WO2024075720A1 - レジスト下層膜形成用組成物 - Google Patents
レジスト下層膜形成用組成物 Download PDFInfo
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- WO2024075720A1 WO2024075720A1 PCT/JP2023/036038 JP2023036038W WO2024075720A1 WO 2024075720 A1 WO2024075720 A1 WO 2024075720A1 JP 2023036038 W JP2023036038 W JP 2023036038W WO 2024075720 A1 WO2024075720 A1 WO 2024075720A1
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- underlayer film
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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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- 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
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
- C08G65/38—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols
- C08G65/40—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives derived from phenols from phenols (I) and other compounds (II), e.g. OH-Ar-OH + X-Ar-X, where X is halogen atom, i.e. leaving group
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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
- G03F7/20—Exposure; Apparatus therefor
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- H10P76/2041—
Definitions
- the present invention relates to a composition for forming a resist underlayer film, a resist underlayer film, a laminate, a method for manufacturing a semiconductor device, and a method for forming a pattern.
- microfabrication by lithography using a resist composition has been performed.
- the microfabrication is a processing method in which a thin film of a photoresist composition is formed on a semiconductor substrate such as a silicon wafer, and the thin film is irradiated with active light such as ultraviolet light through a mask pattern on which a device pattern is drawn, developed, and the substrate is etched using the obtained photoresist pattern as a protective film, thereby forming fine irregularities on the substrate surface corresponding to the photoresist pattern.
- Patent Document 1 discloses a composition for forming an underlayer film for lithography that contains a naphthalene ring having a halogen atom.
- Patent Document 2 discloses a halogenated anti-reflective film.
- Patent Document 3 discloses a composition for forming a resist underlayer film.
- the present invention has been made in consideration of the above circumstances, and aims to provide a composition for forming a resist underlayer film capable of forming a resist underlayer film that can increase the sensitivity of a resist, as well as a method for manufacturing a resist underlayer film, a laminate, and a semiconductor element, and a method for forming a pattern, using the composition for forming a resist underlayer film.
- a composition for forming a resist underlayer film for EB or EUV lithography comprising: A composition for forming a resist underlayer film, comprising a polymer having a structure represented by the following formula (1) and a solvent:
- R 1 and R 2 each independently represent an alkyl group having 1 to 6 carbon atoms which may be substituted with a halogen atom, or a halogen atom.
- m1 and m2 each independently represent an integer of 0 to 4. When there are two or more R 1s , the two or more R 1s may be the same or different.
- R2 is two or more, the two or more R2 may be the same or different.
- n1 and n2 each independently represent 0 or 1.
- Q 1 is represented by the following formula (1-1-1):
- Z1 represents a single bond, an alkylene group having 1 to 6 carbon atoms which may be substituted with a halogen atom, or a sulfonyl group.
- R 11 and R 12 each independently represent an alkyl group having 1 to 13 carbon atoms which may be substituted with a halogen atom, a hydroxyl group, a methoxy group, a thiol group, an acetyl group, a nitro group, an allyl group, a phenyl group, a naphthyl group, or a halogen atom.
- n11 and n12 each independently represent an integer of 0 to 4. When there are two or more R 11 s , the two or more R 11 s may be the same or different. When R 12 is two or more, the two or more R 12 may be the same or different.
- the crosslinking agent is a compound having two or more structures represented by the following formula (C): (In formula (C), R 101 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxyalkyl group having 2 to 6 carbon atoms.
- a resist underlayer film which is a cured product of the composition for forming a resist underlayer film according to any one of [1] to [6].
- a semiconductor substrate [7] The resist underlayer film according to the present invention; A laminate comprising: [9] A step of forming a resist underlayer film on a semiconductor substrate using the composition for forming a resist underlayer film according to any one of [1] to [6]; forming a resist film on the resist underlayer film;
- a method for manufacturing a semiconductor device comprising: [10] A step of forming a resist underlayer film on a semiconductor substrate using the composition for forming a resist underlayer film according to any one of [1] to [6]; forming a resist film on the resist underlayer film; irradiating the resist film with EB or EUV, and then developing the resist film to obtain a resist pattern; Etching the resist underlayer film using the resist pattern as a mask;
- a pattern forming method comprising:
- the present invention provides a composition for forming a resist underlayer film capable of forming a resist underlayer film that can increase the sensitivity of a resist, as well as a method for producing a resist underlayer film, a laminate, and a semiconductor element, and a method for forming a pattern, using the composition for forming a resist underlayer film.
- composition for forming a resist underlayer film of the present invention is a composition for forming a resist underlayer film for EB (electron beam) or EUV (extreme ultraviolet) lithography.
- the composition for forming a resist underlayer film contains a polymer (A) and a solvent.
- the polymer (A) has a structure represented by the following formula (1).
- R 1 and R 2 each independently represent an alkyl group having 1 to 6 carbon atoms which may be substituted with a halogen atom, or a halogen atom.
- m1 and m2 each independently represent an integer of 0 to 4. When there are two or more R 1s , the two or more R 1s may be the same or different. When R2 is two or more, the two or more R2 may be the same or different. * represents a bond.
- alkyl group having 1 to 6 carbon atoms which may be substituted with a halogen atom in R 1 and R 2 include alkyl groups having 1 to 6 carbon atoms.
- alkyl group having 1 to 6 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, a cyclopropyl group, an n-butyl group, an i-butyl group, an s-butyl group, a t-butyl group, a cyclobutyl group, a 1-methyl-cyclopropyl group, a 2-methyl-cyclopropyl group, an n-pentyl group, a 1-methyl-n-butyl group, a 2-methyl-n-butyl group, a 3-methyl-n-butyl group, a 1,1-dimethyl-n-propyl group, a 1,2-dimethyl-n-propyl group,
- Examples of the structure represented by formula (1) include the following structures. (In the formula, * represents a bond.)
- the bond * in the structure represented by formula (1) is, for example, bonded to a heteroatom.
- heteroatoms include an oxygen atom and a nitrogen atom.
- the polymer (A) may have at least one of the repeating structure represented by the following formula (1-1) and the repeating unit represented by the following formula (1-2) as a repeating unit having the structure represented by formula (1).
- the polymer (A) preferably has a repeating unit represented by the following formula (1-1) as a repeating unit having a structure represented by formula (1).
- R 1 and R 2 each independently represent an alkyl group having 1 to 6 carbon atoms which may be substituted with a halogen atom, or a halogen atom.
- m1 and m2 each independently represent an integer of 0 to 4. When there are two or more R 1s , the two or more R 1s may be the same or different. When R2 is two or more, the two or more R2 may be the same or different.
- Q1 represents a divalent organic group having an aromatic hydrocarbon ring.
- n1 and n2 each independently represent 0 or 1.
- Q1 in formula (1-1) is preferably represented by the following formula (1-1-1).
- Z1 represents a single bond, an alkylene group having 1 to 6 carbon atoms which may be substituted with a halogen atom, or a sulfonyl group.
- R 11 and R 12 each independently represent an alkyl group having 1 to 13 carbon atoms which may be substituted with a halogen atom, a hydroxyl group, a methoxy group, a thiol group, an acetyl group, a nitro group, an allyl group, a phenyl group, a naphthyl group, or a halogen atom.
- n11 and n12 each independently represent an integer of 0 to 4. When there are two or more R 11 s , the two or more R 11 s may be the same or different. When R 12 is two or more, the two or more R 12 may be the same or different.
- Z 1 in the formula (1-1) is, for example, preferably an alkylene group having 1 to 6 carbon atoms which may be substituted with a halogen atom, or a sulfonyl group.
- R 1 and R 2 each independently represent an alkyl group having 1 to 6 carbon atoms which may be substituted with a halogen atom, or a halogen atom.
- m1 and m2 each independently represent an integer of 0 to 4. When there are two or more R 1s , the two or more R 1s may be the same or different. When R2 is two or more, the two or more R2 may be the same or different.
- X11 represents a divalent group represented by any one of the following formulas (1-2-1) to (1-2-3).
- Z11 and Z12 each independently represent a single bond or a divalent group represented by the following formula (1-2-4).
- R 1 to R 5 each independently represent a hydrogen atom, an alkyl group having 1 to 10 carbon atoms which may be interrupted by an oxygen atom or a sulfur atom, an alkenyl group having 2 to 10 carbon atoms which may be interrupted by an oxygen atom or a sulfur atom, an alkynyl group having 2 to 10 carbon atoms which may be interrupted by an oxygen atom or a sulfur atom, a benzyl group, or a phenyl group, and the phenyl group may be substituted with at least one monovalent group selected from the group consisting of an alkyl group having 1 to 6 carbon atoms, a halogen atom, an alkoxy group having 1 to 6 carbon atoms, a nitro group, a cyano group, and an alkylthio group having 1 to 6 carbon atoms.
- R 1 and R 2 may be bonded to each other to form a ring having 3 to 6 carbon atoms.
- R 3 and R 4 may be bonded to each other to form a ring having 3 to 6 carbon atoms.
- * represents a bond.
- *1 represents a bond bonded to a carbon atom in formula (1-2).
- *2 represents a bond bonded to a nitrogen atom in formula (1-2).
- m1 is an integer of 0 to 4
- m2 is 0 or 1
- m3 is 0 or 1
- m4 is an integer of 0 to 2.
- *3 represents a bond bonded to the nitrogen atom in formula (1-2).
- *4 represents a bond.
- examples of a halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- the alkyl group is not limited to being linear, but may be branched or cyclic.
- linear or branched alkyl groups include a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, and an n-hexyl group.
- Examples of cyclic alkyl groups (cycloalkyl groups) include a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group.
- examples of an alkoxy group include a methoxy group, an ethoxy group, an n-pentyloxy group, and an isopropoxy group.
- examples of the alkylthio group include a methylthio group, an ethylthio group, an n-pentylthio group, an isopropylthio group and the like.
- examples of the alkenyl group include an ethenyl group, a 1-propenyl group, a 2-propenyl group, a 1-methyl-1-ethenyl group, a 1-butenyl group, a 2-butenyl group, a 3-butenyl group, a 2-methyl-1-propenyl group, and a 2-methyl-2-propenyl group.
