WO2017191767A1 - 特定の架橋剤を含む保護膜形成組成物及びそれを用いたパターン形成方法 - Google Patents
特定の架橋剤を含む保護膜形成組成物及びそれを用いたパターン形成方法 Download PDFInfo
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- WO2017191767A1 WO2017191767A1 PCT/JP2017/016043 JP2017016043W WO2017191767A1 WO 2017191767 A1 WO2017191767 A1 WO 2017191767A1 JP 2017016043 W JP2017016043 W JP 2017016043W WO 2017191767 A1 WO2017191767 A1 WO 2017191767A1
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- WIPO (PCT)
- Prior art keywords
- group
- protective film
- formula
- hydrogen peroxide
- crosslinking agent
- Prior art date
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- 235000010988 polyoxyethylene sorbitan tristearate Nutrition 0.000 description 1
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- 239000002244 precipitate Substances 0.000 description 1
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- 235000011071 sorbitan monopalmitate Nutrition 0.000 description 1
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- 150000003512 tertiary amines Chemical class 0.000 description 1
- LPSKDVINWQNWFE-UHFFFAOYSA-M tetrapropylazanium;hydroxide Chemical compound [OH-].CCC[N+](CCC)(CCC)CCC LPSKDVINWQNWFE-UHFFFAOYSA-M 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- GPHXJBZAVNFMKX-UHFFFAOYSA-M triethyl(phenyl)azanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)C1=CC=CC=C1 GPHXJBZAVNFMKX-UHFFFAOYSA-M 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- RKBCYCFRFCNLTO-UHFFFAOYSA-N triisopropylamine Chemical compound CC(C)N(C(C)C)C(C)C RKBCYCFRFCNLTO-UHFFFAOYSA-N 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- HADKRTWCOYPCPH-UHFFFAOYSA-M trimethylphenylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C1=CC=CC=C1 HADKRTWCOYPCPH-UHFFFAOYSA-M 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- JOYRKODLDBILNP-UHFFFAOYSA-N urethane group Chemical group NC(=O)OCC JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
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Definitions
- the present invention relates to a composition for forming a protective film excellent in resistance to a basic aqueous hydrogen peroxide solution in a lithography process. Furthermore, the present invention relates to a method for forming a pattern by applying the protective film.
- a lithography process is known in which a resist underlayer film is provided between a substrate and a resist film formed thereon to form a resist pattern having a desired shape.
- a conventional resist underlayer film for example, a resist underlayer film formed from a composition containing an aminoplast-based crosslinking agent described in Patent Document 1, is inferior in resistance to a basic hydrogen peroxide solution. For this reason, such a resist underlayer film cannot be used as a mask in an etching process using a basic aqueous hydrogen peroxide solution.
- Patent Document 2 listed below protects a compound having a protected carboxyl group, a compound having a group capable of reacting with a carboxyl group, and a composition for forming an underlayer film for lithography containing a solvent, or a group capable of reacting with a carboxyl group.
- a composition for forming a lower layer film for lithography containing a compound having a carboxyl group and a solvent is described, and the composition does not contain an aminoplast-based crosslinking agent as an essential component.
- Patent Document 2 has no description or suggestion about the resistance of the resist underlayer film formed from the composition to the basic aqueous hydrogen peroxide solution.
- Patent Document 3 listed below describes a pattern formation method using a resist underlayer film having resistance to a basic hydrogen peroxide aqueous solution.
- the composition for forming the resist underlayer film includes a polymer having an epoxy group having a weight average molecular weight of 1000 to 100,000 and a solvent.
- An object of this invention is to provide the novel composition for forming the protective film which has the tolerance with respect to basic hydrogen peroxide aqueous solution, and the pattern formation method using the said protective film.
- the inventor of the present invention has found a combination of a specific cross-linking agent excluding an aminoplast-based cross-linking agent and a compound having a weight average molecular weight of 800 or more containing a substituent that reacts with the specific cross-linking agent.
- a specific cross-linking agent excluding an aminoplast-based cross-linking agent and a compound having a weight average molecular weight of 800 or more containing a substituent that reacts with the specific cross-linking agent.
- At least one group selected from the group consisting of glycidyl group, terminal epoxy group, epoxycyclopentyl group, epoxycyclohexyl group, oxetanyl group, vinyl ether group, isocyanate group and blocked isocyanate group is 1
- a basic aqueous hydrogen peroxide solution comprising a cross-linking agent having two or more in the molecule, a compound having a group represented by the following formula (1) at a side chain or terminal and having a weight average molecular weight of 800 or more, and an organic solvent Is a protective film forming composition.
- X 1 represents a substituent that reacts with the crosslinking agent
- R 0 represents a direct bond or an alkylene group having 1 or 2 carbon atoms
- X 2 represents an alkyl group having 1 or 2 carbon atoms
- a represents an integer of 0 to 2
- b represents an integer of 1 to 3
- -R 0 -X 1 The groups represented may be different from each other
- c represents an integer of 0 to 4
- when c represents 2, 3 or 4 the groups represented by X 2 may be different from each other, and b and c are 1 ⁇ (b + c) ⁇ 5 is satisfied.
- the protective film-forming composition has a group represented by the following formula (2) instead of a compound having a group represented by the formula (1) at a side chain or a terminal and having a weight average molecular weight of 800 or more. It may contain a compound having a weight average molecular weight of 800 or more in the side chain or terminal.
- R 1 represents a direct bond or a linear or branched alkylene group having 1 to 8 carbon atoms
- X 1 represents a substituent that reacts with the crosslinking agent.
- the substituent X 1 that reacts with the crosslinking agent represents a group containing a group that reacts directly with the crosslinking agent or a group that reacts directly with the crosslinking agent. Further, the group that directly reacts with the crosslinking agent may include a group having a protecting group and reacting with the crosslinking agent when the protecting group is removed.
- the substituent X 1 that reacts with the cross-linking agent is, for example, the following formula (3), formula (4), formula (5), formula (6), formula (7), formula (8), formula (9), formula (10) or a group represented by formula (11).
- R 2 represents a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms
- R 3 represents a hydrogen atom or a linear, branched or cyclic group having 1 to 8 carbon atoms.
- the substituent X 1 that reacts with the crosslinking agent is preferably a group represented by the formula (3), formula (5), or formula (6).
- the amount of the crosslinking agent added is, for example, when the substituent X 1 reacting with the crosslinking agent in the compound having a weight average molecular weight of 800 or more is 100 mol%, the substituent X 1 is 20 mol%. An amount that can be sealed to 150 mol%.
- the cross-linking agent preferably has two or more glycidyl groups, terminal epoxy groups or epoxycyclohexyl groups in one molecule.
