WO2012077640A1 - 水酸基含有カルバゾールノボラック樹脂を含むレジスト下層膜形成組成物 - Google Patents
水酸基含有カルバゾールノボラック樹脂を含むレジスト下層膜形成組成物 Download PDFInfo
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- WO2012077640A1 WO2012077640A1 PCT/JP2011/078088 JP2011078088W WO2012077640A1 WO 2012077640 A1 WO2012077640 A1 WO 2012077640A1 JP 2011078088 W JP2011078088 W JP 2011078088W WO 2012077640 A1 WO2012077640 A1 WO 2012077640A1
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- carbon atoms
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- 150000003384 small molecules Chemical class 0.000 description 1
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- 235000019795 sodium metasilicate Nutrition 0.000 description 1
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- MUTNCGKQJGXKEM-UHFFFAOYSA-N tamibarotene Chemical compound C=1C=C2C(C)(C)CCC(C)(C)C2=CC=1NC(=O)C1=CC=C(C(O)=O)C=C1 MUTNCGKQJGXKEM-UHFFFAOYSA-N 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
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- 229940072958 tetrahydrofurfuryl oleate Drugs 0.000 description 1
- ZEMGGZBWXRYJHK-UHFFFAOYSA-N thiouracil Chemical compound O=C1C=CNC(=S)N1 ZEMGGZBWXRYJHK-UHFFFAOYSA-N 0.000 description 1
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- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
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- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
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- WLOQLWBIJZDHET-UHFFFAOYSA-N triphenylsulfonium Chemical class C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 WLOQLWBIJZDHET-UHFFFAOYSA-N 0.000 description 1
- FAYMLNNRGCYLSR-UHFFFAOYSA-M triphenylsulfonium triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F.C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 FAYMLNNRGCYLSR-UHFFFAOYSA-M 0.000 description 1
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Classifications
-
- 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
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
-
- 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
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- 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
- C09D139/00—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
- C09D139/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
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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
- G03F7/094—Multilayer resist systems, e.g. planarising layers
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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
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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
- H01L21/027—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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- 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
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
Definitions
- the present invention relates to a resist underlayer film forming composition for lithography effective at the time of processing a semiconductor substrate, a resist pattern forming method using the resist underlayer film forming composition, and a method for manufacturing a semiconductor device.
- BARC Bottom Anti-Reflective Coating
- Examples of the polymer for the resist underlayer film include the following.
- a resist underlayer film forming composition using polyvinyl carbazole is exemplified (see Patent Document 1, Patent Document 2, and Patent Document 3).
- a resist underlayer film forming composition using a fluorenephenol novolak resin is disclosed (for example, see Patent Document 4).
- a resist underlayer film forming composition using a fluorene naphthol novolak resin is disclosed (see, for example, Patent Document 5).
- a resist underlayer film forming composition containing a resin having fluorenephenol and arylalkylene as repeating units is disclosed (see, for example, Patent Document 6 and Patent Document 7).
- JP-A-2-293850 Japanese Patent Laid-Open No. 1-154050 JP-A-2-22657 JP 2005-128509 A JP 2007-199653 A JP 2007-178974 A US Pat. No. 7,378,217
- An object of the present invention is to provide a resist underlayer film forming composition for use in a lithography process for manufacturing a semiconductor device. Another object of the present invention is to provide an excellent resist pattern without intermixing with the resist layer, and to have a dry etching rate close to that of the resist. It is an object of the present invention to provide a resist underlayer film for lithography having a selectivity ratio of 2 and a resist underlayer film for lithography having a selectivity ratio of a dry etching rate smaller than that of a semiconductor substrate.
- the present invention can also provide the ability to effectively absorb the reflected light from the substrate when using irradiation light having a wavelength of 248 nm, 193 nm, 157 nm or the like for fine processing.
- the objective of this invention is providing the formation method of the resist pattern using the resist underlayer film forming composition.
- Another object of the present invention is to provide a resist underlayer film forming composition for forming a resist underlayer film that also has heat resistance.
- R 1 and R 2 are each independently a hydrogen atom, a halogen atom, a nitro group, an amino group, a hydroxy group, an alkyl group having 1 to 10 carbon atoms, or an alkenyl having 2 to 10 carbon atoms.
- R 3 represents a hydrogen atom
- R 4 represents a group, an alkenyl group having 2 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a combination of these groups which may include an ether bond, a ketone bond, or an ester bond.
- R 5 is Represents a primary atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a heterocyclic group which may be substituted with a halogen atom, a nitro group, an amino group, or a hydroxy group; R 4 and R 5 may form a ring with each other.
- N1 and n2 each represent an integer of 1 to 3, and a unit structure represented by formula (2):
- Ar represents an aromatic ring group having 6 to 20 carbon atoms
- R 6 represents a hydroxy group
- R 7 represents a hydrogen atom, a halogen atom, a nitro group, an amino group, or 1 carbon atom.
- R 8 represents a hydrogen atom, an aryl group having 6 to 40 carbon atoms which may be substituted with a halogen atom, a nitro group, an amino group or a hydroxy group, or a heterocyclic group
- R 9 represents a hydrogen atom or a halogen atom atom, a nitro group, an amino group, or may be substituted with a hydroxy alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 40 carbon atoms, or a heterocyclic group
- R 8 9 together represents an integer of 1 ⁇ p is .n6 which may form a ring, n7 is.
- R 1 , R 2 , R 3 , and R 5 represent a hydrogen atom
- R 4 represents a naphthalene ring or a pyrene ring.
- Composition As a third aspect, in formula (2), Ar represents a naphthalene ring, R 7 and R 9 represent a hydrogen atom, and R 8 represents a naphthalene ring or a pyrene ring.
- Resist underlayer film forming composition As a fourth aspect, the resist underlayer film forming composition according to any one of the first aspect to the third aspect, further including a crosslinking agent, As a fifth aspect, the resist underlayer film forming composition according to any one of the first to fourth aspects, further comprising an acid and / or an acid generator, As a sixth aspect, a resist underlayer film obtained by applying and baking the resist underlayer film forming composition according to any one of the first to fifth aspects on a semiconductor substrate,
- the resist underlayer film forming composition according to any one of the first to fifth aspects is applied to a semiconductor substrate and baked to form a lower layer film. Forming a resist pattern;
- a method of manufacturing a semiconductor device including a step of etching a lower layer film and a step of processing a semiconductor substrate according to a patterned lower layer film, and as a tenth aspect, described in the ninth aspect, wherein the hard mask is formed by vapor deposition of an inorganic substance It is a manufacturing method.
- the resist underlayer film forming composition of the present invention With the resist underlayer film forming composition of the present invention, a good resist pattern shape can be formed without causing intermixing between the upper layer portion of the resist underlayer film and the layer coated thereon.
- the resist underlayer film obtained from the resist underlayer film forming composition of the present invention can be imparted with the ability to efficiently suppress reflection from the substrate, and can also have an effect as an antireflection film for exposure light. it can.
- the resist underlayer film forming composition of the present invention With the resist underlayer film forming composition of the present invention, the dry etching rate selectivity close to the resist, the dry etching rate selectivity lower than that of the resist, and the dry etching rate selectivity lower than that of the semiconductor substrate are excellent.
- a resist underlayer film can be provided.
- the resist underlayer film obtained from the composition has extremely high heat resistance.
- a resist pattern having a good shape can be accurately formed by using a film obtained from the above composition as a resist underlayer film.
- the resist is thinned.
- the resist pattern is transferred to the lower layer film by an etching process, the substrate processing is performed using the lower layer film as a mask, or the resist pattern is transferred to the lower layer film by an etching process, and further to the lower layer film.
- the resist underlayer film and the composition for forming the resist of the present invention are effective for this process.
- a processed substrate for example, a thermal silicon oxide film on the substrate, silicon nitride) Film, polysilicon film, etc.
- the resist underlayer film of the present invention can be used as a planarizing film, a resist underlayer film, a resist layer antifouling film, or a film having dry etch selectivity. This makes it possible to easily and accurately form a resist pattern in a lithography process for manufacturing a semiconductor.
- a resist underlayer film by the resist underlayer film forming composition according to the present invention is formed on a substrate, a hard mask is formed thereon, a resist film is formed thereon, a resist pattern is formed by exposure and development, and a resist pattern Is transferred to the hard mask, the resist pattern transferred to the hard mask is transferred to the resist underlayer film, and the semiconductor substrate is processed with the resist underlayer film.
- the hard mask may be formed by a coating type composition containing an organic polymer or inorganic polymer and a solvent, or by vacuum deposition of an inorganic substance. In the vacuum deposition of an inorganic material (for example, silicon nitride oxide), the deposited material is deposited on the resist underlayer film surface.
- the temperature of the resist underlayer film surface rises to around 400 ° C. Since the resist underlayer film by the resist underlayer film forming composition of the present invention has very high heat resistance, thermal deterioration is hardly caused even by deposition of a deposited material.
- the present invention includes a unit structure represented by the formula (1) and a unit structure represented by the formula (2), and the unit structure represented by the formula (1) and the unit structure represented by the formula (2) are moles.
- a resist underlayer film forming composition comprising a polymer in a ratio of 3 to 97:97 to 3 or 10 to 90:90 to 10 in a ratio.
- the resist underlayer film forming composition for lithography includes the polymer and a solvent. And it can contain a crosslinking agent and an acid, and can contain additives, such as an acid generator and surfactant, as needed.