- examples of the alkynyl group include the above-mentioned "alkenyl groups" in which the double bond is replaced with a triple bond.
- examples of the alkenyloxy group include a vinyloxy group, a 1-propenyloxy group, a 2-n-propenyloxy group (allyloxy group), a 1-n-butenyloxy group, and a prenyloxy group.
- examples of the alkynyloxy group include a 2-propynyloxy group, a 1-methyl-2-propynyloxy group, a 2-methyl-2-propynyloxy group, a 2-butynyloxy group, and a 3-butynyloxy group.
- examples of the acyl group include an acetyl group and a propionyl group.
- examples of the aryloxy group include a phenoxy group, naphthyloxy group, and the like.
- examples of the arylcarbonyl group include a phenylcarbonyl group.
- examples of the aralkyl group include a benzyl group and a phenethyl group.
- examples of the alkylene group include a methylene group, an ethylene group, a 1,3-propylene group, a 2,2-propylene group, a 1-methylethylene group, a 1,4-butylene group, a 1-ethylethylene group, a 1-methylpropylene group, a 2-methylpropylene group, a 1,5-pentylene group, a 1-methylbutylene group, a 2-methylbutylene group, a 1,1-dimethylpropylene group, a 1,2-dimethylpropylene group, a 1-ethylpropylene group, a 2-ethylpropylene group, a 1,6-hexylene group, a 1,4-cyclohexylene group, a 1,8-octylene group, a 2-ethyloctylene group, a 1,9-nonylene group, and a 1,10-decylene group.
- Examples of the alkyl group having 1 to 10 carbon atoms which may be interrupted by an oxygen atom or a sulfur atom in R 1 to R 5 of formulas (1-2-1) to (1-2-3) include an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkoxyalkyl group having 2 to 10 carbon atoms, an alkoxyalkoxyalkyl group having 3 to 10 carbon atoms, an alkylthio group having 1 to 10 carbon atoms, and an alkylthioalkyl group having 2 to 10 carbon atoms.
- the alkyl group having 1 to 10 carbon atoms which may be interrupted by an oxygen atom or a sulfur atom may contain two or more oxygen atoms or sulfur atoms.
- Examples of the structure represented by the following formula in formula (1-1) include the following structures. (* represents a bond.) (* represents a bond.)
- Examples of the structure represented by the following formula in formula (1-2) include the following structures. (* represents a bond.) (* represents a bond.)
- the polymer (A) may have a structure represented by the following formula (E):
- the structure represented by formula (E) is located, for example, at an end (one end or both ends) of the polymer (A).
- Y represents a monovalent group.
- n11 represents 0 or 1. * represents a bond.
- Examples of the monovalent group for Y in formula (E) include monovalent organic groups having 1 to 30 carbon atoms.
- Examples of Y in formula (E) include a monovalent residue in which one hydrogen atom has been removed from an aliphatic ring which may be substituted with a substituent, and a monovalent aromatic group which may be substituted with a substituent.
- Examples of the substituent include a halogen atom, a hydroxyl group, an alkyl group having 1 to 6 carbon atoms, and an alkoxy group having 1 to 6 carbon atoms.
- Examples of the aromatic group in the monovalent aromatic group which may be substituted with a substituent include aromatic hydrocarbon groups, such as a phenyl group, a naphthyl group, and an anthracenyl group.
- Examples of the compound represented by formula (EA) include the following compounds.
- the polymer (A) may have, at its terminal, a "non-cyclic aliphatic hydrocarbon group which may be interrupted by a group containing a heteroatom and which may be substituted with a substituent."
- the non-cyclic aliphatic hydrocarbon group refers to a linear or branched alkyl group, a linear or branched alkenyl group, a linear or branched alkynyl group, or any combination thereof.
- the number of carbon atoms in the non-cyclic aliphatic hydrocarbon group is preferably less than 12, more preferably less than 10.
- the alkyl group includes methyl, ethyl, n-propyl, i-propyl, cyclopropyl, n-butyl, i-butyl, s-butyl, t-butyl, cyclobutyl, 1-methylcyclopropyl, 2-methylcyclopropyl, n-pentyl, 1-methyln-butyl, 2-methyln-butyl, 3-methyln-butyl, 1,1-dimethyln-propyl, 1,2-dimethyln-propyl, 2,2-dimethyln-propyl, 1-ethyln-propyl, cyclopentyl, 1-methylcyclobutyl, 2-methylcyclobutyl, 3-methylcyclobutyl, 1, 2-dimethyl-cyclopropyl group, 2,3-dimethyl-cyclopropyl group, 1-ethyl-cyclopropyl group, 2-ethyl-cyclopropyl group, n-hexy
- Alkenyl groups include 1-propenyl, 2-propenyl, 1-methyl-1-ethenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-methyl-1-propenyl, 2-methyl-2-propenyl, 1-ethylethenyl, 1-methyl-1-propenyl, 1-methyl-2-propenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-n-propylethenyl, 1-methyl-1-but ...-2-propenyl, 1-ethyl-1-propenyl, 1-methyl-2-propenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-n-propyl-2-ethenyl, 1-methyl-1-butenyl, 2-methyl-2-propenyl, 1-ethyl-2-propenyl, 1-ethyl-1-propenyl, 1-methyl-2-propenyl, 1-ethyl
- Alkynyl groups include ethynyl groups, 1-propynyl groups, and 2-propynyl groups.
- the heteroatom is not particularly limited, but is usually an oxygen atom, a sulfur atom, or a nitrogen atom.
- groups containing heteroatoms include ether groups, thioether groups, carbonyl groups, thiocarbonyl groups, ester groups, thioester groups, thionoester groups, amide groups, urea groups, and oxysulfonyl groups.
- the phrase "may be interrupted by a group containing a heteroatom” means that the non-cyclic aliphatic hydrocarbon group according to the present invention may contain one or more ether bonds, thioether bonds, carbonyl bonds, thiocarbonyl bonds, ester bonds, thioester bonds, thionoester bonds, amide bonds, urea bonds, oxysulfonyl bonds, etc. between its carbon-carbon bonds.
- the type of bond may be one or two or more.
- May be substituted with a substituent means that all or part of the hydrogen atoms of the non-cyclic aliphatic hydrocarbon group according to the present invention may be substituted with, for example, a hydroxy group, a linear or branched alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an acyloxy group having 1 to 10 carbon atoms, or a carboxy group.
- the alkyl group is as described above.
- the alkoxy groups are methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy, t-butoxy, n-pentyloxy, 1-methyl-n-butoxy, 2-methyl-n-butoxy, 3-methyl-n-butoxy, 1,1-dimethyl-n-propoxy, 1,2-dimethyl-n-propoxy, 2,2-dimethyl-n-propoxy, 1-ethyl-n-propoxy, n-hexyloxy, 1-methyl-n-pentyloxy, 2-methyl-n-pentyloxy, 3-methyl-n-pentyloxy, 4-methyl-n-pentyloxy, 1,1-dimethyl-n-butoxy, 1,2-dimethyl
- the aryloxy group include -n-butoxy group, 1,3-dimethyl-n-butoxy group, 2,2-dimethyl-n-butoxy group, 2,3-dimethyl-n-butoxy group,
- the acyloxy group is represented by the following formula (20).
- Z represents a hydrogen atom or an alkyl group having 1 to 9 carbon atoms among the above alkyl groups, and * represents a bonding portion to the above non-cyclic aliphatic hydrocarbon group.
- a non-cyclic aliphatic hydrocarbon group containing a heteroatom and having less than 12 carbon atoms is preferred, a non-cyclic aliphatic hydrocarbon group containing an oxygen atom and having less than 12 carbon atoms is more preferred, a non-cyclic aliphatic hydrocarbon group containing less than 12 carbon atoms and interrupted by at least two groups selected from the group consisting of an ether group, a carbonyl group, and an ester group is even more preferred, and a non-cyclic aliphatic hydrocarbon group containing less than 12 carbon atoms and interrupted by an ether group or an ester group is most preferred.
- the non-cyclic aliphatic hydrocarbon group preferably has at least one unsaturated bond (e.g., a double bond or a triple bond).
- the non-cyclic aliphatic hydrocarbon group preferably has 1 to 3 unsaturated bonds.
- the unsaturated bond is preferably a double bond.
- non-cyclic aliphatic hydrocarbon group which may be interrupted by a group containing a heteroatom and which may be substituted by a substituent
- a saturated or unsaturated dicarboxylic acid anhydride such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, methylmaleic acid, ethylmaleic acid, dimethylmaleic acid, or citraconic acid with the terminal of the polymer by a method known per se.
- the polymer (A) can be obtained, for example, by the following reaction (I) or (II).
- R 1 , R 2 , m1 and m2 have the same meanings as R 1 , R 2 , m1 and m2 in formula (1), respectively.
- Q 1 , n1 and n2 have the same meanings as Q 1 , n1 and n2 in formula (1-1), respectively.
- X 11 , Z 11 and Z 12 have the same meanings as X 11 , Z 11 and Z 12 in formula (1-2), respectively.
- Reactions (I) and (II) may be carried out, for example, in the presence of a catalyst.
- the catalyst is, for example, a quaternary phosphonium salt such as tetrabutylphosphonium bromide or ethyltriphenylphosphonium bromide, or a quaternary ammonium salt such as benzyltriethylammonium chloride.
- the amount of catalyst used may be selected appropriately from the range of 0.1 to 10% by mass based on the total mass of the reaction raw materials used in the reaction.
- the optimum reaction temperature and time may be selected, for example, from the ranges of 80 to 160°C and 2 to 50 hours.
- the molecular weight of the polymer (A) is not particularly limited.
- the lower limit of the weight average molecular weight of the polymer (A) is, for example, 500, 1,000, 2,000, or 3,000.
- the upper limit of the weight average molecular weight of the polymer (A) is, for example, 100,000, 50,000, or 30,000.
- the content of the polymer (A) in the composition for forming a resist underlayer film is not particularly limited, but is preferably 30% by mass to 95% by mass, more preferably 50% by mass to 90% by mass, and particularly preferably 60% by mass to 85% by mass, based on the film-constituting components in the composition for forming a resist underlayer film.
