WO2018135456A1 - 微細相分離パターン形成のための自己組織化膜形成組成物 - Google Patents
微細相分離パターン形成のための自己組織化膜形成組成物 Download PDFInfo
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- WO2018135456A1 WO2018135456A1 PCT/JP2018/000904 JP2018000904W WO2018135456A1 WO 2018135456 A1 WO2018135456 A1 WO 2018135456A1 JP 2018000904 W JP2018000904 W JP 2018000904W WO 2018135456 A1 WO2018135456 A1 WO 2018135456A1
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- Prior art keywords
- block copolymer
- group
- solvent
- silicon
- structural unit
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- 238000002156 mixing Methods 0.000 description 1
- XZSZONUJSGDIFI-UHFFFAOYSA-N n-(4-hydroxyphenyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NC1=CC=C(O)C=C1 XZSZONUJSGDIFI-UHFFFAOYSA-N 0.000 description 1
- QYZFTMMPKCOTAN-UHFFFAOYSA-N n-[2-(2-hydroxyethylamino)ethyl]-2-[[1-[2-(2-hydroxyethylamino)ethylamino]-2-methyl-1-oxopropan-2-yl]diazenyl]-2-methylpropanamide Chemical compound OCCNCCNC(=O)C(C)(C)N=NC(C)(C)C(=O)NCCNCCO QYZFTMMPKCOTAN-UHFFFAOYSA-N 0.000 description 1
- QKCGXXHCELUCKW-UHFFFAOYSA-N n-[4-[4-(dinaphthalen-2-ylamino)phenyl]phenyl]-n-naphthalen-2-ylnaphthalen-2-amine Chemical compound C1=CC=CC2=CC(N(C=3C=CC(=CC=3)C=3C=CC(=CC=3)N(C=3C=C4C=CC=CC4=CC=3)C=3C=C4C=CC=CC4=CC=3)C3=CC4=CC=CC=C4C=C3)=CC=C21 QKCGXXHCELUCKW-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229940017144 n-butyl lactate Drugs 0.000 description 1
- WIBFFTLQMKKBLZ-SEYXRHQNSA-N n-butyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCCCC WIBFFTLQMKKBLZ-SEYXRHQNSA-N 0.000 description 1
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001298 n-hexoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- QJQAMHYHNCADNR-UHFFFAOYSA-N n-methylpropanamide Chemical compound CCC(=O)NC QJQAMHYHNCADNR-UHFFFAOYSA-N 0.000 description 1
- 125000003935 n-pentoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- RDMQYWPHYCZEKB-UHFFFAOYSA-N naphthalene-1-sulfonate;pyridin-1-ium Chemical compound C1=CC=[NH+]C=C1.C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 RDMQYWPHYCZEKB-UHFFFAOYSA-N 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- WSGCRAOTEDLMFQ-UHFFFAOYSA-N nonan-5-one Chemical compound CCCCC(=O)CCCC WSGCRAOTEDLMFQ-UHFFFAOYSA-N 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical class CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
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- 150000002888 oleic acid derivatives Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000005375 organosiloxane group Chemical group 0.000 description 1
- GIPDEPRRXIBGNF-KTKRTIGZSA-N oxolan-2-ylmethyl (z)-octadec-9-enoate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC1CCCO1 GIPDEPRRXIBGNF-KTKRTIGZSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- QUBQYFYWUJJAAK-UHFFFAOYSA-N oxymethurea Chemical compound OCNC(=O)NCO QUBQYFYWUJJAAK-UHFFFAOYSA-N 0.000 description 1
- JYVLIDXNZAXMDK-UHFFFAOYSA-N pentan-2-ol Chemical compound CCCC(C)O JYVLIDXNZAXMDK-UHFFFAOYSA-N 0.000 description 1
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- GXOHBWLPQHTYPF-UHFFFAOYSA-N pentyl 2-hydroxypropanoate Chemical compound CCCCCOC(=O)C(C)O GXOHBWLPQHTYPF-UHFFFAOYSA-N 0.000 description 1
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- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
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- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 description 1
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- 239000001818 polyoxyethylene sorbitan monostearate Substances 0.000 description 1
- 235000010989 polyoxyethylene sorbitan monostearate Nutrition 0.000 description 1
- 239000001816 polyoxyethylene sorbitan tristearate Substances 0.000 description 1
- 235000010988 polyoxyethylene sorbitan tristearate Nutrition 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- RLUCXJBHKHIDSP-UHFFFAOYSA-N propane-1,2-diol;propanoic acid Chemical compound CCC(O)=O.CC(O)CO RLUCXJBHKHIDSP-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000005930 sec-butyloxycarbonyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(OC(*)=O)C([H])([H])[H] 0.000 description 1
- 125000003548 sec-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
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- 229940035044 sorbitan monolaurate Drugs 0.000 description 1
- 239000001593 sorbitan monooleate Substances 0.000 description 1
- 235000011069 sorbitan monooleate Nutrition 0.000 description 1
- 229940035049 sorbitan monooleate Drugs 0.000 description 1
- 235000011071 sorbitan monopalmitate Nutrition 0.000 description 1
- 239000001570 sorbitan monopalmitate Substances 0.000 description 1
- 229940031953 sorbitan monopalmitate Drugs 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 239000001589 sorbitan tristearate Substances 0.000 description 1
- 235000011078 sorbitan tristearate Nutrition 0.000 description 1
- 229960004129 sorbitan tristearate Drugs 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- SJMYWORNLPSJQO-UHFFFAOYSA-N tert-butyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC(C)(C)C SJMYWORNLPSJQO-UHFFFAOYSA-N 0.000 description 1
- PFBLRDXPNUJYJM-UHFFFAOYSA-N tert-butyl 2-methylpropaneperoxoate Chemical compound CC(C)C(=O)OOC(C)(C)C PFBLRDXPNUJYJM-UHFFFAOYSA-N 0.000 description 1
- JJQPJEWSKYMIDU-UHFFFAOYSA-N tert-butyl 7,7-dimethyloctanoate Chemical compound CC(C)(C)CCCCCC(=O)OC(C)(C)C JJQPJEWSKYMIDU-UHFFFAOYSA-N 0.000 description 1
- 125000005931 tert-butyloxycarbonyl group Chemical group [H]C([H])([H])C(OC(*)=O)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- BRGJIIMZXMWMCC-UHFFFAOYSA-N tetradecan-2-ol Chemical compound CCCCCCCCCCCCC(C)O BRGJIIMZXMWMCC-UHFFFAOYSA-N 0.000 description 1
- 229940072958 tetrahydrofurfuryl oleate Drugs 0.000 description 1
- RAOIDOHSFRTOEL-UHFFFAOYSA-N tetrahydrothiophene Chemical compound C1CCSC1 RAOIDOHSFRTOEL-UHFFFAOYSA-N 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000006276 transfer reaction Methods 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 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
- XMUJIPOFTAHSOK-UHFFFAOYSA-N undecan-2-ol Chemical compound CCCCCCCCCC(C)O XMUJIPOFTAHSOK-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D153/00—Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
- C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
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- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
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- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F287/00—Macromolecular compounds obtained by polymerising monomers on to block polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
- C08F299/022—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates from polycondensates with side or terminal unsaturations
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
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- G—PHYSICS
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- 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
- G03F7/0002—Lithographic processes using patterning methods other than those involving the exposure to radiation, e.g. by stamping
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- 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
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- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02118—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer carbon based polymeric organic or inorganic material, e.g. polyimides, poly cyclobutene or PVC
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02282—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process liquid deposition, e.g. spin-coating, sol-gel techniques, spray coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02296—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer
- H01L21/02318—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment
- H01L21/02356—Forming insulating materials on a substrate characterised by the treatment performed before or after the formation of the layer post-treatment treatment to change the morphology of the insulating layer, e.g. transformation of an amorphous layer into a crystalline layer
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- 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
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
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- B05D2350/60—Adding a layer before coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05D2518/10—Silicon-containing polymers
Definitions
- the present invention relates to a self-assembled film forming composition for forming a fine phase separation pattern, preferably a self-assembled film forming composition for forming a fine phase separation pattern in a semiconductor device manufacturing process.
- Patent Document 1 uses a composition containing a first polymer that is a block copolymer and a second polymer having a surface free energy smaller than that of the block copolymer, and the second polymer is unevenly distributed in the surface layer region.
- a pattern forming method is disclosed.
- the present invention induces the microphase separation structure of the layer containing the block copolymer perpendicularly to the substrate even at a high heating temperature at which poor arrangement of the microphase separation of the block copolymer occurs.
- An object of the present invention is to provide a self-assembled film forming composition. It is another object of the present invention to provide a block copolymer phase separation pattern manufacturing method and a semiconductor device manufacturing method using such a composition.
- the present invention includes the following.
- a self-assembled film-forming composition comprising a block copolymer and at least two solvents having different boiling points as solvents,
- the block copolymer is substituted with a silicon-free polymer having a silicon-free polymer having a structural unit derived from styrene or a derivative thereof, which may be substituted with an organic group, or a structural unit derived from lactide, as a structural unit.
- the self-assembled film-forming composition wherein the solvent comprises a low-boiling solvent (A) having a boiling point of 160 ° C or lower and a high-boiling solvent (B) having a boiling point of 170 ° C or higher.
- A low-boiling solvent
- B high-boiling solvent
- [3] A step of forming a block copolymer layer on a substrate using the self-assembled film forming composition according to [1] or [2], and (2) a block formed on the substrate. Phase-separating the copolymer layer; Including The block copolymer is substituted with a silicon-free polymer having a silicon-free polymer having a structural unit derived from styrene or a derivative thereof, which may be substituted with an organic group, or a structural unit derived from lactide, as a structural unit.
- a block copolymer obtained by bonding a silicon-containing polymer having styrene as a structural unit A method for producing a phase separation pattern of a block copolymer.
- the block copolymer is substituted with a silicon-free polymer having a silicon-free polymer having a structural unit derived from styrene or a derivative thereof, which may be substituted with an organic group, or a structural unit derived from lactide, as a structural unit.
- a block copolymer obtained by bonding a silicon-containing polymer having styrene as a structural unit A method for manufacturing a semiconductor device.
- a silicon-free polymer containing styrene optionally substituted with an organic group or a derivative thereof, or a silicon-free polymer containing a lactide-derived structure as a structural unit, and styrene substituted with a silicon-containing group A block copolymer obtained by bonding a silicon-containing polymer as a structural unit;
- a method in which a block copolymer is self-assembled using a self-assembled film-forming composition containing at least a low-boiling solvent (A) having a boiling point of 160 ° C. or lower and a high-boiling solvent (B) having a boiling point of 170 ° C. or higher as a solvent.
- the block copolymer is applied to the substrate over the entire surface of the coated film even at a firing temperature at which a microphase-separated alignment defect occurs in a single solvent composition of a silicon-containing block copolymer. It becomes possible to induce the microphase separation structure of the containing layer vertically.
- FIG. 2 is a scanning electron micrograph of a block copolymer layer having a good vertical lamellar arrangement on the entire surface by the self-assembled film composition (Example 1) according to the present invention. It is a scanning electron micrograph of a block copolymer layer in which a partial alignment defect has occurred in the horizontal lamella alignment by the self-assembled film composition (Comparative Example 1).
- FIG. 6 is a scanning electron micrograph of a block copolymer layer in which a partial alignment defect has occurred in a horizontal lamella alignment by a self-assembled film composition (Comparative Example 3).
- a self-assembled film forming composition comprising a block copolymer and at least two solvents having different boiling points as a solvent
- the block copolymer is a block copolymer obtained by bonding a silicon-free polymer having a structural unit derived from styrene or a derivative thereof or lactide and a silicon-containing polymer having a structural unit derived from styrene substituted with a silicon-containing group.