- the solid content of the composition is 0.1 to 70% by mass, or 0.1 to 60% by mass. The solid content is the content ratio of all components excluding the solvent from the resist underlayer film forming composition.
- the polymer is contained in a solid content in a proportion of 1 to 100% by mass, or 1 to 99.9% by mass, or 50 to 99.9% by mass, or 50 to 95% by mass, or 50 to 90% by mass. Can do.
- the polymer used in the present invention has a weight average molecular weight of 600 to 1000000 or 600 to 200000.
- R 1 and R 2 are each independently a hydrogen atom, a halogen atom, a nitro group, an amino group, a hydroxy group, an alkyl group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms. Or an aryl group having 6 to 40 carbon atoms, and a combination of these functional groups which may contain an ether bond, a ketone bond, or an ester bond.
- R 3 may be a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an aryl group having 6 to 40 carbon atoms, and may be an ether bond, a ketone bond, It can be set as the combination of these functional groups which may contain the ester bond.
- R 4 can be a hydrogen atom, and can be a C 6-40 aryl group optionally substituted with a halogen atom, a nitro group, an amino group or a hydroxy group, or a heterocyclic group.
- R 5 may be a hydrogen atom, and may be an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 40 carbon atoms which may be substituted with a halogen atom, a nitro group, an amino group, or a hydroxy group Or a heterocyclic group.
- R 4 and R 5 may form a ring with each other. These rings may have a structure in which, for example, R 4 and R 5 are each bonded to the 9-position of fluorene.
- n1 and n2 each represent an integer of 1 to 3.
- Ar represents an aromatic ring group having 6 to 20 carbon atoms
- R 6 represents a hydroxy group
- R 7 represents a hydrogen atom, a halogen atom, a nitro group, an amino group, or 1 to 10 alkyl groups, alkenyl groups having 2 to 10 carbon atoms, aryl groups having 6 to 40 carbon atoms, or a combination of these groups which may contain an ether bond, a ketone bond, or an ester bond.
- R 8 can be a hydrogen atom, and can be a C 6-40 aryl group optionally substituted with a halogen atom, a nitro group, an amino group or a hydroxy group, or a heterocyclic group.
- R 9 can be a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 40 carbon atoms which may be substituted with a halogen atom, a nitro group, an amino group, or a hydroxy group Or a heterocyclic group.
- R 8 and R 9 may form a ring with each other.
- n6 represents an integer of 1 to p
- n7 represents an integer of pn6.
- p represents the maximum number that can be substituted with the aromatic ring group Ar.
- Ar represents a benzene ring, a naphthalene ring, an anthracene ring or the like, and a naphthalene ring is particularly preferable.
- n6 represents an integer of 1 to 4
- n7 represents an integer of [4- (n6)].
- n6 represents an integer of 1 to 6
- n7 represents an integer of [6- (n6)].
- n6 represents an integer of 1 to 8
- n7 represents an integer of [8- (n6)].
- halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- alkyl group having 1 to 10 carbon atoms examples include methyl group, ethyl group, n-propyl group, i-propyl group, cyclopropyl group, n-butyl group, i-butyl group, s-butyl group, and t-butyl group.
- Cyclobutyl group 1-methyl-cyclopropyl group, 2-methyl-cyclopropyl group, n-pentyl group, 1-methyl-n-butyl group, 2-methyl-n-butyl group, 3-methyl-n-butyl Group, 1,1-dimethyl-n-propyl group, 1,2-dimethyl-n-propyl group, 2,2-dimethyl-n-propyl group, 1-ethyl-n-propyl group, cyclopentyl group, 1-methyl -Cyclobutyl group, 2-methyl-cyclobutyl group, 3-methyl-cyclobutyl group, 1,2-dimethyl-cyclopropyl group, 2,3-dimethyl-cyclopropyl group, 1-ethyl-cyclopropyl group, 2-ethyl Ru-cyclopropyl group, n-hexyl group, 1-methyl-n-pentyl group, 2-methyl-n-pentyl group, 3-methyl-n-pentyl group,
- alkenyl group having 2 to 10 carbon atoms examples include ethenyl group, 1-propenyl group, 2-propenyl group, 1-methyl-1-ethenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group, 2- Methyl-1-propenyl group, 2-methyl-2-propenyl group, 1-ethylethenyl group, 1-methyl-1-propenyl group, 1-methyl-2-propenyl group, 1-pentenyl group, 2-pentenyl group, 3 -Pentenyl group, 4-pentenyl group, 1-n-propylethenyl group, 1-methyl-1-butenyl group, 1-methyl-2-butenyl group, 1-methyl-3-butenyl group, 2-ethyl-2 -Propenyl group, 2-methyl-1-butenyl group, 2-methyl-2-butenyl group, 2-methyl-3-butenyl group, 3-methyl-1-butenyl group, 3-methyl-2-buten
- Examples of the aryl group having 6 to 40 carbon atoms include phenyl group, o-methylphenyl group, m-methylphenyl group, p-methylphenyl group, o-chlorophenyl group, m-chlorophenyl group, and p-chlorophenyl group.
- the heterocyclic group is preferably an organic group composed of a 5- to 6-membered heterocyclic ring containing nitrogen, sulfur, and oxygen.
- a pyrrole group, a furan group, a thiophene group, an imidazole group, an oxazole group, a thiazole group, a pyrazole group, An isoxazole group, an isothiazole group, a pyridine group, etc. are mentioned.
- Ar in the formula (2) represents a naphthalene ring
- R 7 and R 9 represent a hydrogen atom
- R 8 represents a naphthalene ring or a pyrene ring
- carbazoles used in the present invention include carbazole, 1,3,6,8-tetranitrocarbazole, 3,6-diaminocarbazole, 3,6-dibromo-9-ethylcarbazole, and 3,6-dibromo-9.
- Examples of the hydroxy group-containing aromatic compound used in the production of the polymer of the present invention include phenol, dihydroxybenzene, trihydroxybenzene, naphthol, dihydroxynaphthalene, trihydroxynaphthalene, hydroxyanthracene, dihydroxyanthracene, and trihydroxyanthracene.
- aldehydes used for the production of the polymer of the present invention include formaldehyde, paraformaldehyde, acetaldehyde, propyl aldehyde, butyraldehyde, isobutyraldehyde, valeraldehyde, capronaldehyde, 2-methylbutyraldehyde, hexyl aldehyde, undecane aldehyde, 7-methoxy.
- ketones used for the production of the polymer of the present invention are diaryl ketones, and examples thereof include diphenyl ketone, phenyl naphthyl ketone, dinaphthyl ketone, phenyl tolyl ketone, ditolyl ketone, 9-fluorenone and the like.
- the polymer used in the present invention is a novolak resin obtained by condensing carbazoles and hydroxy group-containing aromatic compounds with aldehydes or ketones.
- aldehydes or ketones can be used at a ratio of 0.1 to 10 equivalents with respect to 1 equivalent of the phenyl group contained in the carbazole and the hydroxy group-containing aromatic compound and participating in the reaction.
- Examples of the acid catalyst used in the above condensation reaction include mineral acids such as sulfuric acid, phosphoric acid and perchloric acid, organic sulfonic acids such as p-toluenesulfonic acid and p-toluenesulfonic acid monohydrate, formic acid and oxalic acid. Carboxylic acids such as are used.
- the amount of the acid catalyst used is variously selected depending on the type of acids used. Usually, 0.001 to 10000 parts by mass, preferably 0.01 to 1000 parts by mass, more preferably 0.1 to 100 parts by mass of carbazoles or the total of carbazoles and hydroxy group-containing aromatic compounds. ⁇ 100 parts by mass.
- the above condensation reaction is carried out without a solvent, but is usually carried out using a solvent. Any solvent that does not inhibit the reaction can be used. Examples thereof include cyclic ethers such as tetrahydrofuran and dioxane.
- the acid catalyst used is a liquid such as formic acid, it can also serve as a solvent.
- the reaction temperature during the condensation is usually 40 ° C to 200 ° C.
- the reaction time is variously selected depending on the reaction temperature, but is usually about 30 minutes to 50 hours.
- the weight average molecular weight Mw of the polymer obtained as described above is usually 600 to 1000000, or 600 to 200000.
- the said polymer can mix and use another polymer within 30 mass% in all the polymers.
- These polymers include polyacrylic acid ester compounds, polymethacrylic acid ester compounds, polyacrylamide compounds, polymethacrylamide compounds, polyvinyl compounds, polystyrene compounds, polymaleimide compounds, polymaleic anhydrides, and polyacrylonitrile compounds.
- Examples of the raw material monomer for the polyacrylate compound include methyl acrylate, ethyl acrylate, isopropyl acrylate, benzyl acrylate, naphthyl acrylate, anthryl acrylate, anthryl methyl acrylate, phenyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2,2,2-trifluoroethyl acrylate, 4-hydroxybutyl acrylate, isobutyl acrylate, tert-butyl acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-methoxyethyl acrylate, methoxytriethylene glycol acrylate, 2-ethoxyethyl acrylate , Tetrahydrofurfuryl acrylate, 3-methoxybutyl acrylate 2-methyl-2-adamantyl acrylate, 2-ethyl-2-adamantyl acrylate, 2-propyl-2
- Examples of the raw material monomer for the polymethacrylate compound include ethyl methacrylate, normal propyl methacrylate, normal pentyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, naphthyl methacrylate, anthryl methacrylate, anthryl methyl methacrylate, phenyl methacrylate, 2-phenylethyl methacrylate, 2 -Hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2,2,2-trifluoroethyl methacrylate, 2,2,2-trichloroethyl methacrylate, methyl acrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, normal lauryl methacrylate Normal stearyl methacrylate , Methoxydiethylene glycol methacrylate, methoxypolyethylene glyco
- Examples of the raw material monomer of the polymethacrylic acid amide compound include methacrylamide, N-methyl methacrylamide, N-ethyl methacrylamide, N-benzyl methacrylamide, N-phenyl methacrylamide, and N, N-dimethyl methacrylamide. .