- the film constituent components refer to the components other than the solvent in the composition for forming a resist underlayer film.
- the solvent used in the composition for forming the resist underlayer film is not particularly limited as long as it can uniformly dissolve the components contained therein such as the polymer (A), but is preferably an organic solvent generally used in chemicals for semiconductor lithography processes.
- 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 monomethyl ether, propylene glycol monoethyl ether, propylene glycol monomethyl ether acetate, propylene glycol propyl ether acetate, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, cyclohexane ...
- Examples of the solvent include heptanone, 4-methyl-2-pentanol, methyl 2-hydroxyisobutyrate, ethyl 2-hydroxyisobutyrate, ethyl ethoxyacetate, 2-hydroxyethyl acetate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, ethyl 3-ethoxypropionate, methyl 3-ethoxypropionate, methyl pyruvate, ethyl pyruvate, ethyl acetate, butyl acetate, ethyl lactate, butyl lactate, 2-heptanone, methoxycyclopentane, anisole, ⁇ -butyrolactone, N-methylpyrrolidone, N,N-dimethylformamide, and N,N-dimethylacetamide. These solvents can be used alone or in combination of two or more.
- propylene glycol monomethyl ether propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, and cyclohexanone are preferred.
- Propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate are particularly preferred.
- the composition for forming a resist underlayer film may contain a crosslinking agent.
- the crosslinking agent is not particularly limited.
- the crosslinking agent may, for example, be a compound having two or more structures represented by the following formula (C).
- R 101 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxyalkyl group having 2 to 6 carbon atoms. * represents a bond.
- the bond is, for example, bonded to a nitrogen atom or a carbon atom constituting an aromatic hydrocarbon ring.
- R 101 is preferably a hydrogen atom, a methyl group, an ethyl group or a group represented by the following structure.
- R 102 represents a hydrogen atom, a methyl group, or an ethyl group. * represents a bond.
- Preferred crosslinking agents are melamine compounds, guanamine compounds, glycoluril compounds, urea compounds, and compounds having a phenolic hydroxyl group. These can be used alone or in combination of two or more.
- the melamine compound is not particularly limited as long as it has a group capable of reacting with a hydroxy group.
- the melamine compound include hexamethylol melamine, hexamethoxymethyl melamine, a compound in which 1 to 6 methylol groups of hexamethylol melamine are methoxymethylated or a mixture thereof, hexamethoxyethyl melamine, hexaacyloxymethyl melamine, a compound in which 1 to 6 methylol groups of hexamethylol melamine are acyloxymethylated or a mixture thereof, and the like.
- the guanamine compound is not particularly limited as long as it has a group capable of reacting with a hydroxy group.
- examples of the guanamine compound include tetramethylol guanamine, tetramethoxymethyl guanamine, a compound in which one to four methylol groups of tetramethylol guanamine are methoxymethylated or a mixture thereof, tetramethoxyethyl guanamine, tetraacyloxyguanamine, a compound in which one to four methylol groups of tetramethylol guanamine are acyloxymethylated or a mixture thereof, and the like.
- glycoluril compound is not particularly limited as long as it has a group capable of reacting with a hydroxy group.
- glycoluril compounds include tetramethylol glycoluril, tetramethoxy glycoluril, tetramethoxymethyl glycoluril, compounds in which one to four methylol groups of tetramethylol glycoluril are methoxymethylated or mixtures thereof, and compounds in which one to four methylol groups of tetramethylol glycoluril are acyloxymethylated or mixtures thereof.
- the glycoluril compound may be, for example, a glycoluril derivative represented by the following formula (1E).
- the four R 1s each independently represent a methyl group or an ethyl group
- R 2 and R 3 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group.
- glycoluril derivative represented by formula (1E) examples include compounds represented by the following formulas (1E-1) to (1E-6).
- the glycoluril derivative represented by formula (1E) can be obtained, for example, by reacting a glycoluril derivative represented by the following formula (2E) with at least one compound represented by the following formula (3d).
- R2 and R3 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a phenyl group, and R4 each independently represent an alkyl group having 1 to 4 carbon atoms.
- R 1 represents a methyl group or an ethyl group.
- glycoluril derivative represented by formula (2E) examples include compounds represented by the following formulae (2E-1) to (2E-4).
- Examples of the compound represented by formula (3d) include compounds represented by the following formulae (3d-1) and (3d-2).
- the urea compound is not particularly limited as long as it has a group capable of reacting with a hydroxy group.
- examples of the urea compound include tetramethylol urea, tetramethoxymethyl urea, tetramethylol urea compounds in which one to four methylol groups are methoxymethylated, or mixtures thereof, and tetramethoxyethyl urea.
- Examples of the compound having a phenolic hydroxy group include compounds represented by the following formula (111) or (112).
- Q2 represents a single bond or an m2-valent organic group.
- R 8 , R 9 , R 11 and R 12 each represent a hydrogen atom or a methyl group.
- R7 and R10 each represent an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 40 carbon atoms.
- n9 is an integer satisfying 1 ⁇ n9 ⁇ 3, n10 is an integer satisfying 2 ⁇ n10 ⁇ 5, n11 is an integer satisfying 0 ⁇ n11 ⁇ 3, n12 is an integer satisfying 0 ⁇ n12 ⁇ 3, and 3 ⁇ ( n9 + n10 + n11 + n12 ) ⁇ 6.
- n13 is an integer satisfying 1 ⁇ n13 ⁇ 3, n14 is an integer satisfying 1 ⁇ n14 ⁇ 4, n15 is an integer satisfying 0 ⁇ n15 ⁇ 3, n16 is an integer satisfying 0 ⁇ n16 ⁇ 3, and 2 ⁇ ( n13 + n14 + n15 + n16 ) ⁇ 5.
- m2 represents an integer from 2 to 10.
- the m2-valent organic group for Q2 includes, for example, an m2-valent organic group having 1 to 4 carbon atoms.
- Examples of the compound represented by formula (111) or formula (112) include the following compounds.
- the above compound is available as a product of Asahi Yukizai Kogyo Co., Ltd. and Honshu Chemical Industry Co., Ltd.
- An example of the product is TMOM-BP, a product name of Asahi Yukizai Kogyo Co., Ltd.
- glycoluril compounds are preferred, specifically tetramethylol glycoluril, tetramethoxy glycoluril, tetramethoxymethyl glycoluril, a compound in which one to four methylol groups of tetramethylol glycoluril are methoxymethylated or a mixture thereof, and a compound in which one to four methylol groups of tetramethylol glycoluril are acyloxymethylated or a mixture thereof, with tetramethoxymethyl glycoluril being preferred.
- the molecular weight of the crosslinking agent is not particularly limited, but is preferably 500 or less.
- the content of the crosslinking agent in the composition for forming the resist underlayer film is not particularly limited, but is, for example, 1% by mass to 50% by mass, and preferably 5% by mass to 40% by mass, relative to the polymer (A).
- the curing catalyst contained as an optional component in the composition for forming a resist underlayer film may be either a thermal acid generator or a photoacid generator, but it is preferable to use a thermal acid generator.
- the thermal acid generator include sulfonic acid compounds and carboxylic acid compounds such as p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonate (pyridinium p-toluenesulfonic acid), pyridinium phenolsulfonic acid, pyridinium p-hydroxybenzenesulfonic acid (pyridinium p-phenolsulfonate salt), pyridinium trifluoromethanesulfonic acid, salicylic acid, camphorsulfonic acid, 5-sulfosalicylic acid, 4-chlorobenzenesulfonic acid, 4-hydroxybenzenesulfonic acid, benzened
- photoacid generators examples include onium salt compounds, sulfonimide compounds, and disulfonyldiazomethane compounds.
- onium salt compounds include iodonium salt compounds such as diphenyliodonium hexafluorophosphate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium nonafluoronormal butanesulfonate, diphenyliodonium perfluoronormal octanesulfonate, diphenyliodonium camphorsulfonate, bis(4-tert-butylphenyl)iodonium camphorsulfonate, and bis(4-tert-butylphenyl)iodonium trifluoromethanesulfonate, and sulfonium salt compounds such as triphenylsulfonium hexafluoroantimonate, triphenylsulfonium nonafluoronormal butanesulfonate, triphenylsulfonium camphorsulfonate, and triphenylsulfonium triflu
- sulfonimide compounds include N-(trifluoromethanesulfonyloxy)succinimide, N-(nonafluoronormalbutanesulfonyloxy)succinimide, N-(camphorsulfonyloxy)succinimide, and N-(trifluoromethanesulfonyloxy)naphthalimide.
- disulfonyldiazomethane compounds include bis(trifluoromethylsulfonyl)diazomethane, bis(cyclohexylsulfonyl)diazomethane, bis(phenylsulfonyl)diazomethane, bis(p-toluenesulfonyl)diazomethane, bis(2,4-dimethylbenzenesulfonyl)diazomethane, and methylsulfonyl-p-toluenesulfonyldiazomethane.
- the content of the curing catalyst relative to the crosslinking agent is, for example, 0.1% by mass to 50% by mass, and preferably 1% by mass to 30% by mass.
- a surfactant may be further added to the composition for forming a resist underlayer film in order to prevent pinholes, striations, and the like, and to further improve the coatability against surface unevenness.
- surfactant examples include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, and polyoxyethylene oleyl ether; polyoxyethylene alkylaryl ethers such as polyoxyethylene octylphenol ether and polyoxyethylene nonylphenol ether; polyoxyethylene-polyoxypropylene block copolymers; sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, and sorbitan tristearate; polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan tristearate, and the like; nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters, such as polyoxyethylene sorbitan
- the amount of these surfactants to be added is usually 2.0% by mass or less, and preferably 1.0% by mass or less, based on the total solid content of the composition for forming a resist underlayer film.
- These surfactants may be added alone or in combination of two or more kinds.
- the solid content of the composition for forming a resist underlayer film of the present invention i.e., the components excluding the solvent, is, for example, 0.01% by mass to 10% by mass.
