していてもよい。
R1は、イオン結合を有していてもよい。R1がイオン結合を有する場合、R1は、特定基とケイ素原子とを結ぶ原子の列の中にイオン結合を有していてもよいし、特定基とケイ素原子とを結ぶ原子の列から分岐した原子の列の中にイオン結合を有していてもよい。
式(A-2b)中、R12は、イオン結合を有していてもよい2価の有機基を表す。dは1~5の整数を表す。
式(A-2c)中、R13は、単結合、又はイオン結合を有していてもよい2価の有機基を表す。
*は結合手を表す。)
R1は、イオン結合を有していてもよい。R1がイオン結合を有する場合、R1は、特定基とケイ素原子とを結ぶ原子の列の中にイオン結合を有していてよいし、特定基とケイ素原子とを結ぶ原子の列から分岐した原子の列の中にニトロ基を有していてもよい。
dは1~3の整数が好ましく、1がより好ましい。
式(A-2b)において、メトキシ基は、硫黄原子が結合する位置に対して、オルト位又はパラ位でベンゼン環に結合していることが好ましく、パラ位でベンゼン環に結合していることが好ましい。
R11としては、単結合、又は下記式(A-2-1)~式(A-2-7)、式(A-2-10)、及び式(A-2-11)で表される2価の有機基のいずれかであることが好ましい。
R12としては、下記式(A-2-1)、式(A-2-3)、式(A-2-8)、及び式(A-2-9)で表される2価の有機基のいずれかであることが好ましい。
R13としては、単結合、又は下記式(A-2-1)~式(A-2-7)、式(A-2-10)、及び式(A-2-11)で表される2価の有機基のいずれかであることが好ましい。
式(A-2-2)中、R31は炭素原子数1~6のアルキレン基を表す。R32は水素原子又は炭素原子数1~4のアルキル基を表す。
式(A-2-3)中、R41は炭素原子数1~6のアルキレン基を表す。R42は水素原子又は炭素原子数1~4のアルキル基を表す。
式(A-2-4)中、R51は炭素原子数1~6のアルキレン基を表す。
式(A-2-5)中、R61は炭素原子数1~6のアルキレン基を表す。
式(A-2-6)中、R71は炭素原子数1~6のアルキレン基を表す。R72及びR73はそれぞれ独立して水素原子又は炭素原子数1~4のアルキル基を表す。
式(A-2-7)中、R81は炭素原子数1~6のアルキレン基を表す。
式(A-2-8)中、R91は炭素原子数1~6のアルキレン基を表す。R92及びR93はそれぞれ独立して水素原子又は炭素原子数1~4のアルキル基を表す。
式(A-2-9)中、R101は炭素原子数1~6のアルキレン基を表す。
式(A-2-10)中、R111は炭素原子数1~6のアルキレン基を表す。R112及びR113はそれぞれ独立して水素原子又は炭素原子数1~4のアルキル基を表す。
式(A-2-11)中、R121は炭素原子数1~6のアルキレン基を表す。
式(A-2-1)~式(A-2-11)中、*1はSiと結合する結合手を表す。*2は式(A-2a)中のベンゼン環、式(A-2b)中の硫黄原子、又は式(A-2c)中のフェナントレン環と結合する結合手を表す。
式(A-2-5)中、*3は、*4又は*5の炭素原子と結合する結合手を表す。)
R32、R42、R72、R73、R92、R93、R112、及びR113としては、水素原子、メチル基、エチル基が好ましい。
アルキル基は、直鎖状、分枝鎖状、環状のいずれでよく、その炭素原子数は、特に限定されるものではないが、好ましくは40以下、より好ましくは30以下、より一層好ましくは20以下、更に好ましくは10以下である。
アルキル基として、直鎖状の又は分枝鎖状アルキル基の具体例としては、メチル基、エチル基、n-プロピル基、i-プロピル基、n-ブチル基、i-ブチル基、s-ブチル基、t-ブチル基、n-ペンチル基、1-メチル-n-ブチル基、2-メチル-n-ブチル基、3-メチル-n-ブチル基、1,1-ジメチル-n-プロピル基、1,2-ジメチル-n-プロピル基、2,2-ジメチル-n-プロピル基、1-エチル-n-プロピル基、n-ヘキシル基、1-メチル-n-ペンチル基、2-メチル-n-ペンチル基、3-メチル-n-ペンチル基、4-メチル-n-ペンチル基、1,1-ジメチル-n-ブチル基、1,2-ジメチル-n-ブチル基、1,3-ジメチル-n-ブチル基、2,2-ジメチル-n-ブチル基、2,3-ジメチル-n-ブチル基、3,3-ジメチル-n-ブチル基、1-エチル-n-ブチル基、2-エチル-n-ブチル基、1,1,2-トリメチル-n-プロピル基、1,2,2-トリメチル-n-プロピル基、1-エチル-1-メチル-n-プロピル基及び1-エチル-2-メチル-n-プロピル基等が挙げられる。
なお、本明細書において、「i」は「iso」、「s」は「sec」、「t」は「tert」を意味する。
例えばアリ-ル基として炭素原子数6~20のアリール基が挙げられ、一例としてフェニル基、1-ナフチル基、2-ナフチル基、1-アントリル基、2-アントリル基、9-アントリル基、1-ナフタセニル基、2-ナフタセニル基、5-ナフタセニル基、2-クリセニル基、1-ピレニル基、2-ピレニル基、ペンタセニル基、ベンゾピレニル基、トリフェニレニル基;ビフェニル-2-イル基(o-ビフェニリル基)、ビフェニル-3-イル基(m-ビフェニリル基)、ビフェニル-4-イル基(p-ビフェニリル基)、パラテルフェニル-4-イル基、メタテルフェニル-4-イル基、オルトテルフェニル-4-イル基、1,1’-ビナフチル-2-イル基、2,2’-ビナフチル-1-イル基等が挙げられるが、これらに限定されない。
アラルキル基の具体例としては、フェニルメチル基(ベンジル基)、2-フェニルエチレン基、3-フェニル-n-プロピル基、4-フェニル-n-ブチル基、5-フェニル-n-ペンチル基、6-フェニル-n-ヘキシル基、7-フェニル-n-ヘプチル基、8-フェニル-n-オクチル基、9-フェニル-n-ノニル基、10-フェニル-n-デシル基等が挙げられるが、これらに限定されない。
ハロゲン原子としては、フッ素原子、塩素原子、臭素原子、ヨウ素原子等が挙げられる。
ハロゲン化アルキル基の具体例としては、モノフルオロメチル基、ジフルオロメチル基、トリフルオロメチル基、ブロモジフルオロメチル基、2-クロロエチル基、2-ブロモエチル基、1,1-ジフルオロエチル基、2,2,2-トリフルオロエチル基、1,1,2,2-テトラフルオロエチル基、2-クロロ-1,1,2-トリフルオロエチル基、ペンタフルオロエチル基、3-ブロモプロピル基、2,2,3,3-テトラフルオロプロピル基、1,1,2,3,3,3-ヘキサフルオロプロピル基、1,1,1,3,3,3-ヘキサフルオロプロパン-2-イル基、3-ブロモ-2-メチルプロピル基、4-ブロモブチル基、パーフルオロペンチル基等が挙げられるが、これらに限定されない。
ハロゲン化アリール基の具体例としては、2-フルオロフェニル基、3-フルオロフェニル基、4-フルオロフェニル基、2,3-ジフルオロフェニル基、2,4-ジフルオロフェニル基、2,5-ジフルオロフェニル基、2,6-ジフルオロフェニル基、3,4-ジフルオロフェニル基、3,5-ジフルオロフェニル基、2,3,4-トリフルオロフェニル基、2,3,5-トリフルオロフェニル基、2,3,6-トリフルオロフェニル基、2,4,5-トリフルオロフェニル基、2,4,6-トリフルオロフェニル基、3,4,5-トリフルオロフェニル基、2,3,4,5-テトラフルオロフェニル基、2,3,4,6-テトラフルオロフェニル基、2,3,5,6-テトラフルオロフェニル基、ペンタフルオロフェニル基、2-フルオロ-1-ナフチル基、3-フルオロ-1-ナフチル基、4-フルオロ-1-ナフチル基、6-フルオロ-1-ナフチル基、7-フルオロ-1-ナフチル基、8-フルオロ-1-ナフチル基、4,5-ジフルオロ-1-ナフチル基、5,7-ジフルオロ-1-ナフチル基、5,8-ジフルオロ-1-ナフチル基、5,6,7,8-テトラフルオロ-1-ナフチル基、ヘプタフルオロ-1-ナフチル基、1-フルオロ-2-ナフチル基、5-フルオロ-2-ナフチル基、6-フルオロ-2-ナフチル基、7-フルオロ-2-ナフチル基、5,7-ジフルオロ-2-ナフチル基、ヘプタフルオロ-2-ナフチル基等が挙げられ、またこれらの基におけるフッ素原子(フルオロ基)が塩素原子(クロロ基)、臭素原子(ブロモ基)、ヨウ素原子(ヨード基)に任意に置換された基が挙げられるが、これらに限定されない。
ハロゲン化アラルキル基の具体例としては、2-フルオロベンジル基、3-フルオロベンジル基、4-フルオロベンジル基、2,3-ジフルオロベンジル基、2,4-ジフルオロベンジル基、2,5-ジフルオロベンジル基、2,6-ジフルオロベンジル基、3,4-ジフルオロベンジル基、3,5-ジフルオロベンジル基、2,3,4-トリフルオロベンジル基、2,3,5-トリフルオロベンジル基、2,3,6-トリフルオロベンジル基、2,4,5-トリフルオロベンジル基、2,4,6-トリフルオロベンジル基、2,3,4,5-テトラフルオロベンジル基、2,3,4,6-テトラフルオロベンジル基、2,3,5,6-テトラフルオロベンジル基、2,3,4,5,6-ペンタフルオロベンジル基等が挙げられ、またこれらの基におけるフッ素原子(フルオロ基)が塩素原子(クロロ基)、臭素原子(ブロモ基)、ヨウ素原子(ヨード基)に任意に置換された基が挙げられるが、これらに限定されない。
直鎖状の又は分枝状のアルコキシ基としては、例えばメトキシ基、エトキシ基、n-プロポキシ基、i-プロポキシ基、n-ブトキシ基、i-ブトキシ基、s-ブトキシ基、t-ブトキシ基、n-ペンチロキシ基、1-メチル-n-ブトキシ基、2-メチル-n-ブトキシ基、3-メチル-n-ブトキシ基、1,1-ジメチル-n-プロポキシ基、1,2-ジメチル-n-プロポキシ基、2,2-ジメチル-n-プロポキシ基、1-エチル-n-プロポキシ基、n-ヘキシロキシ基、1-メチル-n-ペンチロキシ基、2-メチル-n-ペンチロキシ基、3-メチル-n-ペンチロキシ基、4-メチル-n-ペンチロキシ基、1,1-ジメチル-n-ブトキシ基、1,2-ジメチル-n-ブトキシ基、1,3-ジメチル-n-ブトキシ基、2,2-ジメチル-n-ブトキシ基、2,3-ジメチル-n-ブトキシ基、3,3-ジメチル-n-ブトキシ基、1-エチル-n-ブトキシ基、2-エチル-n-ブトキシ基、1,1,2-トリメチル-n-プロポキシ基、1,2,2-トリメチル-n-プロポキシ基、1-エチル-1-メチル-n-プロポキシ基及び1-エチル-2-メチル-n-プロポキシ基等が挙げられる。
また環状のアルコキシ基としては、例えばシクロプロポキシ基、シクロブトキシ基、1-メチル-シクロプロポキシ基、2-メチル-シクロプロポキシ基、シクロペンチロキシ基、1-メチル-シクロブトキシ基、2-メチル-シクロブトキシ基、3-メチル-シクロブトキシ基、1,2-ジメチル-シクロプロポキシ基、2,3-ジメチル-シクロプロポキシ基、1-エチル-シクロプロポキシ基、2-エチル-シクロプロポキシ基、シクロヘキシロキシ基、1-メチル-シクロペンチロキシ基、2-メチル-シクロペンチロキシ基、3-メチル-シクロペンチロキシ基、1-エチル-シクロブトキシ基、2-エチル-シクロブトキシ基、3-エチル-シクロブトキシ基、1,2-ジメチル-シクロブトキシ基、1,3-ジメチル-シクロブトキシ基、2,2-ジメチル-シクロブトキシ基、2,3-ジメチル-シクロブトキシ基、2,4-ジメチル-シクロブトキシ基、3,3-ジメチル-シクロブトキシ基、1-n-プロピル-シクロプロポキシ基、2-n-プロピル-シクロプロポキシ基、1-i-プロピル-シクロプロポキシ基、2-i-プロピル-シクロプロポキシ基、1,2,2-トリメチル-シクロプロポキシ基、1,2,3-トリメチル-シクロプロポキシ基、2,2,3-トリメチル-シクロプロポキシ基、1-エチル-2-メチル-シクロプロポキシ基、2-エチル-1-メチル-シクロプロポキシ基、2-エチル-2-メチル-シクロプロポキシ基及び2-エチル-3-メチル-シクロプロポキシ基等が挙げられる。
アルコキシアリール基の具体例としては、2-メトキシフェニル基、3-メトキシフェニル基、4-メトキシフェニル基、2-(1-エトキシ)フェニル基、3-(1-エトキシ)フェニル基、4-(1-エトキシ)フェニル基、2-(2-エトキシ)フェニル基、3-(2-エトキシ)フェニル基、4-(2-エトキシ)フェニル基、2-メトキシナフタレン-1-イル基、3-メトキシナフタレン-1-イル基、4-メトキシナフタレン-1-イル基、5-メトキシナフタレン-1-イル基、6-メトキシナフタレン-1-イル基、7-メトキシナフタレン-1-イル基等が挙げられるが、これらに限定されない。
アルコキシアラルキル基の具体例としては、3-(メトキシフェニル)ベンジル基、4-(メトキシフェニル)ベンジル基等が挙げられるが、これらに限定されない。
