WO2019059210A1 - レジスト下層膜形成組成物 - Google Patents
レジスト下層膜形成組成物 Download PDFInfo
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- WO2019059210A1 WO2019059210A1 PCT/JP2018/034584 JP2018034584W WO2019059210A1 WO 2019059210 A1 WO2019059210 A1 WO 2019059210A1 JP 2018034584 W JP2018034584 W JP 2018034584W WO 2019059210 A1 WO2019059210 A1 WO 2019059210A1
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- underlayer film
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
- H01L21/0276—Photolithographic processes using an anti-reflective coating
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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
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/10—Definition of the polymer structure
- C08G2261/14—Side-groups
- C08G2261/145—Side-chains containing sulfur
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
- H01L21/31116—Etching inorganic layers by chemical means by dry-etching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
- H01L21/31133—Etching organic layers by chemical means
- H01L21/31138—Etching organic layers by chemical means by dry-etching
Definitions
- the present invention provides a resist underlayer film forming composition which is excellent in all properties of solvent resistance, optical parameters, dry etching rate and embedding property, a resist underlayer film using the resist underlayer film forming composition, and a method for producing the same And a method of manufacturing a semiconductor device.
- the resist underlayer film formed for the purpose of suppressing this is also called an antireflective film.
- the resist underlayer film is required to be able to form a film easily by applying a solution-like composition for forming a resist underlayer film and curing it. Therefore, the composition needs to contain a compound (polymer) which is easily cured by heating or the like and has high solubility in a predetermined solvent.
- the resist pattern formed on the resist underlayer film preferably has a rectangular cross-sectional shape in the direction perpendicular to the substrate (a so-called straight hem without any undercut, footing, etc.).
- a so-called straight hem without any undercut, footing, etc. For example, if the resist pattern has an undercut shape or a bottomed shape, problems occur such as collapse of the resist pattern and processing of a workpiece (substrate, insulating film, etc.) into a desired shape or size during a lithography process. .
- the resist underlayer film is required to have a dry etching rate higher than that of the upper layer resist film, that is, a high selectivity ratio of the dry etching rate.
- the recess may be defective (void (clearance)) with the resist underlayer film simply by applying the composition for forming a resist underlayer film. There is also a need to be able to be embedded without being referred to.
- Patent Document 1 describes a resist underlayer film forming composition using a polymer having at least one sulfur atom in a structural unit.
- a resist underlayer film or an antireflective film having a dry etching rate higher than that of the resist film can be obtained.
- a gap fill material or a planarizing film capable of filling the recess of the substrate is required.
- Patent Document 1 does not describe or suggest the embeddability of the recess at all.
- Patent Document 2 describes a resist underlayer film forming composition using a copolymer having a triazine ring and a sulfur atom in its main chain. By using the composition described in Patent Document 2, it has a dry etching rate much higher than that of a resist film, functions as an anti-reflection film at the time of exposure without reducing the dry etching rate, and further the holes of the semiconductor substrate A resist underlayer film is obtained which can be embedded.
- Patent Document 3 discloses an antireflective film having a high etching rate, in which an epoxy novolac and a carboxylic acid are grafted.
- a resist underlayer film which has high dry etching rate, functions as an antireflective film at the time of exposure, can be embedded in a recess of a semiconductor substrate, and satisfies all these requirements.
- the recess is a narrow space and a high aspect ratio trench, it is not easy to completely embed the recess using a conventional resist underlayer film forming composition.
- the present invention has been made in view of such problems to be solved in order to provide a composition for forming a resist underlayer film which is excellent in all of the properties of solvent resistance, optical parameters, dry etching rate and embeddability.
- Another object of the present invention is to provide a resist underlayer film using the resist underlayer film forming composition and a method for producing the same, a method for forming a resist pattern, and a method for producing a semiconductor device.
- R 1 represents a C1-6 alkyl group which may be interrupted by a carboxy group, a C1-6 alkyl group which may be substituted by a hydroxy group, or a thiadiazole group which may be substituted by a C1-4 alkylthio group.
- R 2 is a hydrogen atom or the following formula (2): (In formula (2), the definition of R 1 is the same as the above. * Represents a bonding moiety.) Represents ] The resist underlayer film forming composition containing resin containing the unit structure represented by these.
- the resist underlayer film forming composition according to any one of [1] to [3] is coated on a semiconductor substrate to form a coating film, and the coating film is fired to form a resist underlayer film.
- a method of forming a resist pattern comprising the step of forming, which is used in the manufacture of a semiconductor.
- a step of forming a resist underlayer film comprising the composition for forming a resist underlayer film according to any one of [1] to [3] on a semiconductor substrate, Forming a resist film on the resist underlayer film; Forming a resist pattern by irradiating the resist film with light or an electron beam and then developing it; Forming a resist underlayer film patterned by etching the resist underlayer film through the formed resist pattern; Processing a semiconductor substrate with the patterned resist underlayer film;
- a method of manufacturing a semiconductor device comprising:
- the resist underlayer film forming composition of the present invention has good solvent resistance, optical parameters, dry etching rate and embeddability in combination to achieve finer substrate processing.
- the resist underlayer film forming composition of the present invention is effective for a lithography process using at least two layers of a resist underlayer film for the purpose of thinning a resist film thickness and using the resist underlayer film as an etching mask. is there.
- the resist underlayer film-forming composition according to the present invention has the following formula (1): [In the formula (1), R 1 represents a C1-6 alkyl group which may be interrupted by a carboxy group, a C1-6 alkyl group which may be substituted by a hydroxy group, or a thiadiazole group which may be substituted by a C1-4 alkylthio group. , R 2 is a hydrogen atom or the following formula (2): (In formula (2), the definition of R 1 is the same as the above. * Represents a bonding moiety.) Represents ] It is a resist underlayer film forming composition containing resin containing the unit structure represented by these.
- the C1-6 alkyl group is an alkyl group having 1 to 6 carbon atoms, and examples thereof include a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group and an n-hexyl group.
- a cyclic alkyl group such as a cyclohexyl group can be mentioned.
- a methyl group, an ethyl group and an n-propyl group are preferable, and an ethyl group and an n-propyl group are more preferable.
- the C1-6 alkyl group may be interrupted by a carboxy group, and the bonding direction may be either -COO- or -OCO-. Moreover, although there may be a plurality of interruptions, the singular is preferable.
- the C1-6 alkyl group may be substituted by a hydroxy group, and the number of substitution may be one or more.
- the plurality of hydroxy groups may be bonded to the same carbon atom, but are preferably bonded to different carbon atoms.
- the thiadiazole group may be any of 1,2,3-thiadiazole group, 1,2,5-thiadiazole group, and 1,3,4-thiadiazole group, preferably 1,3,4-thiadiazole group.
- the thiadiazole group may be substituted by a C1-4 alkylthio group, and the number of substitution may be one or more.
- Plural C1-4 alkylthio groups may be bonded to the same atom, but are preferably bonded to different atoms.
- the C1-4 alkylthio group is an alkyl group having 1 to 4 carbon atoms, and is, for example, a linear alkylthio group such as methylthio group, ethylthio group, n-propylthio group, n-butylthio group, isopropylthio group, sec And branched alkylthio groups such as -butylthio group and tert-butylthio group, and cyclic alkylthio groups such as cyclopropylthio group and cyclobutylthio group.
- a methylthio group, an ethylthio group and an n-propylthio group are preferable, and a methylthio group is most preferable.
- 1,2,3-thiadiazole group it is usual that one of the 4,5 positions be bonded to S and the other be bonded to any C1-4 alkylthio group.
- 1,2,5-thiadiazole group it is usual that one of the 3 and 4 positions be bonded to S and the other be bonded to any C1-4 alkylthio group.
- 1,3,4-thiadiazole group it is usual that one of the 2 and 5 positions be bonded to S and the other be bonded to any C1-4 alkylthio group.
- the resin containing the unit structure represented by the said Formula (1) can be manufactured by, for example, making the resin (A) containing an epoxy group, and the compound (B) which has a thiol group react. As a result, the resin becomes a polymer having a main chain derived from the resin (A) containing an epoxy group and a side chain derived from the compound (B) having a thiol group.