- the blocked isocyanate group is, for example, a group represented by the following formula (11) or formula (12). (Wherein R 4 and R 5 each independently represents an alkyl group having 1 to 5 carbon atoms, R 6 represents an alkyl group having 1 to 5 carbon atoms, d represents an integer of 1 to 3; When R represents 2 or 3, the alkyl group having 1 to 5 carbon atoms represented by R 6 may be different from each other.)
- the protective film forming composition of the present invention may further contain a crosslinking catalyst.
- the protective film-forming composition of the present invention may further contain a surfactant.
- a protective film is formed on a semiconductor substrate on which an inorganic film may be formed using the protective film-forming composition for the basic aqueous hydrogen peroxide solution of the first aspect of the present invention.
- Forming a resist pattern on the protective film, dry-etching the protective film using the resist pattern as a mask to expose the surface of the inorganic film or the semiconductor substrate, and using the protective film after dry etching as a mask A pattern forming method in which the inorganic film or the semiconductor substrate is wet-etched and washed using a basic hydrogen peroxide solution.
- the basic hydrogen peroxide aqueous solution contains, for example, ammonia, sodium hydroxide, potassium hydroxide, sodium cyanide, potassium cyanide, triethanolamine, or urea.
- the basic aqueous hydrogen peroxide solution may be, for example, 25% by mass to 30% by mass ammonia aqueous solution (A), 30% by mass to 36% by mass hydrogen peroxide aqueous solution.
- volume ratio of the aqueous hydrogen peroxide solution (B) to the aqueous ammonia solution (A): (B) / (A) is, for example, 0.1 to 20.0, and
- the volume ratio (C) / (A) of the water (C) to the aqueous ammonia solution (A) is, for example, 1.0 to 50.0.
- the protective film formed from the protective film-forming composition of the present invention has resistance to a basic aqueous hydrogen peroxide solution.
- a protective film formed from a protective film-forming composition using a crosslinking agent having two or more glycidyl groups, terminal epoxy groups, or epoxycyclohexyl groups in one molecule is superior to a basic aqueous hydrogen peroxide solution.
- the protective film formed from the protective film-forming composition of the present invention can be used as a mask in an etching process and a cleaning process using a basic aqueous hydrogen peroxide solution.
- the protective film-forming composition of the present invention comprises a compound having a group represented by the formula (1) or a group represented by the formula (2) at a side chain or a terminal and having a weight average molecular weight of 800 or more.
- the weight average molecular weight of the compound is a value obtained by gel permeation chromatography (GPC) using polystyrene as a standard sample.
- the upper limit of the weight average molecular weight is, for example, 500,000.
- the compound having a weight average molecular weight of 800 or more is not limited to a polymer, and may be one kind selected from the group consisting of monomers, dimers, trimers and oligomers, or a mixture of two or more kinds.
- the polymer may be a copolymer (copolymer) or a homopolymer (homopolymer).
- Examples of the group represented by the formula (1) include groups represented by the following formulas (1-1) to (1-111).
- Examples of the group represented by the formula (2) include groups represented by the following formulas (2-1) to (2-28).
- the compound having a weight average molecular weight of 800 or more may further have an absorption site having absorption at a wavelength of 193 nm or an absorption site having absorption at a wavelength of 248 nm.
- the absorption site having absorption at a wavelength of 193 nm include a benzene ring, naphthalene ring, triazine ring, and isocyanuric ring.
- Examples of the absorption site having absorption at a wavelength of 248 nm include naphthalene ring, anthracene ring, and triazine ring. Can be mentioned.
- the protective film forming composition of the present invention comprises at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group.
- a cross-linking agent having two or more in one molecule.
- the cross-linking agent may have one or more of the above groups in one molecule, or may have, for example, two of the above groups in one molecule (two in total). Good.
- a compound having at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group and an epoxycyclohexyl group in one molecule for example, tris (2,3-epoxypropyl) isocyanate Nurate, 1,4-butanediol diglycidyl ether, glycerol triglycidyl ether, diethylene glycol diglycidyl ether, diglycidyl 1,2-cyclohexanedicarboxylate, 1,2-epoxy-4- (epoxyethyl) cyclohexane, 4,4'- Methylenebis [N, N-bis (oxiranylmethyl) aniline], trimethylolpropane triglycidyl ether, bisphenol-A-diglycidyl ether, TEPIC (registered trademark) -L, TEPI manufactured by Nissan Chemical Industries, Ltd.
- a polymer can be used as a compound having at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, and an epoxycyclohexyl group in one molecule.
- any polymer having at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, and an epoxycyclohexyl group can be used without particular limitation. be able to.
- Such a polymer can be produced by addition polymerization using an addition polymerizable monomer having an epoxy group, or a reaction between a polymer compound having a hydroxyl group and a compound having an epoxy group such as epichlorohydrin or glycidyl tosylate.
- polyglycidyl acrylate, a copolymer of glycidyl methacrylate and ethyl methacrylate, an addition polymerization polymer such as a copolymer of glycidyl methacrylate, styrene and 2-hydroxyethyl methacrylate, and a polycondensation polymer such as epoxy novolac can be given.
- the weight average molecular weight of the polymer is, for example, 1000 to 200,000.
- a polymer can be used as a compound having two or more oxetanyl groups in one molecule.
- any polymer having two or more oxetanyl groups in one molecule can be used without particular limitation.
- Such a polymer can be produced by addition polymerization using an addition polymerizable monomer having an oxetanyl group.
- the weight average molecular weight of the polymer is, for example, 1000 to 200,000.
- Examples of the compound having two or more vinyl ether groups in one molecule include 1,3,5-tris (4-vinyloxybutyl) trimellitate and bis (4-vinyloxybutyl) isophthalate.
- a polymer can be used as a compound having two or more vinyl ether groups in one molecule.
- any polymer having two or more vinyl ether groups in one molecule can be used without particular limitation.
- Such a polymer can be produced by addition polymerization using an addition polymerizable monomer having a vinyl ether group.
- the weight average molecular weight of the polymer is, for example, 1000 to 200,000.
- Examples of the compound having two or more isocyanate groups in one molecule include, for example, Bernock [registered trademark] D-750, D-800, DN-920, DN-950, DN-950, DN-manufactured by DIC Corporation. 955, DN-980, DN-981, Takenate [registered trademark] 500, 600, D-110N, D-120N, D-120N, D-140N, D-165N, D, manufactured by Mitsui Chemicals, Inc. -170N and D-177N.
- a polymer can be used as a compound having two or more isocyanate groups in one molecule.
- the polymer any polymer having two or more isocyanate groups in one molecule can be used without particular limitation.
- Such a polymer can be produced by addition polymerization using an addition polymerizable monomer having an isocyanate group.
- the weight average molecular weight of the polymer is, for example, 1000 to 200,000.
- a polymer can be used as a compound having two or more blocked isocyanate groups in one molecule.
- any polymer having two or more blocked isocyanate groups in one molecule can be used without particular limitation.