- Examples of the raw material monomer for the polyvinyl compound include vinyl ether, methyl vinyl ether, benzyl vinyl ether, 2-hydroxyethyl vinyl ether, phenyl vinyl ether, and propyl vinyl ether.
- Examples of the raw material monomer monomer for the polystyrene compound include styrene, methylstyrene, chlorostyrene, bromostyrene, and hydroxystyrene.
- Examples of the raw material monomer for the polymaleimide compound include maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide.
- polymers are produced by dissolving an addition polymerizable monomer and an optionally added chain transfer agent (10% or less based on the mass of the monomer) in an organic solvent, and then adding a polymerization initiator to perform a polymerization reaction. Thereafter, it can be produced by adding a polymerization terminator.
- the addition amount of the polymerization initiator is 1 to 10% with respect to the mass of the monomer, and the addition amount of the polymerization terminator is 0.01 to 0.2% by mass.
- organic solvent used examples include propylene glycol monomethyl ether, propylene glycol monopropyl ether, ethyl lactate, cyclohexanone, methyl ethyl ketone, and dimethylformamide, chain transfer agents such as dodecane thiol and dodecyl thiol, and polymerization initiators such as azo Examples thereof include bisisobutyronitrile and azobiscyclohexanecarbonitrile, and examples of the polymerization terminator include 4-methoxyphenol.
- the reaction temperature is appropriately selected from 30 to 100 ° C.
- the reaction time is appropriately selected from 1 to 48 hours.
- the resist underlayer film forming composition of the present invention can contain a crosslinking agent component.
- the cross-linking agent include melamine type, substituted urea type, or polymer type thereof.
- a cross-linking agent having at least two cross-linking substituents methoxymethylated glycoluril, butoxymethylated glycoluril, methoxymethylated melamine, butoxymethylated melamine, methoxymethylated benzogwanamine, butoxymethylated benzogwanamine, Compounds such as methoxymethylated urea, butoxymethylated urea, methoxymethylated thiourea, or methoxymethylated thiourea.
- the condensate of these compounds can also be used.
- a crosslinking agent having high heat resistance can be used as the crosslinking agent.
- a compound containing a crosslinking-forming substituent having an aromatic ring for example, a benzene ring or a naphthalene ring
- this compound include a compound having a partial structure represented by the following formula (4), and a polymer or oligomer having a repeating unit represented by the following formula (5).
- R 10 and R 11 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 20 carbon atoms, and n10 represents an integer of 1 to 4 N11 represents an integer of 1 to (5-n10), and (n10 + n11) represents an integer of 2 to 5.
- R 12 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
- R 13 represents an alkyl group having 1 to 10 carbon atoms
- n12 represents an integer of 1 to 4
- (n12 + n13) represents an integer of 1 to 4.
- Oligomers and polymers can be used in the range of 2 to 100 or 2 to 50 repeating unit structures.
- alkyl groups and aryl groups can exemplify the above alkyl groups and aryl groups.
- the above compounds can be obtained as products of Asahi Organic Materials Co., Ltd. and Honshu Chemical Industry Co., Ltd.
- the compound of the formula (4-21) can be obtained as Asahi Organic Materials Co., Ltd., trade name TM-BIP-A.
- the addition amount of the crosslinking agent varies depending on the coating solvent used, the base substrate used, the required solution viscosity, the required film shape, etc., but is 0.001 to 80% by mass, preferably based on the total solid content. 0.01 to 50% by mass, more preferably 0.05 to 40% by mass.
- cross-linking agents may cause a cross-linking reaction by self-condensation, but when a cross-linkable substituent is present in the above-mentioned polymer of the present invention, it can cause a cross-linking reaction with those cross-linkable substituents.
- p-toluenesulfonic acid as a catalyst for promoting the crosslinking reaction, p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonic acid, salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, hydroxybenzoic acid, naphthalenecarboxylic acid Acidic compounds such as acids or / and thermal acid generators such as 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate, and other organic sulfonic acid alkyl esters may be added. I can do it.
- the blending amount is 0.0001 to 20% by mass, preferably 0.0005 to 10% by mass, preferably 0.01 to 3% by mass, based on the total solid content.
- -Halogen-containing compound photoacid generators such as triazine, and sulfonic acid photoacid generators such as benzoin tosylate and N-hydroxysuccinimide trifluoromethanesulfonate.
- the photoacid generator is 0.2 to 10% by mass, preferably 0.4 to 5% by mass, based on the total solid content.
- the light absorbing agent examples include commercially available light absorbing agents described in “Technical Dye Technology and Market” (published by CMC) and “Dye Handbook” (edited by the Society of Synthetic Organic Chemistry), such as C.I. I. Disperse Yellow 1,3,4,5,7,8,13,23,31,49,50,51,54,60,64,66,68,79,82,88,90,93,102,114 and 124; C.I. I. D isperse Orange 1, 5, 13, 25, 29, 30, 31, 44, 57, 72 and 73; I. Disperse Red 1, 5, 7, 13, 17, 19, 43, 50, 54, 58, 65, 72, 73, 88, 117, 137, 143, 199 and 210; I.
- Disperse Violet 43; C.I. I. Disperse Blue 96; C.I. I. FluorescentesBrightening Agent 112, 135 and 163; I. Solvent Orange 2 and 45; I. Solvent Red 1, 3, 8, 23, 24, 25, 27 and 49; I. Pigment Green 10; C.I. I. Pigment Brown 2 or the like can be preferably used.
- the above light-absorbing agent is usually blended at a ratio of 10% by mass or less, preferably 5% by mass or less, based on the total solid content of the resist underlayer film material for lithography.
- the rheology modifier mainly improves the fluidity of the resist underlayer film forming composition, and improves the film thickness uniformity of the resist underlayer film and the fillability of the resist underlayer film forming composition inside the hole, particularly in the baking process. It is added for the purpose of enhancing.
- phthalic acid derivatives such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, and butyl isodecyl phthalate
- adipic acid derivatives such as dinormal butyl adipate, diisobutyl adipate, diisooctyl adipate, octyl decyl adipate
- 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
- 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 the total solid content of the resist underlayer film material
- the adhesion auxiliary agent is added mainly for the purpose of improving the adhesion between the substrate or resist and the resist underlayer film forming composition, and preventing the resist from being peeled off particularly during development.
- Specific examples include chlorosilanes such as trimethylchlorosilane, dimethylvinylchlorosilane, methyldiphenylchlorosilane, chloromethyldimethylchlorosilane, trimethylmethoxysilane, dimethyldiethoxysilane, methyldimethoxysilane, dimethylvinylethoxysilane, diphenyldimethoxysilane, Alkoxysilanes such as enyltriethoxysilane, hexamethyldisilazane, N, N'-bis (trimethylsilyl) urea, silazanes such as dimethyltrimethylsilylamine, trimethylsilylimidazole, vinyltrichlorosilane, ⁇ -chloropropyl
- 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 allyl 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 sol
- Nonionic surfactants such as polyoxyethylene sorbit
- the blending amount of these surfactants is usually 2.0% by mass or less, preferably 1.0% by mass or less, based on the total solid content of the resist underlayer film material for lithography of the present invention.
- These surfactants may be added alone or in combination of two or more.
- the solvent for dissolving the polymer and the crosslinking agent component, the crosslinking catalyst and the like 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 monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, propylene glycol monoethyl ether acetate, propylene glycol propyl ether acetate, toluene, xylene, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-hydroxypropionic acid Ethyl, 2-hydroxy- -Ethyl methyl propionate, ethyl ethioacetate, ethyl hydroxyacetate, 2-hydroxypropionic acid
- high boiling point solvents such as propylene glycol monobutyl ether and propylene glycol monobutyl ether acetate can be mixed and used.
- solvents propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, cyclohexanone and the like are preferable for improving the leveling property.
- the resist used in the present invention is a photoresist or an electron beam resist.
- the photoresist applied on the upper part of the resist underlayer film for lithography in the present invention either negative type or positive type can be used, and a positive type photoresist composed of a novolak resin and 1,2-naphthoquinonediazide sulfonic acid ester, depending on the acid.
- Chemically amplified photoresist comprising a binder having a group that decomposes to increase the alkali dissolution rate and a photoacid generator, a low molecular weight compound and photoacid that increases the alkali dissolution rate of the photoresist by decomposition with an alkali-soluble binder and acid
- Chemically amplified photoresist comprising a generator, comprising a binder having a group that decomposes with acid to increase the alkali dissolution rate, a low-molecular compound that decomposes with acid to increase the alkali dissolution rate of the photoresist, and a photoacid generator Chemically amplified photoresist with Si atoms in the skeleton
- a photoresist or the like which, for example, Rohm & Hearts Co., Ltd., and trade name APEX-E.
