WO2016088515A1 - レジスト下層膜形成用感光性組成物及びレジスト下層膜 - Google Patents
レジスト下層膜形成用感光性組成物及びレジスト下層膜 Download PDFInfo
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- WO2016088515A1 WO2016088515A1 PCT/JP2015/081572 JP2015081572W WO2016088515A1 WO 2016088515 A1 WO2016088515 A1 WO 2016088515A1 JP 2015081572 W JP2015081572 W JP 2015081572W WO 2016088515 A1 WO2016088515 A1 WO 2016088515A1
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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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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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- 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
- G03F7/022—Quinonediazides
- G03F7/023—Macromolecular quinonediazides; Macromolecular additives, e.g. binders
- G03F7/0233—Macromolecular quinonediazides; Macromolecular additives, e.g. binders characterised by the polymeric binders or the macromolecular additives other than the macromolecular quinonediazides
- G03F7/0236—Condensation products of carbonyl compounds and phenolic compounds, e.g. novolak resins
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C39/00—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring
- C07C39/12—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring polycyclic with no unsaturation outside the aromatic rings
- C07C39/15—Compounds having at least one hydroxy or O-metal group bound to a carbon atom of a six-membered aromatic ring polycyclic with no unsaturation outside the aromatic rings with all hydroxy groups on non-condensed rings, e.g. phenylphenol
- C07C39/16—Bis-(hydroxyphenyl) alkanes; Tris-(hydroxyphenyl)alkanes
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
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- 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
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
- C08G8/10—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ with phenol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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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
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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
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
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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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
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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
- G03F7/091—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers characterised by antireflection means or light filtering or absorbing means, e.g. anti-halation, contrast enhancement
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/094—Multilayer resist systems, e.g. planarising layers
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- 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
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- H10P76/00—
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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
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/46—NMR spectroscopy
Definitions
- the present invention relates to a photosensitive underlayer film-forming photosensitive composition that is excellent in dry etching resistance and heat resistance, and whose alkali solubility can be easily controlled, and a resist underlayer film obtained using the composition.
- a multilayer resist method In the field of photoresist, various methods for forming finer wiring patterns have been developed, and one of them is a multilayer resist method.
- the multilayer resist method one or more layers called resist underlayer films are formed on a substrate, then a resist pattern is formed on the substrate by ordinary photolithography, and then a wiring pattern is processed on the substrate by dry etching. Transcript.
- One of the important members in the multilayer resist method is the resist underlayer film, and the underlayer film has high dry etching resistance, low resist pattern line edge roughness (LER), low light reflectivity, and thermal decomposition resistance. It is required to be expensive.
- the resin material for the resist underlayer film needs to be soluble in a general-purpose organic solvent, and, depending on the mode of resist pattern formation,
- the resin composition before curing is soluble in an alkali developing solution and is required to be capable of being removed simultaneously with development of a photoresist.
- a composition containing a novolak resin having a fluorene skeleton and a phenolic hydroxyl group is known (see, for example, Patent Document 1).
- the novolak resin having a fluorene skeleton and a phenolic hydroxyl group described in Patent Document 1 is excellent in solubility in a general-purpose organic solvent, and a cured coating film obtained using a resin composition containing this resin is light. There is an advantage of low reflectance. However, the cured coating film is still insufficient in dry etching resistance and heat resistance.
- the problem to be solved by the present invention is from a photosensitive underlayer film forming photosensitive composition that is excellent in dry etching resistance and heat resistance, and whose alkali solubility is easily controlled, and the resist underlayer film forming photosensitive composition.
- An object of the present invention is to provide a resist underlayer film.
- the present inventor has a novolak type phenolic resin obtained by condensing a phenolic trinuclear compound and aldehydes, and has high dry etching resistance and heat resistance.
- a phenolic trinuclear compound a trinuclear compound comprising a trinuclear compound having a phenolic hydroxyl group in all three benzene rings, two benzene rings having a phenolic hydroxyl group, and a benzene ring having no phenolic hydroxyl group.
- the present invention has been completed by finding that, by using in combination with a body compound, the amount of hydroxyl group of the resulting novolak-type phenolic resin can be controlled and desired alkali solubility can be realized.
- R 1 , R 2 , and R 3 each independently represents an alkyl group having 1 to 8 carbon atoms which may have a substituent.
- R 1 When a plurality of R 1 are present, they may be the same or different.
- R 2 When a plurality of R 2 are present, they may be the same or different.
- R 3 When a plurality of R 3 are present, May be the same or different.
- p and q are each independently an integer of 1 to 4
- r is an integer of 0 to 4
- s is 1 or 2. However, the sum of r and s is 5 or less.
- a novolak-type phenol resin obtained by reacting at least one phenol trinuclear compound (A) selected from the group consisting of compounds represented by the formula (A) and an aldehyde (B) under an acid catalyst.
- the present invention relates to a photosensitive underlayer film forming photosensitive composition.
- the present invention also relates to a resist underlayer film obtained by curing the photosensitive composition for forming a resist underlayer film.
- the photosensitive composition for forming a resist underlayer film according to the present invention By using the photosensitive composition for forming a resist underlayer film according to the present invention, a resist underlayer film having high dry etching resistance and high heat resistance and easy control of alkali solubility can be obtained. Moreover, since the photosensitive composition for resist underlayer film formation which concerns on this invention contains resin which has many benzene rings as a novolak-type phenol resin, the coating film obtained has low light reflectivity. Therefore, the photosensitive composition for forming a resist underlayer film according to the present invention can be suitably used for forming an antireflection film.
- FIG. 2 is a GPC chart of a phenol trinuclear compound (1) obtained in Synthesis Example 1.
- 3 is a 13 C-NMR spectrum chart of the phenolic trinuclear compound (1) obtained in Synthesis Example 1.
- FIG. 6 is a GPC chart of a phenol trinuclear compound (2) obtained in Synthesis Example 2.