- Such a polymer can be produced by addition polymerization using an addition polymerizable monomer having a blocked isocyanate group.
- the weight average molecular weight of the polymer is, for example, 1000 to 200,000.
- the amount of the crosslinking agent added is, for example, when the substituent X 1 reacting with the crosslinking agent in the compound having a weight average molecular weight of 800 or more is 100 mol%, the substituent X 1 is 20 mol. % To 150 mol%, preferably 40 mol% to 140 mol%, more preferably 60 mol% to 120 mol%.
- the content of the crosslinking agent in the protective film-forming composition of the present invention is too small or excessive, resistance of the formed protective film to a resist solvent or a basic hydrogen peroxide aqueous solution can be obtained. It may be difficult.
- the protective film-forming composition of the present invention can contain a crosslinking catalyst as an optional component in order to promote the crosslinking reaction.
- a crosslinking catalyst in addition to an acidic compound and a basic compound, a compound capable of generating an acid or a base by heat can be used.
- a sulfonic acid compound or a carboxylic acid compound can be used as the acidic compound, and a thermal acid generator can be used as the compound that generates an acid by heat.
- sulfonic acid compound or carboxylic acid compound examples include p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium-p-toluenesulfonate, salicylic acid, camphorsulfonic acid, 5-sulfosalicylic acid, 4-chlorobenzenesulfonic acid, 4-hydroxybenzene.
- thermal acid generator examples include K-PURE (registered trademark) CXC-1612, CXC-1614, TAG-2172, TAG-2179, TAG-2678, and TAG2689 (above, manufactured by King Industries), And SI-45, SI-60, SI-80, SI-100, SI-110, SI-150 (above, manufactured by Sanshin Chemical Industry Co., Ltd.).
- These crosslinking catalysts can be used alone or in combination of two or more.
- an amine compound or an ammonium hydroxide compound can be used, and urea can be used as a compound in which a base is generated by heat.
- amine compounds include triethanolamine, tributanolamine, trimethylamine, triethylamine, trinormalpropylamine, triisopropylamine, trinormalbutylamine, tri-tert-butylamine, trinormaloctylamine, triisopropanolamine, phenyldiethanolamine, stearyl.
- examples include diethanolamine and tertiary amines such as diazabicyclooctane, and aromatic amines such as pyridine and 4-dimethylaminopyridine.
- primary amines such as benzylamine and normal butylamine
- secondary amines such as diethylamine and dinormalbutylamine are also exemplified as amine compounds.
- ammonium hydroxide compound examples include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, benzyltrimethylammonium hydroxide, benzyltriethylammonium hydroxide, cetyltrimethylammonium hydroxide, Examples thereof include phenyltrimethylammonium hydroxide and phenyltriethylammonium hydroxide.
- generates an amine by heating can be used, for example.
- urea, benzyltrimethylammonium chloride, benzyltriethylammonium chloride, benzyldimethylphenylammonium chloride, benzyldodecyldimethylammonium chloride, benzyltributylammonium chloride, and choline chloride are also examples of compounds that generate a base by heat.
- the content thereof is, for example, 0.2% by mass to 20% with respect to the content of the compound having a weight average molecular weight of 800 or more contained in the protective film-forming composition. % By mass.
- the protective film-forming composition of the present invention can contain a surfactant as an optional component in order to improve applicability to a semiconductor substrate.
- a surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene Polyoxyethylene alkylaryl ethers such as nonylphenyl ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan trioleate Sorbitan fatty acid esters such as stearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene Nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters such as stearate
- surfactants can be used alone or in combination of two or more.
- the content thereof is, for example, 0.01% by mass with respect to the content of the compound having a weight average molecular weight of 800 or more contained in the protective film-forming composition. Thru
- the protective film-forming composition of the present invention can be prepared by dissolving the above components in an organic solvent, and is used in a uniform solution state.
- the organic solvent include 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 monoethyl ether, propylene glycol monomethyl ether, Propylene glycol monomethyl ether acetate, propylene glycol propyl ether acetate, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, cycloheptanone, 4-methyl-2-pentanol, methyl 2-hydroxyisobutyrate, 2- Ethyl hydroxyisobutyrate, eth
- the prepared protective film-forming composition is preferably used after being filtered using, for example, a filter having a pore size of 0.2 ⁇ m or 0.1 ⁇ m and / or a filter of 0.01 ⁇ m.
- the semiconductor substrate to which the protective film forming composition of the present invention is applied examples include silicon wafers, germanium wafers, and compound semiconductor wafers such as gallium arsenide, indium phosphide, gallium nitride, indium nitride, and aluminum nitride.
- the inorganic film is formed by, for example, ALD (atomic layer deposition) method, CVD (chemical vapor deposition) method, reactive sputtering method, ion plating method, vacuum deposition. And spin coating (spin-on-glass: SOG).
- the inorganic film examples include a polysilicon film, a silicon oxide film, a silicon nitride film, a BPSG (Boro-Phospho Silicate Glass) film, a titanium nitride film, a titanium nitride oxide film, a tungsten film, a gallium nitride film, and a gallium arsenide film. Is mentioned.
- the protective film forming composition of the present invention is applied onto such a semiconductor substrate by an appropriate application method such as a spinner or a coater. Then, a protective film is formed by baking using heating means such as a hot plate.
- the baking conditions are appropriately selected from a baking temperature of 100 ° C. to 400 ° C. and a baking time of 0.3 minutes to 60 minutes.
- the baking temperature is 120 ° C. to 350 ° C.
- the baking time is 0.5 minutes to 30 minutes
- the baking temperature is 150 ° C. to 300 ° C.
- the baking time is 0.8 minutes to 10 minutes.
- the film thickness of the protective film to be formed is, for example, 0.001 ⁇ m to 10 ⁇ m, preferably 0.002 ⁇ m to 1 ⁇ m, more preferably 0.005 ⁇ m to 0.5 ⁇ m.
- the temperature at the time of baking is lower than the above range, crosslinking is insufficient, and the resistance of the formed protective film to the resist solvent or the basic hydrogen peroxide aqueous solution may be difficult to obtain.
- the protective film may be decomposed by heat.
- the resist pattern is formed by a general method, that is, a photoresist solution is applied onto the protective film, and pre-baking, exposure, post-exposure baking (abbreviated as PEB) (if necessary), development, and rinsing. it can.
- PEB post-exposure baking
- the photoresist solution used for forming the resist pattern is not particularly limited as long as it is sensitive to light used for exposure, and a positive photoresist can be used.
- a chemically amplified photoresist comprising a binder having a group that decomposes with an acid to increase the alkali dissolution rate and a photoacid generator, a low-molecular compound that decomposes with an acid to increase the alkali dissolution rate of the photoresist, and an alkali-soluble binder
- Chemically amplified photoresist comprising a photoacid generator, binder having a group that decomposes with acid to increase alkali dissolution rate, and low molecular weight compound that decomposes with acid to increase alkali dissolution rate of photoresist and photoacid generation
- a chemically amplified photoresist made of an agent, and a DNQ-novolak-type non-chemically amplified photoresist utilizing a difference in alkali dissolution rate between an exposed portion and an unexposed portion.