- an acid is generated by irradiation of a resin containing an Si-Si bond in the main chain and an aromatic ring at the terminal and an electron beam.
- a composition comprising an acid generator, or a composition comprising a poly (p-hydroxystyrene) having a hydroxy group substituted with an organic group containing N-carboxyamine, and an acid generator that generates an acid upon irradiation with an electron beam.
- the acid generated from the acid generator by electron beam irradiation reacts with the N-carboxyaminoxy group of the polymer side chain, and the polymer side chain decomposes into a hydroxy group and exhibits alkali solubility, thus exhibiting alkali development. It dissolves in the liquid to form a resist pattern.
- Acid generators that generate an acid upon irradiation with this electron beam are 1,1-bis [p-chlorophenyl] -2,2,2-trichloroethane, 1,1-bis [p-methoxyphenyl] -2,2,2 -Halogenated organic compounds such as trichloroethane, 1,1-bis [p-chlorophenyl] -2,2-dichloroethane, 2-chloro-6- (trichloromethyl) pyridine, triphenylsulfonium salts, diphenyliodonium salts, etc. Examples thereof include sulfonic acid esters such as onium salts, nitrobenzyl tosylate, and dinitrobenzyl tosylate.
- Alcohol aqueous solutions such as alcohol amines, quaternary ammonium salts such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, and cyclic amines such as pyrrole and piperidine can be used.
- an appropriate amount of an alcohol such as isopropyl alcohol or a nonionic surfactant may be added to the alkaline aqueous solution.
- preferred developers are quaternary ammonium salts, more preferably tetramethylammonium hydroxide and choline.
- a spinner, a coater, etc. are suitably used on a substrate (for example, a transparent substrate such as a silicon / silicon dioxide coating, a glass substrate, an ITO substrate) used for manufacturing a precision integrated circuit device.
- a substrate for example, a transparent substrate such as a silicon / silicon dioxide coating, a glass substrate, an ITO substrate
- the resist underlayer film forming composition After applying the resist underlayer film forming composition by a simple coating method, it is baked and cured to form a coating type underlayer film.
- the thickness of the resist underlayer film is preferably 0.01 to 3.0 ⁇ m.
- the conditions for baking after coating are 80 to 350 ° C. and 0.5 to 120 minutes.
- a good resist pattern can be obtained by performing, developing, rinsing and drying. If necessary, heating after irradiation with light or an electron beam (PEB: Post Exposure Bake) can also be performed. Then, the resist underlayer film where the resist has been developed and removed by the above process is removed by dry etching, and a desired pattern can be formed on the substrate.
- PEB Post Exposure Bake
- the exposure light in the photoresist is actinic radiation such as near ultraviolet, far ultraviolet, or extreme ultraviolet (for example, EUV, wavelength 13.5 nm), for example, 248 nm (KrF laser light), 193 nm (ArF laser light), Light having a wavelength such as 157 nm (F 2 laser light) is used.
- the light irradiation can be used without particular limitation as long as it can generate an acid from a photoacid generator, and the exposure dose is 1 to 2000 mJ / cm 2 , or 10 to 1500 mJ / cm 2 , or 50. Based on ⁇ 1000 mJ / cm 2 .
- the electron beam irradiation of an electron beam resist can be performed using an electron beam irradiation apparatus, for example.
- a step of forming the resist underlayer film on the semiconductor substrate with the resist underlayer film forming composition a step of forming a resist film thereon, a step of forming a resist pattern by light or electron beam irradiation and development, a resist pattern
- a semiconductor device can be manufactured through a step of etching the resist underlayer film and a step of processing the semiconductor substrate with the patterned resist underlayer film.
- the resist underlayer film for lithography which has a selection ratio of dry etching rates close to that of resist, is selected as a resist underlayer film for such processes, and a lower dry etching rate than resist.
- the substrate after forming the resist underlayer film of the present invention on the substrate, directly or on the resist underlayer film as needed, after forming one to several layers of coating material on the resist underlayer film, A resist can be applied. As a result, the pattern width of the resist becomes narrow, and even when the resist is thinly coated to prevent pattern collapse, the substrate can be processed by selecting an appropriate etching gas.
- a step of forming the resist underlayer film on the semiconductor substrate with the resist underlayer film forming composition and forming a hard mask by a coating material containing a silicon component or the like or a hard mask (for example, silicon nitride oxide) on the semiconductor substrate.
- a semiconductor device can be manufactured through a step of etching the resist underlayer film with an oxygen-based gas or a hydrogen-based gas and a step of processing a semiconductor substrate with a halogen-based gas with the patterned resist underlayer film.
- the resist underlayer film forming composition for lithography of the present invention has a light absorption site incorporated into the skeleton, so there is no diffused material in the photoresist during heating and drying. Moreover, since the light absorption site has a sufficiently large light absorption performance, the effect of preventing reflected light is high.
- the resist underlayer film forming composition for lithography according to the present invention has high thermal stability, can prevent contamination of the upper layer film by decomposition products during baking, and can provide a margin for the temperature margin of the baking process. is there. Furthermore, the resist underlayer film material for lithography according to the present invention has a function of preventing reflection of light depending on process conditions, and further prevents the interaction between the substrate and the photoresist, or a material or photoresist used for the photoresist. The film can be used as a film having a function of preventing an adverse effect on a substrate of a substance generated during exposure.
- Synthesis example 1 In a 200 ml three-necked flask, 8.36 g of carbazole (manufactured by Tokyo Chemical Industry Co., Ltd.), 7.21 g of 1-naphthol (manufactured by Tokyo Chemical Industry Co., Ltd.), 15.62 g of 1-naphthaldehyde (manufactured by Tokyo Chemical Industry Co., Ltd.), toluene ( 124.75 g (manufactured by Kanto Chemical) and 0.48 g of p-toluenesulfonic acid monohydrate (manufactured by Tokyo Chemical Industry Co., Ltd.) were added.
- Synthesis example 2 In a 200 ml three-necked flask, 11.70 g of carbazole (manufactured by Tokyo Chemical Industry Co., Ltd.), 4.32 g of 1-naphthol (manufactured by Tokyo Chemical Industry Co., Ltd.), 15.62 g of 1-naphthaldehyde (manufactured by Tokyo Chemical Industry Co., Ltd.), toluene ( 124.75 g (manufactured by Kanto Chemical) and 0.48 g of p-toluenesulfonic acid monohydrate (manufactured by Tokyo Chemical Industry Co., Ltd.) were added.
- the flask was purged with nitrogen, heated to 130 ° C., and stirred at reflux for about 9 hours.
- the reaction mixture was diluted with 32.06 g of tetrahydrofuran (manufactured by Kanto Chemical), and the precipitate was removed by filtration.
- the collected filtrate was dropped into a methanol / 28% aqueous ammonia (400 g / 3 g) mixed solution to cause reprecipitation.
- the obtained precipitate was suction filtered, and the filtrate was dried under reduced pressure at 85 ° C. overnight.
- 17.32g of carbazole resin of skin color powder was obtained.
- the obtained polymer corresponded to the formula (3-1).
- the weight average molecular weight Mw measured in terms of polystyrene by GPC was 4,500.
- the obtained polymer contained 70 mol% of the unit structure represented by the formula (1) and 30 mol% of the unit structure represented by the formula (2).
- Synthesis example 4 In a 100 ml three-necked flask, 0.50 g of carbazole (manufactured by Tokyo Chemical Industry Co., Ltd.), 3.89 g of 1-naphthol (manufactured by Tokyo Chemical Industry Co., Ltd.), 4.69 g of 1-naphthaldehyde (manufactured by Tokyo Chemical Industry Co., Ltd.), toluene ( Kanto Chemical Co., Ltd. (18.16 g) and p-toluenesulfonic acid monohydrate (Tokyo Chemical Industry Co., Ltd.) (0.14 g) were added. Thereafter, the flask was purged with nitrogen, heated to 130 ° C., and stirred at reflux for about 8 hours.
- the reaction mixture was diluted with 13.18 g of tetrahydrofuran (manufactured by Kanto Chemical), and the precipitate was removed by filtration.
- the collected filtrate was dropped into a methanol / 28% aqueous ammonia (110 g / 1 g) mixed solution to cause reprecipitation.
- the obtained precipitate was suction filtered, and the filtrate was dried under reduced pressure at 85 ° C. overnight.
- 4.08g of carbazole resin of brown powder was obtained.
- the obtained polymer corresponded to the formula (3-1).
- the weight average molecular weight Mw measured in terms of polystyrene by GPC was 2,400.
- the obtained polymer contained 10 mol% of the unit structure represented by the formula (1) and 90 mol% of the unit structure represented by the formula (2).
- Synthesis example 7 7.00 g of carbazole (manufactured by Tokyo Chemical Industry Co., Ltd.), 6.99 g of 1,5-dihydroxynaphthalene (manufactured by Tokyo Chemical Industry Co., Ltd.), 20.66 g of 1-pyrenecarboxaldehyde (manufactured by Aldrich), one p-toluenesulfonic acid After putting 0.83 g of a hydrate (manufactured by Tokyo Chemical Industry Co., Ltd.) into 82.79 g of toluene, the mixture was stirred at reflux for about 1 hour under a nitrogen stream.