- Resin containing epoxy group (A) The resin (A) containing an epoxy group is typically a compound represented by the following general formula (3), and is classified into a phenol novolac epoxy resin and a cresol novolac epoxy resin.
- R is each independently a methyl group or a hydrogen atom, and n is an integer of 2 to 100.
- a phenol novolak epoxy resin As a resin (A) containing an epoxy group, a phenol novolak epoxy resin is preferable.
- the novolac epoxy resin include phenol novolac epoxy resin EPPN-501H (manufactured by Nippon Kayaku Co., Ltd.), phenol novolac epoxy resin D.I. E. N. TM 438 (manufactured by The Dow Chemical Company) and the like.
- the resin (A) containing an epoxy group may be used alone or in combination of two or more, but preferably three or less, more preferably two or less.
- Compound having a thiol group (B)
- the compound (B) having a thiol group either a monofunctional thiol compound having one thiol group in the molecule or a polyfunctional thiol compound having a plurality of thiol groups in the molecule can be used.
- thioglycolic acid monoethanolamine thioglycollate, methyl thioglycollate, octyl thioglycollate, methoxybutyl thioglycollate, ethylene glycol bisthioglycolate, butanediol bisthioglycolate, hexanediol Bisthioglycollate, trimethylolpropane tristhioglycollate, pentaerythritol tetrakisthioglycolate, 3-mercaptopropionic acid, methyl mercaptopropionate, methoxybutyl mercaptopropionate, octyl mercaptopropionate, tridecyl mercaptopropionate, ethylene glycol bis Thiopropionate, butanediol bisthiopropionate, trimethylolpropane tristhiopropionate, pentae Stilitol tetra
- thioglycolic acid monoethanolamine thioglycollate, methyl thioglycolate, octyl thioglycolate, methoxybutyl thioglycolate, thioglycerol, 2-mercapto-5-methylthio-1,3,4-thiadiazole, 2-Methylthio-5-mercapto-1,3,4-thiadiazole is preferred.
- the compounds (B) having a thiol group can be used alone or in combination of two or more.
- the resin (A) containing an epoxy group and the compound (B) having a thiol group can be optionally selected within the range described above, but the polymer obtained is the compound of the present invention described above. It is desirable that the composition be selected to give a resist underlayer film forming composition which is sufficiently soluble in the solvent used and passes through a microfilter with a pore size of 0.2 ⁇ m (more preferably, a pore size of 0.1 ⁇ m).
- the compounding ratio of the compound (B) having a thiol group is preferably 10 to 200 parts by weight, more preferably 20 to 100 parts by weight, most preferably 100 parts by weight of the resin (A) containing an epoxy group. Is 40 to 90 parts by weight.
- a catalyst used for reaction arbitrary things can be selected and used from a well-known catalyst.
- the amount of catalyst used is variously selected according to the type of acid used. Usually, it is 0.1 mol% to 20 mol%, preferably 0.5 to 10 mol%, more preferably 1 mol% to 5 mol% with respect to the epoxy mol number of the resin (A) containing an epoxy group.
- the above reaction is carried out without solvent but is usually carried out using a solvent. Any solvent can be used as long as it does not inhibit the reaction.
- the composition for forming a resist underlayer film according to the present invention is used in a uniform solution state, it is recommended to select from solvents generally used in the lithography process in consideration of the coating performance. Details are described in the following item 1.6.
- the reaction temperature is usually 23 ° 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 500 to 2,000,000, or 600 to 100,000, or 700 to 10,000, or 800 to 8,000, or 900 to 6 , 000.
- the resist underlayer film forming composition of the present invention preferably further contains a crosslinking agent, an acid and / or an acid generator, a solvent and other components. This will be described in order below.
- the resist underlayer film forming composition of the present invention can contain a crosslinking agent component.
- the crosslinking agent include melamines, substituted ureas, and polymer systems thereof.
- it is a crosslinking agent having at least two crosslinking substituents, and is methoxymethylated glycoluril, butoxymethylated glycoluril, methoxymethylated melamine, butoxymethylated melamine, methoxymethylated benzogguanamine, butoxymethylated benzogguanamine, Compounds such as methoxymethylated urea, butoxymethylated urea, or methoxymethylated thiourea.
- it is available as tetramethoxymethyl glycoluril (trade name: Powder Link 1174, manufactured by Nippon Cytech Industries, Ltd.).
- condensation products of these compounds can also be used.
- a highly heat-resistant crosslinking agent can be used as said crosslinking agent.
- a compound containing a crosslinking forming substituent having an aromatic ring for example, a benzene ring or a naphthalene ring
- an aromatic ring for example, a benzene ring or a naphthalene ring
- R 11 , R 12 , R 13 and R 14 are each a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
- the alkyl group having 1 to 10 carbon atoms includes a linear or branched alkyl group which may or may not have a substituent, and examples thereof include a methyl group, an ethyl group and an n-propyl group.
- n1 and n2 each represent an integer of 0 to 6
- n3 and n4 each represent an integer of 0 to 4.
- 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 (4-23) has a trade name TMOM-BP (Honshu Chemical Industry Co., Ltd.)
- the compound of the formula (4-24) has a trade name TM-BIP-A (Asahi) It can be obtained as Organic Material Industry Co., Ltd.).
- the addition amount of the crosslinking agent varies depending on the coating solvent to be used, the base substrate to be used, the required solution viscosity, the required film shape and the like, but it is preferably 0.001 to 80% by mass with respect to the total solid content. It is 0.01 to 50% by mass, more preferably 0.05 to 40% by mass.
- these crosslinking agents may cause a crosslinking reaction due to self condensation, they can cause a crosslinking reaction with the crosslinkable substituent in the above-mentioned polymer of the present invention.
- an acid and / or an acid generator can be added as a catalyst for promoting the above crosslinking reaction.
- an acid and / or an acid generator can be added as a catalyst for promoting the above crosslinking reaction.
- the resist underlayer film forming composition of the present invention can contain an acid generator.
- an acid generator a thermal acid generator and a photo-acid generator are mentioned.
- the photoacid generator produces an acid upon exposure of the resist. Therefore, the acidity of the lower layer film can be adjusted. This is one method for adjusting the acidity of the lower layer film to the acidity of the upper layer resist. Further, by adjusting the acidity of the lower layer film, the pattern shape of the resist formed on the upper layer can be adjusted.
- an onium salt compound, a sulfone imide compound, a disulfonyl diazomethane compound etc. are mentioned.
- sulfonimide compounds include N- (trifluoromethanesulfonyloxy) succinimide, N- (nonafluoronormal butanesulfonyloxy) succinimide, N- (camphorsulfonyloxy) succinimide and N- (trifluoromethanesulfonyloxy) naphthalimide It can be mentioned.
- disulfonyldiazomethane compounds include bis (trifluoromethylsulfonyl) diazomethane, bis (cyclohexylsulfonyl) diazomethane, bis (phenylsulfonyl) diazomethane, bis (p-toluenesulfonyl) diazomethane, bis (2,4-dimethylbenzenesulfonyl) And diazomethane, and methylsulfonyl-p-toluenesulfonyldiazomethane and the like.
- photoacid generator Only one photoacid generator can be used, or two or more can be used in combination.
- the proportion thereof is 0.01 to 5 parts by mass, 0.1 to 3 parts by mass, or 0 parts by weight with respect to 100 parts by mass of the solid content of the resist underlayer film forming composition. .5 to 1 part by mass.
- the resist underlayer film forming composition according to the present invention can be prepared by dissolving the above-described polymer in a solvent, and is used in a uniform solution state.
- any solvent that can dissolve the above-mentioned polymer can be used without particular limitation.
- a solvent generally used in the lithography process it is recommended to use a solvent generally used in the lithography process in consideration of the coating performance.
- solvent for example, methyl cellosolve acetate, ethyl cellosolve acetate, propylene glycol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, methyl isobutyl carbinol, propylene glycol monobutyl ether, propylene glycol monomethyl ether acetate, propylene glycol mono Ether ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monobutyl ether acetate, toluene, xylene, methyl ethyl ketone, cyclopentanone, cyclohexanone, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, ethyl ethoxyacetate , Hydroxy ethyl acetate, 2- Methyl droxy-3-methylbutanoate, methyl 3-methoxypropionate, e
- propylene glycol monomethyl ether propylene glycol monomethyl ether acetate, ethyl lactate, butyl lactate, cyclohexanone and the like are preferable.
- propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate are preferable.
- the resist underlayer film forming composition concerning this invention can also contain the compound represented by Formula (6) as a solvent.
- R 1 , R 2 and R 3 each represent a hydrogen atom, an oxygen atom, a sulfur atom or an alkyl group having 1 to 20 carbon atoms which may be interrupted by an amide bond, And may be different from each other, and may be combined with each other to form a ring structure
- the compound represented by the formula (6) can be used in combination with the above-described solvent, as long as the solvent is compatible with the compound and can dissolve the polymer.
- the alkyl group having 1 to 20 carbon atoms includes a linear or branched alkyl group which may or may not have a substituent, and examples thereof include a methyl group, an ethyl group and an n-propyl group. Isopropyl, n-butyl, sec-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, isohexyl, n-heptyl, n-octyl, cyclohexyl , 2-ethylhexyl group, n-nonyl group, isononyl group, p-tert-butylcyclohexyl group, n-decyl group, n-dodecyl nonyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentade
- Oxygen atom the alkyl group of a sulfur atom or an amide interrupted by coupling a 1 to 20 carbon atoms, for example, structural units -CH 2 -O -, - CH 2 -S -, - CH 2 -NHCO- or - Those containing CH 2 -CONH- can be mentioned.
- -O-, -S-, -NHCO- or -CONH- may be present in one or more units in the alkyl group.
- alkyl group having 1 to 20 carbon atoms interrupted by -O-, -S-, -NHCO- or -CONH- are methoxy, ethoxy, propoxy, butoxy, methylthio, ethylthio Group, propylthio group, butylthio group, methylcarbonylamino group, ethylcarbonylamino group, propylcarbonylamino group, butylcarbonylamino group, methylaminocarbonyl group, ethylaminocarbonyl group, propylaminocarbonyl group, butylaminocarbonyl group, etc.
- Preferred is a methoxy group, an ethoxy group, a methylthio group or an ethylthio group, and more preferred is a methoxy group or an ethoxy group.
- the compound represented by is preferable, and 3-methoxy-N, N-dimethylpropionamide and N, N-dimethylisobutyramide are particularly preferable as the compound represented by the formula (6).
- the compound represented by the above-mentioned formula (6) exerts an effect only by being contained in a very small amount in the resist underlayer film forming composition, and the compounding amount thereof is not particularly limited.
- the compound represented by the formula (6) is contained in an amount of 5% by weight or more based on the total weight of the resist underlayer film forming composition according to the present invention.
- the compound represented by the formula (6) is contained in an amount of 30% by weight or less based on the total weight of the resist underlayer film forming composition according to the present invention.
- a surfactant in the resist underlayer film forming composition according to the present invention, can be blended in order to further improve the coating property with respect to surface unevenness without occurrence of pinholes, striations and the like.
- surfactants include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether and polyoxyethylene oleyl ether, polyoxyethylene octyl phenol ether, polyoxyethylene nonyl phenol ether Such as polyoxyethylene alkyl allyl ethers, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate etc Sorbitan fatty acid esters, polyoxyethylene sorbitan monolaurate, polyoxyethylene sol Nonionic surfactants such as
- the compounding 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 forming composition.
- These surfactants may be used alone or in combination of two or more.
- the ratio thereof is 0.0001 to 5 parts by mass, or 0.001 to 1 parts by mass, or 0.01 to 100 parts by mass of the solid content of the resist underlayer film forming composition. To 0.5 parts by mass.
- a light absorber In the resist underlayer film forming composition for lithography of the present invention, a light absorber, a rheology modifier, an adhesion adjuvant and the like can be added.
- the rheology modifier is effective to improve the fluidity of the underlayer film forming composition.
- the adhesion aiding agent is effective to improve the adhesion between the semiconductor substrate or the resist and the underlayer film.
- Disperse Violet 43; C.I. I. Disperse Blue 96; C.I. I. C. Fluorescent Brightening Agents 112, 135 and 163; I. Solvent Orange 2 and 45; I. Solvent Red 1, 3, 8, 23, 24, 25, 25, and 49; I. Pigment Green 10; C.I. I. Pigment Brown 2 etc. can be used suitably.
- the above-mentioned light absorbing agent is usually blended in a proportion of 10% by mass or less, preferably 5% by mass or less, based on the total solid content of the resist underlayer film forming composition for lithography.
- the rheology modifier mainly improves the flowability of the resist underlayer film forming composition, and particularly in the baking step, improves the uniformity of the film thickness of the resist underlayer film and the filling property of the resist underlayer film forming composition into the inside of the hole. It is added for the purpose of enhancing.
- phthalic acid derivatives such as dimethyl phthalate, diethyl phthalate, diisobutyl phthalate, dihexyl phthalate, butyl isodecyl phthalate, etc., dinormal butyl adipate, diisobutyl adipate, adipic acid derivatives such as diisooctyl adipate, octyl decyl adipate, etc.
- maleic acid derivatives such as normal butyl malate, diethyl malate and dinonyl malate, oleic acid derivatives such as methyl oleate, butyl oleate and tetrahydrofurfurylate, or stearic acid derivatives such as normal butyl stearate and glyceryl stearate it can.
- oleic acid derivatives such as methyl oleate, butyl oleate and tetrahydrofurfurylate
- stearic acid derivatives such as normal butyl stearate and glyceryl stearate it can.
- the adhesion aiding agent is added mainly for the purpose of improving the adhesion between the substrate or the resist and the resist underlayer film forming composition, and in particular, for the purpose of preventing peeling of the resist in development.
- Specific examples thereof include chlorosilanes such as trimethyl chlorosilane, dimethyl methylol chlorosilane, methyl diphenyl chlorosilane, chloromethyl dimethyl chlorosilane, trimethyl methoxysilane, dimethyl diethoxysilane, methyl dimethoxysilane, dimethyl methylol ethoxy silane, diphenyl dimethoxysilane, Alkoxysilanes such as enyltriethoxysilane, hexamethyldisilazane, silazanes such as N, N′-bis (trimethylsilyl) urea, dimethyltrimethylsilylamine and trimethylsilylimidazole, methyloltrichlorosilane, ⁇ -
- Resist underlayer film forming composition The solid content of the resist underlayer film forming composition according to the present invention is usually 0.1 to 70% by mass, preferably 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 proportion of the polymer in the solid content is preferably in the order of 1 to 100% by mass, 1 to 99.9% by mass, 50 to 99.9% by mass, 50 to 95% by mass, and 50 to 90% by mass.
- One of the scales to evaluate whether the resist underlayer film forming composition is in a uniform solution state is to observe the passability of a specific microfilter, but the resist underlayer film forming composition according to the present invention is , Passing through a microfilter with a diameter of 0.2 ⁇ m and exhibiting a uniform solution state.
- the material of the microfilter is a fluorine-based resin such as PTFE (polytetrafluoroethylene) or PFA (tetrafluoroethylene-perfluoroalkylvinylether copolymer), PE (polyethylene), UPE (super high molecular weight polyethylene), PP (PP) Polypropylene), PSF (polysulfone), PES (polyethersulfone), nylon may be mentioned, but it is preferably made of PTFE (polytetrafluoroethylene).
- PTFE polytetrafluoroethylene
- PFA tetrafluoroethylene-perfluoroalkylvinylether copolymer
- PE polyethylene
- UPE super high molecular weight polyethylene
- PP PP
- Polypropylene polypropylene
- PSF polysulfone
- PES polyethersulfone
- nylon but it is preferably made of PTFE (polytetrafluoroethylene).
- the resist underlayer film which concerns on this invention is a baked product of the coating film which consists of an above-described resist underlayer film formation composition.
- Substrates used for manufacturing semiconductor devices for example, silicon wafer substrates, silicon / silicon dioxide coated substrates, silicon nitride substrates, glass substrates, ITO substrates, polyimide substrates, and low dielectric constant material (low-k material) coated substrates
- the resist underlayer film forming composition of the present invention is coated on a etc.) by a suitable coating method such as a spinner or a coater, and thereafter, a resist underlayer film is formed by baking.