- Examples thereof include Sumitomo Chemical Co., Ltd., trade name: PAR710, Tokyo Ohka Kogyo Co., Ltd., trade name: TDUR-P3435LP, THMR-iP1800 and Shin-Etsu Chemical Co., Ltd., trade name: SEPR430.
- a positive photoresist a negative photoresist can be used.
- the exposure is performed through a mask (reticle) for forming a predetermined pattern, and for example, i-line, KrF excimer laser, ArF excimer laser, EUV (extreme ultraviolet) or EB (electron beam) is used.
- a mask for example, i-line, KrF excimer laser, ArF excimer laser, EUV (extreme ultraviolet) or EB (electron beam) is used.
- an alkali developer is used, and the development temperature is appropriately selected from 5 ° C. to 50 ° C. and the development time of 10 seconds to 300 seconds.
- alkali developer examples include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, aqueous solutions of quaternary ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, and ethanolamine. And alkaline aqueous solutions such as amine aqueous solutions such as propylamine and ethylenediamine. Further, a surfactant or the like can be added to these developers.
- a method of developing with an organic solvent such as butyl acetate and developing a portion of the photoresist where the alkali dissolution rate is not improved can be used.
- the protective film is dry etched using the formed resist pattern as a mask. At this time, when the inorganic film is formed on the surface of the used semiconductor substrate, the surface of the inorganic film is exposed, and when the inorganic film is not formed on the surface of the used semiconductor substrate, Expose the surface.
- a desired pattern can be obtained by wet etching using a basic hydrogen peroxide aqueous solution using a protective film after dry etching (or a resist pattern if the resist pattern remains on the protective film) as a mask. Is formed.
- a basic substance such as ammonia, sodium hydroxide, potassium hydroxide, sodium cyanide, potassium cyanide, triethanolamine or the like is mixed with hydrogen peroxide solution to adjust the pH. Mention may be made of basic hydrogen peroxide solutions made basic.
- pH basic for example, those that mix urea and hydrogen peroxide, generate ammonia by causing thermal decomposition of urea by heating, and finally make the pH basic Can also be used as a chemical solution for wet etching.
- the use temperature of the basic aqueous hydrogen peroxide solution is preferably 25 ° C. to 90 ° C., more preferably 40 ° C. to 80 ° C.
- the wet etching time is preferably 0.5 minutes to 30 minutes, and more preferably 1 minute to 20 minutes.
- a solid content concentration 10 mass% solution manufactured by LANCASTAR
- p-vinylphenol monomer is dissolved in propylene glycol
- 25 g of methyl methacrylate manufactured by Junsei Chemical Co., Ltd.
- a precipitate obtained by re-precipitation in 1 liter of distilled water was filtered and dried to obtain a polymer powder having a structural unit represented by the following formula (1A).
- the weight average molecular weight was about 5000 in standard polystyrene conversion.
- the structure of the obtained polymer was a copolymer of p-vinylphenol and methyl methacrylate in a molar ratio of 25:75.
- Example 1 0.50 g of polyparahydroxystyrene (Nippon Soda Co., Ltd., trade name: VP-8000), 11.52 g of propylene glycol monomethyl ether, 7.68 g of propylene glycol monomethyl ether acetate, and block isocyanate resin (Evonik Japan Co., Ltd.) ), Trade name: VESTANAT (registered trademark) B1358 / 100) 0.30 g was added to give a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition. When the GPC analysis of the said polyparahydroxy styrene was conducted, the weight average molecular weight was about 11,000 in standard polystyrene conversion.
- Example 2 Polyparahydroxystyrene (Nippon Soda Co., Ltd., trade name: VP-8000) 0.50 g, propylene glycol monomethyl ether 11.52 g, propylene glycol monomethyl ether acetate 7.68 g, and 1,3,5-tris ( 0.30 g of 4-vinyloxybutyl) trimellitate was added to make a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- VP-8000 Polyparahydroxystyrene
- Example 3 0.49 g of polyparahydroxystyrene (manufactured by Nippon Soda Co., Ltd., trade name: VP-8000), 11.52 g of propylene glycol monomethyl ether, 7.68 g of propylene glycol monomethyl ether acetate, tetrabutanetetracarboxylate (3,4) -Epoxycyclohexylmethyl) -modified ⁇ -caprolactone (manufactured by Daicel Corporation, trade name: Epolide [registered trademark] GT-401) 0.29 g and pyridinium p-toluenesulfonate 0.01 g were added to obtain a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- polyparahydroxystyrene manufactured by Nippon Soda Co., Ltd., trade name: VP-8000
- propylene glycol monomethyl ether 7.
- Example 4 Polyparahydroxystyrene (Nippon Soda Co., Ltd., trade name: VP-8000) 0.60 g, propylene glycol monomethyl ether 11.52 g, propylene glycol monomethyl ether acetate 7.68 g, tris (4,5-epoxypentyl) 0.18 g of isocyanurate (manufactured by Nissan Chemical Industries, Ltd., trade name: TEPIC (registered trademark) -VL) and 0.02 g of pyridinium p-toluenesulfonate were added to obtain a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 5 0.33 g of polyparahydroxystyrene (manufactured by Nippon Soda Co., Ltd., trade name: VP-8000), 11.52 g of propylene glycol monomethyl ether, 7.68 g of propylene glycol monomethyl ether acetate, and 1,3,5-tris ( 0.47 g of 4-vinyloxybutyl) trimellitate was added to make a solution.