- the reaction mixture was diluted with 55.80 g of tetrahydrofuran (manufactured by Kanto Chemical). After cooling the reaction solution, it was dropped into a methanol / 28% aqueous ammonia (700 g / 7 g) mixed solution to cause reprecipitation. The obtained precipitate was suction filtered, and the obtained powder was dried under reduced pressure at 85 ° C. overnight. Thereafter, 16.45 g of a polymer represented by the formula (3-3) was obtained. The weight average molecular weight of the obtained polymer was 1400 in terms of polystyrene. The obtained polymer contained 50 mol% of the unit structure represented by the formula (1) and 50 mol% of the unit structure represented by the formula (2).
- Synthesis example 8 1.50 g of carbazole (manufactured by Tokyo Chemical Industry Co., Ltd.), 5.60 g of 1,5-dihydroxynaphthalene (manufactured by Tokyo Chemical Industry Co., Ltd.), 10.63 g of 1-pyrenecarboxaldehyde (manufactured by Aldrich), one p-toluenesulfonic acid 0.91 g of a hydrate (manufactured by Tokyo Chemical Industry Co., Ltd.) was placed in 43.50 g of 1,4-dioxane, and then stirred under reflux for about 5 hours under a nitrogen stream.
- the reaction mixture was diluted with 27.42 g of tetrahydrofuran (manufactured by Kanto Chemical). After cooling the reaction solution, it was dropped into a methanol / 28% aqueous ammonia (700 g / 7 g) mixed solution to cause reprecipitation. The obtained precipitate was suction filtered, and the obtained powder was dried under reduced pressure at 85 ° C. overnight. Thereafter, 10.48 g of a polymer represented by the formula (3-3) was obtained. The weight average molecular weight of the obtained polymer was 2800 in terms of polystyrene. The obtained polymer contained 20 mol% of the unit structure represented by the formula (1) and 80 mol% of the unit structure represented by the formula (2).
- Synthesis Example 9 9.00 g of carbazole (manufactured by Tokyo Chemical Industry Co., Ltd.), 2.16 g of 1,5-dihydroxynaphthalene (manufactured by Tokyo Chemical Industry Co., Ltd.), 15.63 g of 1-pyrenecarboxaldehyde (manufactured by Aldrich), one p-toluenesulfonic acid After putting 0.54 g of hydrate (manufactured by Tokyo Chemical Industry Co., Ltd.) into 40.98 g of paraxylene, the mixture was stirred under reflux for about 5 hours under a nitrogen stream.
- Example 1 In 3 g of the resin obtained in Synthesis Example 1, 12 g of propylene glycol monomethyl ether acetate was dissolved to prepare a resist underlayer film forming composition solution for use in a lithography process using a multilayer film.
- Example 2 In 3 g of the resin obtained in Synthesis Example 2, 12 g of propylene glycol monomethyl ether acetate was dissolved to prepare a resist underlayer film forming composition solution for use in a lithography process using a multilayer film.
- Example 3 In 3 g of the resin obtained in Synthesis Example 3, 12 g of propylene glycol monomethyl ether acetate was dissolved to prepare a resist underlayer film forming composition solution for use in a lithography process using a multilayer film.
- Example 4 In 3 g of the resin obtained in Synthesis Example 4, 12 g of propylene glycol monomethyl ether acetate was dissolved to prepare a resist underlayer film forming composition solution for use in a lithography process using a multilayer film.
- Example 5 To 0.3 g of the resin obtained in Synthesis Example 1, 0.06 g of tetramethoxymethyl glycoluril as a cross-linking agent, 0.006 g of pyridinium paratoluene sulfonate as a catalyst, and 0.001 g of Megafac R-30 as a surfactant were mixed. It was dissolved in 2.53 g of propylene glycol monomethyl ether acetate, 0.84 g of propylene glycol monomethyl ether and 0.84 g of cyclohexanone to prepare a solution of a resist underlayer film forming composition for use in a lithography process using a multilayer film.
- Example 6 To 0.3 g of the resin obtained in Synthesis Example 2, 0.06 g of tetramethoxymethyl glycoluril as a cross-linking agent, 0.006 g of pyridinium paratoluene sulfonate as a catalyst, and 0.001 g of Megafac R-30 as a surfactant were mixed. It was dissolved in 2.53 g of propylene glycol monomethyl ether acetate, 0.84 g of propylene glycol monomethyl ether and 0.84 g of cyclohexanone to prepare a solution of a resist underlayer film forming composition for use in a lithography process using a multilayer film.
- Example 7 To 0.6 g of the resin obtained in Synthesis Example 3, 0.15 g of tetramethoxymethyl glycoluril as a cross-linking agent, 0.015 g of pyridinium paratoluene sulfonate as a catalyst, and 0.002 g of Megafac R-30 as a surfactant are mixed. Dissolved in 7.06 g of propylene glycol monomethyl ether acetate and 1.76 g of propylene glycol monomethyl ether, a solution of a resist underlayer film forming composition used in a lithography process using a multilayer film was prepared.
- Example 8 1.0 g of the resin obtained in Synthesis Example 5 was mixed with 0.20 g of tetramethoxymethylglycoluril as a cross-linking agent, 0.020 g of pyridinium paratoluenesulfonate as a catalyst, and 0.003 g of Megafac R-30 as a surfactant, It was dissolved in 3.97 g of propylene glycol monomethyl ether acetate, 3.96 g of propylene glycol monomethyl ether, and 11.90 of cyclohexanone to prepare a solution of a resist underlayer film forming composition for use in a lithography process using a multilayer film.
- Example 9 1.0 g of the resin obtained in Synthesis Example 6 was mixed with 0.25 g of tetramethoxymethylglycoluril as a cross-linking agent, 0.013 g of pyridinium paratoluenesulfonate as a catalyst, and 0.003 g of Megafac R-30 as a surfactant, It was dissolved in 3.97 g of propylene glycol monomethyl ether acetate, 3.96 g of propylene glycol monomethyl ether, and 11.90 of cyclohexanone to prepare a solution of a resist underlayer film forming composition for use in a lithography process using a multilayer film.
- Example 11 To 2.0 g of the resin obtained in Synthesis Example 8, 0.006 g of Megafac R-30 as a surfactant was mixed, and 3.97 g of propylene glycol monomethyl ether acetate, 2.16 g of propylene glycol monomethyl ether, and 18.84 of cyclohexanone. A solution of a resist underlayer film forming composition for use in a lithography process using a multilayer film was prepared by dissolution.
- Example 12 To 2.0 g of the resin obtained in Synthesis Example 9, 0.006 g of Megafac R-30 as a surfactant was mixed, and 3.97 g of propylene glycol monomethyl ether acetate, 2.16 g of propylene glycol monomethyl ether, and 18.84 of cyclohexanone. A solution of a resist underlayer film forming composition for use in a lithography process using a multilayer film was prepared by dissolution.
- Comparative Example 1 A solution of cresol novolac resin (commercially available product, weight average molecular weight of 4000) was used. (Measurement of optical parameters) The resist underlayer film solutions prepared in Examples 1 to 12 and Comparative Example 1 were applied onto a silicon wafer using a spin coater. The resist was baked on a hot plate at 240 ° C. for 1 minute (Examples 10 to 12 were 400 ° C. for 2 minutes) to form a resist underlayer film (film thickness 0.05 ⁇ m). These resist underlayer films were measured for refractive index (n value) and optical extinction coefficient (also called k value, attenuation coefficient) at a wavelength of 193 nm using a spectroscopic ellipsometer. The results are shown in Table 1.
- n value refractive index
- optical extinction coefficient also called k value, attenuation coefficient
- etching gases were used to measure the dry etching rate.
- RIE-10NR Sudco
- CF 4 The resist underlayer film forming composition solutions prepared in Examples 1 to 12 were applied onto a silicon wafer using a spin coater. Baking was carried out on a hot plate at 240 ° C. for 1 minute (however, in Examples 10 to 12 at 400 ° C. for 2 minutes) to form a resist underlayer film (film thickness 0.20 ⁇ m). The dry etching rate was measured using CF 4 gas as the etching gas. Further, the solution of Comparative Example 1 was applied onto a silicon wafer using a spin coater. The resist was baked on a hot plate at 240 ° C.
- the speed ratio (1) is a dry etching speed ratio of (resist underlayer film used in the example) / (resist underlayer film of Comparative Example 1).
- the resist underlayer film material used in the lithography process using the multilayer film of the present invention is different from the conventional high etch rate antireflection film, and the dry etching rate selection ratio close to the photoresist or smaller than the photoresist, the semiconductor It is possible to provide a resist underlayer film that has a lower dry etching rate selection ratio than that of the substrate and can also have an effect as an antireflection film.
- the film was baked at 400 ° C., and it was found that it has a function as a hard mask by comparing the dry etching rate ratio with a conventional phenol novolac resin. . It has been found that the lower layer film material of the present invention has heat resistance capable of forming a hard mask on the upper layer by vapor deposition.