- the solvent comprises a low-boiling solvent (A) having a boiling point of 160 ° C. or lower and a high-boiling solvent (B) having a boiling point of 170 ° C.
- a method for self-organizing a block copolymer using the self-assembled film forming composition, a method for producing a phase separation pattern of the block copolymer, and a method for producing a semiconductor device are provided. This will be described in order below.
- Self-assembled film-forming composition 1.1. Solvent
- the self-assembled film-forming composition according to the present invention contains at least two types of solvents having different boiling points as a solvent, at least one of which is selected from low boiling point solvents (A) having a boiling point of 160 ° C. or lower, and at least another type. Is selected from high-boiling solvents (B) having a boiling point of 170 ° C. or higher.
- the boiling point here means a boiling point measured at 1 atm.
- the low boiling point solvent (A) and the high boiling point solvent (B) used in the self-assembled film-forming composition according to the present invention can be selected from, for example, the solvents listed below.
- aliphatic carbonization such as n-pentane, i-pentane, n-hexane, i-hexane, n-heptane, i-heptane, 2,2,4-trimethylpentane, n-octane, i-octane, cyclohexane, methylcyclohexane
- a hydrogen-based solvent Benzene, toluene, xylene, ethylbenzene, trimethylbenzene, methylethylbenzene, n-propylbenzene, i-propylbenzene, diethylbenzene, i-butylbenzene, triethylbenzene, di-i-propylbenzen
- Aromatic hydrocarbon solvents Methanol, ethanol, n-propanol, i-propanol, n-butanol, i-butanol, sec-butanol, t-butanol, n-pentanol, i-pentanol, 2-methylbutanol, sec-pentanol, t- Pentanol, 3-methoxybutanol, n-hexanol, 2-methylpentanol, sec-hexanol, 2-ethylbutanol, sec-heptanol, heptanol-3, n-octanol, 2-ethylhexanol, sec-octanol, n- Nonyl alcohol, 2,6-dimethylheptanol-4, n-decanol, sec-undecyl alcohol, trimethylnonyl alcohol, sec-tetradecyl alcohol, sec-heptadec
- the low boiling point solvent (A) having a boiling point of 160 ° C. or lower for example, propylene glycol monomethyl ether acetate (boiling point: 146 ° C.), n-butyl acetate (boiling point: 126 ° C.), methyl isobutyl ketone (boiling point: 116 ° C.) is preferable. .
- N-methylpyrrolidone (boiling point: 204 ° C.), diethylene glycol monomethyl ether (boiling point: 193 ° C.), N, N-dimethylisobutyramide (boiling point: 175 ° C.). 3-methoxy-N, N′dimethylpropanamide (boiling point: 215 ° C.) and ⁇ -butyrolactone (boiling point: 204 ° C.) are preferred.
- Two or more types of the low boiling point solvent (A) and the high boiling point solvent (B) can be selected and mixed for use.
- the high-boiling solvent (B) is contained in an amount of 0.3 to 2.0% by weight based on the entire solvent contained in the composition. Most preferably, the high boiling point solvent (B) is contained in an amount of 0.5 to 1.5% by weight.
- Block copolymer As the block polymer, there are combinations of AB, ABAB, ABA, ABC and the like. As one of the methods for synthesizing a block copolymer, the polymerization process consists only of an initiation reaction and a growth reaction, and can be obtained by living radical polymerization or living cation polymerization without a side reaction that deactivates the growth terminal. The growth terminal can continue to maintain a growth active reaction during the polymerization reaction. By eliminating chain transfer, a polymer (A) having a uniform length can be obtained. By adding a different monomer (b) using the growing terminal of the polymer (A), polymerization proceeds under the monomer (b) to form a block copolymer (AB).
- AB block copolymer
- the polymer chain (A) and the polymer chain (B) have a molar ratio of 1: 9 to 9: 1, preferably 3: 7 to 7: 3. be able to.
- the volume ratio of the block copolymer used in the present invention is, for example, 30:70 to 70:30.
- Homopolymer A or B is a polymerizable compound having at least one reactive group capable of radical polymerization (vinyl group or vinyl group-containing organic group).
- the weight average molecular weight Mw of the block copolymer used in the present invention is preferably 1,000 to 100,000, or 5,000 to 100,000. If it is less than 1,000, the applicability to the base substrate may be poor, and if it is 100,000 or more, the solubility in a solvent may be poor.
- the polydispersity (Mw / Mn) of the block copolymer of the present application is preferably 1.00 to 1.50, particularly preferably 1.00 to 1.20.
- the block copolymer suitably used in the present invention comprises a silicon-free polymer containing styrene as a structural unit, which may be substituted with an organic group, or a silicon-free polymer containing a lactide-derived structure as a structural unit, and a silicon-containing group. It is a block copolymer obtained by bonding a silicon-containing polymer having a substituted styrene as a structural unit.
- a combination of a silylated polystyrene derivative and a polystyrene derivative polymer, or a combination of a silylated polystyrene derivative polymer and a polylactide is preferable.
- a combination of a silylated polystyrene derivative having a substituent at the 4-position and a polystyrene derivative polymer having a substituent at the 4-position, or a combination of a silylated polystyrene derivative polymer having a substituent at the 4-position and a polylactide is preferable.
- More preferable specific examples of the block copolymer include a combination of poly (trimethylsilylstyrene) and polymethoxystyrene, a combination of polystyrene and poly (trimethylsilylstyrene), and a combination of poly (trimethylsilylstyrene) and poly (D, L-lactide). Combinations are listed.
- block copolymer More preferable specific examples of the block copolymer include a combination of poly (4-trimethylsilylstyrene) and poly (4-methoxystyrene), a combination of polystyrene and poly (4-trimethylsilylstyrene), a poly (4-trimethylsilylstyrene) and A combination with poly (D, L-lactide) can be mentioned.
- the most preferred specific examples of block copolymers include poly (4-methoxystyrene) / poly (4-trimethylsilylstyrene) copolymers and polystyrene / poly (4-trimethylsilylstyrene) copolymers.
- the self-assembled film-forming composition may have a solid content of 0.1 to 10 mass%, or 0.1 to 5 mass%, or 0.1 to 3 mass%. Solid content is the remaining ratio which remove
- the proportion of the block copolymer in the solid content can be 30 to 100% by mass, or 50 to 100% by mass, or 50 to 90% by mass, or 50 to 80% by mass.
- the type of block present in the block copolymer can be 2 or 3 or more.
- the number of blocks present in the block copolymer can be 2 or 3 or more.
- the self-assembled film forming composition according to the present invention which contains at least a low-boiling solvent (A) having a boiling point of 160 ° C. or lower and a high-boiling solvent (B) having a boiling point of 170 ° C. or higher as a solvent, It can be made.
- a method for producing a phase separation pattern of a block copolymer according to the present invention comprises (1) a structure derived from styrene or a derivative thereof or lactide using the self-assembled film forming composition according to the present invention. Forming on the substrate a layer of a block copolymer obtained by bonding a non-silicon-containing polymer as a structural unit and a silicon-containing polymer having a styrene substituted with a silicon-containing group as a structural unit; and (2) on the substrate And a step of phase-separating the formed block copolymer layer. Before the step (1), a step of forming a lower layer film on the substrate can be further included.
- the process of forming an upper film on a block copolymer layer can be further included between the process (1) and the process (2).
- Substrate is silicon, silicon oxide, glass, surface-modified glass, plastic, ceramic, transparent substrate, flexible substrate, roll-to-roll processing And a substrate selected from the group consisting of combinations thereof.
- a silicon wafer, quartz, glass, or plastic is preferable, and a silicon wafer is more preferable.
- the semiconductor substrate is typically a silicon wafer, but an SOI (Silicon on Insulator) substrate or a compound semiconductor wafer such as gallium arsenide (GaAs), indium phosphide (InP), or gallium phosphide (GaP) is used. Also good.
- a semiconductor substrate on which an insulating film such as a silicon oxide film, a nitrogen-containing silicon oxide film (SiON film), or a carbon-containing silicon oxide film (SiOC film) is formed may be used.
- the underlayer film forming composition according to the invention is applied.
- underlayer film forming composition As the copolymer contained in the underlayer film forming composition used for phase separation of the layer containing the block copolymer formed on the substrate according to the present invention, the following various monomers are commonly used. In this method, for example, bulk polymerization, solution polymerization, suspension polymerization, or emulsion polymerization can be used to carry out copolymerization so as to obtain an appropriate molar ratio. Solution polymerization is particularly preferable. In this case, for example, a desired monomer can be added to the solvent to which an additive and a polymerization initiator have been added for polymerization.
- a copolymer is a copolymer that is not necessarily limited to a polymer compound. Therefore, monomers are excluded but oligomers are not excluded. In addition, the following monomers may be used singly or in combination of two or more. Copolymers and the like that can be suitably used in the present invention will be described below.
- Aromatic-containing vinyl compound containing no hydroxyl group The aromatic-containing vinyl compound containing no hydroxyl group referred to here is an aromatic-containing vinyl compound, but styrene containing the tert-butyl group. It is a compound that does not correspond to a compound.
- halogen atom a fluorine atom, a chlorine atom, a bromine atom and an iodine atom are preferable, and a fluorine atom and a chlorine atom are particularly preferable.
- alkyl group referred to in the present invention includes a linear, branched or cyclic alkyl group.
- linear, branched or cyclic saturated alkyl groups include methyl, ethyl, n-propyl, i-propyl, cyclopropyl, n-butyl, i-butyl, s-butyl, t- Butyl group, cyclobutyl group, 1-methyl-cyclopropyl group, 2-methyl-cyclopropyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decanyl Group, n-undecanyl group, n-dodecanyl group, n-tridecanyl group, n-tetradecanyl group, n-pentadecanyl group, 1-methyl-n-butyl group, 2-methyl-n-butyl group, 3-methyl-n -Butyl group, 1,1-dimethyl-n-propyl
- alkoxy group examples include a group in which an etheric oxygen atom (—O—) is bonded to the terminal carbon atom of the alkyl group.
- alkoxy groups include methoxy, ethoxy, n-propoxy, i-propoxy, cyclopropoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy, cyclo Butoxy group, 1-methyl-cyclopropoxy group, 2-methyl-cyclopropoxy group, n-pentoxy 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, 1,1-diethyl-n -Propoxy group, cyclopentoxy group, 1-methyl-cyclobutoxy group, 2-methyl-cyclobutoxy group, 3-methyl-cyclobutoxy group
- Examples of the amide group include a group having a hydrogen atom or the above alkyl group as R ′ and R ′′ of —CONR′R ′′.
- alkoxycarbonyl group examples include groups in which a carbonyl group (—CO—) is bonded to the terminal carbon atom of the alkoxy group.
- the structure of the alkoxycarbonyl group is preferably linear or branched.
- alkoxycarbonyl groups include methoxycarbonyl group, ethoxycarbonyl group, n-propoxycarbonyl group, isopropoxycarbonyl group, n-butoxycarbonyl group, isobutoxycarbonyl group, sec-butoxycarbonyl group, tert-butoxycarbonyl group.
- Examples of the thioalkyl group include groups in which —O— of the above alkoxy group is replaced by —S—.
- Such thioalkyl groups include methylthio, ethylthio, n-propylthio, i-propylthio, n-butylthio, i-butylthio, s-butylthio, t-butylthio, 2-methylbutylthio , N-pentylthio group, n-hexoxy group and the like.
- a more preferred aromatic-containing vinyl compound containing no hydroxyl group is 2-vinylnaphthalene.