- the solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 6 0.43 g of polyparahydroxystyrene (manufactured by Nippon Soda Co., Ltd., trade name: VP-8000), 11.52 g of propylene glycol monomethyl ether, 7.68 g of propylene glycol monomethyl ether acetate, and EPOTOTO manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. [Registered trademark] 0.37 g of YH-434L was added to prepare a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 7 0.45 g of polyparahydroxystyrene (Nippon Soda Co., Ltd., trade name: VP-8000), 11.52 g of propylene glycol monomethyl ether, 7.68 g of propylene glycol monomethyl ether acetate, and TG- manufactured by Shikoku Kasei Co., Ltd. 0.35 g of G was added to make a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 8 Polyparahydroxystyrene (Nippon Soda Co., Ltd., trade name: VP-8000) 0.40 g, propylene glycol monomethyl ether 5.76 g, propylene glycol monomethyl ether acetate 13.44 g, and Nippon Steel & Sumikin Chemical Co., Ltd. [Registered trademark] 0.40 g of YH-434L was added to prepare a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 9 0.36 g of polyparahydroxystyrene (manufactured by Nippon Soda Co., Ltd., trade name: VP-8000), 5.76 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and EPOTOTO manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. [Registered trademark] 0.44 g of YH-434L was added to prepare a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 10 3.20 g of a propylene glycol monomethyl ether solution containing 0.64 g of the polymer obtained in Synthesis Example 1, 3.20 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and Epototo manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. Trademark] 0.16 g of YH-434L was added to prepare a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 11 To 3.08 g of propylene glycol monomethyl ether solution containing 0.62 g of the polymer obtained in Synthesis Example 1, 3.30 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and Epototo manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. Trademark] 0.18 g of YH-434L was added to obtain a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 12 To 3.20 g of the propylene glycol monomethyl ether solution containing 0.64 g of the polymer obtained in Synthesis Example 1, 3.20 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and TG-G manufactured by Shikoku Kasei Co., Ltd. 0.16 g was added to make a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 13 To 2.22 g of a propylene glycol monomethyl ether solution containing 0.44 g of the compound obtained in Synthesis Example 2, 3.99 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and Epototo manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. Trademark] 0.36 g of YH-434L was added to obtain a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 14 To 3.08 g of a propylene glycol monomethyl ether solution containing 0.62 g of the compound obtained in Synthesis Example 2, 3.30 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and TG-G manufactured by Shikoku Kasei Co., Ltd. 0.18 g was added to obtain a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 15 To 2.50 g of a propylene glycol monomethyl ether solution containing 0.50 g of the compound obtained in Synthesis Example 2, 3.76 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and TG-G manufactured by Shikoku Kasei Co., Ltd. 0.30 g was added to make a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 16 To 2.35 g of a propylene glycol monomethyl ether solution containing 0.47 g of the compound obtained in Synthesis Example 2, 3.88 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and TG-G manufactured by Shikoku Kasei Co., Ltd. 0.33 g was added to obtain a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 17 To 2.22 g of the propylene glycol monomethyl ether solution containing 0.44 g of the compound obtained in Synthesis Example 2, 3.98 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and TG-G manufactured by Shikoku Kasei Co., Ltd. 0.36 g was added to make a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- Example 18 To 2.33 g of the propylene glycol monomethyl ether solution containing 0.47 g of the compound obtained in Synthesis Example 3, 3.90 g of propylene glycol monomethyl ether, 13.44 g of propylene glycol monomethyl ether acetate, and TG-G manufactured by Shikoku Kasei Co., Ltd. 0.33 g was added to obtain a solution. The solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a protective film forming composition.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- TMOM-BP pyridinium p-toluenesulfonate
- the solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a film-forming composition.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- TMOM-BP pyridinium p-toluenesulfonate
- the solution was filtered using a polyethylene microfilter having a pore size of 0.02 ⁇ m to prepare a film-forming composition.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- the film-forming composition of this comparative example has at least one group selected from the group consisting of a glycidyl group, a terminal epoxy group, an epoxycyclopentyl group, an epoxycyclohexyl group, an oxetanyl group, a vinyl ether group, an isocyanate group, and a blocked isocyanate group. Does not contain a crosslinking agent having two or more in the molecule.