- the resist underlayer of the present invention is a cured product of the above-mentioned composition for forming a resist underlayer film.
- the resist underlayer film can be produced, for example, by applying the above-mentioned composition for forming a resist underlayer film onto a semiconductor substrate and baking the applied composition.
- Semiconductor substrates onto which the resist underlayer film forming composition is applied include, for example, 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), CVD (chemical vapor deposition), reactive sputtering, ion plating, vacuum deposition, or spin coating (spin-on glass: SOG).
- ALD atomic layer deposition
- CVD chemical vapor deposition
- reactive sputtering ion plating
- vacuum deposition vacuum deposition
- spin coating spin-on glass: SOG.
- the inorganic film include polysilicon film, silicon oxide film, silicon nitride film, BPSG (Boro-Phospho Silicate Glass) film, titanium nitride film, titanium nitride oxide film, tungsten film, gallium nitride film, and gallium arsenide film.
- the resist underlayer film forming composition of the present invention is applied onto such a semiconductor substrate by a suitable application method such as a spinner or coater.
- the resist underlayer film is then formed by baking using a 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 thickness of the resist underlayer film may be, for example, 0.001 ⁇ m (1 nm) to 10 ⁇ m, 0.002 ⁇ m (2 nm) to 1 ⁇ m, 0.005 ⁇ m (5 nm) to 0.5 ⁇ m (500 nm), 0.001 ⁇ m (1 nm) to 0.05 ⁇ m (50 nm), 0.002 ⁇ m (2 nm) to 0.05 ⁇ m (50 nm), 0.003 ⁇ m (3 nm) to 0.05 ⁇ m (50 nm), 0.004 ⁇ m (4 nm) to 0.05 ⁇ m (50 nm), 0.005 ⁇ m (5 nm) to 0.05 ⁇ m (5 0 nm), 0.003 ⁇ m (3 nm) to 0.03 ⁇ m (30 nm), 0.003 ⁇ m (3 nm) to 0.02 ⁇ m (20 nm), 0.005 ⁇ m (5 nm) to 0.02 ⁇ m (20 nm),
- the method for measuring the film thickness of the resist underlayer film is as follows.
- the laminate of the present invention comprises a semiconductor substrate and the resist underlayer film of the present invention.
- the semiconductor substrate may be, for example, the semiconductor substrate described above.
- the resist underlayer film is disposed, for example, on a semiconductor substrate.
- the method for manufacturing a semiconductor device of the present invention includes at least the following steps. - forming a resist underlayer film on a semiconductor substrate using the composition for forming a resist underlayer film of the present invention; and - forming a resist film on the resist underlayer film.
- the pattern forming method of the present invention includes at least the following steps.
- a step of etching the resist underlayer film using the resist pattern as a mask includes at least the following steps.
- a resist film is formed on the resist underlayer film.
- the thickness of the resist film is preferably 200 nm or less, more preferably 150 nm or less, even more preferably 100 nm or less, and particularly preferably 80 nm or less.
- the thickness of the resist film is preferably 10 nm or more, more preferably 20 nm or more, and particularly preferably 30 nm or more.
- the resist film formed on the resist underlayer film by a known method is not particularly limited as long as it responds to EB or EUV used for irradiation. Either a negative photoresist or a positive photoresist can be used. In this specification, a resist that responds to EB is also called a photoresist.
- photoresists include positive photoresists made of novolac resin and 1,2-naphthoquinone diazide sulfonic acid ester, chemically amplified photoresists made of a binder having a group that decomposes with acid to increase the alkaline dissolution rate and a photoacid generator, chemically amplified photoresists made of a low molecular compound that decomposes with acid to increase the alkaline dissolution rate of the photoresist, an alkali-soluble binder, and a photoacid generator, chemically amplified photoresists made of a binder having a group that decomposes with acid to increase the alkaline dissolution rate of the photoresist, a low molecular compound that decomposes with acid to increase the alkaline dissolution rate of the photoresist, and a photoacid generator, and resists containing metal elements.
- V146G (trade name) manufactured by JSR Corporation, APEX-E (trade name) manufactured by Shipley, PAR710 (trade name) manufactured by Sumitomo Chemical Co., Ltd., and AR2772 and SEPR430 (trade names) manufactured by Shin-Etsu Chemical Co., Ltd. may be mentioned.
- resist compositions include the following compositions:
- An actinic ray-sensitive or radiation-sensitive resin composition comprising: resin A having a repeating unit having an acid-decomposable group in which a polar group is protected with a protecting group that is cleaved by the action of an acid; and a compound represented by the following general formula (121).
- m represents an integer of 1 to 6.
- R 1 and R 2 each independently represent a fluorine atom or a perfluoroalkyl group.
- L 1 represents —O—, —S—, —COO—, —SO 2 — or —SO 3 —.
- L2 represents an alkylene group which may have a substituent or a single bond.
- W1 represents a cyclic organic group which may have a substituent.
- M + represents a cation.
- a metal-containing film-forming composition for extreme ultraviolet or electron beam lithography comprising a compound having a metal-oxygen covalent bond and a solvent, the metal element constituting the compound belonging to Periods 3 to 7 of Groups 3 to 15 of the periodic table.
- a radiation-sensitive resin composition comprising a polymer having a first structural unit represented by the following formula (31) and a second structural unit represented by the following formula (32) containing an acid-dissociable group, and an acid generator.
- Ar is a group obtained by removing (n+1) hydrogen atoms from an arene having 6 to 20 carbon atoms.
- R 1 is a hydroxy group, a sulfanyl group, or a monovalent organic group having 1 to 20 carbon atoms.
- n is an integer from 0 to 11. When n is 2 or more, multiple R 1s are the same or different.
- R 2 is a hydrogen atom, a fluorine atom, a methyl group, or a trifluoromethyl group.
- R 3 is a monovalent group having 1 to 20 carbon atoms containing the above-mentioned acid dissociable group.
- Z is a single bond, an oxygen atom, or a sulfur atom.
- R 4 is a hydrogen atom, a fluorine atom, a methyl group, or a trifluoromethyl group.
- R 2 represents an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, a hydrogen atom or a halogen atom
- X 1 represents a single bond, -CO-O-* or -CO-NR 4 -*
- * represents a bond to -Ar
- R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
- Ar represents an aromatic hydrocarbon group having 6 to 20 carbon atoms which may have one or more groups selected from the group consisting of a hydroxyl group and a carboxyl group.
- resist films examples include:
- a resist film comprising a base resin containing a repeating unit represented by the following formula (a1) and/or a repeating unit represented by the following formula (a2) and a repeating unit that generates an acid bonded to the polymer main chain upon exposure.
- R A is each independently a hydrogen atom or a methyl group.
- R 1 and R 2 are each independently a tertiary alkyl group having 4 to 6 carbon atoms.
- R 3 is each independently a fluorine atom or a methyl group.
- m is an integer of 0 to 4.
- X 1 is a single bond, a phenylene group or a naphthylene group, or a linking group having 1 to 12 carbon atoms containing at least one selected from an ester bond, a lactone ring, a phenylene group, and a naphthylene group.
- X 2 is a single bond, an ester bond, or an amide bond.
- resist materials examples include:
- R A is a hydrogen atom or a methyl group.
- X 1 is a single bond or an ester group.
- X 2 is a linear, branched or cyclic alkylene group having 1 to 12 carbon atoms or an arylene group having 6 to 10 carbon atoms, a part of the methylene groups constituting the alkylene group may be substituted with an ether group, an ester group or a lactone ring-containing group, and at least one hydrogen atom contained in X 2 is substituted with a bromine atom.
- X 3 is a single bond, an ether group, an ester group, or a linear, branched or cyclic alkylene group having 1 to 12 carbon atoms, a part of the methylene groups constituting the alkylene group may be substituted with an ether group or an ester group.
- Rf 1 to Rf 4 are each independently a hydrogen atom, a fluorine atom or a trifluoromethyl group, and at least one of them is a fluorine atom or a trifluoromethyl group.
- Rf 1 and Rf 2 may combine to form a carbonyl group.
- R 1 R 1 to R 5 are each independently a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms, a linear, branched or cyclic alkenyl group having 2 to 12 carbon atoms, an alkynyl group having 2 to 12 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or an aryloxyalkyl group having 7 to 12 carbon atoms, some or all of the hydrogen atoms of these groups may be substituted with a hydroxy group, a carboxy group, a halogen atom, an oxo group, a cyano group, an amide group, a nitro group, a sultone group, a sulfone group, or a sulfonium salt-containing group, and some of the methylene groups constituting these groups may be substituted with an ether group, an ester group, a carbonyl group, a carbon
- a resist material comprising a base resin containing a polymer containing a repeating unit represented by the following formula (a):
- R A is a hydrogen atom or a methyl group.
- R 1 is a hydrogen atom or an acid labile group.
- R 2 is a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, or a halogen atom other than bromine.
- X 1 is a single bond, a phenylene group, or a linear, branched or cyclic alkylene group having 1 to 12 carbon atoms which may contain an ester group or a lactone ring.
- X 2 is -O-, -O-CH 2 - or -NH-.
- m is an integer of 1 to 4.
- u is an integer of 0 to 3, with the proviso that m+u is an integer of 1 to 4.
- a resist composition which generates an acid upon exposure and changes its solubility in a developer by the action of the acid
- the composition contains a base component (A) whose solubility in a developer changes under the action of an acid, and a fluorine additive component (F) that is decomposable in an alkaline developer
- the fluorine additive component (F) is a resist composition containing a fluorine resin component (F1) having a structural unit (f1) containing a base dissociable group, and a structural unit (f2) containing a group represented by the following general formula (f2-r-1):
- Rf 21 each independently represents a hydrogen atom, an alkyl group, an alkoxy group, a hydroxy group, a hydroxyalkyl group, or a cyano group.
- n′′ is an integer of 0 to 2. * represents a bond.
- the structural unit (f1) includes a structural unit represented by the following general formula (f1-1) or a structural unit represented by the following general formula (f1-2).
- R is each independently a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a halogenated alkyl group having 1 to 5 carbon atoms.
- X is a divalent linking group having no acid dissociable site.