- a compound containing a (meth) acryloyl group and not containing a hydroxyl group “(meth) acryloyl group” is a notation indicating an acryloyl group and a methacryloyl group.
- the acryloyl group refers to a group represented by CH 2 ⁇ CH—CO—
- the methacryloyl group refers to a group represented by CH 2 ⁇ C (R) —CO— (R represents a hydrocarbon group or the like).
- R 4 and R 5 are each independently a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a carbon atom optionally substituted with a halogen atom.
- R 4 and R 5 represent a straight-chain, branched or cyclic alkyl group having 1 to 10 atoms, a benzyl group, or an anthrylmethyl group.
- the “alkoxy group”, “halogen atom”, and “alkyl group” are as described above.
- Examples of the compound containing a (meth) acryloyl group and not containing a hydroxyl group include methyl (meth) acrylate, ethyl (meth) acrylate, n-hexyl (meth) acrylate, isopropyl (meth) acrylate, and cyclohexyl (meth) acrylate.
- crosslink-forming group-containing compound The crosslink-forming group is not particularly limited as long as it is a group that generates a chemical bond between molecules. For example, a hydroxy group, an epoxy group, a protected hydroxy group, or a protected group. Carboxyl group. Any number of cross-linking groups may be present in one molecule.
- hydroxy group examples include a vinyl group-containing hydroxy group derived from hydroxyalkyl (meth) acrylate, vinyl alcohol and the like, and a phenolic hydroxy group such as hydroxystyrene.
- alkyl group examples include the above alkyl groups, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, and a butyl group.
- (meth) acrylate means, of course, both methacrylate and acrylate.
- epoxy group examples include vinyl group-containing epoxy groups derived from epoxy (meth) acrylate, glycidyl (meth) acrylate, and the like.
- Examples of the protected hydroxy group include a group in which the hydroxy group of hydroxystyrene is protected with a tertiary butoxy group. Or a hydroxy group protected by reacting a phenolic hydroxy group such as hydroxystyrene with a vinyl ether compound, or a hydroxy group protected by reacting an alcoholic hydroxy group such as hydroxyethyl methacrylate with a vinyl ether compound, etc. .
- Examples of the vinyl ether compound include aliphatic groups having an alkyl chain having 1 to 10 carbon atoms and a vinyl ether group such as methyl vinyl ether, ethyl vinyl ether, isopropyl vinyl ether, normal butyl vinyl ether, 2-ethylhexyl vinyl ether, tert-butyl vinyl ether, cyclohexyl vinyl ether, and the like.
- Examples include vinyl ether compounds and cyclic vinyl ether compounds such as 2,3-dihydrofuran, 4-methyl-2,3-dihydrofuran, and 2,3-dihydro-4H-pyran.
- Examples of the protected carboxyl group include a carboxyl group protected by reacting a vinyl ether compound with a carboxyl group of (meth) acrylic acid or vinyl benzoic acid.
- Examples of the vinyl ether compound used here include the above-mentioned vinyl ether compounds.
- n X's are each independently a hydroxyl group, halogen atom, alkyl group, alkoxy group, cyano group, amide group, alkoxy group substituted on the aromatic ring.
- a carbonyl group or a thioalkyl group, n represents an integer of 1 to 7, and at least one of X is a hydroxyl group.
- R 6 represents a hydrogen atom, a hydroxyl group and / or a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms which may be substituted with a halogen atom, or a hydroxyphenyl group
- R 7 represents a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms which has a hydroxyl group and may be substituted with a halogen atom, or a hydroxyphenyl group.
- halogen atom alkyl group
- alkoxy group amide group
- alkoxycarbonyl group thioalkyl group
- 2-hydroxypropyl methacrylate 2-hydroxyethyl methacrylate, N- (4-hydroxyphenyl) methacrylamide, 2-hydroethyl acrylate, 2-hydroxypropyl methacrylate, and 4-hydroxybutyl (meth) acrylate.
- the above monomer can be produced by a conventional method, and can also be obtained as a commercial product.
- an organic peroxide or a diazo compound can be used as the polymerization initiator.
- the organic peroxide include diacyl peroxides such as diacetyl peroxide, diisobutyl peroxide, didecanoyl peroxide, benzoyl peroxide, and succinic acid peroxide; diisopropyl peroxydicarbonate, di-2-ethylhexyl peroxy Peroxydicarbonates such as dicarbonate and diallylperoxydicarbonate; peroxyesters such as tert-butylperoxyisobutyrate, tert-butylneodecanate and cumeneperoxyneodecanate; acetylcyclohexylsulfonyl peroxide And peroxide sulfonates.
- diazo compounds examples include 2,2′-azobisisobutyronitrile, 4,4′-azobis (4-cyanovaleric acid), 2,2′-azobis (4-methoxy-2,4-dimethoxyvalero). Nitrile), 2,2′-azobis (2-cyclopropylpropionitrile), and the like.
- a compound having a decomposition half-life at 80 ° C. of 10 hours or less is preferable.
- benzoyl peroxide and 2,2′-azobisisobutyronitrile are preferable.
- the amount of the polymerization initiator used is usually from 0.0001 to 0.2 equivalent, preferably from 0.0005 to 0.1 equivalent, based on the entire monomer used.
- solvent used in the present invention is not particularly limited as long as it is a solvent that does not participate in the polymerization reaction and is compatible with the polymer. Specific examples include benzene, toluene, xylene, and the like.
- Aromatic hydrocarbons Alicyclic hydrocarbons such as cyclohexane; Aliphatic hydrocarbons such as n-hexane and n-octane; Ketones such as acetone, methyl ethyl ketone and cyclohexanone; Ethers such as tetrahydrofuran and dioxane; Acetic acid Esters such as ethyl and butyl acetate; Amides such as N, N-dimethylformamide and N, N-dimethylacetamide; Sulfoxides such as dimethyl sulfoxide; Alcohols such as methanol and ethanol; Ethylene glycol monomethyl ether, Ethylene glycol monomethyl Ether acetate or propire Polyhydric alcohol derivatives such as N-glycol monomethyl ether acetate; and the like can be used. These solvents can be used singly or as a mixed solvent of two or more, and the amount used can also be appropriately selected.
- the charging molar ratio of each of the above monomers is such that (A) 25 to 90 mol%, (B) 0 to 65 mol%, (C) 0 And (D) 10 to 20 mol%, and (A) + (B) + (C) is selected so that the unit structure containing aromatic is 81 to 90 mol%.
- (A) is a unit structure derived from a styrene compound containing a tert-butyl group
- (B) is a unit structure derived from an aromatic-containing vinyl compound not containing a hydroxyl group, other than the above (A)
- (C) is a unit structure derived from a compound containing a (meth) acryloyl group and not containing a hydroxyl group
- (D) is a unit structure derived from a crosslinking group-containing compound.
- the polymerization temperature in the present invention is not particularly limited as long as it does not cause side reactions such as transfer reaction and termination reaction, and the monomer is consumed and the polymerization is completed, but it is carried out in the temperature range of ⁇ 100 ° C.
- the concentration of the monomer with respect to the solvent is not particularly limited, but is usually 1 to 40% by weight, and preferably 10 to 30% by weight.
- the polymerization reaction time can be selected as appropriate, but is usually in the range of 2 hours to 50 hours.
- the weight average molecular weight measured by the GPC (Gel Permeation Chromatography) method of the copolymer varies depending on the coating solvent used, the solution viscosity, etc., but is preferably 1,000 to 50,000, for example, in terms of polystyrene. Is from 2,000 to 20,000.
- (2.1) Copolymer component After the copolymer is isolated from the copolymer solution obtained above, it may be used for the preparation of the lower layer film-forming composition. Can be used as it is in the underlayer film forming composition.
- the underlayer film forming composition suitably used in the present invention may further contain a crosslinkable compound and a sulfonic acid compound.
- the ratio of the sulfonic acid compound to the copolymer contained in the lower layer film-forming composition suitably used in the present invention is not particularly limited, but is, for example, 0.1% by mass or more and 13% by mass or less, preferably 0.5% by mass or more. 5% by mass or less.
- the crosslinkable compound is also expressed as a crosslinking agent, and is, for example, a nitrogen-containing compound having 2 to 4 nitrogen atoms substituted with a methylol group or an alkoxymethyl group.
- the ratio of the crosslinkable compound with respect to the copolymer contained in the underlayer film forming composition suitably used in the present invention is not particularly limited, it is, for example, 5% by mass or more and 50% by mass or less.
- Preferred examples of the sulfonic acid compound include p-toluenesulfonic acid, 4-hydroxybenzenesulfonic acid, trifluoromethanesulfonic acid, pyridinium-p-toluenesulfonic acid, pyridinium-4-hydroxybenzenesulfonic acid, camphorsulfonic acid, 5 -Sulfosalicylic acid, 4-chlorobenzenesulfonic acid, 4-hydroxybenzenesulfonic acid, benzenedisulfonic acid, 1-naphthalenesulfonic acid, pyridinium-1-naphthalenesulfonic acid and the like.
- crosslinkable compound examples include hexamethoxymethyl melamine, tetramethoxymethyl glycoluril, tetramethoxymethylbenzoguanamine, 1,3,4,6-tetrakis (methoxymethyl) glycoluril, 1,3,4 4,6-tetrakis (butoxymethyl) glycoluril, 1,3,4,6-tetrakis (hydroxymethyl) glycoluril, 1,3-bis (hydroxymethyl) urea, 1,1,3,3-tetrakis (butoxy) Methyl) urea and 1,1,3,3-tetrakis (methoxymethyl) urea and the like, and tetramethoxymethylglycoluril is more preferable.
- the sulfonic acid compound acts as a crosslinking accelerator, and, for example, 4-hydroxybenzenesulfonic acid (also referred to as p-phenolsulfonic acid) suppresses the resist pattern cross section perpendicular to the substrate from becoming a footing shape, It is an additive that contributes to a desired shape (generally rectangular shape).
- the underlayer film forming composition suitably used in the present invention may contain a phenol derivative. Similar to 4-hydroxybenzenesulfonic acid, the phenol derivative is an additive that suppresses the cross section of the resist pattern perpendicular to the substrate from becoming a footing shape and contributes to a desired shape (generally rectangular shape). . Specific examples of phenol derivatives include 4-methylsulfonylphenol, bisphenol S, bisphenol AF, 4-cyanophenol, 3,4,5-trifluorophenol, 4-hydroxybenzotrifluoride, 2,3,5,6-tetra Examples thereof include fluoro-4- (trifluoromethyl) phenol and 2,6-dichloro-4- (methylsulfonyl) phenol. Although the ratio of the phenol derivative with respect to the copolymer contained in the lower layer film formation composition of this invention is not specifically limited, For example, it is 0.1 to 20 mass%.
- the underlayer film forming composition suitably used in the present invention may contain a surfactant.
- the surfactant is an additive for improving applicability to the substrate.
- Known surfactants such as nonionic surfactants and fluorosurfactants can be used, and for example 0.1 mass relative to the copolymer contained in the underlayer film forming composition suitably used in the present invention. % To 5% by mass or less.
- the solid content when the component excluding the solvent is defined as solid content, the solid content includes a copolymer and various additives as described above that are added as necessary. included.
- the concentration of the solid content in the underlayer film forming composition is, for example, 0.1% by mass to 15% by mass, preferably 0.1% by mass to 10% by mass.
- the solvent used at the time of preparation of a copolymer may be included as it is.
- the ratio of the solvent with respect to the lower layer film formation composition used suitably for this invention is not specifically limited, For example, it is 90 to 99.9 mass%.
- Step of forming lower layer film A lower layer film is formed on the substrate for neutralizing the surface energy.
- the underlayer film forming composition is applied on the substrate by a conventional means such as spin coating so as to have a predetermined film thickness, and then heated, dipped, etc., if necessary.
- underlayer film forming composition suitably used in the present invention can be performed by a conventional method, for example, by an appropriate application method such as a spinner or a coater.
- the baking conditions are appropriately selected from a baking temperature of 80 to 500 ° C., or 80 to 350 ° C., and a baking time of 0.3 to 60 minutes.
- the baking temperature is 100 ° C. to 250 ° C.
- the baking time is 0.5 to 2 minutes.
- the thickness of the lower layer film to be formed is, for example, 10 to 1000 nm, 20 to 500 nm, 50 to 300 nm, 100 to 200 nm, or 10 to 100 nm.
- a step of forming a block copolymer layer A block copolymer layer is formed on the lower layer film.
- the block copolymer layer is formed by applying a conventional method, for example, applying a self-assembled film-forming composition containing the block copolymer to a predetermined film thickness on the lower film layer by means of spin coating and baking. Can be done by.
- a lower layer film used for phase separation of the layer containing the block copolymer formed on the substrate is obtained.
- an upper film is formed on the block copolymer layer obtained above.
- the formation of the upper layer film can be performed by a known method, that is, by applying and baking the upper layer film forming composition on the lower layer film.
- the upper layer film-forming composition is applied on the block copolymer layer by a conventional means such as spin coating to form an upper layer film.
- the thickness of the upper film is not particularly limited, but is generally 3 nm to 100 nm, preferably 10 to 70 nm, and particularly preferably 20 to 60 nm. If it is 3 nm or less, a desired uniform block copolymer phase separation pattern may not be formed. If it is 100 nm or more, it may take too much time during etching, which is not preferable.
- the upper layer film-forming composition is preferably dissolved in a solvent or solvent mixture that does not damage, dissolve, or substantially swell the block copolymer.
- An upper film forming composition suitable for the practice of the present invention is an upper film forming composition used for phase separation of a layer containing a block copolymer formed on a substrate, (A) (a) a copolymer comprising a unit structure derived from a maleimide structure and a unit structure derived from a styrene structure; (B) An upper layer film-forming composition containing an ether compound having 8 to 16 carbon atoms as a solvent.
- the present composition can be used as an upper layer film-forming composition that is formed on a block copolymer thin film and then removed after the orientation of the block copolymer is controlled by heating. Even with a block copolymer layer that cannot be oriented only by heating, orientation can be achieved by using an upper layer film formed of the present composition.
- maleimide structure and “styrene structure” refer to chemical structures having maleimide and styrene as skeletons, respectively.
- Distal unit structure refers to a repeating unit that is derived from the compound having the maleimide structure or the styrene structure while maintaining the skeleton thereof and forms the main chain of the copolymer.
- the unit structure derived from the maleimide structure has the formula (1): (In the formula (1), R 11 represents a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms which may be substituted with a halogen atom. Represented).
- the unit structure derived from the styrene structure has the formula (2): (In the formula (2), R 12 to R 14 , R 17 and R 18 are each independently a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a carbon atom 1 which may be substituted with a halogen atom. Represents a linear, branched or cyclic alkyl group of ⁇ 10). R 17 and R 18 are preferably a hydrogen atom.
- the molar ratio of the unit structure represented by Formula (1) and Formula (2) to the entire copolymer (A) is based on the entire copolymer (A).
- Structural unit of formula (1) 30 to 70 mol%
- Structural unit of formula (2) 20 to 50 mol% It is desirable that
- the copolymer (A) can contain a unit structure derived from (b) (meth) acrylic group in addition to the formulas (1) and (2).
- the (meth) acryl group means both an acrylic group and a methacryl group.
- a (meth) acrylate compound means both an acrylate compound and a methacrylate compound.
- (meth) acrylic acid means acrylic acid and methacrylic acid.
- the unit structure derived from the (meth) acryl group has the formula (3):
- R 15 and R 16 are each independently a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a straight chain having 1 to 10 carbon atoms which may be substituted with a halogen atom, Represents a branched or cyclic alkyl group).
- the molar ratio of the unit structure of the formula (3) to the entire copolymer (A) is 0.1 to 50 mol%, more preferably 0.1 to 30 mol%, still more preferably relative to the entire copolymer (A). Is from 0.1 to 20 mol%, most preferably from 0.1 to 10 mol%.
- examples of the aryl group having 6 to 10 carbon atoms include a phenyl group, a benzyl group and a naphthyl group.
- the distribution of the unit structure represented by the formulas (1), (2), and (3) in the copolymer (A) is not particularly limited. That is, in the copolymer (A), the unit structures represented by the formulas (1) and (2) may be alternately copolymerized or randomly copolymerized. When the unit structure represented by the formula (3) coexists, the unit structures represented by the formulas (1), (2), and (3) in the copolymer (A) each constitute a block. Or may be combined randomly.
- the repeating number of the unit structures represented by the formulas (1), (2) and (3) in the copolymer (A) is within the range of mol% of each unit structure described above, and
- the weight average molecular weight Mw of the union (A) can be appropriately selected within the range of 5,000 to 500,000, preferably 10,000 to 100,000.
- the production method of the copolymer (A) suitable for the practice of the present invention is represented by the formula (4):
- R 11 represents a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 10 carbon atoms which may be substituted with a halogen atom.
- a compound represented by formula (5): (In the formula (5), R 12 to R 14 , R 17 and R 18 are each independently a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a carbon atom 1 which may be substituted with a halogen atom. Represents 10 to 10 linear, branched or cyclic alkyl groups.)
- a step of copolymerizing a monomer mixture containing a compound represented by the formula: R 17 and R 18 are preferably a hydrogen atom.
- the monomer mixture optionally includes formula (6): (In Formula (6), R 15 and R 16 are each independently a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, or a straight chain having 1 to 10 carbon atoms which may be substituted with a halogen atom, Represents a branched or cyclic alkyl group.)
- the compound represented by these can be mix
- alkyl group “aryl group”, “alkoxy group”, and “halogen atom” are as described above.
- the monomer mixture is The compound represented by Formula (4) and Formula (5) is used with respect to the entire copolymer (A).
- the monomer mixture is based on the entire copolymer (A).
- the copolymer (A) can be obtained by a known polymerization method.
- Known polymerization methods include radical polymerization, anionic polymerization, and cationic polymerization.
- Various known techniques such as solution polymerization, suspension polymerization, emulsion polymerization, and bulk polymerization can be used.
- 2,2′-azobis isobutyronitrile
- 1,1′-azobis 1,1′-azobis (cyclohexane-1-carbonitrile), 1-[(1-cyano-1-methylethyl) azo] formamide
- 2,2′- Azobis 2,2′- Azobis (2 Methylpropionamidine) dihydrochloride and the
- Solvents used during polymerization include dioxane, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol, propylene glycol monomethyl ether, propylene glycol monomethyl ether Acetate, propylene glycol propyl ether acetate, toluene, xylene, methyl ethyl ketone, cyclopentanone, cyclohexanone, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, ethyl ethoxyacetate, ethyl hydroxyacetate, 2-hydroxy-3-methylbutane Methyl acid, 3-meth Use of methyl cypropionate, ethyl 3-methoxypropionate, ethyl 3-e
- the reaction conditions are 50 ° C. to 200 ° C., and a stirring reaction is performed for 1 hour to 48 hours, whereby a copolymer (A) suitable for the practice of the present invention is obtained.
- the solution containing the copolymer (A) thus obtained can be used as it is for the preparation of the upper layer film-forming composition.
- the copolymer (A) can also be recovered by precipitation by precipitation in a poor solvent such as methanol, ethanol, isopropanol, water, or a mixed solvent thereof.
- the copolymer (A) After isolating the copolymer (A), it may be used by re-dissolving in the ether compound having 8 to 16 carbon atoms as described below, or after drying. Desirable drying conditions are 30 to 100 ° C. for 6 to 48 hours in an oven or the like. After recovering the copolymer (A), it can be redissolved in an ether compound having 8 to 16 carbon atoms described below to prepare a composition suitable for the practice of the present invention, and can be used as an upper film-forming composition. .
- the weight average molecular weight of the copolymer (A) suitable for the practice of the present invention varies depending on the coating solvent used, the solution viscosity, etc., but in terms of polystyrene. For example, it is 5,000 to 500,000, preferably 10,000 to 100,000.
- the solvent used in the composition suitable for the practice of the present invention is an ether compound having 8 to 16 carbon atoms. More specifically, an ether compound having 8 to 16 carbon atoms (hereinafter sometimes referred to as “ether solvent”) used as a solvent in a composition suitable for the practice of the present invention is represented by the following formula ( 7).
- a 1 and A 2 each independently represent a linear, branched or cyclic saturated alkyl group having 1 to 15 carbon atoms which may be substituted.
- preferred solvents include dibutyl ether, diisobutyl ether, di-tert-butyl ether, dipentyl ether, which have an excellent balance between the solubility of copolymer (A) and the insolubility of block copolymers suitable for the practice of the present invention.
- examples thereof include diisoamyl ether, dihexyl ether, dioctyl ether, and cyclopentyl methyl ether.
- Dibutyl ether, diisobutyl ether, and diisoamyl ether are particularly preferable, and diisoamyl ether is particularly preferable.
- These ether solvents can be used alone or as a mixture.
- the following organic solvents may be mixed with the ether solvent.
- the solvent include those mentioned in the section of the production method for the copolymer (A).
- the solvent other than the ether solvent may be present in a ratio of 0.01 to 13% by mass with respect to the ether solvent.
- the upper layer film-forming composition suitable for the practice of the present invention can further contain additives such as surfactants and rheology modifiers.
- rheology modifiers can be added to the upper layer film-forming composition suitable for the practice of the present invention.
- the rheology modifier is added mainly for the purpose of improving the fluidity of the composition suitable for the practice of the present invention.
- phthalic acid derivatives such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, and butyl isodecyl phthalate; Mention may be made of maleic acid derivatives such as normal butyl maleate, diethyl maleate and dinonyl maleate, oleic acid derivatives such as methyl oleate, butyl oleate and tetrahydrofurfuryl oleate, or stearic acid derivatives such as normal butyl stearate and glyceryl stearate. it can.
- These rheology modifiers are usually blended at a ratio of less than 30% by mass with respect to 100% by mass of the entire composition suitable for the practice of the present invention.
- a surfactant can be blended in order to further improve the applicability to surface unevenness.
- the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, polyoxyethylene nonyl Polyoxyethylene alkyl aryl ethers such as phenol ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate Sorbitan fatty acid esters such as rate, polyoxyethylene sorbitan monolaurate, polyoxyethylene Nonionic surfactants such as polyoxyethylene
- the blending amount of these surfactants is usually 0.2% by mass or less, preferably 0.1% by mass or less, based on 100% by mass of the entire upper layer film-forming composition suitable for the practice of the present invention.
- These surfactants may be added alone or in combination of two or more.
- the content of the copolymer (A) in the solid content in the composition is preferably 20% by mass or more, for example, 20 to 100% by mass, or 30 to 100% by mass.
- the solid content of the composition suitable for the practice of the present invention is preferably 0.1 to 50% by mass, more preferably 0.3 to 30% by mass.
- the solid content is obtained by removing the solvent component from the upper layer film-forming composition.
- the copolymer (A), an ether compound having 8 to 16 carbon atoms as a solvent, and, if necessary, the above additives are mixed according to the above composition, for example, stirred at room temperature to 40 ° C.