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Abstract
Description
ポリビニルカルバゾールを用いたレジスト下層膜形成組成物が例示されている(特許文献1、特許文献2、及び特許文献3を参照)。
フルオレンフェノールノボラック樹脂を用いたレジスト下層膜形成組成物が開示されている(例えば、特許文献4参照)。
フルオレンナフトールノボラック樹脂を用いたレジスト下層膜形成組成物が開示されている(例えば、特許文献5参照)。
フルオレンフェノールとアリールアルキレンを繰り返し単位とする樹脂を含むレジスト下層膜形成組成物が開示されている(例えば、特許文献6、特許文献7参照)。
下記式(1):
式(2):
第3観点として、式(2)中、Arがナフタレン環を表し、R7、及びR9は水素原子を表し、R8がナフタレン環、又はピレン環を表す第1観点又は第2観点に記載のレジスト下層膜形成組成物、
第4観点として、更に架橋剤を含む第1観点乃至第3観点のいずれか一つに記載のレジスト下層膜形成組成物、
第5観点として、更に酸及び/又は酸発生剤を含む第1観点乃至第4観点のいずれか一つに記載のレジスト下層膜形成組成物、
第6観点として、第1観点乃至第5観点のいずれか一つに記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成することによって得られるレジスト下層膜、
第8観点として、半導体基板上に第1観点乃至第5観点のいずれか1項に記載のレジスト下層膜形成組成物により下層膜を形成する工程、その上にレジスト膜を形成する工程、光又は電子線の照射と現像によりパターン化されたレジスト膜を形成する工程、パターン化されたレジスト膜に従い該下層膜をエッチングする工程、及びパターン化された下層膜に従い半導体基板を加工する工程を含む半導体装置の製造方法、
第9観点として、半導体基板に第1観点乃至第5観点のいずれか1項に記載のレジスト下層膜形成組成物により下層膜を形成する工程、その上にハードマスクを形成する工程、更にその上にレジスト膜を形成する工程、光又は電子線の照射と現像によりパターン化されたレジスト膜を形成する工程、パターン化されたレジスト膜に従いハードマスクをエッチングする工程、パターン化されたハードマスクに従い該下層膜をエッチングする工程、及びパターン化された下層膜に従い半導体基板を加工する工程を含む半導体装置の製造方法、及び
第10観点として、ハードマスクが無機物の蒸着によるものである第9観点に記載の製造方法である。
本発明のレジスト下層膜形成組成物から得られるレジスト下層膜には基板からの反射を効率的に抑制する性能を付与することも可能であり、露光光の反射防止膜としての効果を併せ持つこともできる。
本発明のレジスト下層膜形成組成物により、レジストに近いドライエッチング速度の選択比、レジストに比べて小さいドライエッチング速度の選択比や半導体基板に比べて小さいドライエッチング速度の選択比を持つ、優れたレジスト下層膜を提供することができる。
本発明のレジスト下層膜形成組成物は、用いられるポリマーがカルバゾールノボラック系の単位構造を含むポリマーであるため、該組成物から得られるレジスト下層膜は極めて耐熱性が高いものである。
また、本発明のレジストパターンの形成方法によると、レジスト下層膜として上記組成物から得られた膜を使用することにより良好な形状のレジストパターンを精度良く形成することができる。
そして、本発明のレジスト下層膜は、平坦化膜、レジスト下層膜、レジスト層の汚染防止膜、ドライエッチ選択性を有する膜として用いることができる。これにより、半導体製造のリソグラフィープロセスにおけるレジストパターン形成を、容易に、精度良く行うことができるようになる。
本発明において上記のリソグラフィー用レジスト下層膜形成組成物は上記ポリマーと溶剤を含む。そして、架橋剤と酸を含むことができ、必要に応じて酸発生剤、界面活性剤等の添加剤を含むことができる。この組成物の固形分は0.1~70質量%、または0.1~60質量%である。固形分はレジスト下層膜形成組成物から溶剤を除いた全成分の含有割合である。固形分中に上記ポリマーを1~100質量%、または1~99.9質量%、または50~99.9質量%、または50~95質量%、または50~90質量%の割合で含有することができる。
本発明に用いられるポリマーは、重量平均分子量が600~1000000、又は600~200000である。
R3は水素原子、炭素原子数1~10のアルキル基、炭素原子数2~10のアルケニル基、又は炭素原子数6~40のアリール基とすることができ、またエーテル結合、ケトン結合、若しくはエステル結合を含んでいても良いそれら官能基の組み合わせとすることができる。
R4は水素原子とすることができ、またハロゲン原子、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い炭素原子数6~40のアリール基、又は複素環基とすることができる。
R5は水素原子とすることができ、またハロゲン原子、ニトロ基、アミノ基、若しくはヒドロキシ基で置換されていても良い炭素原子数1~10のアルキル基、炭素原子数6~40のアリール基、又は複素環基とすることができる。R4とR5は互いに環を形成していても良い。これらの環としては例えばR4とR5がそれぞれフルオレンの9位に結合した構造を有することができる。n1及びn2はそれぞれ1~3の整数を表す。
R8は水素原子とすることができ、またハロゲン原子、ニトロ基、アミノ基若しくはヒドロキシ基で置換されていても良い炭素原子数6~40のアリール基、又は複素環基とすることができる。
R9は水素原子とすることができ、またハロゲン原子、ニトロ基、アミノ基、若しくはヒドロキシ基で置換されていても良い炭素原子数1~10のアルキル基、炭素原子数6~40のアリール基、又は複素環基とすることができる。R8とR9は互いに環を形成していても良い。n6は1~pの整数を表し、n7はp-n6の整数を表す。ここでpは芳香族環基Arに置換しうる最大の数を表す。
Arはベンゼン環、ナフタレン環、アントラセン環等を示し、特にナフタレン環が好ましい。Arがベンゼン環の場合はn6は1~4の整数を表し、n7は〔4-(n6)〕の整数を表す。ナフタレン環の場合はn6は1~6の整数を表し、n7は〔6-(n6)〕の整数を表す。アントラセン環の場合はn6は1~8の整数を表し、n7は〔8-(n6)〕の整数を表す。
炭素原子数1~10のアルキル基としてはメチル基、エチル基、n-プロピル基、i-プロピル基、シクロプロピル基、n-ブチル基、i-ブチル基、s-ブチル基、t-ブチル基、シクロブチル基、1-メチル-シクロプロピル基、2-メチル-シクロプロピル基、n-ペンチル基、1-メチル-n-ブチル基、2-メチル-n-ブチル基、3-メチル-n-ブチル基、1,1-ジメチル-n-プロピル基、1,2-ジメチル-n-プロピル基、2,2-ジメチル-n-プロピル基、1-エチル-n-プロピル基、シクロペンチル基、1-メチル-シクロブチル基、2-メチル-シクロブチル基、3-メチル-シクロブチル基、1,2-ジメチル-シクロプロピル基、2,3-ジメチル-シクロプロピル基、1-エチル-シクロプロピル基、2-エチル-シクロプロピル基、n-ヘキシル基、1-メチル-n-ペンチル基、2-メチル-n-ペンチル基、3-メチル-n-ペンチル基、4-メチル-n-ペンチル基、1,1-ジメチル-n-ブチル基、1,2-ジメチル-n-ブチル基、1,3-ジメチル-n-ブチル基、2,2-ジメチル-n-ブチル基、2,3-ジメチル-n-ブチル基、3,3-ジメチル-n-ブチル基、1-エチル-n-ブチル基、2-エチル-n-ブチル基、1,1,2-トリメチル-n-プロピル基、1,2,2-トリメチル-n-プロピル基、1-エチル-1-メチル-n-プロピル基、1-エチル-2-メチル-n-プロピル基、シクロヘキシル基、1-メチル-シクロペンチル基、2-メチル-シクロペンチル基、3-メチル-シクロペンチル基、1-エチル-シクロブチル基、2-エチル-シクロブチル基、3-エチル-シクロブチル基、1,2-ジメチル-シクロブチル基、1,3-ジメチル-シクロブチル基、2,2-ジメチル-シクロブチル基、2,3-ジメチル-シクロブチル基、2,4-ジメチル-シクロブチル基、3,3-ジメチル-シクロブチル基、1-n-プロピル-シクロプロピル基、2-n-プロピル-シクロプロピル基、1-i-プロピル-シクロプロピル基、2-i-プロピル-シクロプロピル基、1,2,2-トリメチル-シクロプロピル基、1,2,3-トリメチル-シクロプロピル基、2,2,3-トリメチル-シクロプロピル基、1-エチル-2-メチル-シクロプロピル基、2-エチル-1-メチル-シクロプロピル基、2-エチル-2-メチル-シクロプロピル基及び2-エチル-3-メチル-シクロプロピル基等が挙げられる。
式(1)のR1、R2、R3、及びR5が水素原子を表し、R4がナフタレン環、又はピレン環を表す場合を好ましく用いることができる。
本発明に用いられるカルバゾール類としては、例えばカルバゾール、1,3,6,8-テトラニトロカルバゾール、3,6-ジアミノカルバゾール、3,6-ジブロモ-9-エチルカルバゾール、3,6-ジブロモ-9-フェニルカルバゾール、3,6-ジブロモカルバゾール、3,6-ジクロロカルバゾール、3-アミノ-9-エチルカルバゾール、3-ブロモ-9-エチルカルバゾール、4,4’ビス(9H-カルバゾール-9-イル)ビフェニル、4-グリシジルカルバゾール、4-ヒドロキシカルバゾール、9-(1H-ベンゾトリアゾール-1-イルメチル)-9H-カルバゾール、9-アセチル-3,6-ジヨードカルバゾール、9-ベンゾイルカルバゾール、9-ベンゾイルカルバゾール-6-ジカルボキシアルデヒド、9-ベンジルカルバゾール-3-カルボキシアルデヒド、9-メチルカルバゾール、9-フェニルカルバゾール、9-ビニルカルバゾール、カルバゾールカリウム、カルバゾール-N-カルボニルクロリド、N-エチルカルバゾール-3-カルボキシアルデヒド、N-((9-エチルカルバゾール-3-イル)メチレン)-2-メチル-1-インドリニルアミン等が挙げられ、これらを単独で用いることも2種以上組み合わせて用いることもできる。
縮合時の反応温度は通常40℃~200℃である。反応時間は反応温度によって種々選択されるが、通常30分~50時間程度である。
以上のようにして得られる重合体の重量平均分子量Mwは、通常600~1000000、又は600~200000である。
それらポリマーとしてはポリアクリル酸エステル化合物、ポリメタクリル酸エステル化合物、ポリアクリルアミド化合物、ポリメタクリルアミド化合物、ポリビニル化合物、ポリスチレン化合物、ポリマレイミド化合物、ポリマレイン酸無水物、及びポリアクリロニトリル化合物が挙げられる。