- a aryl is a divalent aromatic cyclic group which may have a substituent.
- X 01 is a single bond or a divalent linking group.
- R 2 is each independently an organic group having a fluorine atom.
- coatings examples include the following:
- a coating comprising a metal oxo-hydroxo network with organic ligands via metal carbon bonds and/or metal carboxylate bonds.
- RzSnO (2-(z/2)-(x/2)) (OH) x , where 0 ⁇ z ⁇ 2 and 0 ⁇ (
- a coating solution comprising an organic solvent and a first organometallic compound having the formula RSnO (3/2-x/2) (OH) x , where 0 ⁇ x ⁇ 3, wherein the solution contains from about 0.0025M to about 1.5M tin, and R is an alkyl or cycloalkyl group having 3 to 31 carbon atoms, the alkyl or cycloalkyl group being bonded to the tin at a secondary or tertiary carbon atom.
- An aqueous inorganic pattern forming precursor solution comprising water, a mixture of metal suboxide cations, polyatomic inorganic anions, and a radiation sensitive ligand comprising a peroxide group.
- the EB or EUV irradiation is carried out, for example, through a mask (reticle) for forming a predetermined pattern.
- the composition for forming a resist underlayer film of the present invention is preferably applied for EUV (extreme ultraviolet) exposure.
- EUV extreme ultraviolet
- the irradiation energy of the electron beam and the exposure dose of EUV are not particularly limited.
- baking Post Exposure Bake
- the baking temperature is not particularly limited, but is preferably from 60°C to 150°C, more preferably from 70°C to 120°C, and particularly preferably from 75°C to 110°C.
- the baking time is not particularly limited, but is preferably from 1 second to 10 minutes, more preferably from 10 seconds to 5 minutes, and particularly preferably from 30 seconds to 3 minutes.
- an alkaline developer is used.
- the development temperature is, for example, from 5°C to 50°C.
- the development time may be, for example, from 10 seconds to 300 seconds.
- alkaline developer for example, aqueous solutions of alkalis such as inorganic alkalis such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, and ammonia water, primary amines such as ethylamine and n-propylamine, secondary amines such as diethylamine and di-n-butylamine, tertiary amines such as triethylamine and methyldiethylamine, alcohol amines such as dimethylethanolamine and triethanolamine, quaternary ammonium salts such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, and choline, and cyclic amines such as pyrrole and piperidine can be used.
- alkalis
- an appropriate amount of alcohols such as isopropyl alcohol and a nonionic surfactant can be added to the aqueous solution of the above-mentioned alkalis.
- preferred developers are aqueous solutions of quaternary ammonium salts, more preferably aqueous solutions of tetramethylammonium hydroxide and aqueous solutions of choline.
- surfactants and the like can be added to these developers.
- a method can also be used in which development is performed with an organic solvent such as butyl acetate instead of an alkaline developer to develop the parts of the photoresist where the alkaline dissolution rate is not improved.
- the resist underlayer film is etched using the formed resist pattern as a mask.
- the etching may be dry etching or wet etching, but is preferably dry etching.
- the inorganic film is formed on the surface of the semiconductor substrate used, the surface of the inorganic film is exposed, and when the inorganic film is not formed on the surface of the semiconductor substrate used, the surface of the semiconductor substrate is exposed.
- the semiconductor substrate is then processed by a known method (e.g., dry etching) to produce a semiconductor element.
- the weight average molecular weights of the polymers shown in the following Synthesis Examples 1 to 3 and Comparative Synthesis Examples 1 and 2 in this specification are the results of measurement by gel permeation chromatography (hereinafter abbreviated as GPC).
- GPC gel permeation chromatography
- a GPC device manufactured by Tosoh Corporation was used, and the measurement conditions etc. are as follows.
- Standard sample polystyrene (manufactured by Tosoh Corporation)
- the structure present in polymer 2 is shown in the following formula.
- polymer 3 After replacing the atmosphere in the reaction vessel with nitrogen, the mixture was reacted at 120°C for 24 hours to obtain a polymer solution.
- the obtained polymer 3 had a weight average molecular weight of 5600 and a dispersity of 2.3 in terms of standard polystyrene.
- the structure present in polymer 3 is shown in the following formula.
- Comparative Synthesis Example 1 5.00 g of monoallyl diglycidyl isocyanuric acid (manufactured by Shikoku Chemical Industry Co., Ltd.), 5.75 g of bis(3,5-dimethyl-4-hydroxyphenyl)sulfone (manufactured by Tokyo Chemical Industry Co., Ltd.), 0.16 g of 2,6-di-tert-butyl-p-cresol (manufactured by Tokyo Chemical Industry Co., Ltd.), and 0.46 g of tetrabutylphosphonium bromide (manufactured by Hokko Chemical Industry Co., Ltd.) were added to 45.45 g of cyclohexanone and dissolved.
- polymer 4 After replacing the reaction vessel with nitrogen, the mixture was reacted at 120° C. for 24 hours to obtain a polymer solution.
- the obtained polymer 4 had a weight average molecular weight of 16200 and a dispersity of 2.9 in terms of standard polystyrene.
- the structure present in polymer 4 is shown in the following formula.
- Comparative Synthesis Example 2 9.00 g of monoallyl diglycidyl isocyanuric acid (manufactured by Shikoku Chemical Industry Co., Ltd.), 11.36 g of 2,2-bis(4-hydroxyphenyl)hexafluoropropane (manufactured by Tokyo Chemical Industry Co., Ltd.), 0.28 g of 2,6-di-tert-butyl-p-cresol (manufactured by Tokyo Chemical Industry Co., Ltd.), and 1.09 g of tetrabutylphosphonium bromide (manufactured by Hokko Chemical Industry Co., Ltd.) were added to 26.56 g of propylene glycol monomethyl ether and dissolved.
- polymer 5 After replacing the reaction vessel with nitrogen, the mixture was reacted at 120° C. for 24 hours to obtain a polymer solution.
- the obtained polymer 5 had a weight average molecular weight of 17,500 and a dispersity of 2.4 in terms of standard polystyrene.
- the structure present in polymer 5 is shown in the following formula.
- composition for forming resist underlayer film (Preparation of composition for forming resist underlayer film)
- the polymers, crosslinking agents, curing catalysts, surfactants, and solvents obtained in Synthesis Examples 1 and 2 and Comparative Synthesis Examples 1 and 2 were mixed in the ratios shown in Tables 1-1 and 1-2, and filtered through a 0.1 ⁇ m fluorine resin filter to prepare compositions for forming resist underlayer films.
- Tables 1-1 and 1-2 The meanings of the abbreviations in Tables 1-1 and 1-2 are as follows.
- PGME-PL Imidazolo[4,5-d]imidazole-2,5(1H,3H)-dione, tetrahydro-1,3,4,6-tetrakis[(2-methoxy-1-methylethoxy)methyl]-
- PyPSA pyridinium-p-hydroxybenzenesulfonic acid
- PGMEA propylene glycol monomethyl ether acetate
- the proportions of polymer added in Tables 1-1 and 1-2 indicate the amounts of polymer itself added, not the amounts of polymer solutions added.
- resist patterning evaluation [Test of forming resist patterns using an EUV exposure device]
- the resist underlayer film forming compositions of Examples 1-2 and Comparative Examples 1-2 were applied onto a silicon wafer using a spinner.
- the silicon wafer was baked on a hot plate at 205°C for 60 seconds to obtain a resist underlayer film with a thickness of 5 nm.
- a positive resist solution for EUV was spin-coated onto the resist underlayer film, and heated at 130°C for 60 seconds to form an EUV resist film.
- the resist film was exposed under predetermined conditions using an EUV exposure device (NXE3400B).
- the resist film was baked (PEB) at 100°C for 60 seconds, cooled to room temperature on a cooling plate, and paddle developed for 30 seconds using a 2.38% tetramethylammonium hydroxide aqueous solution (NMD-3) as a photoresist developer.
- a resist pattern with a hole size of 17 nm to 20 nm was formed.
- a scanning electron microscope (CG6300, manufactured by Hitachi High-Technologies Corporation) was used to measure the length of the resist pattern.
- the photoresist patterns thus obtained were evaluated for the possibility of forming 20 nm contact holes (C/H). Formation of 20 nm C/H patterns was confirmed in all cases of Examples 1-2 and Comparative Examples 1-2.
- Table 3 shows the irradiation energies (mJ/cm 2 ) when the EUV irradiation amount at which a 20 nm hole was formed was taken as the optimal irradiation energy and Comparative Examples 1 and 2 were taken as 1.00. Improvement in sensitivity was confirmed in Examples 1-2 compared to Comparative Examples 1-2.