- a coating film prepared on a silicon substrate by baking at 220 ° C. for 60 seconds using the protective film forming composition prepared in Examples 1 to 7, and the protective film prepared in Examples 8 to 18 NMD-3 (manufactured by Tokyo Ohka Kogyo Co., Ltd.) is a developer used for developing a photoresist on a titanium nitride film by baking at 260 ° C. for 60 seconds using the forming composition. It was confirmed that the change in film thickness of the coating film before and after immersion was 5% or less.
- the coating films prepared using the protective film-forming compositions prepared in Examples 1 to 7 had sufficient resistance against the basic hydrogen peroxide aqueous solution. . That is, it was found that these coating films can serve as a protective film against the basic aqueous hydrogen peroxide solution.
- the coating films produced using the protective film-forming compositions prepared in Examples 3 to 7 have excellent resistance to the basic aqueous hydrogen peroxide solution.
- the coating films produced using the film-forming compositions prepared in Comparative Examples 1 to 5 did not have resistance to basic aqueous hydrogen peroxide solution. It became clear that it could not be a protective film against hydrogen peroxide solution.
- the coating films prepared using the protective film-forming compositions prepared in Examples 8 to 18 and the film-forming compositions prepared in Comparative Examples 5 to 9 were prepared using basic compositions having the compositions shown in Table 3 below.
- the film was immersed in an aqueous hydrogen oxide solution at the temperature shown in the table for a specified time (1 minute, 1.5 minutes, 2 minutes), and then the state of the coating film after water washing and drying was visually observed. The results are shown in Table 4 below.
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Abstract
Description
前記架橋剤と反応する置換基X1は、例えば下記式(3)、式(4)、式(5)、式(6)、式(7)、式(8)、式(9)、式(10)又は式(11)で表される基である。
本発明の保護膜形成組成物は、前記式(1)で表される基又は前記式(2)で表される基を側鎖又は末端に有し、重量平均分子量が800以上である化合物を含む。前記化合物の重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)により、標準試料としてポリスチレンを用いて得られる値である。前記重量平均分子量の上限値は、例えば500,000である。前記重量平均分子量が800以上である化合物は、ポリマーに限定されず、単量体、二量体、三量体及びオリゴマーからなる群から選択される1種、又は2種以上の混合物でもよい。当該ポリマーは、コポリマー(共重合体)、ホモポリマー(単独重合体)いずれでもよい。
本発明の保護膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を、1分子中に2つ以上有する架橋剤を含む。当該架橋剤は、上記基のうち1種を1分子中に2つ以上有してもよいし、上記基のうち例えば2種を1分子中に1つずつ(合計2つ)有してもよい。
本発明の保護膜形成組成物は、任意成分として、架橋反応を促進させるために、架橋触媒を含有することができる。当該架橋触媒としては、酸性化合物、塩基性化合物に加え、熱により酸又は塩基が発生する化合物を用いることができる。酸性化合物としては、スルホン酸化合物又はカルボン酸化合物を用いることができ、熱により酸が発生する化合物としては、熱酸発生剤を用いることができる。
スルホン酸化合物又はカルボン酸化合物として、例えば、p-トルエンスルホン酸、トリフルオロメタンスルホン酸、ピリジニウム-p-トルエンスルホネート、サリチル酸、カンファースルホン酸、5-スルホサリチル酸、4-クロロベンゼンスルホン酸、4-ヒドロキシベンゼンスルホン酸、ピリジニウム-4-ヒドロキシベンゼンスルホン酸、ベンゼンジスルホン酸、1-ナフタレンスルホン酸、4-ニトロベンゼンスルホン酸、クエン酸、安息香酸、ヒドロキシ安息香酸が挙げられる。
熱酸発生剤として、例えば、K-PURE〔登録商標〕CXC-1612、同CXC-1614、同TAG-2172、同TAG-2179、同TAG-2678、同TAG2689(以上、King Industries社製)、及びSI-45、SI-60、SI-80、SI-100、SI-110、SI-150(以上、三新化学工業(株)製)が挙げられる。
これら架橋触媒は、1種又は2種以上を組み合わせて用いることができる。また、塩基性化合物としては、アミン化合物又は水酸化アンモニウム化合物を用いることができ、熱により塩基が発生する化合物としては、尿素を用いることができる。
アミン化合物として、例えば、トリエタノールアミン、トリブタノールアミン、トリメチルアミン、トリエチルアミン、トリノルマルプロピルアミン、トリイソプロピルアミン、トリノルマルブチルアミン、トリ-tert-ブチルアミン、トリノルマルオクチルアミン、トリイソプロパノールアミン、フェニルジエタノールアミン、ステアリルジエタノールアミン、及びジアザビシクロオクタン等の第3級アミン、ピリジン及び4-ジメチルアミノピリジン等の芳香族アミンが挙げられる。また、ベンジルアミン及びノルマルブチルアミン等の第1級アミン、ジエチルアミン及びジノルマルブチルアミン等の第2級アミンもアミン化合物として挙げられる。これらのアミン化合物は、単独で又は二種以上を組み合わせて用いることができる。
水酸化アンモニウム化合物としては、例えば、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、水酸化テトラプロピルアンモニウム、水酸化テトラブチルアンモニウム、水酸化ベンジルトリメチルアンモニウム、水酸化ベンジルトリエチルアンモニウム、水酸化セチルトリメチルアンモニウム、水酸化フェニルトリメチルアンモニウム、水酸化フェニルトリエチルアンモニウムが挙げられる。
また、熱により塩基が発生する化合物としては、例えば、アミド基、ウレタン基又はアジリジン基のような熱不安定性基を有し、加熱することでアミンを生成する化合物を使用することができる。その他、尿素、ベンジルトリメチルアンモニウムクロリド、ベンジルトリエチルアンモニウムクロリド、ベンジルジメチルフェニルアンモニウムクロリド、ベンジルドデシルジメチルアンモニウムクロリド、ベンジルトリブチルアンモニウムクロリド、コリンクロリドも熱により塩基が発生する化合物として挙げられる。
前記保護膜形成組成物が架橋触媒を含む場合、その含有量は、当該保護膜形成組成物に含まれる重量平均分子量が800以上である化合物の含有量に対し、例えば0.2質量%乃至20質量%である。
本発明の保護膜形成組成物は、任意成分として、半導体基板に対する塗布性を向上させるために界面活性剤を含有することができる。前記界面活性剤としては、例えばポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンセチルエーテル、ポリオキシエチレンオレイルエーテル等のポリオキシエチレンアルキルエーテル類、ポリオキシエチレンオクチルフェニルエーテル、ポリオキシエチレンノニルフェニルエーテル等のポリオキシエチレンアルキルアリールエーテル類、ポリオキシエチレン・ポリオキシプロピレンブロックコポリマー類、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノステアレート、ソルビタンモノオレエート、ソルビタントリオレエート、ソルビタントリステアレート等のソルビタン脂肪酸エステル類、ポリオキシエチレンソルビタンモノラウレート、ポリオキシエチレンソルビタンモノパルミテート、ポリオキシエチレンソルビタンモノステアレート、ポリオキシエチレンソルビタントリオレエート、ポリオキシエチレンソルビタントリステアレート等のポリオキシエチレンソルビタン脂肪酸エステル類等のノニオン系界面活性剤、エフトップ〔登録商標〕EF301、同EF303、同EF352(三菱マテリアル電子化成(株)製)、メガファック〔登録商標〕F171、同F173、同R-30、同R-30N、同R-40、同R-40-LM(DIC(株)製)、フロラードFC430、同FC431(住友スリーエム(株)製)、アサヒガード〔登録商標〕AG710、サーフロン〔登録商標〕S-382、同SC101、同SC102、同SC103、同SC104、同SC105、同SC106(旭硝子(株)製)等のフッ素系界面活性剤、オルガノシロキサンポリマーKP341(信越化学工業(株)製)を挙げることができる。これらの界面活性剤は、単独で又は二種以上を組み合わせて用いることができる。前記保護膜形成組成物が界面活性剤を含む場合、その含有量は、当該保護膜形成組成物に含まれる重量平均分子量が800以上である化合物の含有量に対し、例えば、0.01質量%乃至10質量%である。