- the firing conditions are usually selected appropriately from a firing temperature of 80 ° C. to 250 ° C. and a firing time of 0.3 to 60 minutes.
- the baking temperature is 150 ° C. to 250 ° C.
- the baking time is 0.5 to 2 minutes.
- the film thickness of the lower layer film to be formed is, for example, 10 to 1000 nm, 20 to 500 nm, 30 to 300 nm, 50 to 300 nm, or 50 to 200 nm.
- an inorganic resist lower layer film (hard mask) can be formed on the organic resist lower layer film according to the present invention.
- a Si-based inorganic material film can be formed by a CVD method or the like.
- a resist underlayer film forming composition according to the present invention is applied onto a semiconductor substrate (a so-called step substrate) having a portion having a step and a portion having no step, and firing is performed to obtain a portion having the step It is possible to form a resist underlayer film in which the level difference with the portion having no level difference is in the range of 3 to 50 nm.
- a layer of photoresist for example, is formed on the resist underlayer film.
- the formation of a layer of photoresist can be performed by a known method, that is, application of a photoresist composition solution on an underlying film and baking.
- the film thickness of the photoresist is, for example, 10 to 10,000 nm, 50 to 2,000 nm, or 100 to 1,000 nm.
- the photoresist formed on the resist underlayer film is not particularly limited as long as it is sensitive to the light used for exposure. Both negative and positive photoresists can be used. Positive-working photoresist consisting of novolac resin and 1,2-naphthoquinone diazide sulfonic acid ester, chemically amplified photoresist consisting of a binder having a group which is decomposed by an acid to increase alkali dissolution rate, and a photo-acid generator, acid A chemically amplified photoresist comprising a low molecular weight compound which decomposes to increase the alkali dissolution rate of the photoresist, an alkali soluble binder and a photoacid generator, and a binder having a group which is decomposed by an acid to increase the alkali dissolution rate There is a chemically amplified photoresist comprising a low molecular weight compound which is decomposed by an acid to increase the alkali dissolution rate of the
- trade name V146G manufactured by JSR Corporation, trade name APEX-E manufactured by Shipley, trade name PAR710 manufactured by Sumitomo Chemical Co., Ltd., trade name AR2772 manufactured by Shin-Etsu Chemical Co., Ltd., SEPR 430 etc. may be mentioned.
- exposure is performed through a predetermined mask.
- near ultraviolet light, far ultraviolet light, or extreme ultraviolet light for example, EUV (wavelength 13.5 nm)
- EUV extreme ultraviolet light
- a KrF excimer laser (wavelength 248 nm), an ArF excimer laser (wavelength 193 nm), an F 2 excimer laser (wavelength 157 nm) or the like can be used.
- ArF excimer laser wavelength 193 nm
- EUV wavelength 13.5 nm
- post exposure bake can also be performed if necessary.
- Post-exposure heating is performed under conditions appropriately selected from heating temperatures of 70 ° C. to 150 ° C. and heating times of 0.3 to 10 minutes.
- a resist for electron beam lithography can be used instead of a photoresist as the resist.
- the electron beam resist either negative or positive type can be used.
- Chemically amplified resist comprising a binder having a group that changes the alkali dissolution rate by being decomposed by an acid generator and an acid, a low molecular weight compound that changes the alkali dissolution rate of the resist by being decomposed by an alkali soluble binder, an acid generator and an acid
- a chemically amplified resist comprising a acid generator and a binder having a group capable of changing an alkali dissolution rate by an acid generator and an acid, and a chemically amplified resist comprising a low molecular compound capable of changing an alkali dissolution rate of the resist by being decomposed by an acid and an acid
- a non-chemically amplified resist comprising a binder having a group which is decomposed by an electron beam to change an alkali dissolution rate
- a developer for example, when a positive photoresist is used, the photoresist in the exposed portion is removed to form a photoresist pattern.
- the developer include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, aqueous solutions of quaternary ammonium hydroxides such as choline, ethanolamine, propylamine, An alkaline aqueous solution such as an aqueous amine solution such as ethylene diamine can be mentioned as an example. Furthermore, surfactants and the like can also be added to these developers.
- the conditions for development are suitably selected from a temperature of 5 to 50 ° C. and a time of 10 to 600 seconds.
- the inorganic lower layer film (intermediate layer) is removed using the pattern of the photoresist (upper layer) thus formed as a protective film, and then it is composed of the patterned photoresist and the inorganic lower layer film (intermediate layer)
- the organic lower layer film (lower layer) is removed using the film as a protective film.
- the semiconductor substrate is processed using the patterned inorganic lower layer film (intermediate layer) and the organic lower layer film (lower layer) as a protective film.
- the inorganic lower layer (intermediate layer) in the portion where the photoresist is removed is removed by dry etching to expose the semiconductor substrate.
- dry etching of inorganic underlayer film tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, carbon monoxide, argon, oxygen, nitrogen, six Gases such as sulfur fluoride, difluoromethane, nitrogen trifluoride and chlorine trifluoride, chlorine, trichloroborane and dichloroborane can be used.
- a halogen-based gas for dry etching of the inorganic lower layer film, and more preferable to use a fluorine-based gas.
- a fluorine-based gas for example, tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, difluoromethane (CH 2 F 2 ), etc. It can be mentioned.
- the organic lower layer film is removed using a film made of the patterned photoresist and the inorganic lower layer film as a protective film.
- the organic lower layer film (lower layer) is preferably performed by dry etching using an oxygen-based gas. This is because the inorganic underlayer film containing a large amount of silicon atoms is difficult to be removed by dry etching with an oxygen-based gas.
- processing of the semiconductor substrate is performed.
- the processing of the semiconductor substrate is preferably performed by dry etching with a fluorine-based gas.
- a fluorine-based gas for example, tetrafluoromethane (CF 4 ), perfluorocyclobutane (C 4 F 8 ), perfluoropropane (C 3 F 8 ), trifluoromethane, difluoromethane (CH 2 F 2 ), etc. It can be mentioned.
- an organic antireflective film can be formed on the upper layer of the resist lower layer film before the formation of the photoresist.
- the antireflective film composition to be used there, and any one of those conventionally used in the lithography process can be optionally selected and used, and a commonly used method, for example, a spinner
- the antireflective film can be formed by coating with a coater and baking.
- an inorganic lower layer film can be formed thereon, and a photoresist can be further coated thereon. This narrows the pattern width of the photoresist, and even when the photoresist is thinly coated to prevent pattern collapse, the substrate can be processed by selecting an appropriate etching gas.
- a fluorine-based gas that has a sufficiently high etching rate to the photoresist as an etching gas
- etch the fluorine-based gas that has a sufficiently high etching rate to the inorganic underlayer film The substrate can be processed as a gas, and further, the substrate can be processed using an oxygen-based gas that has a sufficiently high etching rate to the organic lower layer film as an etching gas.
- the resist underlayer film formed from the resist underlayer film forming composition may also have absorption for the light depending on the wavelength of light used in the lithography process. And in such a case, it can function as an anti-reflective film which has the effect of preventing the reflected light from a board
- the underlayer film of the present invention has a layer for preventing interaction between the substrate and the photoresist, and a function of preventing adverse effects on the substrate of a material used for the photoresist or a substance generated upon exposure to the photoresist.
- the layer a layer having a function of preventing the diffusion of a substance generated from the substrate to the upper layer photoresist during heating and firing, and a barrier layer for reducing the poisoning effect of the photoresist layer by the semiconductor substrate dielectric layer, etc. It is possible.
- the lower layer film formed of the resist lower layer film forming composition is applied to a substrate having a via hole used in a dual damascene process, and can be used as a filling material capable of filling holes without gaps. Moreover, it can also be used as a planarizing material for planarizing the surface of a semiconductor substrate with unevenness.
- the semiconductor substrate may be processed without the above-mentioned inorganic lower layer film (intermediate layer). That is, the organic lower layer film (lower layer, resist lower layer film of the present application) is removed using the pattern of the photoresist (upper layer) formed as described above as a protective film.