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Abstract
Description
[1] EB又はEUVリソグラフィー用レジスト下層膜形成用組成物であって、
下記式(1)で表される構造を有するポリマーと、溶剤とを含有する、レジスト下層膜形成用組成物。
m1及びm2は、それぞれ独立して、0~4の整数を表す。
R1が2つ以上のとき、2つ以上のR1は同じであってもよいし、異なっていてもよい。
R2が2つ以上のとき、2つ以上のR2は同じであってもよいし、異なっていてもよい。
*は、結合手を表す。)
[2] 前記ポリマーが、前記式(1)で表される構造を有する繰り返し単位として、下記式(1-1)で表される繰り返し単位を有する、[1]に記載のレジスト下層膜形成用組成物。
m1及びm2は、それぞれ独立して、0~4の整数を表す。
R1が2つ以上のとき、2つ以上のR1は同じであってもよいし、異なっていてもよい。
R2が2つ以上のとき、2つ以上のR2は同じであってもよいし、異なっていてもよい。
Q1は、芳香族炭化水素環を有する2価の有機基を表す。
n1及びn2は、それぞれ独立して、0又は1を表す。)
[3] 前記Q1が、下記式(1-1-1)で表される、[2]に記載のレジスト下層膜形成用組成物。
R11及びR12は、それぞれ独立して、ハロゲン原子で置換されていてもよい炭素原子数1~13のアルキル基、ヒドロキシ基、メトキシ基、チオール基、アセチル基、ニトロ基、アリル基、フェニル基、ナフチル基、又はハロゲン原子を表す。
n11及びn12は、それぞれ独立して、0~4の整数を表す。
R11が2つ以上のとき、2つ以上のR11は、同じであってもよいし、異なっていてもよい。
R12が2つ以上のとき、2つ以上のR12は、同じであってもよいし、異なっていてもよい。)
[4] m1及びm2が1であり、R1及びR2がメチル基である、[1]から[3]のいずれかに記載のレジスト下層膜形成用組成物。
[5] 架橋剤を含有する、[1]から[4]のいずれかに記載のレジスト下層膜形成用組成物。
[6] 前記架橋剤が、下記式(C)で表される構造を2つ以上有する化合物である、[5]に記載のレジスト下層膜形成用組成物。
[7] [1]から[6]のいずれかに記載のレジスト下層膜形成用組成物の硬化物である、レジスト下層膜。
[8] 半導体基板と、
[7]に記載のレジスト下層膜と、
を備える積層体。
[9] 半導体基板の上に、[1]から[6]のいずれかに記載のレジスト下層膜形成用組成物を用いて、レジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜を形成する工程と、
を含む、半導体素子の製造方法。
[10] 半導体基板の上に、[1]から[6]のいずれかに記載のレジスト下層膜形成用組成物を用いて、レジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜を形成する工程と、
前記レジスト膜にEB又はEUVを照射し、次いで、前記レジスト膜を現像し、レジストパターンを得る工程と、
前記レジストパターンをマスクに用い、前記レジスト下層膜をエッチングする工程と、
を含む、パターン形成方法。
本発明のレジスト下層膜形成用組成物は、EB(電子線)又はEUV(極端紫外線)リソグラフィー用レジスト下層膜形成用組成物である。
レジスト下層膜形成用組成物は、ポリマー(A)と、溶剤とを含有する。
ポリマー(A)は、下記式(1)で表される構造を有する。
m1及びm2は、それぞれ独立して、0~4の整数を表す。
R1が2つ以上のとき、2つ以上のR1は同じであってもよいし、異なっていてもよい。
R2が2つ以上のとき、2つ以上のR2は同じであってもよいし、異なっていてもよい。
*は、結合手を表す。)
炭素原子数1~6のアルキル基としては、例えば、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、2-エチル-3-メチル-シクロプロピル基などが挙げられる。
これらの中でも炭素原子数1~4のアルキル基が好ましく、メチル基、エチル基がより好ましく、メチル基が特に好ましい。
m1及びm2は、それぞれ独立して、0~4の整数を表す。
R1が2つ以上のとき、2つ以上のR1は同じであってもよいし、異なっていてもよい。
R2が2つ以上のとき、2つ以上のR2は同じであってもよいし、異なっていてもよい。
Q1は、芳香族炭化水素環を有する2価の有機基を表す。
n1及びn2は、それぞれ独立して、0又は1を表す。)
R11及びR12は、それぞれ独立して、ハロゲン原子で置換されていてもよい炭素原子数1~13のアルキル基、ヒドロキシ基、メトキシ基、チオール基、アセチル基、ニトロ基、アリル基、フェニル基、ナフチル基、又はハロゲン原子を表す。
n11及びn12は、それぞれ独立して、0~4の整数を表す。
R11が2つ以上のとき、2つ以上のR11は、同じであってもよいし、異なっていてもよい。
R12が2つ以上のとき、2つ以上のR12は、同じであってもよいし、異なっていてもよい。)
m1及びm2は、それぞれ独立して、0~4の整数を表す。
R1が2つ以上のとき、2つ以上のR1は同じであってもよいし、異なっていてもよい。
R2が2つ以上のとき、2つ以上のR2は同じであってもよいし、異なっていてもよい。
X11は、下記式(1-2-1)~(1-2-3)のいずれかで表される2価の基を表す。Z11及びZ12は、それぞれ独立して、単結合又は下記式(1-2-4)で表される2価の基を表す。)
*は結合手を表す。*1は式(1-2)中の炭素原子に結合する結合手を表す。*2は式(1-2)中の窒素原子に結合する結合手を表す。)
本明細書において、アルキル基としては、直鎖状に限らず分岐状でもよく環状でもよい。直鎖状又は分岐状のアルキル基としては、例えば、メチル基、エチル基、イソプロピル基、tert-ブチル基、n-ヘキシル基などが挙げられる。環状のアルキル基(シクロアルキル基)としては、例えば、シクロブチル基、シクロペンチル基、シクロヘキシル基などが挙げられる。
本明細書において、アルコキシ基としては、例えば、メトキシ基、エトキシ基、n-ペンチルオキシ基、イソプロポキシ基などが挙げられる。
本明細書において、アルキルチオ基としては、例えば、メチルチオ基、エチルチオ基、n-ペンチルチオ基、イソプロピルチオ基などが挙げられる。
本明細書において、アルケニル基としては、例えば、エテニル基、1-プロペニル基、2-プロペニル基、1-メチル-1-エテニル基、1-ブテニル基、2-ブテニル基、3-ブテニル基、2-メチル-1-プロペニル基、2-メチル-2-プロペニル基などが挙げられる。
本明細書において、アルキニル基としては、上記「アルケニル基」に挙げられたアルケニル基の2重結合が3重結合に置き換えられている基が挙げられる。
本明細書において、アルケニルオキシ基としては、例えば、ビニルオキシ基、1-プロペニルオキシ基、2-n-プロペニルオキシ基(アリルオキシ基)、1-n-ブテニルオキシ基、プレニルオキシ基などが挙げられる。
本明細書において、アルキニルオキシ基としては、例えば、2-プロピニルオキシ基、1-メチル-2-プロピニルオキシ基、2-メチル-2-プロピニルオキシ基、2-ブチニルオキシ基、3-ブチニルオキシ基などが挙げられる。
本明細書において、アシル基としては、例えば、アセチル基、プロピオニル基などが挙げられる。
本明細書において、アリールオキシ基としては、例えば、フェノキシ基、ナフチルオキシなどが挙げられる。
本明細書において、アリールカルボニル基としては、例えば、フェニルカルボニル基などが挙げられる。
本明細書において、アラルキル基としては、例えば、ベンジル基、フェネチル基などが挙げられる。
本明細書において、アルキレン基としては、例えば、メチレン基、エチレン基、1,3-プロピレン基、2,2-プロピレン基、1-メチルエチレン基、1,4-ブチレン基、1-エチルエチレン基、1-メチルプロピレン基、2-メチルプロピレン基、1,5-ペンチレン基、1-メチルブチレン基、2-メチルブチレン基、1,1-ジメチルプロピレン基、1,2-ジメチルプロピレン基、1-エチルプロピレン基、2-エチルプロピレン基、1,6-ヘキシレン基、1,4-シクロヘキシレン基、1,8-オクチレン基、2-エチルオクチレン基、1,9-ノニレン基及び1,10-デシレン基等が挙げられる。
また、酸素原子若しくは硫黄原子で中断されていてもよい炭素原子数1~10のアルキル基には、酸素原子若しくは硫黄原子が2以上含まれていてもよい。
式(E)中のYとしては、例えば、置換基で置換されていてもよい脂肪族環から水素原子を1つ除いた1価の残基、置換基で置換されていてもよい1価の芳香族基が挙げられる。
置換基としては、例えば、ハロゲン原子、ヒドロキシ基、炭素原子数1~6のアルキル基、炭素原子数1~6のアルコキシ基などが挙げられる。
置換基で置換されていてもよい1価の芳香族基における芳香族基としては、例えば、芳香族炭化水素基が挙げられる。芳香族炭化水素基としては、例えば、フェニル基、ナフチル基、アントラセニル基などが挙げられる。
非環状脂肪族炭化水素基とは、直鎖状又は分岐鎖状のアルキル基、直鎖状又は分岐鎖状のアルケニル基、直鎖状又は分岐鎖状のアルキニル基、及びこれらの任意の組合せをいう。非環状脂肪族炭化水素基の炭素原子数は、好ましくは12未満、より好ましくは10未満である。
ポリマー(A)は、例えば、以下の反応(I)又は(II)により得られる。
(II):下記式(1A)で表される化合物と、下記式(2-1A)で表される化合物及び下記(2-2A)で表される化合物の少なくともいずれかと、式(EA)で表される化合物との反応。
式(2-2A)中、X11、Z11及びZ12は、それぞれ、式(1-2)中のX11、Z11及びZ12と同義である。)
ポリマー(A)の重量平均分子量の下限は、例えば、500、1,000、2,000、又は3,000である。
ポリマー(A)の重量平均分子量の上限は、例えば、100,000、50,000、又は30,000である。
膜構成成分とは、レジスト下層膜形成用組成物中の溶剤以外の成分を指す。