- 3 is a chart of 13 C-NMR spectrum of a phenolic trinuclear compound (2) obtained in Synthesis Example 2.
- 6 is a GPC chart of a novolak resin (3-a) obtained in Synthesis Example 3.
- 6 is a GPC chart of a novolak resin (3-b) obtained in Synthesis Example 4.
- 10 is a GPC chart of a novolak resin (3-c) obtained in Synthesis Example 5.
- 10 is a GPC chart of a novolak resin (3-d) obtained in Synthesis Example 6.
- the photosensitive underlayer film forming photosensitive composition according to the present invention comprises at least one phenol selected from the group consisting of a compound represented by the following general formula (1) and a compound represented by the following general formula (2). It contains a novolac-type phenol resin obtained by reacting a system trinuclear compound (A) and an aldehyde (B) in the presence of an acid catalyst.
- the novolak-type phenol resin As the phenol-based trinuclear compound (A) used as a raw material for the novolak-type phenol resin (hereinafter sometimes referred to as “the novolak-type phenol resin according to the present invention”), a compound represented by the general formula (1) ( A trinuclear compound having a phenolic hydroxyl group on all three benzene rings) and a compound represented by the general formula (2) (two benzene rings having a phenolic hydroxyl group and a benzene ring having no phenolic hydroxyl group) In combination with an appropriate ratio, the amount of hydroxyl groups of the resulting novolak-type phenol resin can be controlled, and the alkali solubility can be easily controlled to a desired level.
- the general formula (1) A trinuclear compound having a phenolic hydroxyl group on all three benzene rings
- a compound represented by the general formula (2) two benzene rings having a phenolic hydroxyl group
- p and q are each independently an integer of 1 to 4
- r is an integer of 0 to 4
- s is 1 or 2.
- the sum of r and s is 5 or less.
- t is an integer of 0 to 5.
- R 1 , R 2 , and R 3 each independently represents an alkyl group having 1 to 8 carbon atoms that may have a substituent.
- R 1 When a plurality of R 1 are present, they may be the same or different.
- R 2 When a plurality of R 2 are present, they may be the same or different.
- R 3 When a plurality of R 3 are present, May be the same or different.
- the alkyl group may be linear, branched, or a group having a cyclic structure, but is preferably a linear group.
- the alkyl group of R 1 , R 2 , or R 3 is preferably an alkyl group having 1 to 6 carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms, and linear carbon More preferred is an alkyl group having 1 to 3 atoms.
- the hydrogen atom in the alkyl group of R 1 , R 2 , or R 3 in the general formulas (1) and (2) may be substituted with a substituent.
- the number of hydrogen atoms that can be substituted is not particularly limited, but is preferably 1 to 3, more preferably 1 or 2.
- each substituent may be the same as or different from each other.
- substituents examples include a hydroxyl group, an alkoxy group having 1 to 6 carbon atoms, an aryl group which may have a substituent, and a halogen atom.
- substituents of the alkyl group examples include a methoxy group, an ethoxy group, a propoxy group, an n-butyloxy group, a t-butyloxy group, a pentyloxy group, and an isoamyloxy group. Hexyloxy group, cyclohexyloxy group and the like.
- examples of the aryl group which may have a substituent include a phenyl group, a naphthyl group, an indenyl group, and a biphenyl group.
- examples of the halogen atom include a fluorine atom, a chlorine atom, and a bromine atom.
- alkyl group represented by R 1 , R 2 , and R 3 in the general formulas (1) and (2) include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, and an isobutyl group.
- T-butyl group pentyl group, isoamyl group, hexyl group, cyclohexyl group, hydroxyethyl group, hydroxypropyl group, fluoromethyl group, methoxyethyl group, ethoxyethyl group, methoxypropyl group, phenylmethyl group, hydroxyphenyl Methyl group, dihydroxyphenylmethyl group, tolylmethyl group, xylylmethyl group, naphthylmethyl group, hydroxynaphthylmethyl group, dihydroxynaphthylmethyl group, phenylethyl group, hydroxyphenylethyl group, dihydroxyphenylethyl group, tolylethyl group, xylylethyl group, naphthylethyl group Group, hydro And naphthylethyl group and dihydroxynaphthylethyl group.
- Methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, pentyl group, isoamyl group and hexyl group are preferable.
- Group or ethyl group is more preferable, and methyl group is still more preferable.
- R 1 and R 2 in general formulas (1) and (2) are preferably alkyl groups having the same number of carbon atoms. Further, each of R 1 and R 2 are, in the benzene ring of each R 1 and R 2 are bonded, attached to the carbon atom in the same position when viewed from the carbon atom to which phenolic hydroxyl group such as benzene ring has is attached It is preferable. A phenolic hydroxyl group is bonded to each of the benzene ring to which R 1 is bonded and the benzene ring to which R 2 is bonded. The position at which this phenolic hydroxyl group is bonded is also the same in each benzene ring. preferable. Furthermore, p and q are preferably the same number. As p and q, 2 is preferable.
- R in the general formulas (1) and (2) is an integer of 0 to 4. Among these, r is preferably 0.
- Examples of the compound represented by the general formula (1) include compounds represented by any one of the following general formulas (1-1) to (1-18).
- R 1 , R 2 , and R 3 are the same as those in the general formula (1), r1 represents an integer of 0 to 4, and r2 is 0 Represents an integer of ⁇ 3.
- the general formula (1-1) to the compound represented by the formula (1-18), Compound R 1 and R 2 are both methyl or ethyl group, and r1 and r2 is 0
- R 1 R 2 and R 2 are both methyl groups, and r1 and r2 are 0.
- the general formulas (1-1), ( The compound represented by 1-2), (1-7), (1-8), (1-13), or (1-14) is preferred, and is represented by the general formulas (1-1), (1-7) Or a compound represented by (1-13) is more preferred, and a compound represented by formula (1-1) is more preferred.
- Examples of the compound represented by the general formula (2) include compounds represented by any one of the following general formulas (2-1) to (2-6).