アルケニル基の具体例としては、エテニル基(ビニル基)、1-プロペニル基、2-プロペニル基、1-メチル-1-エテニル基、1-ブテニル基、2-ブテニル基、3-ブテニル基、2-メチル-1-プロペニル基、2-メチル-2-プロペニル基、1-エチルエテニル基、1-メチル-1-プロペニル基、1-メチル-2-プロペニル基、1-ペンテニル基、2-ペンテニル基、3-ペンテニル基、4-ペンテニル基、1-n-プロピルエテニル基、1-メチル-1-ブテニル基、1-メチル-2-ブテニル基、1-メチル-3-ブテニル基、2-エチル-2-プロペニル基、2-メチル-1-ブテニル基、2-メチル-2-ブテニル基、2-メチル-3-ブテニル基、3-メチル-1-ブテニル基、3-メチル-2-ブテニル基、3-メチル-3-ブテニル基、1,1-ジメチル-2-プロペニル基、1-i-プロピルエテニル基、1,2-ジメチル-1-プロペニル基、1,2-ジメチル-2-プロペニル基、1-シクロペンテニル基、2-シクロペンテニル基、3-シクロペンテニル基、1-ヘキセニル基、2-ヘキセニル基、3-ヘキセニル基、4-ヘキセニル基、5-ヘキセニル基、1-メチル-1-ペンテニル基、1-メチル-2-ペンテニル基、1-メチル-3-ペンテニル基、1-メチル-4-ペンテニル基、1-n-ブチルエテニル基、2-メチル-1-ペンテニル基、2-メチル-2-ペンテニル基、2-メチル-3-ペンテニル基、2-メチル-4-ペンテニル基、2-n-プロピル-2-プロペニル基、3-メチル-1-ペンテニル基、3-メチル-2-ペンテニル基、3-メチル-3-ペンテニル基、3-メチル-4-ペンテニル基、3-エチル-3-ブテニル基、4-メチル-1-ペンテニル基、4-メチル-2-ペンテニル基、4-メチル-3-ペンテニル基、4-メチル-4-ペンテニル基、1,1-ジメチル-2-ブテニル基、1,1-ジメチル-3-ブテニル基、1,2-ジメチル-1-ブテニル基、1,2-ジメチル-2-ブテニル基、1,2-ジメチル-3-ブテニル基、1-メチル-2-エチル-2-プロペニル基、1-s-ブチルエテニル基、1,3-ジメチル-1-ブテニル基、1,3-ジメチル-2-ブテニル基、1,3-ジメチル-3-ブテニル基、1-i-ブチルエテニル基、2,2-ジメチル-3-ブテニル基、2,3-ジメチル-1-ブテニル基、2,3-ジメチル-2-ブテニル基、2,3-ジメチル-3-ブテニル基、2-i-プロピル-2-プロペニル基、3,3-ジメチル-1-ブテニル基、1-エチル-1-ブテニル基、1-エチル-2-ブテニル基、1-エチル-3-ブテニル基、1-n-プロピル-1-プロペニル基、1-n-プロピル-2-プロペニル基、2-エチル-1-ブテニル基、2-エチル-2-ブテニル基、2-エチル-3-ブテニル基、1,1,2-トリメチル-2-プロペニル基、1-t-ブチルエテニル基、1-メチル-1-エチル-2-プロペニル基、1-エチル-2-メチル-1-プロペニル基、1-エチル-2-メチル-2-プロペニル基、1-i-プロピル-1-プロペニル基、1-i-プロピル-2-プロペニル基、1-メチル-2-シクロペンテニル基、1-メチル-3-シクロペンテニル基、2-メチル-1-シクロペンテニル基、2-メチル-2-シクロペンテニル基、2-メチル-3-シクロペンテニル基、2-メチル-4-シクロペンテニル基、2-メチル-5-シクロペンテニル基、2-メチレン-シクロペンチル基、3-メチル-1-シクロペンテニル基、3-メチル-2-シクロペンテニル基、3-メチル-3-シクロペンテニル基、3-メチル-4-シクロペンテニル基、3-メチル-5-シクロペンテニル基、3-メチレン-シクロペンチル基、1-シクロヘキセニル基、2-シクロヘキセニル基及び3-シクロヘキセニル基等が挙げられ、またビシクロへプテニル基(ノルボルニル基)等の架橋環式のアルケニル基も挙げることができる。
また置換基において挙げたアリールオキシ基は、アリール基が酸素原子(-O-)を介して結合する基であり、このようなアリール基の具体例としては前述したものと同じものが挙げられる。アリールオキシ基の炭素原子数は、特に限定されるものではないが、好ましくは40以下、より好ましくは30以下、より一層好ましくは20以下であり、その具体例としては、フェノキシ基、ナフタレン-2-イルオキシ基等が挙げられるが、これらに限定されない。
また、置換基が2以上存在する場合、置換基同士が結合して環を形成してもよい。
アクリロイル基を有する有機基としては、アクリロイルオキシメチル基、アクリロイルオキシエチル基、アクリロイルオキシプロピル基等が挙げられる。
メタクリロイル基を有する有機基としては、メタクリロイルオキシメチル基、メタクリロイルオキシエチル基、メタクリロイルオキシプロピル基等が挙げられる。
メルカプト基を有する有機基としては、メルカプトエチル基、メルカプトブチル基、メルカプトヘキシル基、メルカプトオクチル基、メルカプトフェニル基等が挙げられる。
アミノ基を有する有機基としては、アミノ基、アミノメチル基、アミノエチル基、アミノフェニル基、ジメチルアミノエチル基、ジメチルアミノプロピル基等が挙げられるがこれらに限定されない。アミノ基を有する有機基については、更に詳細について後述する。
アルコキシ基を有する有機基としては、例えばメトキシメチル基、メトキシエチル基が挙げられるがこれらに限定されない。ただし、アルコキシ基が直接ケイ素原子に結合する基は除かれる。
スルホニル基を有する有機基としては、例えばスルホニルアルキル基や、スルホニルアリール基が挙げられるがこれらに限定されない。
シアノ基を有する有機基としては、シアノエチル基、シアノプロピル基、シアノフェニル基、チオシアネート基等が挙げられる。
炭化水素基としては、アルキル基、アルケニル基、アリール基等が挙げられるが、これらに限定されない。これらアルキル基、アルケニル基及びアリール基の具体例としては、R2において前述したものと同じものが挙げられる。
またアルキレン基としては、直鎖状でも分岐鎖状でもいずれでもよく、その炭素原子数は、通常1~10、好ましくは1~5である。例えば、メチレン基、エチレン基、トリメチレン基、テトラメチレン基、ペンタメチレン基、ヘキサメチレン基、ヘプタメチレン基、オクタメチレン基、ノナメチレン基、デカメチレン基等の直鎖状アルキレン基が挙げられる。
アミノ基を有する有機基としては、アミノ基、アミノメチル基、アミノエチル基、アミノフェニル基、ジメチルアミノエチル基、ジメチルアミノプロピル基等が挙げられるがこれらに限定されない。
Xにおけるアルコキシ基としては、例えば、R2の説明で例示したアルコキシ基が挙げられる。
Xにおけるハロゲン原子としては、例えば、R2の説明で例示したハロゲン原子が挙げられる。
アラルキルオキシ基の炭素原子数は特に限定されるものではないが、例えば40以下、好ましくは30以下、より好ましくは20以下とすることができる。
アラルキルオキシ基の具体例としては、フェニルメチルオキシ基(ベンジルオキシ基)、2-フェニルエチレンオキシ基、3-フェニル-n-プロピルオキシ基、4-フェニル-n-ブチルオキシ基、5-フェニル-n-ペンチルオキシ基、6-フェニル-n-ヘキシルオキシ基、7-フェニル-n-ヘプチルオキシ基、8-フェニル-n-オクチルオキシ基、9-フェニル-n-ノニルオキシ基、10-フェニル-n-デシルオキシ基等が挙げられるが、これらに限定されない。
アシルオキシ基の具体例としては、炭素原子数2~20のアシルオキシ基が挙げられ、例えばメチルカルボニルオキシ基、エチルカルボニルオキシ基、n-プロピルカルボニルオキシ基、i-プロピルカルボニルオキシ基、n-ブチルカルボニルオキシ基、i-ブチルカルボニルオキシ基、s-ブチルカルボニルオキシ基、t-ブチルカルボニルオキシ基、n-ペンチルカルボニルオキシ基、1-メチル-n-ブチルカルボニルオキシ基、2-メチル-n-ブチルカルボニルオキシ基、3-メチル-n-ブチルカルボニルオキシ基、1,1-ジメチル-n-プロピルカルボニルオキシ基、1,2-ジメチル-n-プロピルカルボニルオキシ基、2,2-ジメチル-n-プロピルカルボニルオキシ基、1-エチル-n-プロピルカルボニルオキシ基、n-ヘキシルカルボニルオキシ基、1-メチル-n-ペンチルカルボニルオキシ基、2-メチル-n-ペンチルカルボニルオキシ基、3-メチル-n-ペンチルカルボニルオキシ基、4-メチル-n-ペンチルカルボニルオキシ基、1,1-ジメチル-n-ブチルカルボニルオキシ基、1,2-ジメチル-n-ブチルカルボニルオキシ基、1,3-ジメチル-n-ブチルカルボニルオキシ基、2,2-ジメチル-n-ブチルカルボニルオキシ基、2,3-ジメチル-n-ブチルカルボニルオキシ基、3,3-ジメチル-n-ブチルカルボニルオキシ基、1-エチル-n-ブチルカルボニルオキシ基、2-エチル-n-ブチルカルボニルオキシ基、1,1,2-トリメチル-n-プロピルカルボニルオキシ基、1,2,2-トリメチル-n-プロピルカルボニルオキシ基、1-エチル-1-メチル-n-プロピルカルボニルオキシ基、1-エチル-2-メチル-n-プロピルカルボニルオキシ基、フェニルカルボニルオキシ基、及びトシルカルボニルオキシ基等が挙げられる。
[A]成分としてのポリシロキサンは、特定基を有する加水分解性シラン(A)由来の構成単位を含み、かつシロキサン結合を有するポリマーである限り特に限定されない。
[A’]成分としてのポリシロキサンは、シロキサン結合を有するポリマーである限り特に限定されない。[A’]成分としてのポリシロキサンは、[A]成分としてのポリシロキサンであってもよい。
またポリシロキサンは、一例として加水分解性シランの加水分解縮合物であってもよいし、加水分解縮合物が有するシラノール基の少なくとも一部がアルコール変性された又はアセタール保護された変性物(以下、「加水分解縮合物の変性物」と称することがある。)であってもよい。加水分解縮合物に係る加水分解性シランは、一種又は二種以上の加水分解性シランを含むことができる。
また[A]成分又は[A’]成分としてのポリシロキサンは、かご型、ラダー型、直鎖型、及び分岐型のいずれの主鎖を有する構造であるものとすることができる。さらに[A’]成分としてのポリシロキサンとして、市販のポリシロキサンを使用することができる。
なお、本明細書において、「加水分解性シラン」を単に「シラン化合物」とも称することがある。
[A’]成分としてのポリシロキサンとして、例えば下記式(1)で表される少なくとも1種の加水分解性シランを含む加水分解性シランの加水分解縮合物又はその変性物を挙げることができる。
またR2は、ケイ素原子に結合する基又は原子であって、互いに独立して、アルコキシ基、アラルキルオキシ基、アシルオキシ基、又はハロゲン原子を表す。
aは0~3の整数を表す。
式(1)中のR2における各基及び原子の具体例、並びにそれらの好適な炭素原子数としては、式(A-1)中のXについて前述した基及び原子並びに炭素原子数を挙げることができる。
式(1)で表される加水分解性シランの具体例としては、テトラメトキシシラン、テトラクロロシラン、テトラアセトキシシラン、テトラエトキシシラン、テトラ-n-プロポキシシラン、テトラ-i-プロポキシシラン、テトラ-n-ブトキシシラン、メチルトリメトキシシラン、メチルトリクロロシラン、メチルトリアセトキシシラン、メチルトリエトキシシラン、メチルトリプロポキシシラン、メチルトリブトキシシラン、メチルトリアミロキシシラン、メチルトリフェノキシシラン、メチルトリベンジルオキシシラン、メチルトリフェネチルオキシシラン、グリシドキシメチルトリメトキシシラン、グリシドキシメチルトリエトキシシラン、α-グリシドキシエチルトリメトキシシラン、α-グリシドキシエチルトリエトキシシラン、β-グリシドキシエチルトリメトキシシラン、β-グリシドキシエチルトリエトキシシラン、α-グリシドキシプロピルトリメトキシシラン、α-グリシドキシプロピルトリエトキシシラン、β-グリシドキシプロピルトリメトキシシラン、β-グリシドキシプロピルトリエトキシシラン、γ-グリシドキシプロピルトリメトキシシラン、γ-グリシドキシプロピルトリエトキシシラン、γ-グリシドキシプロピルトリプロポキシシラン、γ-グリシドキシプロピルトリブトキシシラン、γ-グリシドキシプロピルトリフェノキシシラン、α-グリシドキシブチルトリメトキシシラン、α-グリシドキシブチルトリエトキシシラン、β-グリシドキシブチルトリエトキシシラン、γ-グリシドキシブチルトリメトキシシラン、γ-グリシドキシブチルトリエトキシシラン、δ-グリシドキシブチルトリメトキシシラン、δ-グリシドキシブチルトリエトキシシラン、(3,4-エポキシシクロヘキシル)メチルトリメトキシシラン、(3,4-エポキシシクロヘキシル)メチルトリエトキシシラン、β-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン、β-(3,4-エポキシシクロヘキシル)エチルトリエトキシシラン、β-(3,4-エポキシシクロヘキシル)エチルトリプロポキシシラン、β-(3,4-エポキシシクロヘキシル)エチルトリブトキシシラン、β-(3,4-エポキシシクロヘキシル)エチルトリフェノキシシラン、γ-(3,4-エポキシシクロヘキシル)プロピルトリメトキシシラン、γ-(3,4-エポキシシクロヘキシル)プロピルトリエトキシシラン、δ-(3,4-エポキシシクロヘキシル)ブチルトリメトキシシラン、δ-(3,4-エポキシシクロヘキシル)ブチルトリエトキシシラン、グリシドキシメチルメチルジメトキシシラン、グリシドキシメチルメチルジエトキシシラン、α-グリシドキシエチルメチルジメトキシシラン、α-グリシドキシエチルメチルジエトキシシラン、β-グリシドキシエチルメチルジメトキシシラン、β-グリシドキシエチルエチルジメトキシシラン、α-グリシドキシプロピルメチルジメトキシシラン、α-グリシドキシプロピルメチルジエトキシシラン、β-グリシドキシプロピルメチルジメトキシシラン、β-グリシドキシプロピルエチルジメトキシシラン、γ-グリシドキシプロピルメチルジメトキシシラン、γ-グリシドキシプロピルメチルジエトキシシラン、γ-グリシドキシプロピルメチルジプロポキシシラン、γ-グリシドキシプロピルメチルジブトキシシラン、γ-グリシドキシプロピルメチルジフェノキシシラン、γ-グリシドキシプロピルエチルジメトキシシラン、γ-グリシドキシプロピルエチルジエトキシシラン、γ-グリシドキシプロピルビニルジメトキシシラン、γ-グリシドキシプロピルビニルジエトキシシラン、エチルトリメトキシシラン、エチルトリエトキシシラン、ビニルトリメトキシシラン、ビニルトリエトキシシラン、ビニルトリクロロシラン、ビニルトリアセトキシシラン、メチルビニルジメトキシシラン、メチルビニルジエトキシシラン、メチルビニルジクロロシラン、メチルビニルジアセトキシシラン、ジメチルビニルメトキシシラン、ジメチルビニルエトキシシラン、ジメチルビニルクロロシラン、ジメチルビニルアセトキシシラン、ジビニルジメトキシシラン、ジビニルジエトキシシラン、ジビニルジクロロシラン、ジビニルジアセトキシシラン、γ-グリシドキシプロピルビニルジメトキシシラン、γ-グリシドキシプロピルビニルジエトキシシラン、アリルトリメトキシシラン、アリルトリエトキシシラン、アリルトリクロロシラン、アリルトリアセトキシシシラン、アリルメチルジメトキシシラン、アリルメチルジエトキシシラン、アリルメチルジクロロシラン、アリルメチルジアセトキシシラン、アリルジメチルメトキシシラン、アリルジメチルエトキシシラン、アリルジメチルクロロシラン、アリルジメチルアセトキシシラン、ジアリルジメトキシシラン、ジアリルジエトキシシラン、ジアリルジクロロシラン、ジアリルジアセトキシシラン、3-アリルアミノプロピルトリメトキシシラン、3-アリルアミノプロピルトリエトキシシラン、p-スチリルトリメトキシシラン、フェニルトリメトキシシラン、フェニルトリエトキシシラン、フェニルトリクロロシラン、フェニルトリアセトキシシラン、フェニルメチルジメトキシシラン、フェニルメチルジエトキシシラン、フェニルメチルジクロロシラン、フェニルメチルジアセトキシシラン、フェニルジメチルメトキシシラン、フェニルジメチルエトキシシラン、フェニルジメチルクロロシラン、フェニルジメチルアセトキシシラン、ジフェニルメチルメトキシシラン、ジフェニルメチルエトキシシラン、ジフェニルメチルクロロシラン、ジフェニルメチルアセトキシシラン、ジフェニルジメトキシシラン、ジフェニルジエトキシシラン、ジフェニルジクロロシラン、ジフェニルジアセトキシシラン、トリフェニルメトキシシシラン、トリフェニルエトキシシラン、トリフェニルアセトキシシラン、トリフェニルクロロシラン、3-フェニルアミノプロピルトリメトキシシラン、3-フェニルアミノプロピルトリエトキシシラン、ジメトキシメチル-3-(3-フェノキシプロピルチオプロピル)シラン、トリエトキシ((2-メトキシ-4-(メトキシメチル)フェノキシ)メチル)シラン、ベンジルトリメトキシシラン、ベンジルトリエトキシシラン、ベンジルメチルジメトキシシラン、ベンジルメチルジエトキシシラン、ベンジルジメチルメトキシシラン、ベンジルジメチルエトキシシラン、ベンジルジメチルクロロシラン、フェネチルトリメトキシシラン、フェネチルトリエトキシシラン、フェネチルトリクロロシラン、フェネチルトリアセトキシシラン、フェネチルメチルジメトキシシラン、フェネチルメチルジエトキシシラン、フェネチルメチルジクロロシラン、フェネチルメチルジアセトキシシラン、メトキシフェニルトリメトキシシラン、メトキシフェニルトリエトキシシラン、メトキシフェニルトリアセトキシシラン、メトキシフェニルトリクロロシラン、メトキシベンジルトリメトキシシラン、メトキシベンジルトリエトキシシラン、メトキシベンジルトリアセトキシシラン、メトキシベンジルトリクロロシラン、メトキシフェネチルトリメトキシシラン、メトキシフェネチルトリエトキシシラン、メトキシフェネチルトリアセトキシシラン、メトキシフェネチルトリクロロシラン、エトキシフェニルトリメトキシシラン、エトキシフェニルトリエトキシシラン、エトキシフェニルトリアセトキシシラン、エトキシフェニルトリクロロシラン、エトキシベンジルトリメトキシシラン、エトキシベンジルトリエトキシシラン、エトキシベンジルトリアセトキシシラン、エトキシベンジルトリクロロシラン、i-プロポキシフェニルトリメトキシシラン、i-プロポキシフェニルトリエトキシシラン、i-プロポキシフェニルトリアセトキシシラン、i-プロポキシフェニルトリクロロシラン、i-プロポキシベンジルトリメトキシシラン、i-プロポキシベンジルトリエトキシシラン、i-プロポキシベンジルトリアセトキシシラン、i-プロポキシベンジルトリクロロシラン、t-ブトキシフェニルトリメトキシシラン、t-ブトキシフェニルトリエトキシシラン、t-ブトキシフェニルトリアセトキシシラン、t-ブトキシフェニルトリクロロシラン、t-ブトキシベンジルトリメトキシシラン、t-ブトキシベンジルトリエトキシシラン、t-ブトキシベンジルトリアセトキシシラン、t-ブトキシシベンジルトリクロロシラン、メトキシナフチルトリメトキシシラン、メトキシナフチルトリエトキシシラン、メトキシナフチルトリアセトキシシラン、メトキシナフチルトリクロロシラン、エトキシナフチルトリメトキシシラン、エトキシナフチルトリエトキシシラン、エトキシナフチルトリアセトキシシラン、エトキシナフチルトリクロロシラン、γ-クロロプロピルトリメトキシシラン、γ-クロロプロピルトリエトキシシラン、γ-クロロプロピルトリアセトキシシラン、3,3,3-トリフルオロプロピルトリメトキシシラン、γ-メタクリルオキシプロピルトリメトキシシラン、γ-メルカプトプロピルトリメトキシシラン、γ-メルカプトプロピルトリエトキシシラン、β-シアノエチルトリエトキシシラン、チオシアネートプロピルトリエトキシシラン、クロロメチルトリメトキシシラン、クロロメチルトリエトキシシラン、トリエトキシシリルプロピルジアリルイソシアヌレート、ビシクロ[2,2,1]ヘプテニルトリエトキシシラン、ベンゼンスルホニルプロピルトリエトキシシラン、ベンゼンスルホンアミドプロピルトリエトキシシラン、ジメチルアミノプロピルトリメトキシシラン、ジメチルジメトキシシラン、フェニルメチルジメトキシシラン、ジメチルジエトキシシラン、フェニルメチルジエトキシシラン、γ-クロロプロピルメチルジメトキシシラン、γ-クロロプロピルメチルジエトキシシラン、ジメチルジアセトキシシラン、γ-メタクリルオキシプロピルメチルジメトキシシラン、γ-メタクリルオキシプロピルメチルジエトキシシラン、γ-メルカプトプロピルメチルジメトキシシラン、γ-メルカプトメチルジエトキシシラン、メチルビニルジメトキシシラン、メチルビニルジエトキシシランや、下記式(A-1)~(A-41)で表されるシラン、下記式(1-1)~(1-225)、及び(1-246)~(1-290)で表されるシラン等が挙げられるが、これらに限定されない。
また[A]ポリシロキサンとして、特定基を有する加水分解性シラン(A)、式(1)で表される加水分解性シラン、及び下記式(2)で表される加水分解性シランを含む、加水分解性シランの加水分解縮合物又はその変性物を挙げることができる。
[A’]ポリシロキサンとして、式(1)で表される加水分解性シランとともに、あるいは式(1)で表される加水分解性シランの代わりに、下記式(2)で表される加水分解性シランを含む、加水分解性シランの加水分解縮合物又はその変性物を挙げることができる。
またR4は、ケイ素原子に結合する基又は原子であって、互いに独立して、アルコキシ基、アラルキルオキシ基、アシルオキシ基、又はハロゲン原子を表す。
R5は、ケイ素原子に結合する基であって、互いに独立して、アルキレン基又はアリーレン基を表す。
bは、0又は1を表し、cは、0又は1を表す。
R4における各基及び原子の具体例、並びにそれらの好適な炭素原子数としては、式(A-1)中のXについて前述した基及び原子並びに炭素原子数を挙げることができる。
R5におけるアルキレン基の具体例としては、メチレン基、エチレン基、トリメチレン基、テトラメチレン基、ペンタメチレン基、ヘキサメチレン基、ヘプタメチレン基、オクタメチレン基、ノナメチレン基、デカメチレン基等の直鎖状アルキレン基、1-メチルトリメチレン基、2-メチルトリメチレン基、1,1-ジメチルエチレン基、1-メチルテトラメチレン基、2-メチルテトラメチレン基、1,1-ジメチルトリメチレン基、1,2-ジメチルトリメチレン基、2,2-ジメチルトリメチレン基、1-エチルトリメチレン基等の分岐鎖状アルキレン基等のアルキレン基、メタントリイル基、エタン-1,1,2-トリイル基、エタン-1,2,2-トリイル基、エタン-2,2,2-トリイル基、プロパン-1,1,1-トリイル基、プロパン-1,1,2-トリイル基、プロパン-1,2,3-トリイル基、プロパン-1,2,2-トリイル基、プロパン-1,1,3-トリイル基、ブタン-1,1,1-トリイル基、ブタン-1,1,2-トリイル基、ブタン-1,1,3-トリイル基、ブタン-1,2,3-トリイル基、ブタン-1,2,4-トリイル基、ブタン-1,2,2-トリイル基、ブタン-2,2,3-トリイル基、2-メチルプロパン-1,1,1-トリイル基、2-メチルプロパン-1,1,2-トリイル基、2-メチルプロパン-1,1,3-トリイル基のアルカントリイル基等が挙げられるが、これらに限定されない。
R5におけるアリーレン基の具体例としては、1,2-フェニレン基、1,3-フェニレン基、1,4-フェニレン基;1,5-ナフタレンジイル基、1,8-ナフタレンジイル基、2,6-ナフタレンジイル基、2,7-ナフタレンジイル基、1,2-アントラセンジイル基、1,3-アントラセンジイル基、1,4-アントラセンジイル基、1,5-アントラセンジイル基、1,6-アントラセンジイル基、1,7-アントラセンジイル基、1,8-アントラセンジイル基、2,3-アントラセンジイル基、2,6-アントラセンジイル基、2,7-アントラセンジイル基、2,9-アントラセンジイル基、2,10-アントラセンジイル基、9,10-アントラセンジイル基等の縮合環芳香族炭化水素化合物の芳香環上の水素原子を二つ取り除いて誘導される基;4,4’-ビフェニルジイル基、4,4’’-パラテルフェニルジイル基の環連結芳香族炭化水素化合物の芳香環上の水素原子を二つ取り除いて誘導される基等が挙げられるが、これらに限定されない。
bは、好ましく0である。
cは、好ましくは1である。
[A’]ポリシロキサンとして、式(1)で表される加水分解性シラン及び/又は式(2)で表される加水分解性シランとともに、下記に挙げるその他の加水分解性シランを含む、加水分解性シランの加水分解縮合物又はその変性物を挙げることができる。
その他の加水分解性シランとして、オニウム基を分子内に有するシラン化合物、環状尿素骨格を分子内に有するシラン化合物等が挙げられるが、これらに限定されない。
オニウム基を分子内に有するシラン化合物は、加水分解性シランの架橋反応を効果的に且つ効率的に促進できることが期待される。
R12は、ケイ素原子に結合する基であって、互いに独立して、置換されていてもよいアルキル基、置換されていてもよいアリール基(ただし、フェナントリル基を除く。)、置換されていてもよいアラルキル基、置換されていてもよいハロゲン化アルキル基、置換されていてもよいハロゲン化アリール基、置換されていてもよいハロゲン化アラルキル基、置換されていてもよいアルコキシアルキル基、置換されていてもよいアルコキシアリール基、置換されていてもよいアルコキシアラルキル基、若しくは置換されていてもよいアルケニル基を表すか、又はエポキシ基を有する有機基、アクリロイル基を有する有機基、メタクリロイル基を有する有機基、メルカプト基を有する有機基、アミノ基を有する有機基、若しくはシアノ基を有する有機基、又はそれらの2種以上の組み合わせを表す。
R13は、ケイ素原子に結合する基又は原子であって、互いに独立して、アルコキシ基、アラルキルオキシ基、アシルオキシ基、又はハロゲン原子を表す。
fは1又は2を表し、gは0又は1を表し、1≦f+g≦2を満たす。