レジスト下層膜形成用組成物に使用される溶剤は、ポリマー(A)等の含有成分を均一に溶解できる溶剤であれば特に限定は無いが、一般的に半導体リソグラフィー工程用薬液に用いられる有機溶剤が好ましい。具体的には、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、メチルセロソルブアセテート、エチルセロソルブアセテート、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、プロピレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールプロピルエーテルアセテート、トルエン、キシレン、メチルエチルケトン、メチルイソブチルケトン、シクロペンタノン、シクロヘキサノン、シクロヘプタノン、4-メチル-2-ペンタノール、2-ヒドロキシイソ酪酸メチル、2-ヒドロキシイソ酪酸エチル、エトキシ酢酸エチル、酢酸2-ヒドロキシエチル、3-メトキシプロピオン酸メチル、3-メトキシプロピオン酸エチル、3-エトキシプロピオン酸エチル、3-エトキシプロピオン酸メチル、ピルビン酸メチル、ピルビン酸エチル、酢酸エチル、酢酸ブチル、乳酸エチル、乳酸ブチル、2-ヘプタノン、メトキシシクロペンタン、アニソール、γ-ブチロラクトン、N-メチルピロリドン、N,N-ジメチルホルムアミド、及びN,N-ジメチルアセトアミドが挙げられる。これらの溶剤は、単独で又は2種以上を組み合わせて用いることができる。
レジスト下層膜形成用組成物は、架橋剤を含有していてもよい。
架橋剤としては、特に制限されない。
架橋剤としては、例えば、下記式(C)で表される構造を2つ以上有する化合物が挙げられる。
結合手は、例えば、窒素原子、芳香族炭化水素環を構成する炭素原子などに結合している。
メラミン化合物としては、例えば、ヘキサメチロールメラミン、ヘキサメトキシメチルメラミン、ヘキサメチロールメラミンの1乃至6個のメチロール基がメトキシメチル化した化合物又はその混合物、ヘキサメトキシエチルメラミン、ヘキサアシロキシメチルメラミン、ヘキサメチロールメラミンのメチロール基の1乃至6個がアシロキシメチル化した化合物又はその混合物などが挙げられる。
グアナミン化合物としては、例えば、テトラメチロールグアナミン、テトラメトキシメチルグアナミン、テトラメチロールグアナミンの1乃至4個のメチロール基がメトキシメチル化した化合物又はその混合物、テトラメトキシエチルグアナミン、テトラアシロキシグアナミン、テトラメチロールグアナミンの1乃至4個のメチロール基がアシロキシメチル化した化合物又はその混合物などが挙げられる。
グリコールウリル化合物としては、例えば、テトラメチロールグリコールウリル、テトラメトキシグリコールウリル、テトラメトキシメチルグリコールウリル、テトラメチロールグリコールウリルのメチロール基の1乃至4個がメトキシメチル化した化合物又はその混合物、テトラメチロールグリコールウリルのメチロール基の1乃至4個がアシロキシメチル化した化合物又はその混合物などが挙げられる。
ウレア化合物としては、例えば、テトラメチロールウレア、テトラメトキシメチルウレア、テトラメチロールウレアの1乃至4個のメチロール基がメトキシメチル化した化合物又はその混合物、テトラメトキシエチルウレアなどが挙げられる。
R8、R9、R11及びR12はそれぞれ水素原子又はメチル基を示す。
R7及びR10はそれぞれ炭素原子数1乃至10のアルキル基、又は炭素原子数6乃至40のアリール基を示す。
n9は1≦n9≦3の整数、n10は2≦n10≦5の整数、n11は0≦n11≦3の整数、n12は0≦n12≦3の整数、3≦(n9+n10+n11+n12)≦6の整数を示す。
n13は1≦n13≦3の整数、n14は1≦n14≦4の整数、n15は0≦n15≦3の整数、n16は0≦n16≦3の整数、2≦(n13+n14+n15+n16)≦5の整数を示す。
m2は2乃至10の整数を示す。)
Q2におけるm2価の有機基としては、例えば、炭素原子数1~4のm2価の有機基が挙げられる。
レジスト下層膜形成用組成物に任意成分として含まれる硬化触媒は、熱酸発生剤、光酸発生剤何れも使用することができるが、熱酸発生剤を使用することが好ましい。
熱酸発生剤としては、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(ピリジニウム-p-トルエンスルホン酸)、ピリジニウムフェノールスルホン酸、ピリジニウム-p-ヒドロキシベンゼンスルホン酸(p-フェノールスルホン酸ピリジニウム塩)、ピリジニウム-トリフルオロメタンスルホン酸、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、ベンゼンジスルホン酸、1-ナフタレンスルホン酸、クエン酸、安息香酸、ヒドロキシ安息香酸、N-メチルモルホリン-p-トルエンスルホン酸、N-メチルモルホリン-p-ヒドロキシベンゼンスルホン酸、N-メチルモルホリン-5-スルホサリチル酸等のスルホン酸化合物及びカルボン酸化合物が挙げられる。
レジスト下層膜形成用組成物には、ピンホールやストリエーション等の発生がなく、表面むらに対する塗布性をさらに向上させるために、さらに界面活性剤を添加することができる。
これらの界面活性剤の配合量は、レジスト下層膜形成用組成物の全固形分に対して通常2.0質量%以下、好ましくは1.0質量%以下である。
これらの界面活性剤は単独で添加してもよいし、また2種以上の組合せで添加することもできる。
本発明のレジスト下層は、前述したレジスト下層膜形成用組成物の硬化物である。
レジスト下層膜は、例えば、前述したレジスト下層膜形成用組成物を半導体基板上に塗布し、焼成することにより製造することができる。
・測定装置名:エリプソ式膜厚測定装置RE-3100 ((株)SCREEN)
・SWE(単波長エリプソメータ)モード
・8点の算術平均(例えば、ウエハX方向に1cm間隔で8点測定)
本発明の積層体は、半導体基板と、本発明のレジスト下層膜とを備える。
半導体基板としては、例えば、前述の半導体基板が挙げられる。
レジスト下層膜は、例えば、半導体基板の上に配される。
本発明の半導体素子の製造方法は、少なくとも以下の工程を含む。
・半導体基板の上に、本発明のレジスト下層膜形成用組成物を用いて、レジスト下層膜を形成する工程、及び
・レジスト下層膜の上に、レジスト膜を形成する工程
・半導体基板の上に、本発明のレジスト下層膜形成用組成物を用いて、レジスト下層膜を形成する工程、
・レジスト下層膜の上に、レジスト膜を形成する工程
・レジスト膜にEB又はEUVを照射し、次いで、レジスト膜を現像し、レジストパターンを得る工程、及び
・レジストパターンをマスクに用い、レジスト下層膜をエッチングする工程
レジスト膜の膜厚としては、200nm以下が好ましく、150nm以下がより好ましく、100nm以下が更により好ましく、80nm以下が特に好ましい。また、レジスト膜の膜厚としては、10nm以上が好ましく、20nm以上がより好ましく、30nm以上が特に好ましい。
なお、本明細書においてはEBに応答するレジストもフォトレジストと称する。
フォトレジストとしては、ノボラック樹脂と1,2-ナフトキノンジアジドスルホン酸エステルとからなるポジ型フォトレジスト、酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと光酸発生剤からなる化学増幅型フォトレジスト、酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物とアルカリ可溶性バインダーと光酸発生剤とからなる化学増幅型フォトレジスト、及び酸により分解してアルカリ溶解速度を上昇させる基を有するバインダーと酸により分解してフォトレジストのアルカリ溶解速度を上昇させる低分子化合物と光酸発生剤からなる化学増幅型フォトレジスト、メタル元素を含有するレジストなどがある。例えば、JSR(株)製商品名V146G、シプレー社製商品名APEX-E、住友化学(株)製商品名PAR710、及び信越化学工業(株)製商品名AR2772、SEPR430等が挙げられる。また、例えば、Proc.SPIE,Vol.3999,330-334(2000)、Proc.SPIE,Vol.3999,357-364(2000)、やProc.SPIE,Vol.3999,365-374(2000)に記載されているような、含フッ素原子ポリマー系フォトレジストを挙げることができる。
R1及びR2は、それぞれ独立に、フッ素原子又はパーフルオロアルキル基を表す。
L1は、-O-、-S-、-COO-、-SO2-、又は、-SO3-を表す。
L2は、置換基を有していてもよいアルキレン基又は単結合を表す。
W1は、置換基を有していてもよい環状有機基を表す。
M+は、カチオンを表す。
R2は、ハロゲン原子を有してもよい炭素原子数1~6のアルキル基、水素原子又はハロゲン原子を表し、X1は、単結合、-CO-O-*又は-CO-NR4-*を表し、*は-Arとの結合手を表し、R4は、水素原子又は炭素原子数1~4のアルキル基を表し、Arは、ヒドロキシ基及びカルボキシル基からなる群から選ばれる1以上の基を有していてもよい炭素原子数6~20の芳香族炭化水素基を表す。]
酸の作用により現像液に対する溶解性が変化する基材成分(A)及びアルカリ現像液に対して分解性を示すフッ素添加剤成分(F)を含有し、
前記フッ素添加剤成分(F)は、塩基解離性基を含む構成単位(f1)と、下記一般式(f2-r-1)で表される基を含む構成単位(f2)と、を有するフッ素樹脂成分(F1)を含有する、レジスト組成物。
電子線の照射エネルギー及びEUVの露光量としては、特に制限されない。
ベーク温度としては、特に制限されないが、60℃~150℃が好ましく、70℃~120℃がより好ましく、75℃~110℃が特に好ましい。
ベーク時間としては、特に制限されないが、1秒間~10分間が好ましく、10秒間~5分間がより好ましく、30秒間~3分間が特に好ましい。
現像温度としては、例えば、5℃~50℃が挙げられる。
現像時間としては、例えば、10秒間~300秒間が挙げられる。
アルカリ現像液としては、例えば、水酸化ナトリウム、水酸化カリウム、炭酸ナトリウム、ケイ酸ナトリウム、メタケイ酸ナトリウム、アンモニア水等の無機アルカリ類、エチルアミン、n-プロピルアミン等の第一アミン類、ジエチルアミン、ジーn-ブチルアミン等の第二アミン類、トリエチルアミン、メチルジエチルアミン等の第三アミン類、ジメチルエタノールアミン、トリエタノールアミン等のアルコールアミン類、テトラメチルアンモニウムヒドロキシド、テトラエチルアンモニウムヒドロキシド、コリン等の第4級アンモニウム塩、ピロール、ピペリジン等の環状アミン類、等のアルカリ類の水溶液を使用することができる。さらに、上記アルカリ類の水溶液にイソプロピルアルコール等のアルコール類、ノニオン系等の界面活性剤を適当量添加して使用することもできる。これらの中で好ましい現像液は第四級アンモニウム塩の水溶液、さらに好ましくはテトラメチルアンモニウムヒドロキシドの水溶液及びコリンの水溶液である。さらに、これらの現像液に界面活性剤などを加えることもできる。アルカリ現像液に代えて、酢酸ブチル等の有機溶媒で現像を行い、フォトレジストのアルカリ溶解速度が向上していない部分を現像する方法を用いることもできる。