- the organic lower layer film (lower layer) is preferably performed by dry etching using an oxygen-based gas.
- the semiconductor substrate is processed using the organic lower layer film (lower layer) as a protective film. The processing of the semiconductor substrate is performed as described above.
- composition example 2 In a flask equipped with a stirrer, a thermometer, and a Dimroth condenser, 210.29 g of PGME, phenol novolac epoxy resin D.1. E. N. 3438 g of TM 438 (The Dow Chemical Company), 12.73 g of thioglycerol, 8.28 g of 2-mercapto-5-methylthio-1,3,4-thiadiazole, and 1.56 g of ethyltriphenylphosphonium bromide as a catalyst The reaction was allowed to proceed at 100.degree. C. for 24 hours to obtain a solution containing a reaction product. GPC analysis of the obtained reaction product showed that the weight average molecular weight was 3,250 in terms of standard polystyrene. The obtained reaction product is presumed to be a polymer having a structural unit represented by the following formula.
- composition example 3 In a flask equipped with a stirrer, thermometer, and Dimroth condenser, 310.14 g of PGME, 40.00 g of phenol novolac epoxy resin EPPN-501H (manufactured by Nippon Kayaku Co., Ltd.), 7.77 g of thioglycerol, 2-mercapto-5- After 27.54 g of methylthio-1,3,4-thiadiazole and 2.22 g of ethyltriphenylphosphonium bromide as a catalyst were added, reaction was carried out at 100 ° C. for 24 hours to obtain a solution containing a reaction product. GPC analysis of the obtained reaction product showed that it had a weight average molecular weight of 1,520 in terms of standard polystyrene. The obtained reaction product is presumed to be a polymer having a structural unit represented by the following formula.
- Example 1 2.24 g of PGME and 1.31 g of propylene glycol monomethyl ether acetate (hereinafter abbreviated as PGMEA) in 4.07 g of a solution containing 0.82 g of the polymer obtained in Synthesis Example 1 (a solvent is PGME used at the time of synthesis) 0.16 g of tetramethoxymethyl glycoluril (trade name: Powder Link 1174, manufactured by Nippon Cytec Industries, Ltd.), 3.06 g of a 1 mass% PGME solution of pyridinium trifluoromethanesulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), gallic acid Hydrate (Tokyo Chemical Industry Co., Ltd.
- PGMEA propylene glycol monomethyl ether acetate
- Example 2 In a solution containing 0.85 g of the polymer obtained in Synthesis Example 2 (a solvent is PGME used in the synthesis), 1.82 g of PGME, 1.31 g of PGMEA, tetramethoxymethyl glycoluril (trade name: Powder Link 1174, in 4.24 g of a solvent).
- Example 3 Into 4.04 g of a solution containing 0.81 g of a polymer (a solvent is PGME used in the synthesis) obtained in Synthesis Example 3, PGME 1.34 g, PGMEA 1.32 g, tetramethoxymethyl glycoluril (trade name: Powderlink 1174) , 0.16 g of Nippon Cytech Industries Ltd., 4.04 g of 1% by mass PGME solution of pyridinium paraphenol sulfonate (manufactured by Tokyo Chemical Industry Co., Ltd.), gallic acid hydrate (manufactured by Tokyo Chemical Industry Co., Ltd.) 4.04 g of a 1% by mass PGME solution and 0.08 g of a 1% by mass PGME solution as a surfactant (manufactured by DIC Corporation, trade name: R-30N) were mixed to obtain a 7% by mass solution. The solution was filtered using a polytetrafluoroethylene microfilter with a pore size
- the resist underlayer film forming compositions prepared in Examples 1 to 3 and Comparative Example 1 were each coated on a silicon wafer by a spinner. Thereafter, the obtained coated film was baked on a hot plate at a temperature of 215 ° C. for 1 minute to form a resist underlayer film (film thickness 0.2 ⁇ m).
- the refractive index (n value) and the attenuation coefficient (k value) at a wavelength of 193 nm were then measured using a spectroscopic ellipsometer (VUV-VASE VU-302, manufactured by JA Woollam) for these resist underlayer films. did.
- the results are shown in Table 1 below.
- the k value at 193 nm is desirably 0.1 or more.
- the dry etching rate of this photoresist film was measured under the conditions using N 2 as a dry etching gas, using the above-mentioned RIE system manufactured by Samco Co., Ltd.
- the dry etching rates of the respective resist underlayer films were calculated as "selectivity".
- the selectivity In order to process well using dry etching, it is desirable for the selectivity to be 1.5 or more. The results are shown in Table 1 below.
- the line width of the photoresist and the width between the lines of the photoresist after development Is 0.10 .mu.m, that is, 0.10 .mu.mL / S (dense line), and exposure is performed through a photomask set to form 100 such lines.
- the obtained exposed film is subjected to post exposure bake (PEB) on a hot plate at 110 ° C. for 60 seconds on a hot plate, and after cooling, it is 0.26 as a developer in a 60 seconds single paddle process of industry standard.
- PEB post exposure bake
- Each of the resist underlayer film forming compositions prepared in Examples 1 to 3 and Comparative Example 1 has a plurality of trenches (width 0.01 ⁇ m, depth 0.23 ⁇ m) by a spinner, and the SiO 2 film is on the surface formed silicon wafers (hereinafter, in this specification. abbreviated as SiO 2 wafer) was applied on. Thereafter, the obtained coated film was baked on a hot plate at a temperature of 215 ° C. for 1 minute to form a resist underlayer film (film thickness 0.2 ⁇ m).
- FIG. 2 shows a schematic view of the SiO 2 wafer 4 used in this test and the lower layer film 3 formed on the wafer.
- the SiO 2 wafer 4 has a dense pattern of trenches, and the dense pattern is a pattern in which the distance from the center of the trench to the center of the adjacent trench is 10 times the width of the trench. As shown in FIG. 2, the depth 1 of the trench of the SiO 2 wafer 4 is 0.23 ⁇ m, and the width 2 of the trench is 0.01 ⁇ m.
- the cross-sectional shape of the SiO 2 wafer in which the resist underlayer film is formed on the SiO 2 wafer using the resist underlayer film forming compositions of Examples 1 to 3 and Comparative Example 1 is a scanning electron
- the embedding (fillability) in the trench of the SiO 2 wafer by the resist underlayer film was evaluated by observing using a microscope (SEM).
- a sample in which the entire trench was completely embedded was ⁇ , and a sample in which a void (gap) was generated in the trench was x.
- the results are shown in Table 1 and the SEM images of the cross section are shown in FIG.
- the resist underlayer film formed from the resist underlayer film forming composition prepared in Examples 1 to 3 exhibited excellent properties with respect to solvent resistance, optical parameters, dry etching rate, and embeddability.
- the resist underlayer film formed from the resist underlayer film forming composition prepared in Comparative Example 1 has a low dry etching rate and insufficient burying property.
- the resist underlayer film forming composition prepared in Examples 1 to 3 can be a resist underlayer film having a high dry etching rate, a good embedding property, and an antireflective ability in an ArF process. .
- the resist underlayer film forming composition which concerns on this invention provides a resist underlayer film which is excellent in all the characteristics of solvent resistance, an optical parameter, a dry etching rate, and embeddability.