表面に無機膜が形成された半導体基板を用いる場合、当該無機膜は、例えば、ALD(原子層堆積)法、CVD(化学気相堆積)法、反応性スパッタ法、イオンプレーティング法、真空蒸着法、スピンコーティング法(スピンオングラス:SOG)により形成される。前記無機膜として、例えば、ポリシリコン膜、酸化ケイ素膜、窒化珪素膜、BPSG(Boro-Phospho Silicate Glass)膜、窒化チタン膜、窒化酸化チタン膜、タングステン膜、窒化ガリウム膜、及びヒ化ガリウム膜が挙げられる。
装置:東ソー(株)製HLC-8220GPC
GPCカラム:Shodex〔登録商標〕KF-803L、同KF-802、同KF-801
カラム温度:40℃
流量:0.2mL/分
溶離液:THF
標準試料:ポリスチレン(東ソー(株))
プロピレングリコール中にp-ビニルフェノールモノマーが溶解した固形分濃度10質量%の溶液(LANCASTER社製)100gにプロピレングリコールを40.60g加え、その溶液にメチルメタクリレート(純正化学(株)製)25gを溶解させた後、反応液中に窒素を30分間流した。反応液を70℃に保ちながら、プロピレングリコール40gに溶解させたアゾビスイソブチロニトリル(純正化学(株)製)1.32gを添加し、窒素雰囲気下で撹拌した。反応物は蒸留水1リットル中に再沈することにより得られた沈降物を濾過し、乾燥することにより下記式(1A)で表される構造単位を有するポリマーの粉体を得た。得られたポリマーのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は約5000であった。また、得られたポリマーの構造は、p-ビニルフェノールとメチルメタクリレートとがモル比で25:75の割合で共重合したものであった。
トリス-(2,3-エポキシプロピル)-イソシアヌレート(日産化学工業(株)製、製品名:TEPIC-SS)10g、3,7-ジヒドロキシ-2-ナフトエ酸(東京化成工業(株)製)20.50g、エチルトリフェニルホスホニウムブロミド(ACROSS社製)0.90g、及びプロピレングリコールモノメチルエーテル73.27gを混合した溶液を120℃に加温し、窒素雰囲気化で24時間反応させ、下記式(1B)で表される化合物を含む溶液を得た。得られた化合物を含む溶液のGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は約1000であった。
トリス-(2,3-エポキシプロピル)-イソシアヌレート(日産化学工業(株)製、製品名:TEPIC-SS)10g、2,5-ジヒドロキシ安息香酸(東京化成工業(株)製)15.63g、エチルトリフェニルホスホニウムブロミド(ACROSS社製)0.902g、及びプロピレングリコールモノメチルエーテル61.90gを混合した溶液を120℃に加温し、窒素雰囲気化で24時間反応させ、下記式(1C)で表される化合物を含む溶液を得た。得られた化合物を含む溶液のGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は約1000であった。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.50gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、及びブロックイソシアネート樹脂(エボニックジャパン(株)製,商品名:VESTANAT〔登録商標〕B1358/100)0.30gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。前記ポリパラヒドロキシスチレンのGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は約11,000であった。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.50gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、及び1,3,5-トリス(4-ビニルオキシブチル)トリメリテート0.30gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.49gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、ブタンテトラカルボン酸テトラ(3,4-エポキシシクロヘキシルメチル)修飾ε-カプロラクトン((株)ダイセル製,商品名:エポリード〔登録商標〕GT-401)0.29g、及びピリジニウムp-トルエンスルホナート0.01gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.60gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、トリス(4,5-エポキシペンチル)イソシアヌレート(日産化学工業(株)製,商品名:TEPIC〔登録商標〕-VL)0.18g、及びピリジニウムp-トルエンスルホナート0.02gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.33gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、及び1,3,5-トリス(4-ビニルオキシブチル)トリメリテート0.47gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.43gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、及び新日鉄住金化学(株)製エポトート〔登録商標〕YH-434Lを0.37g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.45gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、及び四国化成(株)製TG-Gを0.35g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.40gに、プロピレングリコールモノメチルエーテル5.76g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び新日鉄住金化学(株)製エポトート〔登録商標〕YH-434Lを0.40g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.36gに、プロピレングリコールモノメチルエーテル5.76g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び新日鉄住金化学(株)製エポトート〔登録商標〕YH-434Lを0.44g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例1で得たポリマー0.64gを含むプロピレングリコールモノメチルエーテル溶液3.20gに、プロピレングリコールモノメチルエーテル3.20g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び新日鉄住金化学(株)製エポトート〔登録商標〕YH-434Lを0.16g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例1で得たポリマー0.62gを含むプロピレングリコールモノメチルエーテル溶液3.08gに、プロピレングリコールモノメチルエーテル3.30g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び新日鉄住金化学(株)製エポトート〔登録商標〕YH-434Lを0.18g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例1で得たポリマー0.64gを含むプロピレングリコールモノメチルエーテル溶液3.20gに、プロピレングリコールモノメチルエーテル3.20g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び四国化成(株)製TG-Gを0.16g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例2で得た化合物0.44gを含むプロピレングリコールモノメチルエーテル溶液2.22gに、プロピレングリコールモノメチルエーテル3.99g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び新日鉄住金化学(株)製エポトート〔登録商標〕YH-434Lを0.36g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例2で得た化合物0.62gを含むプロピレングリコールモノメチルエーテル溶液3.08gに、プロピレングリコールモノメチルエーテル3.30g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び四国化成(株)製TG-Gを0.18g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例2で得た化合物0.50gを含むプロピレングリコールモノメチルエーテル溶液2.50gに、プロピレングリコールモノメチルエーテル3.76g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び四国化成(株)製TG-Gを0.30g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例2で得た化合物0.47gを含むプロピレングリコールモノメチルエーテル溶液2.35gに、プロピレングリコールモノメチルエーテル3.88g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び四国化成(株)製TG-Gを0.33g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例2で得た化合物0.44gを含むプロピレングリコールモノメチルエーテル溶液2.22gに、プロピレングリコールモノメチルエーテル3.98g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び四国化成(株)製TG-Gを0.36g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