用いた半導体基板の表面に前記無機膜が形成されている場合、その無機膜の表面を露出させ、用いた半導体基板の表面に前記無機膜が形成されていない場合、その半導体基板の表面を露出させる。その後半導体基板を公知の方法(ドライエッチング法等)により半導体基板を加工する工程を経て、半導体素子が製造できる。
GPCカラム:Shodex GF-310HQ、Shodex GF-510HQ、Shodex GF-710HQ〔登録商標〕(昭和電工(株))
カラム温度:40℃
溶媒:N,N-ジメチルホルムアミド(DMF)
流量:0.6ml/分
標準試料:ポリスチレン(東ソー(株)製)
3,3’,5,5’-テトラメチルビフェニルジグリシジルエーテル(三菱ケミカル(株)製)4.00g、ビス(3,5-ジメチル-4-ヒドロキシフェニル)スルホン(東京化成工業(株)製)3.48g及びテトラブチルホスホニウムブロミド(北興化学工業(株)製)0.28gを、プロピレングリコールモノメチルエーテル31.01gに加え溶解した。反応容器を窒素置換後、120℃で24時間反応させ、ポリマー溶液を得た。GPC分析を行ったところ、得られたポリマー1は標準ポリスチレン換算にて重量平均分子量22600、分散度は3.4であった。ポリマー1中に存在する構造を下記式に示す。
3,3’,5,5’-テトラメチルビフェニルジグリシジルエーテル(三菱ケミカル(株)製)4.00g、2,2-ビス(4-ヒドロキシフェニル)ヘキサフルオロプロパン(東京化成工業(株)製)3.81g及びテトラブチルホスホニウムブロミド(北興化学工業(株)製)0.28gを、プロピレングリコールモノメチルエーテル12.13gに加え溶解した。反応容器を窒素置換後、120℃で24時間反応させ、ポリマー溶液を得た。GPC分析を行ったところ、得られたポリマー2は標準ポリスチレン換算にて重量平均分子量22000、分散度は2.8であった。ポリマー2中に存在する構造を下記式に示す。
3,3’,5,5’-テトラメチルビフェニルジグリシジルエーテル(三菱ケミカル(株)製)7.00g、ジエチルバルビタール(八代製薬(株)製)2.96g、3,5-ジヨードサリチル酸(東京化成工業(株)製)2.21g、及びテトラブチルホスホニウムブロミド(北興化学工業(株)製)0.48gを、プロピレングリコールモノメチルエーテル29.53gに加え溶解した。反応容器を窒素置換後、120℃で24時間反応させ、ポリマー溶液を得た。GPC分析を行ったところ、得られたポリマー3は標準ポリスチレン換算にて重量平均分子量5600、分散度は2.3であった。ポリマー3中に存在する構造を下記式に示す。
モノアリルジグリシジルイソシアヌル酸(四国化成工業株式会社製)5.00g、ビス(3,5-ジメチル-4-ヒドロキシフェニル)スルホン(東京化成工業(株)製)5.75g、2,6-ジ-tertブチル-p-クレゾール(東京化成工業(株)製)0.16g及びテトラブチルホスホニウムブロミド(北興化学工業(株)製)0.46gを、シクロヘキサノン45.45gに加え溶解した。反応容器を窒素置換後、120℃で24時間反応させ、ポリマー溶液を得た。GPC分析を行ったところ、得られたポリマー4は標準ポリスチレン換算にて重量平均分子量16200、分散度は2.9であった。ポリマー4中に存在する構造を下記式に示す。
モノアリルジグリシジルイソシアヌル酸(四国化成工業株式会社製)9.00g、2,2-ビス(4-ヒドロキシフェニル)ヘキサフルオロプロパン(東京化成工業(株)製)11.36g、2,6-ジ-tertブチル-p-クレゾール(東京化成工業(株)製)0.28g及びテトラブチルホスホニウムブロミド(北興化学工業(株)製)1.09gを、プロピレングリコールモノメチルエーテル26.56gに加え溶解した。反応容器を窒素置換後、120℃で24時間反応させ、ポリマー溶液を得た。GPC分析を行ったところ、得られたポリマー5は標準ポリスチレン換算にて重量平均分子量17500、分散度は2.4であった。ポリマー5中に存在する構造を下記式に示す。
上記合成例1~2、比較合成例1~2で得られたポリマー、架橋剤、硬化触媒、界面活性剤、溶剤を表1-1及び表1-2に示す割合で混合し、0.1μmのフッ素樹脂製のフィルターで濾過することによって、レジスト下層膜形成用組成物をそれぞれ調製した。
・PGME-PL:Imidazo[4,5-d]imidazole-2,5(1H,3H)-dione, tetrahydro-1,3,4,6-tetrakis[(2-methoxy-1-methylethoxy)methyl]-
・PyPSA:ピリジニウム-p-ヒドロキシベンゼンスルホン酸
・PGMEA:プロピレングリコールモノメチルエーテルアセテート
・PGME:プロピレングリコールモノメチルエーテル
・Cy:シクロヘキサノン
各添加量は質量部で示した。
なお、表1-1及び表1-2中のポリマーの添加割合はポリマー溶液の添加量ではなく、ポリマー自体の添加量を示した。
実施例1~2、及び比較例1~2のレジスト下層膜形成用組成物を、スピナーを用いてシリコンウェハー上にそれぞれ塗布した。そのシリコンウェハーを、ホットプレート上で205℃で60秒間ベークし、膜厚5nmのレジスト下層膜を得た。これらのレジスト下層膜をフォトレジストに使用する溶剤である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=70/30(体積比)の混合溶液に浸漬し、膜厚変化が1Å以下である場合に「良」、1Å超である場合に「不良」とした。その結果を表2に示す。
実施例1~2、及び比較例1~2のレジスト下層膜形成用組成物を、スピナーを用いてシリコンウェハー上にそれぞれ塗布した。そのシリコンウェハーを、ホットプレート上で205℃で60秒間ベークし、膜厚5nmのレジスト下層膜を得た。これらのレジスト下層膜を原子間力顕微鏡(AFM)を用いて表面粗さ(Sa)を測定し、表面粗さ(Sa)が3Å以下である場合に「良」、3Å超である場合に「不良」とした。その結果を表2に示す。
〔EUV露光装置によるレジストパターンの形成試験〕
実施例1~2、及び比較例1~2のレジスト下層膜形成用組成物を、スピナーを用いてシリコンウェハー上にそれぞれ塗布した。そのシリコンウェハーを、ホットプレート上で205℃で60秒間ベークし、膜厚5nmのレジスト下層膜を得た。そのレジスト下層膜上に、EUV用ポジ型レジスト溶液をスピンコートし、130℃で60秒間加熱し、EUVレジスト膜を形成した。そのレジスト膜に対し、EUV露光装置(NXE3400B)を用い、所定の条件で露光した。露光後、100℃で60秒間ベーク(PEB)を行い、クーリングプレート上で室温まで冷却し、フォトレジスト用現像液として2.38%テトラメチルアンモニウムヒドロキシド水溶液(NMD-3)を用いて30秒間パドル現像を行った。ホールサイズが17nm~20nmのレジストパターンを形成した。レジストパターンの測長には走査型電子顕微鏡((株)日立ハイテクノロジーズ製、CG6300)を用いた。
このようにして得られたフォトレジストパターンについて、20nmのコンタクトホール(C/H)の形成可否を評価した。実施例1~2及び比較例1~2の全ての場合で20nmC/Hパターン形成を確認した。また20nmホールを形成したEUV照射量を最適照射エネルギーとし、比較例1及び2をそれぞれ1.00とした時の照射エネルギー(mJ/cm2)を表3に示す。実施例1~2では比較例1~2と比較して感度の改善が確認された。
Claims (10)
- 前記ポリマーが、前記式(1)で表される構造を有する繰り返し単位として、下記式(1-1)で表される繰り返し単位を有する、請求項1に記載のレジスト下層膜形成用組成物。
(式(1-1)中、R1及びR2は、それぞれ独立して、ハロゲン原子で置換されていてもよい炭素原子数1~6のアルキル基、又はハロゲン原子を表す。
m1及びm2は、それぞれ独立して、0~4の整数を表す。
R1が2つ以上のとき、2つ以上のR1は同じであってもよいし、異なっていてもよい。
R2が2つ以上のとき、2つ以上のR2は同じであってもよいし、異なっていてもよい。
Q1は、芳香族炭化水素環を有する2価の有機基を表す。
n1及びn2は、それぞれ独立して、0又は1を表す。) - 前記Q1が、下記式(1-1-1)で表される、請求項2に記載のレジスト下層膜形成用組成物。
(式(1-1-1)中、Z1は、単結合、ハロゲン原子で置換されていてもよい炭素原子数1~6のアルキレン基、又はスルホニル基を表す。
R11及びR12は、それぞれ独立して、ハロゲン原子で置換されていてもよい炭素原子数1~13のアルキル基、ヒドロキシ基、メトキシ基、チオール基、アセチル基、ニトロ基、アリル基、フェニル基、ナフチル基、又はハロゲン原子を表す。
n11及びn12は、それぞれ独立して、0~4の整数を表す。
R11が2つ以上のとき、2つ以上のR11は、同じであってもよいし、異なっていてもよい。
R12が2つ以上のとき、2つ以上のR12は、同じであってもよいし、異なっていてもよい。) - m1及びm2が1であり、R1及びR2がメチル基である、請求項1に記載のレジスト下層膜形成用組成物。
- 架橋剤を含有する、請求項1に記載のレジスト下層膜形成用組成物。
- 請求項1から6のいずれかに記載のレジスト下層膜形成用組成物の硬化物である、レジスト下層膜。
- 半導体基板と、
請求項7に記載のレジスト下層膜と、
を備える積層体。 - 半導体基板の上に、請求項1から6のいずれかに記載のレジスト下層膜形成用組成物を用いて、レジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜を形成する工程と、
を含む、半導体素子の製造方法。 - 半導体基板の上に、請求項1から6のいずれかに記載のレジスト下層膜形成用組成物を用いて、レジスト下層膜を形成する工程と、
前記レジスト下層膜の上に、レジスト膜を形成する工程と、
前記レジスト膜にEB又はEUVを照射し、次いで、前記レジスト膜を現像し、レジストパターンを得る工程と、
前記レジストパターンをマスクに用い、前記レジスト下層膜をエッチングする工程と、
を含む、パターン形成方法。
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