- An upper layer film-forming composition suitable for the above can be produced.
- Step of phase-separating the block copolymer layer The phase separation of the block copolymer layer is performed by a treatment that causes rearrangement of the block copolymer material in the presence of the upper layer film, for example, ultrasonic treatment, solvent treatment, thermal annealing, etc. be able to. In many applications it is desirable to achieve phase separation of the block copolymer layer simply by heating or so-called thermal annealing.
- Thermal annealing can be performed under atmospheric pressure, reduced pressure, or pressurized conditions in the air or in an inert gas.
- the conditions for the thermal annealing are not particularly limited, but are preferably 180 ° C. to 300 ° C., particularly preferably 190 to 240 ° C., and most preferably 210 ° C. in the atmosphere.
- the treatment time is not particularly limited, but is usually 1 to 30 minutes, preferably 3 to 10 minutes.
- a block copolymer domain oriented substantially perpendicular to the substrate or lower layer film surface is formed.
- the form of the domain is, for example, lamellar, spherical or cylindrical.
- the domain interval is, for example, 50 nm or less. According to the method of the present invention, it is possible to form a structure having a desired size, shape, orientation and periodicity.
- the upper layer film can be peeled after phase separation of the block copolymer layer. Peeling can be performed using, for example, a solvent or a mixture of solvents (peeling solvent) that does not damage, dissolve, or substantially swell the block copolymer.
- peeling solvent a solvent or a mixture of solvents (peeling solvent) that does not damage, dissolve, or substantially swell the block copolymer.
- the peeled upper layer film composition can be isolated and reused. Isolation can be carried out by a conventional means such as precipitation or distillation.
- the block copolymer layer phase-separated by the above-described method can be further subjected to a step of etching it. Usually, a part of the phase-separated block copolymer is removed before etching. Etching can be performed by known means. This method can be used for the manufacture of semiconductor substrates.
- a method for manufacturing a semiconductor device includes: (1) Using the self-assembled film forming composition according to the present invention, on a substrate, a styrene or a derivative thereof or a silicon-free polymer having a structure derived from lactide as a structural unit, and styrene substituted with a silicon-containing group Forming a layer of a block copolymer obtained by bonding a silicon-containing polymer having a structural unit of (2) a step of phase-separating the block copolymer layer formed on the substrate; (3) etching the phase-separated block copolymer layer; and (4) etching the substrate; including.
- a step of forming a lower layer film on the substrate can be further included.
- the process of forming an upper film on a block copolymer layer can be further included between the process (1) and the process (2).
- Etching includes, for example, tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, carbon monoxide, argon, oxygen, nitrogen, sulfur hexafluoride Gases such as difluoromethane, nitrogen trifluoride and chlorine trifluoride, chlorine, trichloroborane and dichloroborane can be used. A halogen-based gas is preferably used, more preferably a fluorine-based gas.
- fluorine-based gas examples include tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), and perfluoropropane (C 3 F 8), trifluoromethane, and difluoromethane (CH 2 F 2), and the like.
- phase-separated block copolymer layer pattern formed using the upper layer film-forming composition according to the present invention a desired shape is imparted to the substrate to be processed by etching, and a suitable semiconductor device is manufactured. Is possible.
- the weight average molecular weight (Mw) of the polymer is a measurement result by a gel permeation chromatography (GPC) method.
- GPC gel permeation chromatography
- a GPC apparatus manufactured by Tosoh Corporation is used, and the measurement conditions are as follows.
- Measuring device HLC-8020GPC [trade name] (manufactured by Tosoh Corporation)
- GPC column TSKgel G2000HXL; 2, G3000HXL: 1, G4000HXL; 1 [trade name] (all manufactured by Tosoh Corporation)
- Solvent tetrahydrofuran (THF)
- Flow rate 1.0 ml / min Standard sample: Polystyrene (manufactured by Tosoh Corporation)
- solvents used in the following examples are as follows. Propylene glycol monomethyl ether acetate (boiling point 146 ° C) n-Butyl acetate (boiling point 126 ° C) N-methylpyrrolidone (boiling point 204 ° C) Diethylene glycol monomethyl ether (boiling point 193 ° C) N, N-dimethylisobutyramide (boiling point 175 ° C) 3-Methoxy-N, N′dimethylpropanamide (boiling point 215 ° C.)
- the lower layer film-forming composition obtained above was applied onto a silicon wafer and heated on a hot plate at 240 ° C. for 1 minute to obtain a lower layer film (A layer).
- a solution 1 of the self-assembled film-forming composition was applied thereon with a spin coater and heated on a hot plate at 100 ° C. for 1 minute to form a self-assembled film (B layer) having a thickness of 40 nm.
- the composition for forming the upper layer film of the self-assembled film was applied by a spinner, followed by heating at 210 ° C. for 5 minutes on a hot plate to induce a microphase separation structure of the block copolymer.
- FIG. 1 shows the arrangement of each layer.
- the silicon wafer in which the microphase-separated structure is induced is etched for 30 seconds using an etching apparatus (Lam 2300 Versys Kiyo45) manufactured by Lam Research and using O 2 gas as an etching gas, thereby removing the upper layer film.
- the polymethoxystyrene region was preferentially etched, and then the shape was observed with an electron microscope (S-4800) (FIG. 2).
- Examples 2 to 4 Other than using N-methylpyrrolidone as the high boiling point solvent of the solution of the self-assembled film forming composition, diethylene glycol monomethyl ether, N, N-dimethylisobutyramide, 3-methoxy-N, N′dimethylpropanamide was used. In the same manner as in Example 1, sample preparation (solutions 2 to 4) and formation of a microphase-separated structure of the block copolymer were carried out.
- Example 5 A sample was prepared in the same manner as in Example 1 except that a mixed solvent of 48.265 g of propylene glycol monomethyl ether acetate and 0.735 g of N-methylpyrrolidone was used as the solvent of the solution of the self-assembled film forming composition ( Formation of microphase-separated structures of solution 5) and block copolymer was carried out.
- Example 6 to 9 Sample preparation (solution) was carried out in the same manner as in Examples 1 to 4, except that n-butyl acetate was used instead of propylene glycol monomethyl ether acetate as the low boiling point solvent of the solution of the self-assembled film-forming composition. 6-9) and formation of microphase-separated structures of block copolymers were carried out.
- Comparative Example 2 In the same manner as in Comparative Example 1 except that n-butyl acetate was used instead of propylene glycol monomethyl ether acetate as a solvent for the solution of the self-assembled film-forming composition, sample preparation (solution 11) and Formation of a microphase-separated structure of the block copolymer was carried out.
- Comparative Example 3 The same as in Comparative Example 1 except that 47.775 g of propylene glycol monomethyl ether acetate and 1.225 g of N-methylpyrrolidone were used in place of propylene glycol monomethyl ether acetate as a solvent for the solution of the self-assembled film-forming composition. According to the method, sample preparation (solution 12) and formation of a microphase-separated structure of the block copolymer were carried out.
- the lower layer film-forming composition obtained above was applied onto a silicon wafer and heated on a hot plate at 240 ° C. for 1 minute to obtain a lower layer film (A layer).
- a solution 13 of the self-assembled film-forming composition was applied thereon with a spin coater and heated on a hot plate at 210 ° C. for 5 minutes to induce a microphase separation structure of the block copolymer.
- the silicon wafer in which the microphase separation structure is induced is preferentially given a polymethyl methacrylate region by etching for 5 seconds using O 2 gas as an etching gas using an etching apparatus (Lam 2300 Versys Kiyo 45) manufactured by Lam Research. Etching was performed, and the shape was observed with an electron microscope (S-4800).
- Comparative Example 6 Comparative Example 4 except that instead of propylene glycol monomethyl ether acetate, a mixed solvent of 0.245 g of N-methylpyrrolidone and 48.755 g of propylene glycol monomethyl ether acetate was used as a solvent for the solution of the self-assembled film-forming composition. Sample preparation (solution 14) and formation of a microphase-separated structure of the block copolymer were carried out in the same manner as described above.
- the self-assembled film produced using the self-assembled film composition of the present invention contains silicon composed of poly (4-methoxystyrene) and poly (4-trimethylsilylstyrene).
- the single solvent composition of the block copolymer it is possible to induce the entire surface of the coating film to be perpendicular to the substrate, regardless of the firing temperature at which microphase-separated alignment occurs.
- the alignment was not improved and similar results were not obtained.
- the present invention it becomes possible to induce a microphase separation structure of a layer containing a block copolymer on the entire surface of a coating film perpendicularly to a substrate without causing a poor arrangement of the microphase separation of the block copolymer. Very useful.