- R 1 , R 2 , R 3 , and t are the same as those in the general formula (2).
- the general formula (2-1) to the compound represented by the formula (2-6) compound R 1 and R 2 are both methyl or ethyl group, and t is 0 are preferred, R 1 and R A compound in which both 2 are methyl groups and t is 0 is more preferable.
- the general formula (2-1) or ( The compound represented by 2-2) is preferable, and the compound represented by the general formula (2-1) is more preferable.
- the compound represented by the general formula (1) includes, for example, an alkyl-substituted phenol (c1) and a hydroxyl group-containing aromatic aldehyde (c2), and the number of carbon atoms on the aromatic hydrocarbon group of the alkyl-substituted phenol (c1). It can be obtained by carrying out the condensation under conditions where the difference in reaction activity energy can be utilized. Specifically, for example, the compound represented by the general formula (1) is obtained by polycondensing an alkyl-substituted phenol (c1) and a hydroxyl group-containing aromatic aldehyde (c2) in the presence of an acid catalyst. .
- the compound represented by the general formula (2) is, for example, alkyl-substituted phenol (c1) and aromatic aldehyde having no hydroxyl group (hydroxyl-free aromatic aldehyde) (c′2) It can be obtained by performing condensation under conditions that can utilize the difference in the reaction activity energy of carbon atoms on the aromatic hydrocarbon group of phenol (c1).
- the compound represented by the general formula (1) is obtained by polycondensing an alkyl-substituted phenol (c1) and a hydroxyl group-free aromatic aldehyde (c′2) in the presence of an acid catalyst. Is obtained.
- the alkyl-substituted phenol (c1) is a compound in which part or all of the hydrogen atoms bonded to the phenol benzene ring are substituted with an alkyl group.
- alkyl group include alkyl groups having 1 to 8 carbon atoms, and a methyl group is particularly preferable.
- alkyl-substituted phenol (c1) examples include o-cresol, m-cresol, p-cresol, o-ethylphenol, m-ethylphenol, p-ethylphenol, p-octylphenol, pt-butylphenol, o Monoalkylphenols such as cyclohexylphenol, m-cyclohexylphenol, p-cyclohexylphenol; dialkyl such as 2,5-xylenol, 3,5-xylenol, 3,4-xylenol, 2,4-xylenol, 2,6-xylenol Examples include alkylphenols; trialkylphenols such as 2,3,5-trimethylphenol and 2,3,6-trimethylphenol.
- alkyl-substituted phenols those having a substitution number of alkyl groups on the benzene ring of phenol of 2 are preferable because of excellent balance between heat resistance and alkali solubility. Specific examples include 2,5- Xylenol and 2,6-xylenol are preferred. These alkyl-substituted phenols (c1) can be used alone or in combination of two or more, but preferably only one is used.
- the hydroxyl group-containing aromatic aldehyde (c2) is a compound having at least one aldehyde group and at least one hydroxyl group in the aromatic ring.
- the hydroxyl group-containing aromatic aldehyde (c2) include hydroxybenzaldehyde such as salicylaldehyde, m-hydroxybenzaldehyde and p-hydroxybenzaldehyde; dihydroxybenzaldehyde such as 2,4-dihydroxybenzaldehyde and 3,4-dihydroxybenzaldehyde; vanillin And vanillin compounds such as ortho vanillin, isovanillin and ethyl vanillin;
- p-hydroxybenzaldehyde (4-hydroxybenzaldehyde) and 2,4-dihydroxybenzaldehyde are excellent because they are easily available industrially and have a good balance between heat resistance and alkali solubility.
- the hydroxyl group-free aromatic aldehyde (c′2) is a compound having at least one aldehyde group in the aromatic ring and not having a phenolic hydroxyl group.
- the hydroxyl group-free aromatic aldehyde (c′2) include benzaldehyde; alkylbenzaldehyde such as methylbenzaldehyde, ethylbenzaldehyde, dimethylbenzaldehyde, and diethylbenzaldehyde; alkoxybenzaldehyde such as methoxybenzaldehyde and ethoxybenzaldehyde; Of these hydroxyl group-free aromatic aldehydes (c′2), benzaldehyde is preferred.
- the compound represented by the general formula (1) or (2) includes, for example, the alkyl-substituted phenol (c1), the hydroxyl group-containing aromatic aldehyde (c2) or the hydroxyl group-free aromatic aldehyde (c′2), Can be obtained by polycondensation in the presence of an acid catalyst.
- an acid catalyst for example, by polycondensation of 2,5-xylenol and 4-hydroxybenzaldehyde in the presence of an acid catalyst, R 1 and R 2 in the general formula (1-1) are both methyl groups, and r A compound is obtained in which is 0.
- R 1 and R 2 are both methyl groups, and r is 0 Is obtained.
- the acid catalyst examples include acetic acid, oxalic acid, sulfuric acid, hydrochloric acid, phenolsulfonic acid, paratoluenesulfonic acid, zinc acetate, manganese acetate and the like. These acid catalysts can be used alone or in combination of two or more. Of these acid catalysts, sulfuric acid and paratoluenesulfonic acid are preferred because of their excellent activity.
- the acid catalyst may be added before the reaction or may be added during the reaction.
- the polycondensation of the alkyl-substituted phenol (c1) and the hydroxyl group-containing aromatic aldehyde (c2) or the hydroxyl group-free aromatic aldehyde (c′2) may be carried out in the presence of an organic solvent, if necessary. .
- organic solvent examples include monoalcohols such as methanol, ethanol, and propanol; ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, , 6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, trimethylene glycol, diethylene glycol, polyethylene glycol, glycerin and other polyols; 2-ethoxyethanol, ethylene glycol monomethyl ether , Ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monopentyl ether, ethylene glycol dimethyl ether, ethylene Glycol ethers such as glycol ethyl methyl ether and ethylene glycol monophenyl ether
- the reaction temperature for polycondensing the alkyl-substituted phenol (c1) with the hydroxyl group-containing aromatic aldehyde (c2) or the hydroxyl group-free aromatic aldehyde (c′2) is, for example, 60 to 140 ° C.