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Abstract
Description
[1] 下記式(1):
[式(1)中、
R1は、カルボキシ基で中断されていてもよいC1~6アルキル基、ヒドロキシ基で置換されていてもよいC1~6アルキル基又はC1~4アルキルチオ基で置換されていてもよいチアジアゾール基を表し、
R2は、水素原子又は下記式(2):
(式(2)中、R1の定義は上記と同一である。*は結合部分を表す。)
を表す。]
で表される単位構造を含む樹脂を含む、レジスト下層膜形成組成物。
[2] エポキシ基を含む樹脂(A)と、チオール基を有する化合物(B)を反応させて得られる樹脂を含む、レジスト下層膜形成組成物。
[3] 前記エポキシ基を含む樹脂(A)がフェノールノボラック型エポキシ樹脂である、[2]に記載のレジスト下層膜形成組成物。
[4] [1]から[3]の何れか1項に記載のレジスト下層膜形成組成物からなる塗布膜の焼成物であることを特徴とするレジスト下層膜。
[5] [1]から[3]の何れか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て塗布膜を形成し、その塗布膜を焼成してレジスト下層膜を形成する工程を含み、半導体の製造に用いることを特徴とするレジストパターンの形成方法。
[6] 半導体基板上に、[1]から[3]の何れか1項に記載のレジスト下層膜形成組成物からなる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、
レジスト膜に対する光又は電子線の照射とその後の現像によりレジストパターンを形成する工程と、
形成された前記レジストパターンを介して前記レジスト下層膜をエッチングすることによりパターン化されたレジスト下層膜を形成する工程と、
パターン化された前記レジスト下層膜により半導体基板を加工する工程と、
を含むことを特徴とする、半導体装置の製造方法。
特に、本発明のレジスト下層膜形成組成物は、レジスト膜厚の薄膜化を目的としたレジスト下層膜を少なくとも2層形成し、該レジスト下層膜をエッチングマスクとして使用するリソグラフィープロセスに対して有効である。
本発明に係るレジスト下層膜形成組成物は、下記式(1):
[式(1)中、
R1は、カルボキシ基で中断されていてもよいC1~6アルキル基、ヒドロキシ基で置換されていてもよいC1~6アルキル基又はC1~4アルキルチオ基で置換されていてもよいチアジアゾール基を表し、
R2は、水素原子又は下記式(2):
(式(2)中、R1の定義は上記と同一である。*は結合部分を表す。)
を表す。]
で表される単位構造を含む樹脂を含む、レジスト下層膜形成組成物である。
1,2,5-チアジアゾール基の場合、3、4位の一方がSと結合し、他方が任意のC1~4アルキルチオ基と結合するのが通常である。
1,3,4-チアジアゾール基の場合、2、5位の一方がSと結合し、他方が任意のC1~4アルキルチオ基と結合するのが通常である。
エポキシ基を含む樹脂(A)は、典型的には、下記一般式(3)で表される化合物であり、フェノールノボラック型エポキシ樹脂、クレゾールノボラック型エポキシ樹脂に分類される。
チオール基を有する化合物(B)は、分子中にチオール基が一つの単官能チオール化合物と、分子中に複数のチオール基を有する多官能チオール化合物のいずれも用いることができる。具体的なものとしては、チオグリコール酸、チオグリコール酸モノエタノールアミン、チオグリコール酸メチル、チオグリコール酸オクチル、チオグリコール酸メトキシブチル、エチレングリコールビスチオグリコレート、ブタンジオールビスチオグリコレート、ヘキサンジオールビスチオグリコレート、トリメチロールプロパントリスチオグリコレート、ペンタエリスリトールテトラキスチオグリコレート、3-メルカプトプロピオン酸、メルカプトプロピオン酸メチル、メルカプトプロピオン酸メトキシブチル、メルカプトプロピオン酸オクチル、メルカプトプロピオン酸トリデシル、エチレングリコールビスチオプロピオネート、ブタンジオールビスチオプロピオネート、トリメチロールプロパントリスチオプロピオネート、ペンタエリスリトールテトラキスチオプロピオネート、ペンタエリスリトールテトラキス(3-メルカプトブチレート)、トリメチロールプロパントリス(3-メルカプトブチレート)、トリメチロールエタントリス(3-メルカプトブチレート)、チオグリセロール、4―メルカプト-5-メチルチオ-1,2,3-チアジアゾール、4-メチルチオ-5―メルカプト-1,2,3-チアジアゾール、3―メルカプト-4-メチルチオ-1,2,5-チアジアゾール、3-メチルチオ-4―メルカプト-1,2,5-チアジアゾール、2―メルカプト-5-メチルチオ-1,3,4-チアジアゾール、2-メチルチオ-5―メルカプト-1,3,4-チアジアゾール等を挙げることができる。
エポキシ基を含む樹脂(A)及びチオール基を有する化合物(B)は、上に説明した範囲内で任意に選択することができるが、得られる重合体が、上に述べた本発明に使用する溶媒に十分に溶解し、孔径0.2μm(より好ましくは口径0.1μm)のミクロフィルターを通過するレジスト下層膜形成組成物を与えるように選択されることが望ましい。
本発明のレジスト下層膜形成組成物は架橋剤成分を含むことができる。その架橋剤としては、メラミン系、置換尿素系、またはそれらのポリマー系等が挙げられる。好ましくは、少なくとも2個の架橋形成置換基を有する架橋剤であり、メトキシメチル化グリコールウリル、ブトキシメチル化グリコールウリル、メトキシメチル化メラミン、ブトキシメチル化メラミン、メトキシメチル化ベンゾグワナミン、ブトキシメチル化ベンゾグワナミン、メトキシメチル化尿素、ブトキシメチル化尿素、またはメトキシメチル化チオ尿素等の化合物である。例えば、テトラメトキシメチルグリコールウリル(商品名:パウダーリンク1174,日本サイテックインダストリーズ(株)製)として入手可能である。また、これらの化合物の縮合体も使用することができる。
上記R11、R12、R13、及びR14は水素原子又は炭素数1乃至10のアルキル基である。炭素原子数1乃至10のアルキル基としては、置換基を有しても有さなくてもよい、直鎖または分岐を有するアルキル基が挙げられ、例えば、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、sec-ブチル基、tert-ブチル基、n-ペンチル基、イソペンチル基、ネオペンチル基、n-ヘキシル基、イソヘキシル基、n-ヘプチル基、n-オクチル基、シクロヘキシル基、2-エチルヘキシル基、n-ノニル基、イソノニル基、p-tert-ブチルシクロヘキシル基、n-デシル基などが挙げられる。
n1及びn2は各々0~6の整数、n3及びn4は各々0~4の整数を表す。
本発明では上記架橋反応を促進するための触媒として酸及び/又は酸発生剤を添加することができる。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-トルエンスルホン酸、サリチル酸、5-スルホサリチル酸、4-フェノールスルホン酸、カンファースルホン酸、4-クロロ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、ナフタレンカルボン酸等の酸性化合物、及び/又は2,4,4,6-テトラブロモシクロヘキサジエノン、ベンゾイントシレート、2-ニトロベンジルトシレート、ピリジニウムp-ヒドロキシベンゼンスルホナート、ピリジニウムp-トルエンスルホナート、ピリジニウムトリフルオロメタンスルホナート等のピリジニウム塩系化合物、その他有機スルホン酸アルキルエステル等の熱酸発生剤を配合する事が出来る。配合量は全固形分に対して、0.0001乃至20質量%、好ましくは0.0005乃至10質量%、さらに好ましくは0.01乃至3質量%である。
光酸発生剤が使用される場合、その割合としては、レジスト下層膜形成組成物の固形分100質量部に対して、0.01乃至5質量部、または0.1乃至3質量部、または0.5乃至1質量部である。
本発明に係るレジスト下層膜形成組成物は、上記重合体を溶媒に溶解させることによって調製することができ、均一な溶液状態で用いられる。
(式(6)中のR1、R2及びR3は各々水素原子、酸素原子、硫黄原子又はアミド結合で中断されていてもよい炭素原子数1~20のアルキル基を表し、互いに同一であっても異なっても良く、互いに結合して環構造を形成しても良い。)
式(6)で表される化合物は、これと相溶性で、上記重合体を溶解できる溶媒であれば、上記した溶媒と併用することができる。
下記式:
で表される化合物が好ましく、式(6)で表される化合物として特に好ましいのは、3-メトキシ-N,N-ジメチルプロピオンアミド、及びN,N-ジメチルイソブチルアミドである。