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Abstract
Description
[1] ブロックコポリマーと、溶媒として沸点の異なる少なくとも2種類の溶媒、とを含む自己組織化膜形成組成物であって、
上記ブロックコポリマーが、有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーであり、
上記溶媒が、沸点160℃以下の低沸点溶媒(A)と、170℃以上の高沸点溶媒(B)とを含む、自己組織化膜形成組成物。
[2] 上記組成物が含む溶媒全体に対して、高沸点溶媒(B)を0.3~2.0重量%含む、[1]に記載の組成物。
[3] (1)[1]又は[2]に記載の自己組織化膜形成組成物を用いて、ブロックコポリマー層を基板上に形成する工程、及び
(2)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
を含み、
上記ブロックコポリマーが、有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーである、
ブロックコポリマーの相分離パターン製造方法。
[4] さらに上記(1)工程の前に、基板上に下層膜を形成する工程を含む、[3]に記載の製造方法。
[5] さらに上記(1)工程と上記(2)の工程の間に、ブロックコポリマー層上に上層膜を形成する工程を含む、[3]に記載の製造方法。
[6] (1)[1]又は[2]に記載の自己組織化膜形成組成物を用いて、基板上にブロックコポリマー層を形成する工程、
(2)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
(3)前記相分離したブロックコポリマー層をエッチングする工程、及び、
(4)前記基板をエッチングする工程、
を含み、
上記ブロックコポリマーが、有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーである、
半導体装置の製造方法。
[7] 有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーと、
溶媒として少なくとも沸点160℃以下の低沸点溶媒(A)と、170℃以上の高沸点溶媒(B)、とを含む自己組織化膜形成組成物
を用いて、ブロックコポリマーを自己組織化させる方法。
・ ブロックコポリマーと、溶媒として沸点の異なる少なくとも2種類の溶媒を含む、自己組織化膜形成組成物であって、
上記ブロックコポリマーが、スチレンもしくはその誘導体又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマーとを結合させたブロックコポリマーであり、
上記溶媒が、沸点160℃以下の低沸点溶媒(A)と、170℃以上の高沸点溶媒(B)とを含む、自己組織化膜形成組成物、
・ 上記自己組織化膜形成組成物を用いたブロックコポリマーを自己組織化させる方法、及びブロックコポリマーの相分離パターン製造方法、並びに
・ 半導体装置の製造方法
が提供される。以下に順に説明する。
1.1.溶媒
本発明に係る自己組織化膜形成組成物は、溶媒として沸点の異なる少なくとも2種類の溶媒を含み、少なくともその一種は沸点160℃以下の低沸点溶媒(A)から選択され、少なくとも他の一種は沸点170℃以上の高沸点溶媒(B)から選択される。
ここで言う沸点とは、1気圧で測定された沸点を言う。
n-ペンタン、i-ペンタン、n-ヘキサン、i-ヘキサン、n-ヘプタン、i-ヘプタン、2,2,4-トリメチルペンタン、n-オクタン、i-オクタン、シクロヘキサン、メチルシクロヘキサン等の脂肪族炭化水素系溶媒;
ベンゼン、トルエン、キシレン、エチルベンゼン、トリメチルベンゼン、メチルエチルベンゼン、n-プロピルベンセン、i-プロピルベンセン、ジエチルベンゼン、i-ブチルベンゼン、トリエチルベンゼン、ジ-i-プロピルベンセン、n-アミルナフタレン、トリメチルベンゼン等の芳香族炭化水素系溶媒;
メタノール、エタノール、n-プロパノール、i-プロパノール、n-ブタノール、i-ブタノール、sec-ブタノール、t-ブタノール、n-ペンタノール、i-ペンタノール、2-メチルブタノール、sec-ペンタノール、t-ペンタノール、3-メトキシブタノール、n-ヘキサノール、2-メチルペンタノール、sec-ヘキサノール、2-エチルブタノール、sec-ヘプタノール、ヘプタノール-3、n-オクタノール、2-エチルヘキサノール、sec-オクタノール、n-ノニルアルコール、2,6-ジメチルヘプタノール-4、n-デカノール、sec-ウンデシルアルコール、トリメチルノニルアルコール、sec-テトラデシルアルコール、sec-ヘプタデシルアルコール、フェノール、シクロヘキサノール、メチルシクロヘキサノール、3,3,5-トリメチルシクロヘキサノール、ベンジルアルコール、フェニルメチルカルビノール、ジアセトンアルコール、クレゾール等のモノアルコール系溶媒;
エチレングリコール、プロピレングリコール、1,3-ブチレングリコール、ペンタンジオール-2,4、2-メチルペンタンジオール-2,4、ヘキサンジオール-2,5、ヘプタンジオール-2,4、2-エチルヘキサンジオール-1,3、ジエチレングリコール、ジプロピレングリコール、トリエチレングリコール、トリプロピレングリコール、グリセリン等の多価アルコール系溶媒;
アセトン、メチルエチルケトン、メチル-n-プロピルケトン、メチル-n-ブチルケトン、ジエチルケトン、メチル-i-ブチルケトン、メチル-n-ペンチルケトン、エチル-n-ブチルケトン、メチル-n-ヘキシルケトン、ジ-i-ブチルケトン、トリメチルノナノン、シクロヘキサノン、メチルシクロヘキサノン、2,4-ペンタンジオン、アセトニルアセトン、ジアセトンアルコール、アセトフェノン、フェンチョン等のケトン系溶媒;
エチルエーテル、i-プロピルエーテル、n-ブチルエーテル、n-ヘキシルエーテル、2-エチルヘキシルエーテル、エチレンオキシド、1,2-プロピレンオキシド、ジオキソラン、4-メチルジオキソラン、ジオキサン、ジメチルジオキサン、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ジエチルエーテル、エチレングリコールモノ-n-ブチルエーテル、エチレングリコールモノ-n-ヘキシルエーテル、エチレングリコールモノフェニルエーテル、エチレングリコールモノ-2-エチルブチルエーテル、エチレングリコールジブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコールジエチルエーテル、ジエチレングリコールモノ-n-ブチルエーテル、ジエチレングリコールジ-n-ブチルエーテル、ジエチレングリコールモノ-n-ヘキシルエーテル、エトキシトリグリコール、テトラエチレングリコールジ-n-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、プロピレングリコールモノエチルエーテル、プロピレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノエチルエーテル、ジプロピレングリコールモノプロピルエーテル、ジプロピレングリコールモノブチルエーテル、トリプロピレングリコールモノメチルエーテル、テトラヒドロフラン、2-メチルテトラヒドロフラン等のエーテル系溶媒;
ジエチルカーボネート、酢酸メチル、酢酸エチル、γ-ブチロラクトン、γ-バレロラクトン、酢酸n-プロピル、酢酸i-プロピル、酢酸n-ブチル、酢酸i-ブチル、酢酸sec-ブチル、酢酸n-ペンチル、酢酸sec-ペンチル、酢酸3-メトキシブチル、酢酸メチルペンチル、酢酸2-エチルブチル、酢酸2-エチルヘキシル、酢酸ベンジル、酢酸シクロヘキシル、酢酸メチルシクロヘキシル、酢酸n-ノニル、アセト酢酸メチル、アセト酢酸エチル、酢酸エチレングリコールモノメチルエーテル、酢酸エチレングリコールモノエチルエーテル、酢酸ジエチレングリコールモノメチルエーテル、酢酸ジエチレングリコールモノエチルエーテル、酢酸ジエチレングリコールモノ-n-ブチルエーテル、酢酸プロピレングリコールモノメチルエーテル、酢酸プロピレングリコールモノエチルエーテル、酢酸プロピレングリコールモノプロピルエーテル、酢酸プロピレングリコールモノブチルエーテル、酢酸ジプロピレングリコールモノメチルエーテル、酢酸ジプロピレングリコールモノエチルエーテル、ジ酢酸グリコール、酢酸メトキシトリグリコール、プロピオン酸エチル、プロピオン酸n-ブチル、プロピオン酸i-アミル、シュウ酸ジエチル、シュウ酸ジ-n-ブチル、乳酸メチル、乳酸エチル、乳酸n-ブチル、乳酸n-アミル、マロン酸ジエチル、フタル酸ジメチル、フタル酸ジエチル等のエステル系溶媒;
N-メチルホルムアミド、N,N-ジメチルホルムアミド、N,N-ジエチルホルムアミド、アセトアミド、N-メチルアセトアミド、N,N-ジメチルアセトアミド、N-メチルプロピオンアミド、N-メチルピロリドン等の含窒素系溶媒;
硫化ジメチル、硫化ジエチル、チオフェン、テトラヒドロチオフェン、ジメチルスルホキシド、スルホラン、1,3-プロパンスルトン等の含硫黄系溶媒
等を挙げることができる。
沸点170℃以上の高沸点溶媒(B)としては、例えば、N-メチルピロリドン(沸点:204℃)、ジエチレングリコールモノメチルエーテル(沸点:193℃)、N,N-ジメチルイソブチルアミド(沸点:175℃)、3-メトキシ-N,N’ジメチルプロパンアミド(沸点:215℃)、γ-ブチロラクトン(沸点:204℃)が好ましい。
低沸点溶媒(A)、高沸点溶媒(B)はそれぞれ二種以上を選択、混合して使用することもできる。
好ましい態様としては、上記組成物が含む溶媒全体に対して、高沸点溶媒(B)を0.3~2.0重量%含む。最も好ましくは、高沸点溶媒(B)を0.5~1.5重量%含む。
ブロックポリマーとしてはAB、ABAB、ABA、ABC等の組み合わせがある。
ブロックコポリマーを合成する方法の一つとして、重合過程が開始反応と成長反応のみからなり、成長末端を失活させる副反応を伴わないリビングラジカル重合、リビングカチオン重合によって得られる。成長末端は重合反応中に成長活性反応を保ち続けることができる。連鎖移動を生じなくすることで長さの揃ったポリマー(A)が得られる。このポリマー(A)の成長末端を利用して違うモノマー(b)を添加することにより、このモノマー(b)のもとで重合が進行しブロックコポリマー(AB)を形成することができる。
本願発明に用いられるブロックコポリマーの体積比率は例えば30:70~70:30である。
ホモポリマーA、又はBは、ラジカル重合可能な反応性基(ビニル基又はビニル基含有有機基)を少なくとも一つ有する重合性化合物である。
本願のブロックコポリマーの多分散度(Mw/Mn)は、好ましくは1.00~1.50であり、特に好ましくは1.00~1.20である。
これらの中でも、シリル化ポリスチレン誘導体とポリスチレン誘導体ポリマーとの組み合わせ、又はシリル化ポリスチレン誘導体ポリマーとポリラクチドの組み合わせが好ましい。
これらの中でも、置換基を4位に有するシリル化ポリスチレン誘導体と置換基を4位に有するポリスチレン誘導体ポリマーとの組み合わせ、又は置換基を4位に有するシリル化ポリスチレン誘導体ポリマーとポリラクチドの組み合わせが好ましい。
ブロックコポリマーのより好ましい具体例としては、ポリ(トリメチルシリルスチレン)とポリメトキシスチレンとの組み合わせ、ポリスチレンとポリ(トリメチルシリルスチレン)との組み合わせ、ポリ(トリメチルシリルスチレン)とポリ(D,L-ラクチド)との組み合わせが挙げられる。
ブロックコポリマーのより好ましい具体例としては、ポリ(4-トリメチルシリルスチレン)とポリ(4-メトキシスチレン)との組み合わせ、ポリスチレンとポリ(4-トリメチルシリルスチレン)との組み合わせ、ポリ(4-トリメチルシリルスチレン)とポリ(D,L-ラクチド)との組み合わせが挙げられる。
ブロックコポリマーの最も好ましい具体例としては、ポリ(4-メトキシスチレン)/ポリ(4-トリメチルシリルスチレン)コポリマー及びポリスチレン/ポリ(4-トリメチルシリルスチレン)コポリマーが挙げられる。
自己組織化膜形成組成物は固形分0.1~10質量%、又は0.1~5質量%、又は0.1~3質量%とすることができる。固形分は膜形成組成物中から溶剤を除いた残りの割合である。
固形分中に占めるブロックコポリマーの割合は、30~100質量%、又は50~100質量%、又は50~90質量%、又は50~80質量%にすることができる。
ブロックコポリマー中に存在するブロックの種類が2又は3以上とすることができる。そして、ブロックコポリマー中に存在するブロック数が2又は3以上とすることができる
溶媒として少なくとも沸点160℃以下の低沸点溶媒(A)と、170℃以上の高沸点溶媒(B)とを含む、本発明に係る自己組織化膜形成組成物
を用いて、ブロックコポリマーを自己組織化させることができる。
本発明に係るブロックコポリマーの相分離パターン製造方法は、(1)本発明に係る自己組織化膜形成組成物を用いて、スチレンもしくはその誘導体又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマーとを結合させたブロックコポリマーの層を基板上に形成する工程、及び(2)前記基板上に形成されたブロックコポリマー層を相分離させる工程を含む。