- the reaction time is, for example, 0.5 to 100 hours.
- the charge ratio [(c1) / (c2)] is excellent in the removability of the unreacted alkyl-substituted phenol (c1), the yield of the product and the purity of the reaction product.
- the ratio is preferably in the range of 1 / 0.2 to 1 / 0.5, more preferably in the range of 1 / 0.25 to 1 / 0.45.
- the general formula (1) In the reaction solution of the polycondensation of the alkyl-substituted phenol (c1) and the hydroxyl group-containing aromatic aldehyde (c2) or the hydroxyl group-free aromatic aldehyde (c′2), the general formula (1) ) Or (2) and the unreacted substance may remain. Moreover, an unfavorable condensate other than the compound represented by the general formula (1) or (2) may be generated. Therefore, before being used as a raw material for the novolak-type phenol resin according to the present invention (phenolic trinuclear compound (A)), it is represented by the general formula (1) or (2) from the reaction solution after the polycondensation reaction. It is preferable to purify the compound.
- the purity of the compound represented by the general formula (1) or (2) used as the phenol trinuclear compound (A) is preferably 85% or more, more preferably 90% or more, still more preferably 94% or more, 98% or more is particularly preferable.
- the purity of the compound represented by the general formula (1) or (2) can be determined from the area ratio in the GPC chart.
- the reaction solution after the polycondensation reaction is converted to the compound represented by the general formula (1) or (2).
- the poor solvent (S1) which is insoluble or hardly soluble, and the resulting precipitate is dissolved in the compound represented by the general formula (1) or (2)
- there is a method in which the precipitate generated by dissolving in the solvent (S2) that is also mixed with the poor solvent (S1) and throwing again into the poor solvent (S1) is filtered.
- Examples of the poor solvent (S1) used in this case include water; monoalcohols such as methanol, ethanol, and propanol; aliphatic hydrocarbons such as n-hexane, n-heptane, n-octane, and cyclohyxane; toluene, xylene And aromatic hydrocarbons.
- water and methanol are preferable because the acid catalyst can be efficiently removed at the same time.
- examples of the solvent (S2) include monoalcohols such as methanol, ethanol, and propanol; ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5- Polyols such as pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, trimethylene glycol, diethylene glycol, polyethylene glycol, glycerin; 2-ethoxyethanol, Ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monopentyl ether, ethylene glycol dimethyl ether Glycol ethers such as ethylene glycol ethyl methyl ether and ethylene glycol mono
- one or more compounds represented by the general formula (1) may be used as the phenolic trinuclear compound (A).
- Two or more kinds of compounds represented by the general formula (2) may be used, and one kind or two or more kinds of compounds represented by the general formula (1) and one kind or two or more kinds of the general formula (2). You may use the compound represented by these.
- the phenolic trinuclear compound (A) by adjusting the ratio of the compound represented by the general formula (1) and the compound represented by the general formula (2), the resulting novolak-type phenol resin has a hydroxyl group. The amount can be adjusted.
- aldehyde (B) used as a raw material of the novolak type phenol resin according to the present invention for example, a compound represented by the following general formula (3) can be used.
- R 4 represents a hydrogen atom, an alkyl group that may have a substituent, or an aryl group that may have a substituent.
- the aldehydes (B) used as a raw material may be one type of compound or a combination of two or more types of compounds.
- alkyl aldehydes such as acetaldehyde, propyl aldehyde, butyraldehyde, isobutyraldehyde, pentyl aldehyde, hexyl aldehyde; salicyl aldehyde, 3-hydroxybenzaldehyde, 4-hydroxybenzaldehyde 2-hydroxy-4-methylbenzaldehyde, 2,4-dihydroxybenzaldehyde, 3,4-dihydroxybenzaldehyde and the like; 2-hydroxy-3-methoxybenzaldehyde, 3-hydroxy-4-methoxybenzaldehyde, 4-hydroxy- 3-methoxybenzaldehyde, 3-ethoxy-4-hydroxybenzaldehyde, 4-hydroxy-3,5-dimethoxybenzalde A benzaldehyde having both a hydroxy group and an alkoxy group such as alkoxide; an alkoxybenzaldeh
- formaldehyde When formaldehyde is used as the aldehyde (B), formaldehyde and other aldehydes may be used in combination. When formaldehyde and other aldehydes are used in combination, the amount of other aldehydes used is preferably in the range of 0.05 to 1 mole per mole of formaldehyde.
- the novolak-type phenol resin according to the present invention can be obtained, for example, by condensing a phenol trinuclear compound (A) and an aldehyde (B) in the presence of an acid catalyst.
- the charge ratio [(A) / (B)] of the phenolic trinuclear compound (A) and the aldehydes (B) can suppress excessive high molecular weight (gelation), and phenol for forming a resist underlayer film. Since a resin having an appropriate molecular weight can be obtained, the molar ratio is preferably in the range of 1 / 0.5 to 1 / 1.2, and more preferably in the range of 1 / 0.6 to 1 / 0.9.
- Acid catalysts used in the reaction include inorganic acids such as sulfuric acid, hydrochloric acid, nitric acid, hydrobromic acid, perchloric acid and phosphoric acid, sulfonic acids such as p-toluenesulfonic acid, methanesulfonic acid and benzenesulfonic acid, and oxalic acid And organic acids such as succinic acid, malonic acid, monochloroacetic acid and dichloroacetic acid, and Lewis acids such as boron trifluoride, anhydrous aluminum chloride and zinc chloride.
- inorganic acids such as sulfuric acid, hydrochloric acid, nitric acid, hydrobromic acid, perchloric acid and phosphoric acid
- sulfonic acids such as p-toluenesulfonic acid, methanesulfonic acid and benzenesulfonic acid
- oxalic acid and organic acids
- organic acids such as succinic acid, malonic acid,
- sulfuric acid or p-toluenesulfonic acid is preferred because it exhibits strong acidity and promotes the reaction between the phenolic trinuclear compound (A) and the aldehydes (B) with high activity.