すなわち、オニウム基又はそれを有する有機基の好適な具体例としては、環状アンモニウム基若しくは鎖状アンモニウム基又はこれらの少なくとも一方を有する有機基が挙げられ、第3級アンモニウム基若しくは第4級アンモニウム基又はこれらの少なくとも一方を有する有機基が好ましい。
なお、オニウム基が環状アンモニウム基である場合、アンモニウム基を構成する窒素原子が環を構成する原子を兼ねる。この際、環を構成する窒素原子とシリコン原子とが直接又は2価の連結基を介して結合している場合と、環を構成する炭素原子とシリコン原子が直接に又は2価の連結基を介して結合している場合とがある。
このようなアルキル基、アリール基、アラルキル基、ハロゲン化アルキル基、ハロゲン化アリール基、ハロゲン化アラルキル基及びアルケニル基の具体例及びそれらの好適な炭素原子数としては、前述と同じものが挙げられる。
m1が0である場合、A1~A4を含む(4+n1)員環が構成される。すなわち、n1が1であるときは5員環、n1が2であるときは6員環、n1が3であるときは7員環、n1が4であるときは8員環、n1が5であるときは9員環、n1が6であるときは10員環、n1が7であるときは11員環、n1が8であるときは12員環が、それぞれ構成される。
m1が1である場合、A1~A3を含む(4+n1)員環とA4を含む6員環とが縮合した縮合環が形成される。
A1~A4は、式(J1)~式(J3)のいずれであるか次第で、環を構成する原子上に水素原子を有する場合と、水素原子を有さない場合があるが、A1~A4が、環を構成する原子上に水素原子を有する場合、その水素原子は、R14に置き換わっていてもよい。また、A1~A4中の環構成原子以外の環構成原子に、R14が置換していてもよい。このような事情から、前述の通り、m2は、0又は1から単環若しくは多環に置換可能な最大数までの整数から選択される。
このような連結基としては、アルキレン基、アリーレン基、アルケニレン基等が挙げられるが、これらに限定されない。
アルキレン基及びアリーレン基の具体例及びそれらの好適な炭素原子数としては、前述したものと同じものが挙げられる。
その具体例としては、ビニレン、1-メチルビニレン、プロペニレン、1-ブテニレン、2-ブテニレン、1-ペンテニレン、2-ペンテニレン基等が挙げられるが、これらに限定されない。
アルキル基、アリール基、アラルキル基、ハロゲン化アルキル基、ハロゲン化アリール基、ハロゲン化アラルキル基及びアルケニル基の具体例及びそれらの好適な炭素原子数としては、前述したものと同じものが挙げられる。
m3が0である場合、A5~A8を含む(4+n2)員環が構成される。すなわち、n2が1であるときは5員環、n2が2であるときは6員環、n2が3であるときは7員環、n2が4であるときは8員環、n2が5であるときは9員環、n2が6であるときは10員環、n2が7であるときは11員環、n2が8であるときは12員環が、それぞれ構成される。
m3が1である場合、A5~A7を含む(4+n2)員環とA8を含む6員環とが縮合した縮合環が形成される。
A5~A8は、式(J4)~式(J6)のいずれであるか次第で、環を構成する原子上に水素原子を有する場合と、水素原子を有さない場合があるが、A5~A8が、環を構成する原子上に水素原子を有する場合、その水素原子は、R15に置き換わっていてもよい。また、A5~A8中の環構成原子以外の環構成原子に、R15が置換していてもよい。
このような事情から、前述の通り、m4は、0又は1から単環若しくは多環に置換可能な最大数までの整数から選択される。
このような連結基としては、アルキレン基、アリーレン基又はアルケニレン基が挙げられ、アルキレン基、アリーレン基及びアルケニレン基の具体例及びそれらの好適な炭素原子数としては、前述と同じものが挙げられる。
このような連結基としては、アルキレン基、アリーレン基又はアルケニレン基が挙げられ、アルキレン基、アリーレン基及びアルケニレン基の具体例としては、前述と同じものが挙げられる。
環状尿素骨格を分子内に有する加水分解性オルガノシランとして、例えば下記式(4-1)で表される加水分解性オルガノシランが挙げられる。
R402は、ケイ素原子に結合する基であり、置換されていてもよいアルキル基、置換されていてもよいアリール基(ただし、フェナントリル基を除く。)、置換されていてもよいアラルキル基、置換されていてもよいハロゲン化アルキル基、置換されていてもよいハロゲン化アリール基、置換されていてもよいハロゲン化アラルキル基、置換されていてもよいアルコキシアルキル基、置換されていてもよいアルコキシアリール基、置換されていてもよいアルコキシアラルキル基、若しくは置換されていてもよいアルケニル基を表すか、又はエポキシ基を有する有機基、アクリロイル基を有する有機基、メタクリロイル基を有する有機基、メルカプト基を有する有機基若しくはシアノ基を有する有機基、又はそれらの2種以上の組み合わせを表す。
R403は、ケイ素原子に結合する基又は原子であり、互いに独立して、アルコキシ基、アラルキルオキシ基、アシルオキシ基又はハロゲン原子を表す。
xは、1又は2であり、yは、0又は1であり、x+y≦2を満たす。
R402のアルキル基、アリール基、アラルキル基、ハロゲン化アルキル基、ハロゲン化アリール基、ハロゲン化アラルキル基、アルコキシアルキル基、アルコキシアリール基、アルコキシアラルキル基、アルケニル基、及び、エポキシ基を有する有機基、アクリロイル基を有する有機基、メタクリロイル基を有する有機基、メルカプト基を有する有機基及びシアノ基を有する有機基、並びに、R403のアルコキシ基、アラルキルオキシ基、アシルオキシ基及びハロゲン原子、並びにこれらの置換基の具体例、好適な炭素原子数等は、式(A-1)中のR2及びXに関し前述したものと同じものが挙げられる。
なお、R404の置換されていてもよいアルキル基、置換されていてもよいアルケニル基及びエポキシ基を有する有機基の具体例及び好適な炭素原子数等は、式(A-1)中のR2に関し前述したものと同じものが挙げられるが、これらの他、R404の置換されていてもよいアルキル基としては、末端の水素原子がビニル基で置換されたアルキル基が好ましく、その具体例としては、アリル基、2-ビニルエチル基、3-ビニルプロピル基、4-ビニルブチル基等が挙げられる。
これらの基におけるアルキル基、アリール基、アラルキル基、ハロゲン化アルキル基、ハロゲン化アリール基、ハロゲン化アラルキル基、アルコキシアルキル基、アルコキシアリール基、アルコキシアラルキル基、及びアルケニル基、並びにそれらの置換基の具体例及び好適な炭素原子数等は、式(A-1)中のR2に関し前述したものと同じものが挙げられる。
アルキレン基の具体例としては、メチレン基、エチレン基、トリメチレン基、テトラメチレン基、ペンタメチレン基、ヘキサメチレン基、ヘプタメチレン基、オクタメチレン基、ノナメチレン基、デカメチレン基等の直鎖状アルキレン基、メチルエチレン基、1-メチルトリメチレン基、2-メチルトリメチレン基、1,1-ジメチルエチレン基、1-メチルテトラメチレン基、2-メチルテトラメチレン基、1,1-ジメチルトリメチレン基、1,2-ジメチルトリメチレン基、2,2-ジメチルトリメチレン基、1-エチルトリメチレン基等の分岐鎖状アルキレン基、1,2-シクロプロパンジイル基、1,2-シクロブタンジイル基、1,3-シクロブチタンジイル基、1,2-シクロヘキサンジイル、1,3-シクロヘキサンジイル基等の環状アルキレン等、-CH2OCH2-、-CH2CH2OCH2-、-CH2CH2OCH2CH2-、-CH2CH2CH2OCH2CH2-、-CH2CH2OCH2CH2CH2-、-CH2CH2CH2OCH2CH2CH2-、-CH2SCH2-、-CH2CH2SCH2-、-CH2CH2SCH2CH2-、-CH2CH2CH2SCH2CH2-、-CH2CH2SCH2CH2CH2-、-CH2CH2CH2SCH2CH2CH2-、-CH2OCH2CH2SCH2-等のエーテル基等を含むアルキレン基が挙げられるが、これらに限定されない。
中でも、優れたリソグラフィー特性を再現性よく実現する観点から、X401は式(4-5)で表される基が好ましい。
該変性物であるポリシロキサンは、前述の加水分解性シランの加水分解縮合物において、該縮合物が有するシラノール基の少なくとも一部とアルコールのヒドロキシ基との反応により得られる反応生成物、該縮合物とアルコールとの脱水反応物、また、該縮合物が有するシラノール基の少なくとも一部をアセタール基で保護した変性物等を挙げることができる。
また例えば3-メトキシブタノール、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、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、プロピレングリコールモノメチルエーテル(1-メトキシ-2-プロパノール)、プロピレングリコールモノエチルエーテル(1-エトキシ-2-プロパノール)、プロピレングリコールモノブチルエーテル(1-ブトキシ-2-プロパノール)等のアルコキシ基含有アルコールを用いることができる。
酸は、酸解離定数(pka)が-1~5、好ましくは4~5である有機酸を用いることができる。例えば、酸は、トリフルオロ酢酸、マレイン酸、安息香酸、イソ酪酸、酢酸等、中でも安息香酸、イソ酪酸、酢酸等を例示することができる。
また、酸は、70~160℃の沸点を有する酸を用いることができ、例えば、トリフルオロ酢酸、イソ酪酸、酢酸、硝酸等が挙げられる。
このように酸としては、酸解離定数(pka)が4~5であるか、又は沸点が70~160℃であるか、いずれかの物性を有するものが好ましい。即ち、酸性度が弱いものか、又は酸性度は強くても沸点が低いものを用いることができる。
そして、酸としては酸解離定数、沸点の性質からいずれの性質を利用することも可能である。
なお、重量平均分子量は、GPC分析によるポリスチレン換算にて得られる分子量である。GPC分析は、例えばGPC装置(商品名HLC-8220GPC、東ソー株式会社製)、GPCカラム(商品名Shodex(登録商標)KF803L、KF802、KF801、昭和電工株式会社製)、カラム温度を40℃とし、溶離液(溶出溶媒)としてテトラヒドロフランを用い、流量(流速)は1.0mL/minとし、標準試料はポリスチレン(昭和電工株式会社製Shodex(登録商標))を用いて行うことができる。
前述のシラン化合物(加水分解性シラン)は、ケイ素原子に直接結合するアルコキシ基、アラルキルオキシ基、アシルオキシ基、又はハロゲン原子を、すなわちアルコキシシリル基、アラルキルオキシシリル基、アシロキシシリル基、又はハロゲン化シリル基(以下、加水分解性基と称する)を含む。
これら加水分解性基の加水分解には、加水分解性基の1モル当たり、通常0.1~100モル、例えば0.5~100モル、好ましくは1~10モルの水を用いる。
加水分解及び縮合の際、反応を促進する目的等で、加水分解触媒を用いてもよいし、用いずに加水分解及び縮合を行ってもよい。加水分解触媒を用いる場合は、加水分解性基の1モル当たり、通常0.0001~10モル、好ましくは0.001~1モルの加水分解触媒を用いることができる。
加水分解と縮合を行う際の反応温度は、通常、室温以上、加水分解に用いられ得る有機溶媒の常圧での還流温度以下の範囲であり、例えば20~110℃、また例えば20~80℃とすることができる。
加水分解は完全に加水分解を行う、すなわち、全ての加水分解性基をシラノール基に変えてもよいし、部分加水分解する、即ち未反応の加水分解基を残してもよい。
加水分解し縮合させる際に使用可能な加水分解触媒としては、金属キレート化合物、有機酸、無機酸、有機塩基、無機塩基を挙げることができる。
また、前述の通り、硝酸は、加水分解縮合物の変性物を得る際、例えばシラノール基のアルコールによるキャッピングの際にも使用し得るため、加水分解性シランの加水分解及び縮合と、加水分解縮合物のアルコールキャッピングの双方の反応に寄与できるものとなり得る観点からも好ましい。
得られたポリシロキサンワニスは溶媒置換してもよいし、また適宜溶媒で希釈してもよい。なお得られたポリシロキサンワニスは、その保存安定性が悪くなければ、有機溶媒を留去し、膜形成成分濃度100%とすることもできる。なお膜形成成分とは、組成物の全成分から溶媒成分を除いた成分を指す。
ポリシロキサンワニスの溶媒置換や希釈等に用いる有機溶媒は、加水分解性シランの加水分解及び縮合反応に用いた有機溶媒と同じでも異なってもよい。この希釈用溶媒は、特に限定されず、1種でも2種以上でも任意に選択して用いることができる。
第1の実施形態において、[C]成分としての溶媒は、[A]成分、及び必要に応じてシリコン含有レジスト下層膜形成用組成物に含有されるその他成分を溶解・混和できる溶媒であれば特に制限なく使用することができる。
第2の実施形態において、[C]成分としての溶媒は、[A’]成分、及び[B]成分、並びに必要に応じてシリコン含有レジスト下層膜形成用組成物に含有されるその他成分を溶解・混和できる溶媒であれば特に制限なく使用することができる。