本発明に係るレジスト下層膜形成組成物には、ピンホールやストレ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、界面活性剤を配合することができる。界面活性剤としては、例えばポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンセチルエーテル、ポリオキシエチレンオレイルエーテル等のポリオキシエチレンアルキルエーテル類、ポリオキシエチレンオクチルフェノールエーテル、ポリオキシエチレンノニルフェノールエーテル等のポリオキシエチレンアルキルアリルエーテル類、ポリオキシエチレン・ポリオキシプロピレンブロックコポリマー類、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノステアレート、ソルビタンモノオレエート、ソルビタントリオレエート、ソルビタントリステアレート等のソルビタン脂肪酸エステル類、ポリオキシエチレンソルビタンモノラウレート、ポリオキシエチレンソルビタンモノパルミテート、ポリオキシエチレンソルビタンモノステアレート、ポリオキシエチレンソルビタントリオレエート、ポリオキシエチレンソルビタントリステアレート等のポリオキシエチレンソルビタン脂肪酸エステル類等のノニオン系界面活性剤、エフトップEF301、EF303、EF352((株)トーケムプロダクツ製、商品名)、メガファックF171、F173、R-40、R-40N、R-40LM(DIC(株)製、商品名)、フロラードFC430、FC431(住友スリーエム(株)製、商品名)、アサヒガードAG710、サーフロンS-382、SC101、SC102、SC103、SC104、SC105、SC106(旭硝子(株)製、商品名)等のフッ素系界面活性剤、オルガノシロキサンポリマーKP341(信越化学工業(株)製)等を挙げることができる。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使用してもよいし、また二種以上の組み合わせで使用することもできる。界面活性剤が使用される場合、その割合としては、レジスト下層膜形成組成物の固形分100質量部に対して0.0001乃至5質量部、または0.001乃至1質量部、または0.01乃至0.5質量部である。
本発明のリソグラフィー用レジスト下層膜形成組成物には、吸光剤、レオロジー調整剤、接着補助剤などを添加することができる。レオロジー調整剤は、下層膜形成組成物の流動性を向上させるのに有効である。接着補助剤は、半導体基板またはレジストと下層膜の密着性を向上させるのに有効である。
本発明に係るレジスト下層膜形成組成物の固形分は通常0.1乃至70質量%、好ましくは0.1乃至60質量%とする。固形分はレジスト下層膜形成組成物から溶媒を除いた全成分の含有割合である。固形分中における重合体の割合は、1乃至100質量%、1乃至99.9質量%、50乃至99.9質量%、50乃至95質量%、50乃至90質量%の順で好ましい。
以下、本発明に係るレジスト下層膜形成組成物を用いたレジスト下層膜及び半導体装置の製造方法について説明する。
半導体装置の製造に使用される基板(例えば、シリコンウエハー基板、シリコン/二酸化シリコン被覆基板、シリコンナイトライド基板、ガラス基板、ITO基板、ポリイミド基板、及び低誘電率材料(low-k材料)被覆基板等)の上に、スピナー、コーター等の適当な塗布方法により本発明のレジスト下層膜形成組成物が塗布され、その後、焼成することによりレジスト下層膜が形成される。焼成する条件としては、焼成温度80℃乃至250℃、焼成時間0.3乃至60分間の中から適宜選択されるのが通常である。好ましくは、焼成温度150℃乃至250℃、焼成時間0.5乃至2分間である。ここで、形成される下層膜の膜厚としては、例えば、10乃至1000nmであり、又は20乃至500nmであり、又は30乃至300nmであり、又は50乃至300nmであり、又は50乃至200nmである。
現像液としては、水酸化カリウム、水酸化ナトリウムなどのアルカリ金属水酸化物の水溶液、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム、コリンなどの水酸化四級アンモニウムの水溶液、エタノールアミン、プロピルアミン、エチレンジアミンなどのアミン水溶液等のアルカリ性水溶液を例として挙げることができる。さらに、これらの現像液に界面活性剤などを加えることもできる。現像の条件としては、温度5乃至50℃、時間10乃至600秒から適宜選択される。
フッ素系ガスとしては、例えば、テトラフルオロメタン(CF4)、パーフルオロシクロブタン(C4F8)、パーフルオロプロパン(C3F8)、トリフルオロメタン、及びジフルオロメタン(CH2F2)等が挙げられる。
下記合成例で得られた反応生成物の重量平均分子量の測定に用いた装置を示す。
装置:東ソー(株)製HLC-8320GPC
GPCカラム:Asahipak〔登録商標〕GF-310HQ、同GF-510HQ、同GF-710HQ
カラム温度:40℃
流量:0.6mL/分
溶離液:DMF
標準試料:ポリスチレン
撹拌器、温度計、ジムロート冷却管を装着したフラスコにプロピレングリコールモノメチルエーテル(以下PGMEと略称する。)197.62g、フェノールノボラック型エポキシ樹脂D.E.N.TM438(ザ・ダウケミカルカンパニー製)30.00g、チオグリコール酸メチル17.84g、及び触媒としてエチルトリフェニルホスホニウムブロマイド1.56gを添加した後、100℃で24時間反応させ、反応生成物を含む溶液を得た。得られた反応生成物のGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は3,100であった。得られた反応生成物は、下記式で表される構造単位を有する重合体と推定される。
撹拌器、温度計、ジムロート冷却管を装着したフラスコにPGME210.29g、フェノールノボラック型エポキシ樹脂D.E.N.TM438(ザ・ダウケミカルカンパニー製)30.00g、チオグリセロール12.73g、2―メルカプト-5-メチルチオ-1,3,4-チアジアゾール8.28g、及び触媒としてエチルトリフェニルホスホニウムブロマイド1.56gを添加した後、100℃で24時間反応させ、反応生成物を含む溶液を得た。得られた反応生成物のGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は3,250であった。得られた反応生成物は、下記式で表される構造単位を有する重合体と推定される。
撹拌器、温度計、ジムロート冷却管を装着したフラスコにPGME310.14g、フェノールノボラック型エポキシ樹脂EPPN-501H(日本化薬株式会社製)40.00g、チオグリセロール7.77g、2―メルカプト-5-メチルチオ-1,3,4-チアジアゾール27.54g、及び触媒としてエチルトリフェニルホスホニウムブロマイド2.22gを添加した後、100℃で24時間反応させ、反応生成物を含む溶液を得た。得られた反応生成物のGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は1,520であった。得られた反応生成物は、下記式で表される構造単位を有する重合体と推定される。
撹拌器、温度計、ジムロート冷却管を装着したフラスコにPGME208.36g、フェノールノボラック型エポキシ樹脂D.E.N.TM438(ザ・ダウケミカルカンパニー製)30.00g、安息香酸20.53g、及び触媒としてエチルトリフェニルホスホニウムブロマイド1.56gを添加した後、100℃で24時間反応させ、反応生成物を含む溶液を得た。得られた反応生成物のGPC分析を行ったところ、標準ポリスチレン換算にて重量平均分子量は3,200であった。得られた反応生成物は、下記式で表される構造単位を有する重合体と推定される。
(実施例1)
合成例1で得られた重合体0.82gを含む溶液(溶剤は合成時に用いたPGME)4.07gに、PGME2.24g、プロピレングリコールモノメチルエーテルアセテート(以下PGMEAと略称する。)1.31g、テトラメトキシメチルグリコールウリル(商品名:パウダーリンク1174,日本サイテックインダストリーズ(株)製)0.16g、ピリジニウムトリフルオロメタンスルホナート(東京化成工業(株)製)1質量%PGME溶液3.06g、没食子酸水和物(東京化成工業(株)製)1質量%PGME溶液4.07g、及び界面活性剤(DIC(株)製、商品名:R-30N)1質量%PGME溶液0.08gを混合し、7質量%溶液とした。その溶液を、孔径0.2μmのポリテトラフルオロエチレン製ミクロフィルターを用いてろ過して、レジスト下層膜形成組成物を調製した。
合成例2で得られた重合体0.85gを含む溶液(溶剤は合成時に用いたPGME)4.24gに、PGME1.82g、PGMEA1.31g、テトラメトキシメチルグリコールウリル(商品名:パウダーリンク1174,日本サイテックインダストリーズ(株)製)0.13g、K-PURE〔登録商標〕TAG2689(King Industries社製)1質量%PGME溶液3.18g、没食子酸水和物(東京化成工業(株)製)1質量%PGME溶液4.24g、及び界面活性剤(DIC(株)製、商品名:R-30N)1質量%PGME溶液0.08gを混合し、7質量%溶液とした。その溶液を、孔径0.2μmのポリテトラフルオロエチレン製ミクロフィルターを用いてろ過して、レジスト下層膜形成組成物を調製した。