- the amount of these acid catalysts used is preferably in the range of 0.1 to 25% by mass relative to the total mass of the reaction raw materials.
- the condensation reaction between the phenolic trinuclear compound (A) and the aldehydes (B) may be performed in the presence of an organic solvent as necessary.
- the organic solvent include the same organic solvents that can be used in the polycondensation of the alkyl-substituted phenol (c1) and the hydroxyl group-containing aromatic aldehyde (c2).
- the organic solvent can be used alone or in combination of two or more. Further, 2-ethoxyethanol is preferred as the organic solvent from the viewpoint of excellent solubility of the resulting novolak type phenol resin.
- Examples of the novolak-type phenolic resin according to the present invention include, as repeating units, a structural unit (I-1) represented by the following general formula (I-1) and a structure represented by the following general formula (I-2). Group consisting of unit (I-2), structural unit (II-1) represented by the following general formula (II-1), and structural unit (II-2) represented by the following general formula (II-2) What has 1 or more types of structural site
- R 1 and R 2 are the same as those in the general formula (1), and R 4 is It is the same as the general formula (3).
- R 1 and R 2 are both the same group, and R 4 is preferably a hydrogen atom, R 1 and R 2 are both the same unsubstituted alkyl group having 1 to 3 carbon atoms, and R 4 is more preferably a hydrogen atom, and R 1 and More preferably, both R 2 are methyl groups and R 4 is a hydrogen atom.
- the weight average molecular weight of the novolak type phenolic resin according to the present invention is preferably 1,000 to 100,000, more preferably 1,000 to 70,000, and still more preferably 1,000 to 35,000.
- the molecular weight of the novolak type phenol resin having the structural unit represented by the general formula (I-1) or the structural unit represented by the general formula (II-1) as a repeating unit is determined by dry etching resistance and heat resistance.
- 5,000 to 100,000 is preferable, 5,000 to 70,000 is more preferable, and 5,000 to 35 is preferable because a photosensitive composition for forming a resist underlayer film excellent in resistance is obtained. Is more preferable, and 7,000 to 25,000 is particularly preferable.
- the molecular weight of the novolac type phenol resin having the structural unit represented by the general formula (I-2) or the structural unit represented by the general formula (II-2) as a repeating unit is determined by dry etching resistance and heat resistance. 1,000 to 5,000 are preferable in terms of weight average molecular weight (Mw), and 2,000 to 4,000 are more preferable.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the novolak type phenol resin are measured by gel permeation chromatography (hereinafter abbreviated as “GPC”) as follows. It is measured under conditions.
- the novolak type phenol resin according to the present invention has many benzene rings, a coating film excellent in dry etching resistance and heat resistance is formed from the photosensitive underlayer film forming photosensitive composition containing the novolak type phenol resin. be able to. For this reason, the coating film of the resist material which consists of the photosensitive composition for resist underlayer film formation concerning this invention is suitable as an underlayer film.
- the coating film made of the photosensitive composition for forming the resist underlayer film has low light reflectivity because the benzene ring derived from the novolak type phenol resin absorbs light. For this reason, the coating film which consists of the photosensitive composition for resist underlayer film formation concerning this invention is suitable also as an antireflection film.
- the photosensitive composition for forming a resist underlayer film according to the present invention may be used in combination with another alkali-soluble resin in addition to the novolac type phenol resin according to the present invention.
- Any other alkali-soluble resin may be used as long as it is soluble in an alkali developer or can be dissolved in an alkali developer by using an additive such as a photoacid generator. Can also be used.
- alkali-soluble resins used here include, for example, phenolic hydroxyl group-containing resins other than the novolak type phenolic resin according to the present invention, p-hydroxystyrene and p- (1,1,1,3,3,3-hexa).
- Homopolymers or copolymers of hydroxy group-containing styrene compounds such as (fluoro-2-hydroxypropyl) styrene, those having hydroxyl groups modified with acid-decomposable groups such as carbonyl groups and benzyloxycarbonyl groups, (meth) acrylic Examples include an acid homopolymer or copolymer, and an alternating polymer of an alicyclic polymerizable monomer such as a norbornene compound or a tetracyclododecene compound and maleic anhydride or maleimide.
- phenolic hydroxyl group-containing resin other than the novolak-type phenolic resin according to the present invention examples include phenol novolak resin, cresol novolak resin, naphthol novolak resin, co-condensed novolak resin using various phenolic compounds, and aromatic hydrocarbon formaldehyde resin.
- Modified phenolic resin dicyclopentadiene phenol addition resin, phenol aralkyl resin (Zylok resin), naphthol aralkyl resin, trimethylol methane resin, tetraphenylol ethane resin, biphenyl modified phenolic resin (multiple phenol nuclei linked by bismethylene group) Polyphenol compound), biphenyl-modified naphthol resin (polyvalent naphthol compound in which phenol nuclei are linked by bismethylene groups), aminotriazine-modified phenol resin (melami) And phenolic resins such as benzoguanamine and the like, and phenolic compounds such as alkoxy group-containing aromatic ring-modified novolak resins (polyhydric phenolic compounds in which phenolic nuclei and alkoxy group-containing aromatic rings are connected by formaldehyde). It is done.
- a cresol novolak resin or a co-condensed novolak resin of cresol and another phenolic compound is preferable because it is a photosensitive resin composition having excellent heat resistance.
- the cresol novolak resin or the co-condensed novolak resin of cresol and other phenolic compound comprises at least one cresol selected from the group consisting of o-cresol, m-cresol and p-cresol and an aldehyde compound. It is a novolak resin obtained as an essential raw material and appropriately used in combination with other phenolic compounds.
- phenol examples include phenol; xylenol such as 2,3-xylenol, 2,4-xylenol, 2,5-xylenol, 2,6-xylenol, 3,4-xylenol, and 3,5-xylenol.