アルキレングリコールモノアルキルエーテルとしては、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プロピルエーテル、エチレングリコールモノブチルエーテル、プロピレングリコールモノメチルエーテル(1-メトキシ-2-プロパノール)、プロピレングリコールモノエチルエーテル(1-エトキシ-2-プロパノール)、メチルイソブチルカルビノール、プロピレングリコールモノブチルエーテル等が挙げられる。
シリコン含有レジスト下層膜形成用組成物は、硬化触媒を含有しない組成物とすることができるが、硬化触媒([D]成分)を含有することが好ましい。
第2の実施形態であるシリコン含有レジスト下層膜形成用組成物における[D]硬化触媒の含有量は、本発明の効果をより十分に得る観点から、[A’]ポリシロキサン100質量部に対して、好ましくは0.1~30質量部、より好ましくは0.5~25質量部、より一層好ましくは1~20質量部である。
シリコン含有レジスト下層膜形成用組成物は、好ましくは[E]硝酸を含有する。
[E]硝酸は、シリコン含有レジスト下層膜形成用組成物の調製時に添加してもよいが、前述のポリシロキサンの製造において、加水分解触媒としてやシラノール基のアルコールキャッピング時に使用し、これがポリシロキサンワニス中に残存したものを[E]硝酸として扱うこともできる。
シリコン含有レジスト下層膜形成用組成物には、組成物の用途に応じて種々の添加剤を配合可能である。
添加剤としては、例えば、架橋剤、架橋触媒、安定化剤(有機酸、水、アルコール等)、有機ポリマー、酸発生剤、界面活性剤(ノニオン系界面活性剤、アニオン系界面活性剤、カチオン系界面活性剤、シリコン系界面活性剤、フッ素系界面活性剤、UV硬化型界面活性剤等)、pH調整剤、金属酸化物、レオロジー調整剤、接着補助剤等、レジスト下層膜や、反射防止膜、パターン反転用膜など、半導体装置の製造に使用され得る各種膜を形成する材料(組成物)に配合される公知の添加剤を挙げることができる。
なお以下に各種添加剤を例示するが、これらに限定されるものではない。
安定化剤は、加水分解性シランの加水分解縮合物の安定化等の目的のために添加され得、その具体例として、有機酸、水、アルコール、又はそれらの組み合わせを添加することができる。
有機酸としては、例えばシュウ酸、マロン酸、メチルマロン酸、コハク酸、マレイン酸、リンゴ酸、酒石酸、フタル酸、クエン酸、グルタル酸、乳酸、サリチル酸等が挙げられる。中でも、シュウ酸、マレイン酸が好ましい。有機酸を添加する場合、その添加量は、加水分解性シランの加水分解縮合物の質量に対して、0.1~5.0質量%である。これら有機酸はpH調整剤としても働き得る。
水としては、純水、超純水、イオン交換水等を用いることができ、使用する場合、その添加量は、シリコン含有レジスト下層膜形成用組成物100質量部に対して1~20質量部とすることができる。
アルコールとしては塗布後の加熱により飛散しやすいものが好ましく、例えばメタノール、エタノール、プロパノール、i-プロパノール、ブタノール等が挙げられる。アルコールを添加する場合、その添加量は、シリコン含有レジスト下層膜形成用組成物100質量部に対して1~20質量部とすることができる。
有機ポリマーは、シリコン含有レジスト下層膜形成用組成物に添加することにより、組成物から形成される膜(レジスト下層膜)のドライエッチング速度(単位時間当たりの膜厚の減少量)や、また減衰係数や屈折率等を調整することができる。有機ポリマーとしては特に制限はなく、その添加目的に応じて、種々の有機ポリマー(縮重合ポリマー及び付加重合ポリマー)の中から適宜選択される。
その具体例としては、ポリエステル、ポリスチレン、ポリイミド、アクリルポリマー、メタクリルポリマー、ポリビニルエーテル、フェノールノボラック、ナフトールノボラック、ポリエーテル、ポリアミド、ポリカーボネート等の付加重合ポリマー及び縮重合ポリマーが挙げられる。
本発明においては、吸光部位として機能するベンゼン環、ナフタレン環、アントラセン環、トリアジン環、キノリン環、キノキサリン環等の芳香環や複素芳香環を含む有機ポリマーも、そのような機能が必要な場合には、好適に用い得る。そのような有機ポリマーの具体例としては、ベンジルアクリレート、ベンジルメタクリレート、フェニルアクリレート、ナフチルアクリレート、アントリルメタクリレート、アントリルメチルメタクリレート、スチレン、ヒドロキシスチレン、ベンジルビニルエーテル及びN-フェニルマレイミド等の付加重合性モノマーをその構造単位として含む付加重合ポリマーや、フェノールノボラック及びナフトールノボラック等の縮重合ポリマーが挙げられるが、これらに限定されない。
付加重合ポリマーの製造には付加重合性モノマーが使用されるが、そのような付加重合性モノマーの具体例としては、アクリル酸、メタクリル酸、アクリル酸エステル化合物、メタクリル酸エステル化合物、アクリルアミド化合物、メタクリルアミド化合物、ビニル化合物、スチレン化合物、マレイミド化合物、マレイン酸無水物、アクリロニトリル等が挙げられるが、これらに限定されない。
有機ポリマーがヒドロキシ基を含む場合は、このヒドロキシ基は、加水分解縮合物等と架橋反応をし得る。
このような有機ポリマーは、1種単独で使用してもよいし、2種以上組み合わせて用いることができる。
酸発生剤としては、熱酸発生剤や光酸発生剤が挙げられ、光酸発生剤を好ましく用いることができる。
光酸発生剤としては、オニウム塩化合物、スルホンイミド化合物、ジスルホニルジアゾメタン化合物等が挙げられるが、これらに限定されない。なお光酸発生剤は、例えば後述するオニウム塩化合物における硝酸塩やマレイン酸塩などのカルボン酸塩、また塩酸塩など、その種類によっては硬化触媒としても機能し得る。
また熱酸発生剤としては、例えばテトラメチルアンモニウム硝酸塩などが挙げられるが、これに限定されない。
なお酸発生剤は、1種単独で又は2種以上組み合わせて用いることができ、また、光酸発生剤と熱酸発生剤とを併用してもよい。
界面活性剤は、シリコン含有レジスト下層膜形成用組成物を基板に塗布した際に、ピンホール、ストレーション等の発生を抑制するのに有効である。界面活性剤としては、ノニオン系界面活性剤、アニオン系界面活性剤、カチオン系界面活性剤、シリコン系界面活性剤、フッ素系界面活性剤、UV硬化型界面活性剤等が挙げられる。より具体的には、例えば、ポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンセチルエーテル、ポリオキシエチレンオレイルエーテル等のポリオキシエチレンアルキルエーテル類、ポリオキシエチレンオクチルフェノールエーテル、ポリオキシエチレンノニルフェノールエーテル等のポリオキシエチレンアルキルアリールエーテル類、ポリオキシエチレン・ポリオキシプロピレンブロックコポリマー類、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノステアレート、ソルビタンモノオレエート、ソルビタントリオレエート、ソルビタントリステアレート等のソルビタン脂肪酸エステル類、ポリオキシエチレンソルビタンモノラウレート、ポリオキシエチレンソルビタンモノパルミテート、ポリオキシエチレンソルビタンモノステアレート、ポリオキシエチレンソルビタントリオレエート、ポリオキシエチレンソルビタントリステアレート等のポリオキシエチレンソルビタン脂肪酸エステル類等のノニオン系界面活性剤、商品名エフトップ(登録商標)EF301、EF303、EF352(三菱マテリアル電子化成(株)(旧(株)トーケムプロダクツ)製)、商品名メガファック(登録商標)F171、F173、R-08、R-30、R-30N、R-40LM(DIC(株)製)、フロラードFC430、FC431(スリーエムジャパン(株)製)、商品名アサヒガード(登録商標)AG710(AGC(株)製)、サーフロン(登録商標)S-382、SC101、SC102、SC103、SC104、SC105、SC106(AGCセイミケミカル(株)製)等のフッ素系界面活性剤、及びオルガノシロキサンポリマ-KP341(信越化学工業(株)製)等を挙げることができるが、これらに限定されない。
界面活性剤は、1種単独で又は2種以上組み合わせて用いることができる。
レオロジー調整剤は、主にシリコン含有レジスト下層膜形成用組成物の流動性を向上させ、特にベーキング工程において、形成される膜の膜厚均一性の向上や、ホール内部への組成物の充填性を高める目的で添加される。具体例としては、ジメチルフタレート、ジエチルフタレート、ジi-ブチルフタレート、ジヘキシルフタレート、ブチルi-デシルフタレート等のフタル酸誘導体、ジノルマルブチルアジペート、ジ-i-ブチルアジペート、ジ-i-オクチルアジペート、オクチルデシルアジペート等のアジピン酸誘導体、ジノルマルブチルマレート、ジエチルマレート、ジノニルマレート等のマレイン酸誘導体、メチルオレート、ブチルオレート、テトラヒドロフルフリルオレート等のオレイン酸誘導体、またはノルマルブチルステアレート、グリセリルステアレート等のステアリン酸誘導体等を挙げることができる。
これらのレオロジー調整剤が使用される場合、その添加量は、シリコン含有レジスト下層膜形成用組成物の全膜形成成分に対して通常30質量%未満である。
接着補助剤は、主に基板あるいはレジストと、シリコン含有レジスト下層膜形成用組成物から形成される膜(レジスト下層膜)との密着性を向上させ、特に現像においてレジストの剥離を抑制・防止する目的で添加される。具体例としては、トリメチルクロロシラン、ジメチルビニルクロロシラン、メチルジフェニルクロロシラン、クロロメチルジメチルクロロシラン等のクロロシラン類、トリメチルメトキシシラン、ジメチルジエトキシシラン、メチルジメトキシシラン、ジメチルビニルエトキシシラン等のアルコキシシラン類、ヘキサメチルジシラザン、N,N’-ビス(トリメチルシリル)ウレア、ジメチルトリメチルシリルアミン、トリメチルシリルイミダゾール等のシラザン類、γ-クロロプロピルトリメトキシシラン、γ-アミノプロピルトリエトキシシラン、γ-グリシドキシプロピルトリメトキシシラン等のその他のシラン類、ベンゾトリアゾール、ベンズイミダゾール、インダゾール、イミダゾール、2-メルカプトベンズイミダゾール、2ーメルカプトベンゾチアゾール、2-メルカプトベンゾオキサゾール、ウラゾール、チオウラシル、メルカプトイミダゾール、メルカプトピリミジン等の複素環式化合物や、1,1-ジメチルウレア、1,3-ジメチルウレア等の尿素、又はチオ尿素化合物を挙げることができる。
これらの接着補助剤が使用される場合、その添加量は、シリコン含有レジスト下層膜形成用組成物の膜形成成分に対して通常5質量%未満、好ましくは2質量%未満である。
また、pH調整剤として、前述の安定化剤として挙げた有機酸などのカルボン酸基を1又は2以上有する酸の他を挙げることができる。pH調整剤が使用される場合のその添加量は、[A]ポリシロキサン又は[A’]ポリシロキサンの100質量部に対して、0.01~20質量部、又は0.01~10質量部、又は0.01~5質量部の割合とすることができる。
またシリコン含有レジスト下層膜形成用組成物に添加可能な金属酸化物としては、例えば、スズ(Sn)、チタン(Ti)、アルミニウム(Al)、ジルコニウム(Zr)、亜鉛(Zn)、ニオブ(Nb)、タンタル(Ta)及びW(タングステン)等の金属及びホウ素(B)、ケイ素(Si)、ゲルマニウム(Ge)、ヒ素(As)、アンチモン(Sb)、及びテルル(Te)等の半金属のうち1種又は2種以上の組み合わせの酸化物を挙げることができるが、これらに限定されない。
膜形成成分中の[A]ポリシロキサン又は[A’]ポリシロキサンの含有量は、通常20質量%~100質量%であるが、本発明の効果を再現性よく得る観点等から、その下限値は、好ましくは50質量%、より好ましくは60質量%、より一層好ましくは70質量%、更に好ましくは80質量%であり、その上限値は、好ましくは99質量%であり、その余を、後述の添加剤とすることができる。
また当該シリコン含有レジスト下層膜形成用組成物は、好ましくはpH2~5を有し、より好ましくはpH3~4を有する。
混合順序は特に限定されるものではない。例えば、[A]ポリシロキサンを含有する溶液に、及び[C]溶媒を加えて混合し、その混合物にその他の成分を加えてもよく、[A]ポリシロキサンを含有する溶液と、[C]溶媒と、その他の成分を同時に混合してもよい。