合成例3で得た化合物0.47gを含むプロピレングリコールモノメチルエーテル溶液2.33gに、プロピレングリコールモノメチルエーテル3.90g、プロピレングリコールモノメチルエーテルアセテート13.44g、及び四国化成(株)製TG-Gを0.33g添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、保護膜形成組成物を調製した。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.60gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.18g、及びピリジニウムp-トルエンスルホナート0.02gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.49gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.29g、及びピリジニウムp-トルエンスルホナート0.01gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.60gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、3,3’,5,5’-テトラキス(メトキシメチル)-[1,1’-ビフェニル]-4,4’-ジオール(本州化学工業(株)製,商品名:TMOM-BP)0.18g、及びピリジニウムp-トルエンスルホナート0.02gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.49gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、3,3’,5,5’-テトラキス(メトキシメチル)-[1,1’-ビフェニル]-4,4’-ジオール(本州化学工業(株)製,商品名:TMOM-BP)0.29g、及びピリジニウムp-トルエンスルホナート0.01gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
ポリパラヒドロキシスチレン(日本曹達(株)製,商品名:VP-8000)0.34gに、プロピレングリコールモノメチルエーテル11.52g、プロピレングリコールモノメチルエーテルアセテート7.68g、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.45g、及びピリジニウムp-トルエンスルホナート0.01gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
合成例1で得たポリマー0.57gを含むプロピレングリコールモノメチルエーテル溶液2.84gに、プロピレングリコールモノメチルエーテル3.49g、プロピレングリコールモノメチルエーテルアセテート13.44g、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.22g、及びピリジニウムp-トルエンスルホナート0.02gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
合成例2で得た化合物0.56gを含むプロピレングリコールモノメチルエーテル溶液2.81gに、プロピレングリコールモノメチルエーテル3.51g、プロピレングリコールモノメチルエーテルアセテート13.44g、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.22g、及びピリジニウムp-トルエンスルホナート0.02gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
合成例2で得た化合物0.44gを含むプロピレングリコールモノメチルエーテル溶液2.20gに、プロピレングリコールモノメチルエーテル4.00g、プロピレングリコールモノメチルエーテルアセテート13.44g、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.35g、及びピリジニウムp-トルエンスルホナート0.01gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
合成例3で得た化合物0.41gを含むプロピレングリコールモノメチルエーテル溶液2.03gに、プロピレングリコールモノメチルエーテル4.14g、プロピレングリコールモノメチルエーテルアセテート13.44g、1,3,4,6-テトラキス(メトキシメチル)グリコールウリル0.38g、及びピリジニウムp-トルエンスルホナート0.01gを添加し、溶液とした。その溶液を、孔径0.02μmのポリエチレン製ミクロフィルターを用いてろ過することで、膜形成組成物を調製した。本比較例の膜形成組成物は、グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤を含有しない。
シリコン基板上に、実施例1乃至実施例7で調製した保護膜形成組成物及び比較例1乃至比較例5で調製した膜形成組成物をスピンコートにて塗布し、220℃で60秒ベークすることで、100nmの膜厚の塗膜を作製した。
シリコン基板の表面に形成された50nmの厚さの窒化チタン膜上に、実施例8乃至実施例18で調製した保護膜形成組成物及び比較例5乃至比較例9で調製した膜形成組成物をスピンコートにて塗布し、260℃で60秒ベークすることで、100nmの膜厚の塗膜を作製した。
実施例1乃至実施例7で調製した保護膜形成組成物を用いて、220℃で60秒ベークすることでシリコン基板上に作製した塗膜、及び実施例8乃至実施例18で調製した保護膜形成組成物を用いて、260℃で60秒ベークすることで窒化チタン膜上に作製した塗膜を、フォトレジスト塗布時に使用する溶剤であるOK73シンナー(東京応化工業(株)製、プロピレングリコールモノメチルエーテル及びプロピレングリコールモノメチルエーテルアセテートの混合物)に1分間浸漬し、浸漬の前後での塗膜の膜厚の変化が5%以下であることを確認した。この結果は、実施例1乃至実施例18で調製した塗膜は、上層にレジストを積層することが可能であることを示している。
実施例1乃至実施例7で調製した保護膜形成組成物を用いて、220℃で60秒ベークすることでシリコン基板上に作製した塗膜、及び実施例8乃至実施例18で調製した保護膜形成組成物を用いて、260℃で60秒ベークすることで窒化チタン膜上に作製した塗膜を、フォトレジスト現像時に使用される現像液であるNMD-3(東京応化工業(株)製)に1分間浸漬し、浸漬の前後での塗膜の膜厚の変化が5%以下であることを確認した。
実施例1乃至実施例7で調製した保護膜形成組成物及び比較例1乃至比較例5で調製した膜形成組成物を用いて作製した塗膜を、下記表1で示した組成の塩基性過酸化水素水溶液に、同表に示す温度で規定の時間(4分間、8分間、12分間)浸し、その後水洗、乾燥後の塗膜の状態を目視で観察した。その結果を下記表2に示す。表2中の“□”は4分処理後も塗膜に剥がれが見られない状態を、“○”は8分処理後も塗膜に剥がれが見られない状態を、“◎”は12分処理後も塗膜に剥がれが見られない状態を、“×”は4分処理後に塗膜の一部又は全てにおいて剥がれが観察された状態を示している。
実施例8乃至実施例18で調製した保護膜形成組成物及び比較例5乃至比較例9で調製した膜形成組成物を用いて作製した塗膜を、下記表3で示した組成の塩基性過酸化水素水溶液に、同表に示す温度で規定の時間(1分間、1.5分間、2分間)浸し、その後水洗、乾燥後の塗膜の状態を目視で観察した。その結果を下記表4に示す。表4中の“□”は1分処理後も塗膜に剥がれが見られない状態を、“○”は1.5分処理後も塗膜に剥がれが見られない状態を、“◎”は2分処理後も塗膜に剥がれが見られない状態を、“×”は1分処理後に塗膜の一部又は全てにおいて剥がれが観察された状態を示している。
実施例1乃至実施例18で調製した保護膜形成組成物を用いて作製した塗膜において、架橋剤が、重量平均分子量が800以上である化合物中の当該架橋剤と反応する置換基(以下、置換基と称する。)を封止する量を、化学構造が既知の架橋剤については下記式(A)に基づいて、化学構造が未知の架橋剤については下記式(B)に基づいて計算した結果を下記表5に示した。
式(A):100×(重量平均分子量が800以上である化合物に対する架橋剤の添加量「質量%」)/
[{100/(重量平均分子量が800以上である化合物の1単位構造の分子量)×(重量平均分子量が800以上である化合物の1単位構造の置換基数)}/(架橋剤1分子の架橋点数)×(架橋剤の分子量)]
式(B):100×(重量平均分子量が800以上である化合物に対する架橋剤の添加量「質量%」)/
[{100/(重量平均分子量が800以上である化合物の1単位構造の分子量)×(重量平均分子量が800以上である化合物の1単位構造の置換基数)}×(架橋剤の架橋点1つ当たりの当該架橋剤の分子量)]
Claims (10)
- グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤、下記式(1)で表される基を側鎖又は末端に有し重量平均分子量が800以上である化合物、及び有機溶剤を含む、塩基性過酸化水素水溶液に対する保護膜形成組成物。
- グリシジル基、末端エポキシ基、エポキシシクロペンチル基、エポキシシクロヘキシル基、オキセタニル基、ビニルエーテル基、イソシアネート基及びブロックイソシアネート基からなる群から選ばれる少なくとも1種の基を1分子中に2つ以上有する架橋剤、下記式(2)で表される基を側鎖又は末端に有し重量平均分子量が800以上である化合物、及び有機溶剤を含む、塩基性過酸化水素水溶液に対する保護膜形成組成物。
- 前記架橋剤と反応する置換基X1は前記式(3)、式(5)又は式(6)で表される基である請求項3に記載の塩基性過酸化水素水溶液に対する保護膜形成組成物。
- 前記架橋剤の添加量は、前記重量平均分子量が800以上である化合物中の前記架橋剤と反応する置換基X1全てを100モル%としたとき該置換基X1を20モル%乃至150モル%封止可能な量である請求項1乃至請求項4のいずれか一項に記載の塩基性過酸化水素水溶液に対する保護膜形成組成物。
- 前記架橋剤はグリシジル基、末端エポキシ基又はエポキシシクロヘキシル基を1分子中に2つ以上有する請求項1乃至請求項5のいずれか一項に記載の塩基性過酸化水素水溶液に対する保護膜形成組成物。
- 架橋触媒をさらに含む請求項1乃至請求項7のいずれか一項に記載の塩基性過酸化水素水溶液に対する保護膜形成組成物。
- 界面活性剤をさらに含む請求項1乃至請求項8のいずれか一項に記載の塩基性過酸化水素水溶液に対する保護膜形成組成物。
- 表面に無機膜が形成されていてもよい半導体基板上に請求項1乃至請求項9のいずれか一項に記載の塩基性過酸化水素水溶液に対する保護膜形成組成物を用いて保護膜を形成し、前記保護膜上にレジストパターンを形成し、前記レジストパターンをマスクとして前記保護膜をドライエッチングし前記無機膜又は前記半導体基板の表面を露出させ、ドライエッチング後の前記保護膜をマスクとして、塩基性過酸化水素水溶液を用いて前記無機膜又は前記半導体基板をウエットエッチング及び洗浄する、パターン形成方法。
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JP2022031348A (ja) | 2022-02-18 |
TWI813539B (zh) | 2023-09-01 |
KR102409417B1 (ko) | 2022-06-15 |
JPWO2017191767A1 (ja) | 2019-03-07 |
CN109073978B (zh) | 2022-05-17 |
TW201807504A (zh) | 2018-03-01 |
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CN109073978A (zh) | 2018-12-21 |
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