- Ethylphenols such as o-ethylphenol, m-ethylphenol and p-ethylphenol; butylphenols such as isopropylphenol, butylphenol and pt-butylphenol; p-pentylphenol, p-octylphenol, p-nonylphenol, p-alkyl Alkylphenols such as milphenol; halogenated phenols such as fluorophenol, chlorophenol, bromophenol, and iodophenol; p-phenylphenol, aminophenol, nitrophenol, dinitrophenol Monosubstituted phenols such as trinitrophenol; condensed polycyclic phenols such as 1-naphthol and 2-naphthol; resorcin, alkylresorcin, pyrogallol, catechol, alkylcatechol, hydroquinone, alkylhydroquinone, phloroglucin, bis
- phenolic compounds may be used alone or in combination of two or more.
- the amount used is preferably such that the other phenolic compound is in the range of 0.05 to 1 mol with respect to a total of 1 mol of the cresol raw material.
- aldehyde compound examples include formaldehyde, paraformaldehyde, trioxane, acetaldehyde, propionaldehyde, polyoxymethylene, chloral, hexamethylenetetramine, furfural, glyoxal, n-butyraldehyde, caproaldehyde, allylaldehyde, benzaldehyde, croton.
- formaldehyde is preferable because of its excellent reactivity, and formaldehyde and other aldehyde compounds may be used in combination.
- the amount of the other aldehyde compounds used is preferably in the range of 0.05 to 1 mole per mole of formaldehyde.
- the reaction ratio between the phenolic compound and the aldehyde compound when producing the novolak resin is such that a photosensitive composition having excellent sensitivity and heat resistance can be obtained, so that the aldehyde compound is 0.3 to 1 per mole of the phenolic compound.
- the range is preferably 0.6 mol, and more preferably 0.5 to 1.3.
- the reaction between the phenolic compound and the aldehyde compound is performed in the presence of an acid catalyst at a temperature of 60 to 140 ° C., and then water and residual monomers are removed under reduced pressure.
- an acid catalyst used here include oxalic acid, sulfuric acid, hydrochloric acid, phenolsulfonic acid, p-toluenesulfonic acid, zinc acetate, manganese acetate, etc., and each may be used alone or in combination of two or more. Also good. Of these, oxalic acid is preferred because of its excellent catalytic activity.
- the cresol novolac resin using metacresol alone, or the cresol novolak resin using metacresol and paracresol in combination is a photosensitive resin composition having an excellent balance between sensitivity and heat resistance, so that the ratio is 10/0 to 2/8.
- the range is preferable, and the range of 7/3 to 2/8 is more preferable.
- the blending ratio of the novolac type phenol resin according to the present invention and the other alkali-soluble resin can be arbitrarily adjusted depending on the desired use.
- the novolak-type phenolic resin and other alkali-soluble resins according to the present invention exhibit the effects of the present invention that are excellent in dry etching resistance and heat resistance and that the alkali solubility can be easily controlled.
- the novolak type phenol resin according to the present invention is preferably used in an amount of 60% by mass or more, and more preferably 80% by mass or more.
- the photosensitive composition for forming a resist underlayer film according to the present invention preferably contains an organic solvent together with the novolak type phenol resin according to the present invention, and the solution in which the novolak type phenol resin according to the present invention is dissolved in the organic solvent.
- the organic solvent include ethylene glycol alkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monobutyl ether; diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, diethylene glycol dibutyl ether, and the like.
- Diethylene glycol dialkyl ethers Diethylene glycol dialkyl ethers; ethylene glycol alkyl ether acetates such as methyl cellosolve acetate and ethyl cellosolve acetate; propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, etc.
- esters such as ethyl. These organic solvents can be used alone or in combination of two or more.
- the resist underlayer film forming photosensitive composition according to the present invention preferably contains at least one selected from the group consisting of a photoacid generator and a curing agent together with the novolak type phenol resin according to the present invention.
- a photoacid generator it may contain one kind of photoacid generator, or contain two or more kinds of photoacid generators. May be.
- the photosensitive composition for resist underlayer film formation concerning this invention contains a hardening
- the photoacid generator examples include organic halogen compounds, sulfonic acid esters, onium salts, diazonium salts, disulfone compounds, and the like. Specific examples thereof include, for example, tris (trichloromethyl) -s-triazine, tris (tribromomethyl) -s-triazine, tris (dibromomethyl) -s-triazine, and 2,4-bis (tribromomethyl).
- Haloalkyl group-containing s-triazine derivatives such as -6-p-methoxyphenyl-s-triazine;
- Halogen-substituted paraffinic hydrocarbon compounds such as 1,2,3,4-tetrabromobutane, 1,1,2,2-tetrabromoethane, carbon tetrabromide, iodoform; hexabromocyclohexane, hexachlorocyclohexane, hexabromocyclo Halogen-substituted cycloparaffinic hydrocarbon compounds such as dodecane;
- Halogenated benzene derivatives such as bis (trichloromethyl) benzene and bis (tribromomethyl) benzene; Sulfone compounds containing haloalkyl groups such as tribromomethylphenylsulfone and trichloromethylphenylsulfone; Halogen containing such as 2,3-dibromosulfolane Sulfolane compounds; haloalkyl group-containing isocyanurate compounds such as tris (2,3-dibromopropyl) isocyanurate;
- Sulfonium such as triphenylsulfonium chloride, triphenylsulfonium methanesulfonate, triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium p-toluenesulfonate, triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluoroarsenate, triphenylsulfonium hexafluorophosphonate salt;
- Iodonium salts such as diphenyliodonium trifluoromethanesulfonate, diphenyliodonium p-toluenesulfonate, diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluoroarsenate, diphenyliodonium hexafluorophosphonate;
- o-nitrobenzyl ester compounds such as o-nitrobenzyl-p-toluenesulfonate; sulfone hydrazide compounds such as N, N'-di (phenylsulfonyl) hydrazide, and the like.
- the addition amount of these photoacid generators is a photosensitive composition having high photosensitivity, and therefore it is used in the range of 0.1 to 20 parts by mass with respect to 100 parts by mass of the novolac type phenol resin according to the present invention. preferable.
- the photosensitive underlayer film forming photosensitive composition according to the present invention may contain an organic base compound for neutralizing an acid generated from the photoacid generator during exposure.
- the addition of the organic base compound has an effect of preventing the dimensional variation of the resist pattern due to the movement of the acid generated from the photoacid generator.
- Examples of the organic base compound used here include organic amine compounds selected from nitrogen-containing compounds.
- Pyridine compounds such as pyridine, 4-dimethylaminopyridine, 2,6-dimethylpyridine;
- Amine compounds substituted with a hydroxyalkyl group having 1 to 4 carbon atoms such as diethanolamine, triethanolamine, triisopropanolamine, tris (hydroxymethyl) aminomethane, bis (2-hydroxyethyl) iminotris (hydroxymethyl) methane ;
- Examples thereof include aminophenol compounds such as 2-aminophenol, 3-aminophenol, and 4-aminophenol. These may be used alone or in combination of two or more.
- the pyrimidine compound, the pyridine compound, or the amine compound having a hydroxy group is preferable, and the amine compound having a hydroxy group is particularly preferable because of excellent dimensional stability of the resist pattern after exposure.
- the addition amount is preferably in the range of 0.1 to 100 mol%, preferably in the range of 1 to 50 mol%, with respect to the content of the photoacid generator. Is more preferable.
- Examples of the curing agent that may be contained in the photosensitive underlayer film forming photosensitive composition according to the present invention include melamine substituted with at least one group selected from a methylol group, an alkoxymethyl group, and an acyloxymethyl group.
- Examples thereof include compounds, guanamine compounds, glycoluril compounds, urea compounds, resol resins, epoxy compounds, isocyanate compounds, azide compounds, compounds containing double bonds such as alkenyl ether groups, acid anhydrides, and oxazoline compounds.
- the melamine compound examples include hexamethylol melamine, hexamethoxymethyl melamine, a compound in which 1 to 6 methylol groups of hexamethylol melamine are methoxymethylated, hexamethoxyethyl melamine, hexaacyloxymethyl melamine, hexamethylol melamine Examples thereof include compounds in which 1 to 6 methylol groups are acyloxymethylated.
- guanamine compound examples include tetramethylolguanamine, tetramethoxymethylguanamine, tetramethoxymethylbenzoguanamine, a compound in which 1 to 4 methylol groups of tetramethylolguanamine are methoxymethylated, tetramethoxyethylguanamine, tetraacyloxyguanamine, Examples thereof include compounds in which 1 to 4 methylol groups of tetramethylolguanamine are acyloxymethylated.
- glycoluril compound examples include 1,3,4,6-tetrakis (methoxymethyl) glycoluril, 1,3,4,6-tetrakis (butoxymethyl) glycoluril, 1,3,4,6-tetrakis. (Hydroxymethyl) glycoluril and the like.
- urea compound examples include 1,3-bis (hydroxymethyl) urea, 1,1,3,3-tetrakis (butoxymethyl) urea and 1,1,3,3-tetrakis (methoxymethyl) urea. Can be mentioned.
- resole resins examples include phenols, alkylphenols such as cresol and xylenol, bisphenols such as phenylphenol, resorcinol, biphenyl, bisphenol A and bisphenol F, phenolic hydroxyl group-containing compounds such as naphthol and dihydroxynaphthalene, and aldehyde compounds.
- alkylphenols such as cresol and xylenol
- bisphenols such as phenylphenol, resorcinol, biphenyl, bisphenol A and bisphenol F
- phenolic hydroxyl group-containing compounds such as naphthol and dihydroxynaphthalene
- aldehyde compounds examples include polymers obtained by reacting under alkaline catalyst conditions.
- epoxy compound examples include tris (2,3-epoxypropyl) isocyanurate, trimethylolmethane triglycidyl ether, trimethylolpropane triglycidyl ether, triethylolethane triglycidyl ether, and the like.
- isocyanate compound examples include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and cyclohexane diisocyanate.
- azide compound examples include 1,1′-biphenyl-4,4′-bisazide, 4,4′-methylidenebisazide, 4,4′-oxybisazide, and the like.
- Examples of the compound containing a double bond such as an alkenyl ether group include ethylene glycol divinyl ether, triethylene glycol divinyl ether, 1,2-propanediol divinyl ether, 1,4-butanediol divinyl ether, and tetramethylene glycol divinyl ether.
- Vinyl ether neopentyl glycol divinyl ether, trimethylolpropane trivinyl ether, hexanediol divinyl ether, 1,4-cyclohexanediol divinyl ether, pentaerythritol trivinyl ether, pentaerythritol tetravinyl ether, sorbitol tetravinyl ether, sorbitol pentavinyl ether, trimethylolpropane tri Examples include vinyl ether.
- the acid anhydride examples include phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, 3,3 ′, 4,4′-benzophenonetetracarboxylic dianhydride, biphenyltetracarboxylic dianhydride, 4 , 4 ′-(isopropylidene) diphthalic anhydride, aromatic aromatic anhydrides such as 4,4 ′-(hexafluoroisopropylidene) diphthalic anhydride; tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, hexahydro anhydride Examples thereof include alicyclic carboxylic acid anhydrides such as phthalic acid, methylhexahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride dodecenyl succinic anhydride, and trialkyltetrahydrophthalic anhydride.
- a glycoluril compound, a urea compound, and a resole resin are preferable because the composition is excellent in curability and has excellent dry etching resistance and thermal decomposition resistance when used for resist underlayer film applications. Is particularly preferred.
- the blending amount of the curing agent is 0.1 to 100 parts by mass with respect to 100 parts by mass of the novolak type phenol resin according to the present invention.
- the ratio is preferably 50 parts by mass, more preferably 0.1 to 30 parts by mass, and even more preferably 0.5 to 20 parts by mass.