上記(1)工程の前に、基板上に下層膜を形成する工程を更に含めることができる。
また、上記(1)工程と上記(2)の工程の間に、ブロックコポリマー層上に上層膜を形成する工程を更に含めることができる。
以下では、
[1]基板上に下層膜を形成する工程、
[2]ブロックコポリマーの層を形成する工程、
[3]上層膜を形成する工程、
[4]ブロックコポリマー層を相分離させる工程
の順で説明する。
[1.1]基板
基板は、ケイ素、酸化ケイ素、ガラス、表面修飾ガラス、プラスチック、セラミック、透明基材、可撓性基材、ロールツーロール加工において使用される基材及びこれらの組み合わせからなる群より選択される基材で構成される。好ましくは、シリコンウェハー、石英、ガラス、又はプラスチックであり、より好ましくはシリコンウェハーである。半導体基板は、代表的にはシリコンウェハーであるが、SOI(Silicon on Insulator)基板、または砒化ガリウム(GaAs)、リン化インジウム(InP)、リン化ガリウム(GaP)などの化合物半導体ウェハーを用いてもよい。酸化珪素膜、窒素含有酸化珪素膜(SiON膜)、炭素含有酸化珪素膜(SiOC膜)などの絶縁膜が形成された半導体基板を用いてもよく、その場合には、その絶縁膜上に本発明に係る下層膜形成組成物を塗布する。
本発明に係る基板上に形成したブロックコポリマーを含む層を相分離させるために用いられる下層膜形成組成物に含まれる共重合体は、下記各種モノマーを慣用の方法、例えば、塊状重合、溶液重合、懸濁重合、または乳化重合により、適切なモル比となるよう共重合させることにより製造することができる。溶液重合が特に好ましく、その場合には、例えば、添加剤及び重合開始剤を付加した溶媒に、所望のモノマーを添加して重合することができる。
また、下記モノマーは、それぞれ一種ずつを使用してもよいが、二種以上使用することもできる。
本発明において好適に使用できる共重合体等について以下に説明する。
(1.1)モノマー
(1.1.1)tert-ブチル基を含有するスチレン化合物
tert-ブチル基はスチレンの芳香環上に置換しており、tert-ブチル基の数は1乃至5個である。
好ましくは、下記式(1’)で表される化合物である。
より好ましくは、4-tert-ブチルスチレンである。
ここにいうヒドロキシル基を含有しない芳香族含有ビニル化合物は、芳香族含有ビニル化合物であるが、上記tert-ブチル基を含有するスチレン化合物には該当しない化合物である。
好ましくは、下記式(4’-1)及び(4’-2)で表される化合物である。
より好ましいヒドロキシル基を含有しない芳香族含有ビニル化合物は、2-ビニルナフタレンである。
「(メタ)アクリロイル基」とは、アクリロイル基とメタクリロイル基とを示す表記である。アクリロイル基とはCH2=CH-CO-で表される基をいい、メタクリロイル基とはCH2=C(R)-CO-で表される基(Rは炭化水素基等)をいう。
好ましくは、下記式(5’-1)及び(5’-2)で表される化合物である。
「アルコキシ基」、「ハロゲン原子」、「アルキル基」については上記したとおりである。
架橋形成基は分子間に化学結合を生成する基であれば特に限定されないが、例えば、ヒドロキシ基、エポキシ基、保護されたヒドロキシ基、又は保護されたカルボキシル基とすることができる。架橋形成基は一分子中にいくつあってもよい。
R6は、水素原子、水酸基及び/又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐もしくは環状アルキル基、又はヒドロキシフェニル基を表し、
R7は、水酸基を有し、ハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐もしくは環状アルキル基、又はヒドロキシフェニル基を表す。)
重合開始剤としては、有機過酸化物、ジアゾ系化合物を使用することができる。
有機過酸化物としては例えば、ジアセチルパ-オキサイド、ジイソブチルパーオキサイド、ジデカノイルパーオキサイド、ベンゾイルパーオキサイド、スクシン酸パーオキサイド等のジアシルパーオキサイド類;ジイソプロピルパーオキシジカーボネート、ジ-2-エチルヘキシルパーオキシジカーボネート、ジアリルパーオキシジカーボネート等のパーオキシジカーボネート類;tert-ブチルパーオキシイソブチレート、tert-ブチルネオデカネート、クメンパーオキシネオデカネート等のパーオキシエステル類;アセチルシクロヘキシルスルホニルパーオキシド等の過酸化スルホネート類が挙げられる。
本発明に用いられる溶剤は、重合反応に関与せず、かつ重合体と相溶性のある溶剤であれば特に制限されず、具体的には、ベンゼン、トルエン、キシレンなどの芳香族炭化水素類;シクロヘキサンなどの脂環族炭化水素類;n-ヘキサン、n-オクタンなどの脂肪族炭化水素類;アセトン、メチルエチルケトン、シクロヘキサノンなどのケトン類;テトラヒドロフラン、ジオキサンなどのエーテル類;酢酸エチル、酢酸ブチルなどのエステル類;N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミドなどのアミド類;ジメチルスルホキシドなどのスルホキシド類;メタノール、エタノールなどのアルコール類;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メチルエーテルアセテートやプロピレングリコールモノメチルエーテルアセテートなど多価アルコール誘導体類;などを使用することができる。これらの溶剤は、1種単独で、又は2種以上の混合溶剤として用いることができ、その使用量も、適宜選択することができる。
上記各モノマーの仕込みモル比は、得られる共重合体全体に対する共重合比が、(A)25~90モル%、(B)0~65モル%、(C)0~65モル%、(D)10~20モル%であり、且つ(A)+(B)+(C)の内、芳香族を含む単位構造が81~90モル%となるように選択する。ここで、(A)はtert-ブチル基を含有するスチレン化合物に由来する単位構造、(B)はヒドロキシル基を含有しない芳香族含有ビニル化合物に由来する単位構造であって、上記(A)以外の単位構造、(C)は(メタ)アクリロイル基を含有し、ヒドロキシル基を含有しない化合物に由来する単位構造、(D)は架橋形成基含有化合物に由来する単位構造である。本発明における重合温度は、移動反応や停止反応などの副反応が起こらず、モノマーが消費され重合が完結する温度範囲であれば特に制限されないが、-100℃以上溶媒沸点以下の温度範囲で行なわれることが好ましい。また、モノマーの溶媒に対する濃度は、特に制限されないが、通常、1~40重量%であり、10~30重量%であることが好ましい。重合反応させる時間は適宜選択できるが、通常2時間乃至50時間の範囲である。
かくして、本発明において好適に使用できる共重合体が得られる。
以上のようにして得られる共重合体に、添加剤を添加し、適切な溶媒に溶解すれば、本発明に係る下層膜形成組成物が得られる。
上記で得られる共重合体溶液から共重合体を単離した後、下層膜形成組成物の調製に使用してもよいが、上記で得られる共重合体溶液をそのまま下層膜形成組成物に使用することもできる。
本発明に好適に用いられる下層膜形成組成物は、架橋性化合物及びスルホン酸化合物をさらに含むことができる。本発明に好適に用いられる下層膜形成組成物に含まれる共重合体に対するスルホン酸化合物の割合は特に限定されないが、例えば0.1質量%以上13質量%以下、好ましくは0.5質量%以上5質量%以下である。架橋性化合物は架橋剤とも表現され、例えばメチロール基またはアルコキシメチル基で置換された窒素原子を2乃至4つ有する含窒素化合物である。本発明に好適に用いられる下層膜形成組成物に含まれる共重合体に対する架橋性化合物の割合は特に限定されないが、例えば5質量%以上50質量%以下である。
前記固形分の下層膜形成組成物中における濃度は、例えば0.1質量%~15質量%、好ましくは0.1質量%~10質量%である。
本発明に好適に用いられる下層膜形成組成物に含まれる溶媒の具体例として、プロピレングリコールモノメチルエーテル(PGME)、プロピレングリコールモノメチルエーテルアセテート(PGMEA)、プロピレングリコールモノプロピルエーテル、メチルエチルケトン、乳酸エチル、シクロヘキサノン、N,N-2-トリメチルプロピオンアミド、γ-ブチロラクトン、N-メチルピロリドン、2-ヒドロキシイソ酪酸メチル、3-エトキシプロピオン酸エチル、これらの溶媒から選択された2種以上の混合物などが挙げられる。なお、共重合体の調製時に用いた溶剤がそのまま含まれていても良い。
本発明に好適に用いられる下層膜形成組成物に対する溶媒の割合は特に限定されないが、例えば90質量%以上99.9質量%以下である。
表面エネルギー中和のため、基板上に下層膜が形成される。下層膜形成組成物は、基板の上にスピンコーティング等の慣用の手段により所定の膜厚となるように適用された後、必要により加熱、浸漬等が施される。
下層膜上にブロックコポリマー層を形成する。ブロックコポリマー層の形成は、慣用の方法、例えば、ブロックコポリマーを含む自己組織化膜形成組成物をスピンコーティング等の手段により下膜層上に所定の膜厚となるように適用し、焼成することによって行うことができる。
かくして、基板上に形成したブロックコポリマーを含む層を相分離させるために用いられる下層膜が得られる。
任意選択的に、上記で得られたブロックコポリマー層上に上層膜が形成される。上層膜の形成は、周知の方法、すなわち、上層膜形成組成物の下層膜上への塗布及び焼成によって行うことができる。
[上層膜形成組成物]
本発明の実施に好適な上層膜形成組成物は、基板上に形成したブロックコポリマーを含む層を相分離させるために用いられる上層膜形成組成物であって、
(A)(a)マレイミド構造に由来する単位構造及びスチレン構造に由来する単位構造を含む共重合体と、
(B)溶剤として、炭素原子数8乃至16のエーテル化合物
とを含む、上層膜形成組成物である。
本組成物は、ブロックコポリマー薄膜上に製膜し、加熱により上記ブロックコポリマーの配向を制御した後、除去する上層膜形成組成物として使用することができる。加熱するだけでは配向することができないブロックコポリマー層に対しても、本組成物により形成される上層膜を用いれば配向が可能となる。
[(a)マレイミド構造に由来する単位構造及びスチレン構造に由来する単位構造を含む共重合体]
本明細書において、「マレイミド構造」及び「スチレン構造」とはそれぞれ、マレイミド及びスチレンを骨格とする化学構造をいう。「由来する単位構造」とは、前記マレイミド構造又はスチレン構造を有する化合物からその骨格を維持しつつ誘導される、共重合体の主鎖をなす繰返し単位をいう。
(式(1)中、R11は、水素原子、炭素原子数1~10の直鎖、分岐若しくは環状アルキル基、又はハロゲン原子で置換されていてもよい炭素原子数6~10のアリール基を表す)で表される。
(式(2)中、R12~R14、R17及びR18はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)で表される。R17及びR18は好ましくは水素原子である。
式(1)の構造単位:30乃至70モル%
式(2)の構造単位:20乃至50モル%
であることが望ましい。
さらに前記共重合体(A)は、式(1)及び式(2)に加え、(b)(メタ)アクリル基に由来する単位構造を含むことができる。
本発明において、(メタ)アクリル基とは、アクリル基とメタクリル基の両方を意味する。(メタ)アクリレート化合物とは、アクリレート化合物とメタクリレート化合物の両方を意味する。例えば(メタ)アクリル酸は、アクリル酸とメタクリル酸を意味する。
本発明の実施に好適な共重合体(A)の製造方法は、式(4):
(式(4)中、R11は、水素原子、炭素原子数1~10の直鎖、分岐若しくは環状アルキル基、又はハロゲン原子で置換されていてもよい炭素原子数6~10のアリール基を表す)で表される化合物と、式(5):
で表される化合物を含むモノマー混合物を共重合させる工程を含む。R17及びR18は好ましくは水素原子である。
(式(6)中、R15及びR16はそれぞれ独立に、水素原子、炭素原子数1~5のアルコキシ基、又はハロゲン原子で置換されていてもよい炭素原子数1~10の直鎖、分岐若しくは環状アルキル基を表す。)
で表される化合物を配合することができる。
式(4)及び式(5)で表される化合物を、共重合体(A)全体に対し、
式(4)で表される化合物:30乃至70モル%
式(5)で表される化合物:20乃至50モル%
の割合で含むことが好ましい。
式(4)で表される化合物:30乃至70モル%
式(5)で表される化合物:20乃至50モル%
式(6)で表される化合物:0.1乃至40モル%
の割合で含むことが好ましい。
本発明の実施に好適な組成物に使用される溶剤は、炭素原子数8乃至16のエーテル化合物である。より具体的には、本発明の実施に好適な組成物に溶剤として使用される炭素原子数8~16のエーテル化合物(以下において、「エーテル系溶剤」と称する場合がある)は以下の式(7)で表される。
式(7)中、A1とA2は各々独立して、置換されていてもよい炭素原子数1~15の直鎖、分岐又は環状飽和アルキル基を表す。
本発明の実施に好適な上層膜形成組成物は、更に界面活性剤、レオロジー調整剤などの添加剤を含むことができる。