必要であれば、最後に更に[C]溶媒を追加で加えたり、[C]溶媒に比較的溶けやすい一部の成分を混合物中に含めずにおき、最後にそれを加えたりしてもよいが、構成成分の凝集や分離を抑制し、均一性に優れる組成物を再現性よく調製する観点から、[A]ポリシロキサンが良好に溶解した溶液を予め準備し、これを用いて組成物を調製することが好ましい。なお、[A]ポリシロキサンは、共に混ぜられる[C]溶媒の種類や量、その他の成分の量や性質等によっては、これらが混ぜられた際に凝集又は沈殿する可能性がある点に留意する。また、[A]ポリシロキサンが溶解した溶液を用いて組成物を調製する場合、最終的に得られる組成物中の[A]ポリシロキサンが所望の量となるように、[A]ポリシロキサンの溶液の濃度やその使用量を決める必要がある点も留意する。
組成物の調製において、成分が分解したり変質したりしない範囲で、適宜加熱してもよい。
混合順序は特に限定されるものではない。例えば、[A’]ポリシロキサンを含有する溶液に、[B]特定基を有する加水分解性シラン(A)、及び[C]溶媒を加えて混合し、その混合物にその他の成分を加えてもよく、[A’]ポリシロキサンを含有する溶液と、[B]特定基を有する加水分解性シラン(A)と、[C]溶媒と、その他の成分を同時に混合してもよい。
必要であれば、最後に更に[C]溶媒を追加で加えたり、[C]溶媒に比較的溶けやすい一部の成分を混合物中に含めずにおき、最後にそれを加えたりしてもよいが、構成成分の凝集や分離を抑制し、均一性に優れる組成物を再現性よく調製する観点から、[A’]ポリシロキサンが良好に溶解した溶液を予め準備し、これを用いて組成物を調製することが好ましい。なお、[A’]ポリシロキサンは、共に混ぜられる[B]特定基を有する加水分解性シラン(A)及び[C]溶媒の種類や量、その他の成分の量や性質等によっては、これらが混ぜられた際に凝集又は沈殿する可能性がある点に留意する。また、[A’]ポリシロキサンが溶解した溶液を用いて組成物を調製する場合、最終的に得られる組成物中の[A’]ポリシロキサンが所望の量となるように、[A’]ポリシロキサンの溶液の濃度やその使用量を決める必要がある点も留意する。
組成物の調製において、成分が分解したり変質したりしない範囲で、適宜加熱してもよい。
以下、本発明の一態様として、本発明のシリコン含有レジスト下層膜、又は本発明のシリコン含有レジスト下層膜形成用組成物を使用したパターン形成方法、並びに、半導体素子の製造方法について説明する。
シリコン含有レジスト下層膜は、本発明のレジスト下層膜であるか、又は本発明のシリコン含有レジスト下層膜形成用組成物の硬化物レジスト下層膜である。
基板上に、有機下層膜を形成する工程と、
有機下層膜の上に、本発明のシリコン含有レジスト下層膜形成用組成物を用いてレジスト下層膜を形成する工程と、
レジスト下層膜の上に、レジスト膜を形成する工程と、
を含む。
半導体基板上に有機下層膜を形成する工程と、
有機下層膜の上に、本発明のシリコン含有レジスト下層膜形成用組成物を塗布し、焼成して、レジスト下層膜を形成する工程と、
レジスト下層膜の上に、レジスト膜形成用組成物を塗布し、レジスト膜を形成する工程と、
レジスト膜を露光、現像し、レジストパターンを得る工程と、
レジストパターンをマスクに用い、レジスト下層膜をエッチングする工程と、
パターン化されたレジスト下層膜をマスクとして用い、有機下層膜をエッチングする工程と、
を含む。
焼成する条件としては、焼成温度40℃~400℃、又は80℃~250℃、焼成時間0.3分間~60分間の中から適宜選択される。好ましくは、焼成温度150℃~250℃、焼成時間0.5分間~2分間である。
ここで形成されるレジスト下層膜の膜厚としては、例えば、10nm~1,000nmであり、又は20nm~500nmであり、又は50nm~300nmであり、又は100nm~200nm、又は10~150nmである。
なおレジスト下層膜の形成時に使用するシリコン含有レジスト下層膜形成用組成物として、ナイロンフィルタろ過したシリコン含有レジスト下層膜形成用組成物を用いることができる。ここでナイロンフィルタろ過したシリコン含有レジスト下層膜形成用組成物とは、シリコン含有レジスト下層膜形成用組成物を製造する途中の段階において、又は全ての成分を混合した後に、ナイロンフィルタろ過を行った組成物を指す。
ここで使用する有機下層膜としては、特に制限はなく、これまでリソグラフィープロセスにおいて慣用されているものの中から任意に選択して使用することができる。
基板上に、有機下層膜、その上にレジスト下層膜、さらにその上に後述するレジスト膜を設けた態様とすることにより、フォトレジスト膜のパターン幅が狭くなり、パターン倒れを防ぐ為にフォトレジスト膜を薄く被覆した場合でも、後述する適切なエッチングガスを選択することにより基板の加工が可能になる。例えば、フォトレジスト膜に対して十分に早いエッチング速度を有するフッ素系ガスをエッチングガスとして用いて、レジスト下層膜の加工が可能であり、またレジスト下層膜に対して十分に早いエッチング速度を有する酸素系ガスをエッチングガスとして用いて、有機下層膜の加工が可能であり、更に有機下層膜に対して十分に早いエッチング速度を有するフッ素系ガスをエッチングガスとして用いて、基板の加工を行うことができる。
なお、この際に用い得る基板及び塗布方法は、上述したものと同じものが挙げられる。
レジスト膜の膜厚は、例えば10nm~10,000nmであり、又は100nm~2,000nmであり、又は200nm~1,000nmであり、又は30nm~200nmである。
市販品として入手可能な具体例としては、シプレー社製商品名APEX-E、住友化学(株)製商品名PAR710、JSR(株)製;商品名AR2772JN、及び信越化学工業(株)製商品名SEPR430等が挙げられるが、これらに限定されない。また、例えば、Proc.SPIE,Vol.3999,330-334(2000)、Proc.SPIE,Vol.3999,357-364(2000)、やProc.SPIE,Vol.3999,365-374(2000)に記載されているような、含フッ素原子ポリマー系フォトレジスト材料を挙げることができる。
電子線レジスト膜を形成するための電子線レジスト材料としては、ネガ型材料、ポジ型材料いずれも使用できる。その具体例としては、酸発生剤と酸により分解してアルカリ溶解速度を変化させる基を有するバインダーからなる化学増幅型レジスト材料、アルカリ可溶性バインダーと酸発生剤と酸により分解してレジスト材料のアルカリ溶解速度を変化させる低分子化合物からなる化学増幅型レジスト材料、酸発生剤と酸により分解してアルカリ溶解速度を変化させる基を有するバインダーと酸により分解してレジスト材料のアルカリ溶解速度を変化させる低分子化合物からなる化学増幅型レジスト材料、電子線によって分解してアルカリ溶解速度を変化させる基を有するバインダーからなる非化学増幅型レジスト材料、電子線によって切断されアルカリ溶解速度を変化させる部位を有するバインダーからなる非化学増幅型レジスト材料などがある。これらの電子線レジスト材料を用いた場合も、照射源を電子線としてフォトレジスト材料を用いた場合と同様にレジスト膜のパターンを形成することができる。
またEUVレジスト膜を形成するためのEUVレジスト材料としては、メタクリレート樹脂系レジスト材料、金属酸化物レジスト材料を用いることができる。
金属酸化物レジスト材料として、例えば、特開2019-113855号公報に記載の、金属炭素結合及び/又は金属カルボキシラート結合により有機配位子を有する金属オキソ-ヒドロキソネットワークを含むコーティング組成物が挙げられる。
露光後、必要に応じて露光後加熱(post exposure bake)を行うこともできる。露光後加熱は、加熱温度70℃~150℃、加熱時間0.3分間~10分間から適宜選択された条件で行われる。
現像液(アルカリ現像液)としては、水酸化カリウム、水酸化ナトリウムなどのアルカリ金属水酸化物の水溶液、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、コリンなどの水酸化四級アンモニウムの水溶液、エタノールアミン、プロピルアミン、エチレンジアミンなどのアミン水溶液等のアルカリ性水溶液(アルカリ現像液)等を例として挙げることができる。さらに、これらの現像液に界面活性剤などを加えることもできる。現像の条件としては、温度5~50℃、時間10秒~600秒から適宜選択される。
現像液(有機溶剤)としては、例えば、酢酸メチル、酢酸ブチル、酢酸エチル、酢酸イソプロピル、酢酸アミル、酢酸イソアミル、メトキシ酢酸エチル、エトキシ酢酸エチル、プロピ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、エチレングリコールモノプロピルエーテルアセテート、エチレングリコールモノブチルエーテルアセテート、エチレングリコールモノフェニルエーテルアセテート、ジエチレングリコールモノメチルエーテルアセテート、ジエチレングリコールモノプロピルエーテルアセテート、ジ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フェニルエーテルアセテート、ジエチレングリコールモノブチルエーテルアセテート、ジエチレングリコールモノエチルエーテルアセテート、2-メトキシブチルアセテート、3-メトキシブチルアセテート、4-メトキシブチルアセテート、3-メチル-3-メトキシブチルアセテート、3-エチル-3-メトキシブチルアセテート、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、プロピレングリコールモノプロピルエーテルアセテート、2-エトキシブチルアセテート、4-エトキシブチルアセテート、4-プロポキシブチルアセテート、2-メトキシペンチルアセテート、3-メトキシペンチルアセテート、4-メトキシペンチルアセテート、2-メチル-3-メトキシペンチルアセテート、3-メチル-3-メトキシペンチルアセテート、3-メチル-4-メトキシペンチルアセテート、4-メチル-4-メトキシペンチルアセテート、プロピレングリコールジアセテート、ギ酸メチル、ギ酸エチル、ギ酸ブチル、ギ酸プロピル、乳酸エチル、乳酸ブチル、乳酸プロピル、炭酸エチル、炭酸プロピル、炭酸ブチル、ピルビン酸メチル、ピルビン酸エチル、ピルビン酸プロピル、ピルビン酸ブチル、アセト酢酸メチル、アセト酢酸エチル、プロピオン酸メチル、プロピオン酸エチル、プロピオン酸プロピル、プロピオン酸イソプロピル、2-ヒドロキシプロピオン酸メチル、2-ヒドロキシプロピオン酸エチル、メチル-3-メトキシプロピオネート、エチル-3-メトキシプロピオネート、エチル-3-エトキシプロピオネート、プロピル-3-メトキシプロピオネート等を例として挙げることができる。さらに、これらの現像液に界面活性剤などを加えることもできる。現像の条件としては、温度は5℃~50℃、時間は10秒~600秒から適宜選択される。
なおレジスト下層膜のドライエッチングには、ハロゲン系ガスを使用することが好ましい。ハロゲン系ガスによるドライエッチングでは、基本的に有機物質からなるレジスト膜(フォトレジスト膜)は除去されにくい。それに対し、ケイ素原子を多く含むレジスト下層膜はハロゲン系ガスによって速やかに除去される。そのため、該レジスト下層膜のドライエッチングに伴うフォトレジスト膜の膜厚の減少を抑えることができる。そして、その結果、フォトレジスト膜を薄膜で使用することが可能となる。従って、レジスト下層膜のドライエッチングはフッ素系ガスによることが好ましく、フッ素系ガスとしては、例えば、テトラフルオロメタン(CF4)、パーフルオロシクロブタン(C4F8)、パーフルオロプロパン(C3F8)、トリフルオロメタン、ジフルオロメタン(CH2F2)等が挙げられるが、これらに限定されない。
フッ素系ガスとしては、例えば、テトラフルオロメタン(CF4)、パーフルオロシクロブタン(C4F8)、パーフルオロプロパン(C3F8)、トリフルオロメタン、及びジフルオロメタン(CH2F2)等が挙げられる。
レジスト下層膜のドライエッチングは、パターン化において挙げたようにフッ素系ガスによることが好ましく、例えば、テトラフルオロメタン(CF4)、パーフルオロシクロブタン(C4F8)、パーフルオロプロパン(C3F8)、トリフルオロメタン、ジフルオロメタン(CH2F2)等が挙げられるが、これらに限定されない。
レジスト下層膜のウェットエッチングに使用される薬液としては、希フッ酸(フッ化水素酸)、バッファードフッ酸(HFとNH4Fの混合溶液)、塩酸と過酸化水素を含有する水溶液(SC-2薬液)、硫酸と過酸化水素を含有する水溶液(SPM薬液)、弗酸と過酸化水素を含有する水溶液(FPM薬液)や、アンモニアと過酸化水素を含有する水溶液(SC-1薬液)等のアルカリ性溶液が挙げられる。またアルカリ性溶液としては、前述のアンモニアと過酸化水素水と水の混合によるアンモニア過水(SC-1薬液)のほか、アンモニア、テトラメチルアンモニウムヒドロキシド(TMAH)、テトラエチルアンモニウムヒドロキシド、テトラプロピルアンモニウムヒドロキシド、テトラブチルアンモニウムヒドロキシド、コリンヒドロキシド、ベンジルトリメチルアンモニウムヒドロキシド、ベンジルトリエチルアンモニウムヒドロキシド、DBU(ジアザビシクロウンデセン)、DBN(ジアザビシクロノネン)、ヒドロキシルアミン、1-ブチル-1-メチルピロリジニウムヒドロキシド、1-プロピル-1-メチルピロリジニウムヒドロキシド、1-ブチル-1-メチルピペリジニウムヒドロキシド、1-プロピル-1-メチルピペリジニウムヒドロキシド、メピクアトヒドロキシド、トリメチルスルホニウムヒドロキシド、ヒドラジン類、エチレンジアミン類、又はグアニジンを1~99質量%含有する水溶液を挙げることができる。これら薬液は混合して用いることもできる。