合成例3で得られた、重合体0.81gを含む溶液4.04g(溶剤は合成時に用いたPGME)に、PGME1.34g、PGMEA1.32g、テトラメトキシメチルグリコールウリル(商品名:パウダーリンク1174,日本サイテックインダストリーズ(株)製)0.16g、ピリジニウムパラフェノールスルホナート(東京化成工業(株)製)1質量%PGME溶液4.04g、没食子酸水和物(東京化成工業(株)製)1質量%PGME溶液4.04g、及び界面活性剤(DIC(株)製、商品名:R-30N)1質量%PGME溶液0.08gを混合し、7質量%溶液とした。その溶液を、孔径0.2μmのポリテトラフルオロエチレン製ミクロフィルターを用いてろ過して、レジスト下層膜形成組成物を調製した。
比較例1で得られた重合体0.82gを含む溶液4.11g(溶剤は合成時に用いたPGME)に、PGME7.23g、PGMEA1.31g、テトラメトキシメチルグリコールウリル(商品名:パウダーリンク1174,日本サイテックインダストリーズ(株)製)0.21g、ピリジニウムパラフェノールスルホナート(東京化成工業(株)製)1質量%PGME溶液2.06g、及び界面活性剤(DIC(株)製、商品名:R-30N)1質量%PGME溶液0.08gを混合し、7質量%溶液とした。その溶液を、孔径0.2μmのポリテトラフルオロエチレン製ミクロフィルターを用いてろ過して、レジスト下層膜形成組成物を調製した。
実施例1及至3、比較例1で調製したレジスト下層膜形成組成物を、それぞれ、スピナーにより、シリコンウエハー上に塗布した。その後、得られた塗布膜をホットプレート上で215℃の温度で1分間ベークし、レジスト下層膜(膜厚0.2μm)を形成した。これらのレジスト下層膜を、フォトレジスト溶液に使用される溶剤であるPGME及びプロピレングリコールモノメチルエーテルアセテートに浸漬し、両溶剤に不溶であることを確認した。また、フォトレジスト現像用のアルカリ現像液(2.38質量%水酸化テトラメチルアンモニウム水溶液)に浸漬し、当該現像液に不溶であることを確認した。不溶である場合を○、溶解した場合を×とした。結果を表1に示す。
実施例1及至3、比較例1で調製したレジスト下層膜形成組成物を、それぞれ、スピナーにより、シリコンウエハー上に塗布した。その後、得られた塗布膜をホットプレート上で215℃の温度で1分間ベークし、レジスト下層膜(膜厚0.2μm)を形成した。そして、これらのレジスト下層膜について、分光エリプソメーター(J.A.Woollam社製、VUV-VASE VU-302)を用い、波長193nmでの屈折率(n値)及び減衰係数(k値)を測定した。その結果を下記表1に示す。上記レジスト下層膜が十分な反射防止機能を有するためには、193nmでのk値は0.1以上であることが望ましい。
実施例1及至3、比較例1で調製した各レジスト下層膜形成組成物を用い、上記と同様の方法によって、シリコンウエハー上にレジスト下層膜を形成した。そして、これらのレジスト下層膜のドライエッチング速度を、サムコ(株)製RIEシステムを用い、ドライエッチングガスとしてN2を使用した条件下で測定した。また、フォトレジスト溶液(JSR(株)製、商品名:V146G)を、スピナーにより、シリコンウエハー上に塗布し、得られた塗布膜をホットプレート上で110℃の温度で1分間ベークし、フォトレジスト膜を形成した。このフォトレジスト膜のドライエッチング速度を、上記サムコ(株)製RIEシステムを用い、ドライエッチングガスとしてN2を使用した条件下で測定した。前記フォトレジスト膜のドライエッチング速度を1.00としたときの、前記各レジスト下層膜のドライエッチング速度を“選択比”として算出した。ドライエッチングを用いて良好に加工するためには、選択比が1.5以上であることが望ましい。下記表1に結果を示す。
実施例1乃至3、比較例1で調製したレジスト下層膜形成用組成物を、それぞれ、スピナーにより、シリコンウエハー上に塗布した。その後、得られた塗布膜をホットプレート上で215℃にて1分間ベークし、膜厚0.2μmのレジスト下層膜を形成した。このレジスト下層膜の上に、市販のフォトレジスト溶液(信越化学工業(株)製、商品名:AR2772)をスピナーにより塗布し、得られた塗布膜をホットプレート上で110℃にて60秒間ベークして、フォトレジスト膜(膜厚0.20μm)を形成した。
(株)ニコン製スキャナー、NSRS307E(波長193nm、NA:0.85,σ:0.62/0.93(ANNULAR))を用い、現像後にフォトレジストのライン幅及びそのフォトレジストのライン間の幅が0.10μmであり、すなわち0.10μmL/S(デンスライン)であって、そのようなラインが100本形成されるように設定されたフォトマスクを通して露光を行った。その後、得られた露光済みの膜に、ホットプレート上、110℃で60秒間露光後加熱(PEB)を行い、冷却後、工業規格の60秒シングルパドル式工程にて、現像液として0.26規定の水酸化テトラメチルアンモニウム水溶液を用いて現像し、フォトレジストパターンを得た。得られたフォトレジストパターンについて、基板すなわちシリコンウエハーと垂直方向の断面を、走査型電子顕微鏡(SEM)で観察した。フォトレジストが基板に形成されており、且つ良好なストレートの裾形状のサンプルを○、そうではないサンプルを×とした。結果を表1に、フォトレジストパターンの断面を撮影したSEM像を、図1にそれぞれ示す。
実施例1乃至3、比較例1で調製されたレジスト下層膜形成組成物を、それぞれ、スピナーにより、トレンチ(幅0.01μm、深さ0.23μm)を複数有し、SiO2膜が表面に形成されたシリコンウエハー(以下、本明細書ではSiO2ウエハーと略称する。)上に塗布した。その後、得られた塗布膜をホットプレート上で215℃の温度で1分間ベークし、レジスト下層膜(膜厚0.2μm)を形成した。
Claims (6)
- エポキシ基を含む樹脂(A)と、チオール基を有する化合物(B)を反応させて得られる樹脂を含む、レジスト下層膜形成組成物。
- 前記エポキシ基を含む樹脂(A)がフェノールノボラック型エポキシ樹脂である、請求項2に記載のレジスト下層膜形成組成物。
- 請求項1から3の何れか1項に記載のレジスト下層膜形成組成物からなる塗布膜の焼成物であることを特徴とするレジスト下層膜。
- 請求項1から3の何れか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て塗布膜を形成し、その塗布膜を焼成してレジスト下層膜を形成する工程を含み、半導体の製造に用いることを特徴とす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から3の何れか1項に記載のレジスト下層膜形成組成物からなる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、
レジスト膜に対する光又は電子線の照射とその後の現像によりレジストパターンを形成する工程と、
形成された前記レジストパターンを介して前記レジスト下層膜をエッチングすることによりパターン化されたレジスト下層膜を形成する工程と、
パターン化された前記レジスト下層膜により半導体基板を加工する工程と、
を含むことを特徴とする、半導体装置の製造方法。
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US16/646,987 US11635692B2 (en) | 2017-09-22 | 2018-09-19 | Resist underlying film forming composition |
JP2019543660A JP7255487B2 (ja) | 2017-09-22 | 2018-09-19 | レジスト下層膜形成組成物 |
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KR20230024915A (ko) | 2020-06-12 | 2023-02-21 | 닛산 가가쿠 가부시키가이샤 | 디올구조를 포함하는 보호막 형성용 조성물 |
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CN111108441A (zh) | 2020-05-05 |
US11635692B2 (en) | 2023-04-25 |
TWI782093B (zh) | 2022-11-01 |
TW201922835A (zh) | 2019-06-16 |
CN111108441B (zh) | 2023-11-07 |
KR102643360B1 (ko) | 2024-03-07 |
KR20200054211A (ko) | 2020-05-19 |
US20200209753A1 (en) | 2020-07-02 |
JPWO2019059210A1 (ja) | 2020-11-19 |
JP7255487B2 (ja) | 2023-04-11 |
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