ブロックコポリマー層の相分離は、上層膜の存在下に、ブロックコポリマー材料の再配列をもたらす処理、例えば、超音波処理、溶媒処理、熱アニール等によって行うことができる。多くの用途において、単純に加熱またはいわゆる熱アニールによりブロックコポリマー層の相分離を達成することが望ましい。熱アニールは、大気中又は不活性ガス中において、常圧、減圧又は加圧条件下で行うことができる。
熱アニールの条件としては特に限定されないが、大気下で180℃~300℃が好ましく、190~240℃が特に好ましく、210℃が最も好ましい。
上記処理時間は特に限定されないが、通常1~30分、好ましくは3~10分である。
上記した方法により相分離したブロックコポリマー層は、更にこれをエッチングする工程に供することができる。通常は、エッチング前に、相分離したブロックコポリマーの一部を除去しておく。エッチングは公知の手段によって行うことができる。この方法は、半導体基板の製造のために用いることができる。
(1)本発明に係る自己組織化膜形成組成物を用いて、基板上に、スチレンもしくはその誘導体又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマーとを結合させたブロックコポリマーの層を形成する工程、
(2)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
(3)前記相分離したブロックコポリマー層をエッチングする工程、及び、
(4)前記基板をエッチングする工程、
を含む。
上記(1)工程の前に、基板上に下層膜を形成する工程を更に含めることができる。
また、上記(1)工程と上記(2)の工程の間に、ブロックコポリマー層上に上層膜を形成する工程を更に含めることができる。
測定装置:HLC-8020GPC〔商品名〕(東ソー株式会社製)
GPCカラム:TSKgel G2000HXL;2本、 G3000HXL:1本、G4000HXL;1本〔商品名〕(全て東ソー株式会社製)
カラム温度:40°C
溶媒:テトラヒドロフラン(THF)
流量:1.0ml/分
標準試料:ポリスチレン(東ソー株式会社製)
プロピレングリコールモノメチルエーテルアセテート(沸点146℃)
n-ブチルアセテート(沸点126℃)
N-メチルピロリドン(沸点204℃)
ジエチレングリコールモノメチルエーテル(沸点193℃)
N,N-ジメチルイソブチルアミド(沸点175℃)
3-メトキシ-N,N’ジメチルプロパンアミド(沸点215℃)
(自己組織化膜形成組成物の調製)
プロピレングリコールモノメチルエーテルアセテート48.755gとN-メチルピロリドン0.245gにブロックコポリマーであるポリ(4-メトキシスチレン)/ポリ(4-トリメチルシリルスチレン)コポリマー(重量平均分子量Mw=30,200、多分散度=1.12、体積比率50:50)1.00gを溶解させ、2質量%溶液とした後、孔径0.02μmのポリエチレン製ミクロフィルターを用いて濾過し、ブロックコポリマーからなる自己組織化膜形成組成物の溶液1を調製した。
4-tert-ブチルスチレン、2-ビニルナフタレン及び2-ヒドロキシプロピルメタクリレートから得た樹脂0.45g(モル比率30:55:15)と1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.14gとp-トルエンスルホン酸ピリジニウム塩0.01gとを、プロピレングリコールモノメチルエーテルアセテート139.58とプロピレングリコールモノメチルエーテル59.82gとの混合溶媒に溶解させ、0.30質量%の溶液とした。その後、孔径0.2μmのポリエチレン製ミクロフィルターを用いてろ過し、自己組織化膜の下層膜形成組成物の溶液を調製した。
N-シクロヘキシルマレイミド、4-tert-ブチルスチレン及びtert-ブチルメタクリレートから得た共重合ポリマー0.25g(モル比率50:30:20)を、ジイソアミルエーテル9.75gに溶解させ、2.5質量%の溶液とした。その後、孔径0.2μmのポリエチレン製ミクロフィルターを用いてろ過し、自己組織化膜の上層膜形成組成物の溶液を調製した。
上記で得られた下層膜形成組成物をシリコンウェハー上に塗布し、ホットプレート上で240℃、1分間加熱することにより下層膜(A層)を得た。その上に自己組織化膜形成組成物の溶液1をスピンコーターにより塗布し、ホットプレート上で100℃にて1分間加熱し、膜厚40nmの自己組織化膜(B層)を形成した。その上に自己組織化膜の上層膜形成組成物をスピナーにより塗布し、続いてホットプレート上で210℃にて5分間加熱し、ブロックコポリマーのミクロ相分離構造を誘起させた。図1に各層の配置を示す。
ミクロ相分離構造を誘起させたシリコンウェハーはラム・リサーチ社製エッチング装置(Lam 2300 Versys Kiyo45)を用い、エッチングガスとしてO2ガスを使用して30秒間エッチングすることで、上層膜を除去するとともにポリメトキシスチレン領域を優先的にエッチングし、続いて電子顕微鏡(S-4800)で形状を観察した(図2)。
自己組織化膜形成組成物の溶液の高沸点溶媒にN-メチルピロリドンを使用する代わりにジエチレングリコールモノメチルエーテル、N,N-ジメチルイソブチルアミド、3-メトキシ-N,N’ジメチルプロパンアミドを用いた以外は、実施例1と同様の方法により、試料の調製(溶液2~4)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
自己組織化膜形成組成物の溶液の溶媒にプロピレングリコールモノメチルエーテルアセテート48.265gとN-メチルピロリドン0.735gの混合溶媒を用いた以外は、実施例1と同様の方法により、試料の調整(溶液5)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
自己組織化膜形成組成物の溶液の低沸点溶媒にプロピレングリコールモノメチルエーテルアセテートを使用する代わりにn-ブチルアセテートを用いた以外は、実施例1~4と同様の方法により、試料の調製(溶液6~9)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
(自己組織化膜形成組成物の調製)
プロピレングリコールモノメチルエーテルアセテート50.00gにブロックコポリマーであるポリ(4-メトキシスチレン)/ポリ(4-トリメチルシリルスチレン)コポリマー(重量平均分子量Mw=30,200、多分散度=1.12、体積比率50:50)1.00gを溶解させ、2質量%溶液とした後、孔径0.02μmのポリエチレン製ミクロフィルターを用いて濾過し、ブロックコポリマーからなる自己組織化膜形成組成物の溶液10を調製した。
(自己組織化膜形成組成物の自己組織化評価)
自己組織化膜形成組成物の溶液1の代わりに上記溶液10を用いた以外は、実施例1と同様の方法により、試料の調製およびブロックコポリマーのミクロ相分離構造の形成を実施した。
自己組織化膜形成組成物の溶液の溶媒としてプロピレングリコールモノメチルエーテルアセテートを使用する代わりに、n-ブチルアセテートを用いた以外は、比較例1と同様の方法により、試料の調製(溶液11)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
自己組織化膜形成組成物の溶液の溶媒としてプロピレングリコールモノメチルエーテルアセテートを使用する代わりにプロピレングリコールモノメチルエーテルアセテート47.775gとN-メチルピロリドン1.225gを用いた以外は、比較例1と同様の方法により、試料の調製(溶液12)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
(自己組織化膜形成組成物の調製)
プロピレングリコールモノメチルエーテルアセテート49.00gにブロックコポリマーであるポリスチレン/ポリメチルメタクリレートコポリマー(重量平均分子量Mw=33,000、多分散度=1.08、体積比率50:50)1.00gを溶解させ、2質量%溶液とした後、孔径0.02μmのポリエチレン製ミクロフィルターを用いて濾過し、ブロックコポリマーからなる自己組織化膜形成組成物の溶液13を調製した。
2-ビニルナフタレン、ベンジルメタクリレート及び2-ヒドロキシプロピルメタクリレートから得た樹脂0.45g(モル比率50:35:15)と1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.14gとp-トルエンスルホン酸ピリジニウム塩0.01gとを、プロピレングリコールモノメチルエーテルアセテート139.58とプロピレングリコールモノメチルエーテル59.82gとの混合溶媒に溶解させ、0.30質量%の溶液とした。その後、孔径0.2μmのポリエチレン製ミクロフィルターを用いてろ過し、自己組織化膜の下層膜形成組成物の溶液を調製した。
上記で得られた下層膜形成組成物をシリコンウェハー上に塗布し、ホットプレート上で240℃、1分間加熱することにより下層膜(A層)を得た。その上に自己組織化膜形成組成物の溶液13をスピンコーターにより塗布し、ホットプレート上で210℃にて5分間加熱し、ブロックコポリマーのミクロ相分離構造を誘起させた。
ミクロ相分離構造を誘起させたシリコンウェハーはラム・リサーチ社製エッチング装置(Lam 2300 Versys Kiyo45)を用い、エッチングガスとしてO2ガスを使用して5秒間エッチングすることで、ポリメチルメタクリレート領域を優先的にエッチングし、続いて電子顕微鏡(S-4800)で形状を観察した。
自己組織化膜形成組成物の加熱を210℃/5分で実施していた代わりに、180℃/5分に変更した以外は、比較例4と同様の方法により、試料の調製(溶液13)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
自己組織化膜形成組成物の溶液の溶媒として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代わりに、N-メチルピロリドン0.245gとプロピレングリコールモノメチルエーテルアセテート48.755gとの混合溶媒を用いた以外は、比較例4と同様の方法により、試料の調製(溶液14)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
自己組織化膜形成組成物の加熱を210℃/5分で実施していた代わりに、180℃/5分に変更した以外は、比較例6と同様の方法により、試料の調製(溶液14)およびブロックコポリマーのミクロ相分離構造の形成を実施した。
上記実施例1~9および比較例1~7にて調製した下層膜の架橋性およびブロックコポリマーの配列性について確認した。結果を表1及び図2(全面垂直ラメラ配列)および図3、4(部分的な垂直ラメラ配列)に示す。
Claims (7)
- ブロックコポリマーと、溶媒として沸点の異なる少なくとも2種類の溶媒、とを含む自己組織化膜形成組成物であって、
上記ブロックコポリマーが、有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーであり、
上記溶媒が、沸点160℃以下の低沸点溶媒(A)と、170℃以上の高沸点溶媒(B)とを含む、自己組織化膜形成組成物。 - 上記組成物が含む溶媒全体に対して、高沸点溶媒(B)を0.3~2.0重量%含む、請求項1に記載の組成物。
- (1)請求項1又は2に記載の自己組織化膜形成組成物を用いて、ブロックコポリマー層を基板上に形成する工程、及び
(2)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
を含み、
上記ブロックコポリマーが、有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーである、
ブロックコポリマーの相分離パターン製造方法。 - さらに上記(1)工程の前に、基板上に下層膜を形成する工程を含む、請求項3に記載の製造方法。
- さらに上記(1)工程と上記(2)の工程の間に、ブロックコポリマー層上に上層膜を形成する工程を含む、請求項3に記載の製造方法。
- (1)請求項1又は2に記載の自己組織化膜形成組成物を用いて、基板上にブロックコポリマー層を形成する工程、
(2)前記基板上に形成されたブロックコポリマー層を相分離させる工程、
(3)前記相分離したブロックコポリマー層をエッチングする工程、及び、
(4)前記基板をエッチングする工程、
を含み、
上記ブロックコポリマーが、有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーである、
半導体装置の製造方法。 - 有機基で置換されていてもよいスチレンもしくはその誘導体を構成単位とするケイ素非含有ポリマー又はラクチド由来の構造を構成単位とするケイ素非含有ポリマーと、ケイ素含有基で置換されたスチレンを構成単位とするケイ素含有ポリマー、とを結合させたブロックコポリマーと、
溶媒として少なくとも沸点160℃以下の低沸点溶媒(A)と、170℃以上の高沸点溶媒(B)、とを含む自己組織化膜形成組成物
を用いて、ブロックコポリマーを自己組織化させる方法。
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