さらにレジスト下層膜は、基板とレジスト膜(フォトレジスト膜等)との相互作用を防止するための層、レジスト膜に用いられる材料又はレジスト膜への露光時に生成する物質の基板への悪作用を防ぐ機能を有する層、加熱焼成時に基板から生成する物質のレジスト膜への拡散を防ぐ機能を有する層、及び半導体基板誘電体層によるレジスト膜のポイズニング効果を減少させるためのバリア層等として使用することも可能である。
また本発明のレジスト下層膜は、EUVレジスト膜の下層膜として、ハードマスクとしての機能以外にも、例えばEUVレジスト膜とインターミキシングすることなく、EUV露光(波長13.5nm)に際して好ましくない露光光、例えばUV(紫外)光やDUV(深紫外)光(:ArF光、KrF光)の基板又は界面からの反射を防止することができる。従って、EUVレジスト膜の下層反射防止膜を形成するために、本発明のシリコン含有レジスト下層膜形成用組成物を好適に用いることができる。すなわちEUVレジスト膜の下層として効率的に反射を防止することができる。EUVレジスト下層膜として用いた場合は、そのプロセスはフォトレジスト用下層膜と同様に行うことができる。
また、上述した通りの、有機下層膜を形成する工程と、該有機下層膜上に、本発明のシリコン含有レジスト下層膜形成用組成物を用いてレジスト下層膜を形成する工程と、当該シレジスト下層膜上に、レジスト膜を形成する工程とを含む、半導体素子の製造方法によれば、精度の高い半導体基板の加工を再現性よく実現できるため、半導体素子の安定的な製造を期待できる。
(1)分子量測定
本発明で用いるポリシロキサンの分子量は、GPC分析によるポリスチレン換算で得られる分子量である。
GPCの測定条件は、例えばGPC装置(商品名HLC-8220GPC、東ソー株式会社製)、GPCカラム(商品名Shodex(登録商標)KF803L、KF802、KF801、昭和電工株式会社製)、カラム温度は40℃、溶離液(溶出溶媒)はテトラヒドロフラン、流量(流速)は1.0mL/min、標準試料はポリスチレン(昭和電工株式会社製)を用いて行うことができる。
(2)1H-NMR
JEOL製核磁気共鳴装置1H-NMR(400MHz)、溶媒はd6-Acetoneを用いて評価した。
(3)残硝酸量
イオンクロマトグラフィー評価にて系内に残存する硝酸量を測定した。
(合成例1)
テトラエトキシシラン16.44g、メチルトリエトキシシラン12.67g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド2.92g及びプロピレングリコールモノエチルエーテル48.05gを300mLのフラスコに入れ、得られた混合溶液をマグネチックスターラーにて撹拌しながら0.1M硝酸水溶液19.91gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,200であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して3mol%であった。またポリマー溶液中の残硝酸量は0.08%であった。
テトラエトキシシラン15.28g、メチルトリエトキシシラン9.16g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド8.15g及びプロピレングリコールモノエチルエーテル48.89gを300mLのフラスコに入れ、得られた混合溶液をマグネチックスターラーにて撹拌しながら0.1M硝酸水溶液18.5gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,000であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して2mol%であった。またポリマー溶液中の残硝酸量は0.08%であった。
テトラエトキシシラン15.7g、メチルトリエトキシシラン10.76g、ジアリルイソシアヌレートプロピルトリエトキシシラン3.12g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド2.79g及びプロピレングリコールモノエチルエーテル48.6gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら硝酸水溶液(0.1mol/L)19.0gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw2,800であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して2mol%であった。またポリマー溶液中の残硝酸量は0.09%であった。
テトラエトキシシラン16.17g、メチルトリエトキシシラン11.07g、チオシアネートプロピルトリエトキシシラン2.05g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド2.88g及びプロピレングリコールモノエチルエーテル48.2gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら硝酸水溶液(0.1mol/L)19.6gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,300であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して3mol%であった。またポリマー溶液中の残硝酸量は0.1%であった。
テトラエトキシシラン15.92g、メチルトリエトキシシラン10.90g、トリエトキシ((2-メトキシ-4-(メトキシメチル)フェノキシ)メチル)シラン2.63g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド2.83g及びプロピレングリコールモノエチルエーテル48.4gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら硝酸水溶液(0.1mol/L)18.8gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,500であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して3mol%であった。またポリマー溶液中の残硝酸量は0.09%であった。
テトラエトキシシラン16.19g、メチルトリエトキシシラン11.09g、ビシクロ[2.2.1]ヘプト-5-エン-2-イルトリエトキシシラン1.99g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド2.88g及びプロピレングリコールモノエチルエーテル48.2gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら硝酸水溶液(0.1mol/L)19.6gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,000であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して4mol%であった。またポリマー溶液中の残硝酸量は0.1%であった。
テトラエトキシシラン16.4g、メチルトリエトキシシラン12.36g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド2.92g及びプロピレングリコールモノエチルエーテル48.1gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらジメチルアミノプロピルトリメトキシシラン0.36gと硝酸水溶液(0.2mol/L)19.9gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、メタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,200であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して3mol%であった。またポリマー溶液中の残硝酸量は0.16%であった。
テトラエトキシシラン16.28g、メチルトリエトキシシラン12.26g、4-ニトロ-N-(3-(トリエトキシシリル)プロピル)ベンズアミド2.90g及びプロピレングリコールモノエチルエーテル48.2gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら2,4-ジニトロ-N-(3-トリエトキシシリル)プロピル)アニリン0.67gと硝酸水溶液(0.2mol/L)19.7gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間還流させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,000であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して4mol%であった。またポリマー溶液中の残硝酸量は0.15%であった。
テトラエトキシシラン16.34g、メチルトリエトキシシラン12.31g、4-メトキシ-N-(3-トリエトキシシリル)プロピル)ベンゼンスルホンアミド3.07g及びプロピレングリコールモノエチルエーテル48.1gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらジメチルアミノプロピルトリメトキシシラン0.36gと硝酸水溶液(0.2mol/L)19.8gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、メタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,200であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して3mol%であった。またポリマー溶液中の残硝酸量は0.16%であった。
テトラエトキシシラン16.39g、メチルトリエトキシシラン12.35g、トリエトキシ(3-((4-メトキシフェニル)スルホニル)プロピルシラン2.96g及びプロピレングリコールモノエチルエーテル48.1gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらジメチルアミノプロピルトリメトキシシラン0.36gと硝酸水溶液(0.2mol/L)19.9gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、メタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw2,900であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して3mol%であった。またポリマー溶液中の残硝酸量は0.15%であった。
テトラエトキシシラン16.65g、メチルトリエトキシシラン12.54g、トリメトキシ(フェナントレンニル)シラン2.38g及びプロピレングリコールモノエチルエーテル47.9gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながらジメチルアミノプロピルトリメトキシシラン0.36gと硝酸水溶液(0.2mol/L)20.2gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、メタノール及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw2,800であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して4mol%であった。またポリマー溶液中の残硝酸量は0.14%であった。
テトラエトキシシラン23.35g、メチルトリエトキシシラン8.57g及びプロピレングリコールモノエチルエーテル47.9gを300mLのフラスコに入れ、混合溶液をマグネチックスターラーにて撹拌しながら硝酸水溶液(0.1mol/L)20.2gを滴下した。