アクリルアミド化合物としては、アクリルアミド、N-メチルアクリルアミド、N-エチルアクリルアミド、N-ベンジルアクリルアミド、N-フェニルアクリルアミド、及びN,N-ジメチルアクリルアミド等が挙げられる。
ポリスチレン化合物の原料モノマーとしては、スチレン、メチルスチレン、クロロスチレン、ブロモスチレン、及びヒドロキシスチレン等が挙げられる。
ポリマレイミド化合物の原料モノマーとしては、マレイミド、N-メチルマレイミド、N-フェニルマレイミド、及びN-シクロヘキシルマレイミド等が挙げられる。
この化合物は下記式(4)で表される部分構造を有する化合物や、下記式(5)で表される繰り返し単位を有するポリマー又はオリゴマーが挙げられる。
式(4)中、R10及びR11はそれぞれ独立して水素原子、炭素原子数1~10のアルキル基、又は炭素原子数6~20のアリール基を表し、n10は1~4の整数を表し、n11は1~(5-n10)の整数を表し、(n10+n11)は2~5の整数を表す。
式(5)中、R12は水素原子又は炭素原子数1~10のアルキル基を表し、R13は炭素原子数1~10のアルキル基を表し、n12は1~4の整数を表し、n13は0~(4-n12)を表し、(n12+n13)は1~4の整数を表す。オリゴマー及びポリマーは繰り返し単位構造の数が2~100、又は2~50の範囲で用いることができる。
架橋剤の添加量は、使用する塗布溶剤、使用する下地基板、要求される溶液粘度、要求される膜形状などにより変動するが、全固形分に対して0.001~80質量%、好ましくは 0.01~50質量%、さらに好ましくは0.05~40質量%である。これら架橋剤は自己縮合による架橋反応を起こすこともあるが、本発明の上記のポリマー中に架橋性置換基が存在する場合は、それらの架橋性置換基と架橋反応を起こすことができる。
本発明に用いられるレジストとはフォトレジストや電子線レジストである。
また電子線レジストの電子線照射は、例えば電子線照射装置を用い照射することができる。
さらに、本発明のリソグラフィー用レジスト下層膜材料は、プロセス条件によっては、光の反射を防止する機能と、更には基板とフォトレジストとの相互作用の防止或いはフォトレジストに用いられる材料又はフォトレジストへの露光時に生成する物質の基板への悪作用を防ぐ機能とを有する膜としての使用が可能である。
200ml三口フラスコにカルバゾール(東京化成工業株式会社製)8.36g、1-ナフトール(東京化成工業株式会社製)7.21g、1-ナフトアルデヒド(東京化成工業株式会社製)15.62g、トルエン(関東化学製)124.75g、p-トルエンスルホン酸一水和物(東京化成工業株式会社製)0.48gを入れた。その後フラスコ内を窒素置換した後130℃まで加熱し、約9時間還流撹拌した。反応終了後、テトラヒドロフラン(関東化学製)31.14gで希釈し、沈殿物をろ過により除去した。回収したろ液をメタノール/28%アンモニア水(389g/3g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、肌色粉末のカルバゾール樹脂を17.45g得た。得られたポリマーは式(3-1)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、4,200であった。得られたポリマーは式(1)で表される単位構造を50モル%、式(2)で表される単位構造を50モル%の割合で含有していた。
200ml三口フラスコにカルバゾール(東京化成工業株式会社製)11.70g、1-ナフトール(東京化成工業株式会社製)4.32g、1-ナフトアルデヒド(東京化成工業株式会社製)15.62g、トルエン(関東化学製)124.75g、p-トルエンスルホン酸一水和物(東京化成工業株式会社製)0.48gを入れた。その後フラスコ内を窒素置換した後130℃まで加熱し、約9時間還流撹拌した。反応終了後、テトラヒドロフラン(関東化学製)32.06gで希釈し、沈殿物をろ過により除去した。回収したろ液をメタノール/28%アンモニア水(400g/3g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、肌色粉末のカルバゾール樹脂を17.32g得た。得られたポリマーは式(3-1)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、4,500であった。得られたポリマーは式(1)で表される単位構造を70モル%、式(2)で表される単位構造を30モル%の割合で含有していた。
200ml三口フラスコにカルバゾール(東京化成工業株式会社製)5.18g、1-ナフトール(東京化成工業株式会社製)10.43g、1-ナフトアルデヒド(東京化成工業株式会社製)16.14g、トルエン(関東化学製)127.00g、p-トルエンスルホン酸一水和物(東京化成工業株式会社製)0.49gを入れた。その後フラスコ内を窒素置換した後130℃まで加熱し、約8時間還流撹拌した。反応終了後、テトラヒドロフラン(関東化学製)31.22gで希釈し、沈殿物をろ過により除去した。回収したろ液をメタノール/28%アンモニア水(390g/3g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、茶色粉末のカルバゾール樹脂を9.24g得た。得られたポリマーは式(3-1)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、2,700であった。得られたポリマーは式(1)で表される単位構造を30モル%、式(2)で表される単位構造を70モル%の割合で含有していた。
100ml三口フラスコにカルバゾール(東京化成工業株式会社製)0.50g、1-ナフトール(東京化成工業株式会社製)3.89g、1-ナフトアルデヒド(東京化成工業株式会社製)4.69g、トルエン(関東化学製)18.16g、p-トルエンスルホン酸一水和物(東京化成工業株式会社製)0.14gを入れた。その後フラスコ内を窒素置換した後130℃まで加熱し、約8時間還流撹拌した。反応終了後、テトラヒドロフラン(関東化学製)13.18gで希釈し、沈殿物をろ過により除去した。回収したろ液をメタノール/28%アンモニア水(110g/1g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、ろ物を85℃で一晩減圧乾燥した。そして、茶色粉末のカルバゾール樹脂を4.08g得た。得られたポリマーは式(3-1)に相当した。GPCによりポリスチレン換算で測定される重量平均分子量Mwは、2,400であった。得られたポリマーは式(1)で表される単位構造を10モル%、式(2)で表される単位構造を90モル%の割合で含有していた。
カルバゾール(東京化成工業株式会社製)6.00gと1,6-ジヒドロキシナフタレン(東京化成工業株式会社製)3.83g、1-ナフトアルデヒド(東京化成工業株式会社製)9.43gを2-n-ブトキシエタノール47.18gに溶解させた後、窒素気流下100℃に加熱して20時間反応させた。反応溶液を冷却後、メタノールに滴下して再沈殿を行い、得られた個体を加熱乾燥して式(3-2)で表されるポリマーを得た。得られたポリマーの重量平均分子量はポリスチレン換算で2600であった。得られたポリマーは式(1)で表される単位構造を60モル%、式(2)で表される単位構造を40モル%の割合で含有していた。
カルバゾール(東京化成工業株式会社製)4.00gと1,6-ジヒドロキシナフタレン(東京化成工業株式会社製)8.94g、1-ナフトアルデヒド(東京化成工業株式会社製)12.58gを2-n-ブトキシエタノール50.05gに溶解させた後、窒素気流下130℃に加熱して24時間反応させた。反応溶液を冷却後、メタノール/水(8/2)の混合溶媒に滴下して再沈殿を行い、得られた個体を加熱乾燥して式(3-2)で表されるポリマーを得た。得られたポリマーの重量平均分子量はポリスチレン換算で1300であった。得られたポリマーは式(1)で表される単位構造を30モル%、式(2)で表される単位構造を70モル%の割合で含有していた。
カルバゾール(東京化成工業株式会社製)7.00gと1,5-ジヒドロキシナフタレン(東京化成工業株式会社製)6.99g、1-ピレンカルボキシアルデヒド(アルドリッチ製)20.66g、p-トルエンスルホン酸一水和物(東京化成工業株式会社製)0.83gをトルエン82.79gに入れた後、窒素気流下約1時間還流撹拌した。反応終了後、テトラヒドロフラン(関東化学製)55.80gで希釈した。反応溶液を冷却後、メタノール/28%アンモニア水(700g/7g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、得られた粉末を85℃で一晩減圧乾燥した。その後、式(3-3)で表されるポリマーを16.45g得た。得られたポリマーの重量平均分子量はポリスチレン換算で1400であった。得られたポリマーは式(1)で表される単位構造を50モル%、式(2)で表される単位構造を50モル%の割合で含有していた。
カルバゾール(東京化成工業株式会社製)1.50gと1,5-ジヒドロキシナフタレン(東京化成工業株式会社製)5.60g、1-ピレンカルボキシアルデヒド(アルドリッチ製)10.63g、p-トルエンスルホン酸一水和物(東京化成工業株式会社製)0.91gを1,4-ジオキサン43.50gに入れた後、窒素気流下約5時間還流撹拌した。反応終了後、テトラヒドロフラン(関東化学製)27.42gで希釈した。反応溶液を冷却後、メタノール/28%アンモニア水(700g/7g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、得られた粉末を85℃で一晩減圧乾燥した。その後、式(3-3)で表されるポリマーを10.48g得た。得られたポリマーの重量平均分子量はポリスチレン換算で2800であった。得られたポリマーは式(1)で表される単位構造を20モル%、式(2)で表される単位構造を80モル%の割合で含有していた。
カルバゾール(東京化成工業株式会社製)9.00gと1,5-ジヒドロキシナフタレン(東京化成工業株式会社製)2.16g、1-ピレンカルボキシアルデヒド(アルドリッチ製)15.63g、p-トルエンスルホン酸一水和物(東京化成工業株式会社製)0.54gをパラキシレン40.98gに入れた後、窒素気流下約5時間還流撹拌した。反応終了後、テトラヒドロフラン(関東化学製)66.15gで希釈した。反応溶液を冷却後、メタノール/28%アンモニア水(700g/7g)混合溶液中に滴下し、再沈殿させた。得られた沈殿物を吸引ろ過し、得られた粉末を85℃で一晩減圧乾燥した。その後、式(3-3)で表されるポリマー21.41gを得た。得られたポリマーの重量平均分子量はポリスチレン換算で5900であった。得られたポリマーは式(1)で表される単位構造を80モル%、式(2)で表される単位構造を20モル%の割合で含有していた。