滴下後、60℃に調整されたオイルバスにフラスコを移し、20時間反応させた。その後、反応副生物である、エタノール、及び水を減圧留去し、濃縮して加水分解縮合物(ポリマー)溶液を得た。
得られた溶液にさらにプロピレングリコールモノエチルエーテルを加え、プロピレングリコールモノエチルエーテル100%の溶媒比率として140℃における固形残物換算で20質量パーセントとなるように濃度調整し、ナイロン製フィルタ(孔径0.1μm)にてろ過を行った。
得られたポリマーは下記式で表される構造を含むポリシロキサンを含み、その重量平均分子量は、GPCによるポリスチレン換算でMw3,300であった。また、1H-NMRよりプロピレングリコールモノエチルエーテルによりキャッピングされている量はSi原子に対して4mol%であった。またポリマー溶液中の残硝酸量は0.08%であった。
上記合成例で得られたポリシロキサン(ポリマー)、安定化剤(添加剤1)、硬化触媒(添加剤2)、及び溶媒を表1に示す割合で混合し、0.1μmのフッ素樹脂製のフィルタでろ過することによって、レジスト下層膜形成用組成物をそれぞれ調製した。表1中の各添加量は質量部で示した。
なお、加水分解縮合物(ポリマー)は合成例で得た該縮合物を含む溶液として組成物を調製しているが、表1中のポリマーの添加割合はポリマー溶液の添加量ではなく、ポリマー自体の添加量を示した。
<溶媒>
DIW:超純水
PGEE:プロピレングリコールモノエチルエーテル
PGME:プロピレングリコールモノメチルエーテル
<添加剤1(安定化剤)>
MA:マレイン酸
<添加剤2(硬化触媒)>
TPSNO3:トリフェニルスルホニウム硝酸塩
TPSML:トリフェニルスルホニウムマレイン酸塩
TPSTfAc:トリフェニルスルホニウムトリフルオロ酢酸塩
IMTEOS:トリエトキシシリルプロピル-4,5-ジヒドロイミダゾール
TPSAc:トリフェニルスルホニウム酢酸塩
BTEAC:ベンジルトリエチルアンモニウムクロライド塩
TPSCl:トリフェニルスルホニウムクロライド塩
窒素下、100mlの四口フラスコにカルバゾール(6.69g、0.040mol、東京化成工業(株)製)、9-フルオレノン(7.28g、0.040mol、東京化成工業(株)製)、及びパラトルエンスルホン酸一水和物(0.76g、0.0040mol、東京化成工業(株)製)を加え、1,4-ジオキサン(6.69g、関東化学(株)製)を仕込み撹拌し、100℃まで昇温し溶解させ重合を開始した。24時間後、60℃まで放冷した。
冷却した反応混合物に、クロロホルム(34g、関東化学(株)製)を加えて希釈し、希釈した混合物をメタノール(168g、関東化学(株)製)に添加して沈殿させた。
得られた沈殿物をろ過して回収し、回収した固体を減圧乾燥機で80℃、24時間乾燥し、目的とする式(X)で表されるポリマー(以下PCzFLと略す)9.37gを得た。
なお、PCzFLの1H-NMRの測定結果は以下の通りであった。
1H-NMR(400MHz,DMSO-d6):δ(ppm)7.03-7.55(br,12H),δ7.61-8.10(br,4H),δ11.18(br,1H)
また、PCzFLの重量平均分子量Mwは、GPCによるポリスチレン換算では2,800、多分散度Mw/Mnは1.77であった。
実施例1~11及び比較例1で調製した組成物を、スピナーを用いてシリコンウェハー上にそれぞれ塗布した。ホットプレート上で215℃1分間加熱し、Si含有レジスト下層膜をそれぞれ形成し、得られた下層膜の膜厚を計測した。膜厚は約20nmであった。
その後、各Si含有レジスト下層膜上に、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メチルエーテルアセテートの混合溶媒(7/3(V/V))を塗布してスピン乾燥した。塗布後の下層膜の膜厚を計測し、混合溶媒塗布前の膜厚を基準(100%)として、混合溶媒塗布後の膜厚の変化の割合(%)を算出した。混合溶媒塗布前後での膜厚変化が1%以下のものを「良好」、膜厚変化が1%超のものを「硬化せず」と評価した。
また同様の方法でシリコンウェハー上に作製した各Si含有レジスト下層膜上に、アルカリ現像液(水酸化テトラメチルアンモニウム(TMAH)2.38%水溶液)を塗布してスピン乾燥し、塗布後の下層膜の膜厚を計測し、現像液塗布前の膜厚を基準(100%)として、現像液塗布後の膜厚の変化の割合(%)を算出した。現像液塗布前後での膜厚変化が1%以下のものを「良好」、膜厚変化が1%超のものを「硬化せず」とした。
得られた結果を表2に示す。
実施例1~11及び比較例1で調製した組成物を、スピナーを用いてシリコンウェハー上にそれぞれ塗布した。ホットプレート上で215℃1分間加熱し、膜厚約20nmのSi含有レジスト下層膜をそれぞれ形成した。これらのレジスト下層膜を分光エリプソメーター(J.A. Woollam社製、VUV-VASE VU-302)を用い、波長220-300nmでの光学吸光係数(k値、減衰係数とも呼ぶ)を測定した。220-300nmの波長領域において最も高いk値を表3に示す。
シリコンウェハー上に、上記有機下層膜形成用組成物をスピンコートし、ホットプレート上で215℃で1分間加熱することで、有機下層膜(A層)(膜厚90nm)を形成した。
その上に、実施例1で得られた組成物をスピンコートし、ホットプレート上で215℃で1分間加熱することにより、レジスト下層膜(B層)(20nm)を形成した。
更にその上に、EUV用レジスト溶液(メタクリレート樹脂系レジスト)をスピンコートし、110℃で1分間加熱することにより、EUVレジスト膜(C層)を形成し、その後、ASML製EUV露光装置(NXE3400)を用い、NA=0.33、σ=0.63/0.84、Dipoleの条件で露光した。
露光後、露光後加熱(PEB、105℃1分間)を行い、クーリングプレート上で室温まで冷却し、TMAH2.38%現像液を用いて30秒現像し、リンス処理をし、レジストパターンを形成した。
パターン形状の観察において、フッティングからアンダーカットの間の形状であり、かつスペース部に著しい残渣がないという状態を「良好」、レジストパターンが倒れる好ましくない状態を「倒れ」と評価した。得られた結果を表4に示す。
Claims (24)
- 220nm~300nmの波長領域における光学吸光係数(k値)の最大値が、0.05以上である、シリコン含有レジスト下層膜。
- ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する、請求項1に記載のシリコン含有レジスト下層膜。
- EUVリソグラフィー用レジスト下層膜である、請求項1に記載のシリコン含有レジスト下層膜。
- [A]成分:ポリシロキサン、及び
[C]成分:溶媒
を含有し、
前記ポリシロキサンが、ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する加水分解性シラン(A)由来の構成単位を含む、シリコン含有レジスト下層膜形成用組成物。 - [A’]成分:ポリシロキサン、
[B]成分:ニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有する加水分解性シラン(A)、及び
[C]成分:溶媒
を含有する、シリコン含有レジスト下層膜形成用組成物。 - 前記加水分解性シラン(A)が、下記式(A-1)で表される化合物である、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物。
bは0~2の整数を表す。
a+bは、1~3の整数を表す。
R1はニトロフェニル基、メトキシフェニルスルホニル基、及びフェナントリル基の少なくともいずれかを有しかつイオン結合を有していてもよい基を表す。
R2は置換されていてもよいアルキル基、置換されていてもよいアリール基(ただし、フェナントリル基を除く。)、置換されていてもよいアラルキル基、置換されていてもよいハロゲン化アルキル基、置換されていてもよいハロゲン化アリール基、置換されていてもよいハロゲン化アラルキル基、置換されていてもよいアルコキシアルキル基、置換されていてもよいアルコキシアリール基、置換されていてもよいアルコキシアラルキル基、若しくは置換されていてもよいアルケニル基を表すか、又はエポキシ基を有する有機基、アクリロイル基を有する有機基、メタクリロイル基を有する有機基、メルカプト基を有する有機基、アミノ基を有する有機基、アルコキシ基を有する有機基、スルホニル基(ただし、メトキシフェニルスルホニル基を除く。)を有する有機基、若しくはシアノ基を有する有機基、又はそれらの2種以上の組み合わせを表す。
Xはアルコキシ基、アラルキルオキシ基、アシルオキシ基、又はハロゲン原子を表す。
R1、R2及びXがそれぞれ複数の場合、複数のR1、R2及びXは同一でもよいし、異なっていてもよい。) - 前記[A]成分であるポリシロキサンが、シラノール基の一部がアルコール変性された又はアセタール保護されたポリシロキサン変性物である、請求項4に記載のシリコン含有レジスト下層膜形成用組成物。
- 前記[A’]成分であるポリシロキサンが、シラノール基の一部がアルコール変性された又はアセタール保護されたポリシロキサン変性物である、請求項5に記載のシリコン含有レジスト下層膜形成用組成物。
- 前記[C]成分が、アルコール系溶媒を含有する、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物。
- 前記[C]成分が、プロピレングリコールモノアルキルエーテルを含有する、請求項10に記載のシリコン含有レジスト下層膜形成用組成物。
- [D]成分:硬化触媒を更に含有する、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物。
- [E]成分:硝酸を更に含有する、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物。
- 前記[C]成分が、水を含有する、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物。
- EUVリソグラフィー用レジスト下層膜形成用である、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物。
- 請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物の硬化物である、シリコン含有レジスト下層膜。
- 半導体基板と、
請求項1~3のいずれかに記載のシリコン含有レジスト下層膜と、
を備える半導体加工用基板。 - 半導体基板と、
請求項16に記載のシリコン含有レジスト下層膜と、
を備える半導体加工用基板。 - 基板上に、有機下層膜を形成する工程と、
前記有機下層膜の上に、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物を用いてレジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜を形成する工程と、
を含む、半導体素子の製造方法。 - 前記レジスト膜が、EUVリソグラフィー用レジストから形成される、
請求項19に記載の半導体素子の製造方法。 - 前記レジスト下層膜を形成する工程において、ナイロンフィルタろ過したシリコン含有レジスト下層膜形成用組成物を用いる、
請求項19に記載の半導体素子の製造方法。 - 半導体基板上に有機下層膜を形成する工程と、
前記有機下層膜の上に、請求項4又は5に記載のシリコン含有レジスト下層膜形成用組成物を塗布し、焼成して、レジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜形成用組成物を塗布し、レジスト膜を形成する工程と、
前記レジスト膜を露光、現像し、レジストパターンを得る工程と、
前記レジストパターンをマスクに用い、前記レジスト下層膜をエッチングする工程と、
パターン化された前記レジスト下層膜をマスクとして用い、前記有機下層膜をエッチングする工程と、
を含む、パターン形成方法。 - 前記有機下層膜をエッチングする工程の後に、薬液を用いた湿式法により前記レジスト下層膜を除去する工程、
を更に含む、請求項22に記載のパターン形成方法。 - 前記レジスト膜が、EUVリソグラフィー用レジストから形成される、
請求項22に記載のパターン形成方法。
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WO2017043344A1 (ja) * | 2015-09-09 | 2017-03-16 | 日産化学工業株式会社 | シリコン含有平坦化性パターン反転用被覆剤 |
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