合成例1で得た樹脂3g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12gに溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例2で得た樹脂3g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12gに溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例3で得た樹脂3g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12gに溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例4で得た樹脂3g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12gに溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例1で得た樹脂0.3gに、架橋剤としてテトラメトキシメチルグリコールウリル0.06g、触媒としてピリジニウムパラトルエンスルホネート0.006g、界面活性剤としてメガファックR-30を0.001g混合し、プロピレングリコールモノメチルエーテルアセテート2.53g、プロピレングリコールモノメチルエーテル0.84g、シクロヘキサノン0.84gに溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例2で得た樹脂0.3gに、架橋剤としてテトラメトキシメチルグリコールウリル0.06g、触媒としてピリジニウムパラトルエンスルホネート0.006g、界面活性剤としてメガファックR-30を0.001g混合し、プロピレングリコールモノメチルエーテルアセテート2.53g、プロピレングリコールモノメチルエーテル0.84g、シクロヘキサノン0.84gに溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例3で得た樹脂0.6gに、架橋剤としてテトラメトキシメチルグリコールウリル0.15g、触媒としてピリジニウムパラトルエンスルホネート0.015g、界面活性剤としてメガファックR-30を0.002g混合し、プロピレングリコールモノメチルエーテルアセテート7.06g、プロピレングリコールモノメチルエーテル1.76gに溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例5で得た樹脂1.0gに、架橋剤としてテトラメトキシメチルグリコールウリル0.20g、触媒としてピリジニウムパラトルエンスルホネート0.020g、界面活性剤としてメガファックR-30を0.003g混合し、プロピレングリコールモノメチルエーテルアセテート3.97g、プロピレングリコールモノメチルエーテル3.96g、シクロヘキサノン11.90に溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例6で得た樹脂1.0gに、架橋剤としてテトラメトキシメチルグリコールウリル0.25g、触媒としてピリジニウムパラトルエンスルホネート0.013g、界面活性剤としてメガファックR-30を0.003g混合し、プロピレングリコールモノメチルエーテルアセテート3.97g、プロピレングリコールモノメチルエーテル3.96g、シクロヘキサノン11.90に溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例7で得た樹脂2.0gに、界面活性剤としてメガファックR-30を0.006g混合し、プロピレングリコールモノメチルエーテルアセテート3.97g、プロピレングリコールモノメチルエーテル2.16g、シクロヘキサノン18.84に溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例8で得た樹脂2.0gに、界面活性剤としてメガファックR-30を0.006g混合し、プロピレングリコールモノメチルエーテルアセテート3.97g、プロピレングリコールモノメチルエーテル2.16g、シクロヘキサノン18.84に溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
合成例9で得た樹脂2.0gに、界面活性剤としてメガファックR-30を0.006g混合し、プロピレングリコールモノメチルエーテルアセテート3.97g、プロピレングリコールモノメチルエーテル2.16g、シクロヘキサノン18.84に溶解させ、多層膜によるリソグラフィープロセスに用いるレジスト下層膜形成組成物の溶液を調製した。
クレゾールノボラック樹脂(市販品、重量平均分子量は4000)の溶液を使用した。
(光学パラメータの測定)
実施例1~12、比較例1で調製したレジスト下層膜溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間(実施例10~12は400℃2分間)焼成し、レジスト下層膜(膜厚0.05μm)を形成した。これらのレジスト下層膜を、分光エリプソメーターを用いて波長193nmでの屈折率(n値)及び光学吸光係数(k値、減衰係数とも呼ぶ)を測定した。結果を表1に示した。
実施例1~12、比較例1で調製したレジスト下層膜溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間(実施例10~12は400℃2分間)焼成し、レジスト下層膜(膜厚0.20μm)を形成した。これらのレジスト下層膜をレジストに使用する溶剤、例えば乳酸エチル、ならびにプロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、シクロヘキサノンに対する浸漬試験を行った。
(ドライエッチング速度の測定)
RIE-10NR(サムコ製):CF4
実施例1~12で調製したレジスト下層膜形成組成物の溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間(ただし実施例10~実施例12は400℃2分間)焼成し、レジスト下層膜(膜厚0.20μm)を形成した。エッチングガスとしてCF4ガスを使用してドライエッチング速度を測定した。
また、比較例1の溶液を、スピンコーターを用いてシリコンウェハー上に塗布した。ホットプレート上で240℃1分間焼成し、レジスト下層膜(膜厚0.20μm)を形成した。エッチングガスとしてCF4ガスを使用してドライエッチング速度を測定し、実施例1~12のレジスト下層膜のドライエッチング速度との比較を行った。結果を表2に示した。速度比(1)は(実施例で用いたレジスト下層膜)/(比較例1のレジスト下層膜)のドライエッチング速度比である。
本発明の下層膜材料は上層に蒸着でハードマスクを形成可能な耐熱性を有することが判った。
Claims (10)
- 下記式(1):
式(2):
- 式(1)中、R1、R2、R3、及びR5が水素原子を表し、R4がナフタレン環、又はピレン環を表す請求項1に記載のレジスト下層膜形成組成物。
- 式(2)中、Arがナフタレン環を表し、R7、及びR9は水素原子を表し、R8がナフタレン環、又はピレン環を表す請求項1又は請求項2に記載のレジスト下層膜形成組成物。
- 更に架橋剤を含む請求項1乃至請求項3のいずれか1項に記載のレジスト下層膜形成組成物。
- 更に酸及び/又は酸発生剤を含む請求項1乃至請求項4のいずれか1項に記載のレジスト下層膜形成組成物。
- 請求項1乃至請求項5のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成することによって得られるレジスト下層膜。
- 請求項1乃至請求項5のいずれか1項に記載のレジスト下層膜形成組成物を半導体基板上に塗布し焼成して下層膜を形成する工程を含む半導体の製造に用いられるレジストパターンの形成方法。
- 半導体基板上に請求項1乃至請求項5のいずれか1項に記載のレジスト下層膜形成組成物により下層膜を形成する工程、その上にレジスト膜を形成する工程、光又は電子線の照射と現像によりパターン化されたレジスト膜を形成する工程、パターン化されたレジスト膜に従い該下層膜をエッチングする工程、及びパターン化された下層膜に従い半導体基板を加工する工程を含む半導体装置の製造方法。
- 半導体基板に請求項1乃至請求項5のいずれか1項に記載のレジスト下層膜形成組成物により下層膜を形成する工程、その上にハードマスクを形成する工程、更にその上にレジスト膜を形成する工程、光又は電子線の照射と現像によりパターン化されたレジスト膜を形成する工程、パターン化されたレジスト膜に従いハードマスクをエッチングする工程、パターン化されたハードマスクに従い該下層膜をエッチングする工程、及びパターン化された下層膜に従い半導体基板を加工する工程を含む半導体装置の製造方法。
- ハードマスクが無機物の蒸着によるものである請求項9に記載の製造方法。
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Also Published As
Publication number | Publication date |
---|---|
JPWO2012077640A1 (ja) | 2014-05-19 |
CN103229104A (zh) | 2013-07-31 |
TW201241569A (en) | 2012-10-16 |
EP2650729A4 (en) | 2014-07-16 |
KR101909222B1 (ko) | 2018-10-17 |
US20130280913A1 (en) | 2013-10-24 |
EP2650729A1 (en) | 2013-10-16 |
TWI554835B (zh) | 2016-10-21 |
KR20130130005A (ko) | 2013-11-29 |
CN103229104B (zh) | 2016-08-24 |
JP5867732B2 (ja) | 2016-02-24 |
US9263285B2 (en) | 2016-02-16 |
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