- the photosensitive composition for forming a resist underlayer film according to the present invention may further contain a photosensitive agent used for a normal resist material.
- the photosensitizer used here include compounds having a quinonediazide group.
- Specific examples of the compound having a quinonediazide group include, for example, an aromatic (poly) hydroxy compound, naphthoquinone-1,2-diazide-5-sulfonic acid, naphthoquinone-1,2-diazide-4-sulfonic acid, orthoanthra
- Examples thereof include complete ester compounds, partial ester compounds, amidated products, and partially amidated products with sulfonic acids having a quinonediazide group such as quinonediazidesulfonic acid.
- aromatic (poly) hydroxy compound used here examples include 2,3,4-trihydroxybenzophenone, 2,4,4′-trihydroxybenzophenone, 2,4,6-trihydroxybenzophenone, 2,3,4, 6-trihydroxybenzophenone, 2,3,4-trihydroxy-2′-methylbenzophenone, 2,3,4,4′-tetrahydroxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, 2, 3 ′, 4,4 ′, 6-pentahydroxybenzophenone, 2,2 ′, 3,4,4′-pentahydroxybenzophenone, 2,2 ′, 3,4,5-pentahydroxybenzophenone, 2,3 ′, 4,4 ′, 5 ′, 6-hexahydroxybenzophenone, 2,3,3 ′, 4,4 ′, 5′-hexahydroxyben Polyhydroxy benzophenone compounds such phenone;
- a tris (hydroxyphenyl) methane compound such as phenyl) -3,4-dihydroxyphenylmethane, bis (4-hydroxy-3,5-dimethylphenyl) -3,4-dihydroxyphenylmethane, or a methyl-substituted product thereof;
- the blending amount thereof is a composition having excellent photosensitivity, and therefore 5 to 50 masses with respect to 100 mass parts of resin solid content in the photosensitive underlayer film forming photosensitive composition according to the present invention. It is preferable to use within the range of parts.
- the photosensitive composition for forming a resist underlayer film according to the present invention may contain a surfactant for the purpose of improving the film forming property and pattern adhesion, and reducing development defects.
- a surfactant for the purpose of improving the film forming property and pattern adhesion, and reducing development defects.
- the surfactant used here include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ether compounds such as polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, polyoxyethylene Polyoxyethylene alkyl allyl ether compounds such as ethylene nonylphenol ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate Sorbitan fatty acid ester compounds such as polyoxy
- the blending amount of these surfactants is preferably in the range of 0.001 to 2 parts by mass with respect to 100 parts by mass of the resin solid content in the photosensitive underlayer film forming photosensitive composition according to the present invention.
- the photosensitive composition for forming a resist underlayer film according to the present invention may further contain a filler.
- the filler can improve the hardness and heat resistance of the coating film.
- the filler contained in the photosensitive composition for forming a resist underlayer film according to the present invention may be an organic filler, but an inorganic filler is preferred.
- inorganic fillers include silica, mica, talc, clay, bentonite, montmorillonite, kaolinite, wollastonite, calcium carbonate, calcium hydroxide, magnesium carbonate, titanium oxide, alumina, aluminum hydroxide, barium sulfate, and titanium.
- Examples thereof include barium acid, potassium titanate, zinc oxide, and glass fiber. Among them, it is preferable to use silica because the coefficient of thermal expansion can be lowered.
- the photosensitive underlayer film forming photosensitive composition according to the present invention if necessary, other resins, photoacid generators, curing agents, photosensitive agents, surfactants, It is preferable that various additives such as a filler, a curing agent, an organic base compound, a dye, a pigment, a curing agent, and a dissolution accelerator are dissolved or dispersed in an organic solvent.
- a coating film can be formed by applying a material dissolved in an organic solvent to a substrate or the like. Dyes, pigments, and dissolution accelerators can be appropriately selected from those widely used as additives for resist materials in consideration of the application to be used.
- the photosensitive underlayer film forming photosensitive composition according to the present invention can be prepared by blending the above-described components and mixing them using a stirrer or the like. Moreover, when the photosensitive composition for resist underlayer film formation contains a filler and a pigment, it can adjust by disperse
- the photosensitive underlayer film forming photosensitive composition according to the present invention may be used as a resist material.
- the resist underlayer film forming photosensitive composition according to the present invention may be used as a resist solution as it is in a state dissolved or dispersed in an organic solvent, or as a film in a state dissolved or dispersed in an organic solvent.
- a resist film that has been applied to and removed from the solvent may be used as a resist film.
- the support film used as the resist film include synthetic resin films such as polyethylene, polypropylene, polycarbonate, and polyethylene terephthalate, and may be a single layer film or a plurality of laminated films.
- the surface of the support film may be a corona-treated one or a release agent.
- the resist underlayer film according to the present invention is obtained by curing the photosensitive composition for forming a resist underlayer film according to the present invention.
- the substrate (substrate to be processed) on which the resist underlayer film is formed include a silicon wafer, a wafer coated with aluminum, and the like.
- the resist underlayer film according to the present invention forms, for example, a coating film by applying the resist underlayer film forming composition according to the present invention to the surface of the substrate to be processed or other underlayer film described later, It can be formed by curing the film by heat treatment or ultraviolet light irradiation and heat treatment.
- the method for applying the composition for forming a resist underlayer film according to the present invention include a spin coating method, a roll coating method, and a dip method.
- the heating temperature is usually 50 to 450 ° C., preferably 150 to 300 ° C.
- the heating time is usually 5 to 600 seconds.
- another lower layer film (hereinafter, also referred to as “other lower layer film”) that is formed in advance using the composition for forming a resist lower layer film according to the present invention and is different from the resist lower layer film is formed. May be.
- the other lower layer films include organic antireflection films disclosed in Japanese Patent Publication No. 6-12452 and Japanese Patent Application Laid-Open No. 59-93448.
- the thickness of the resist underlayer film according to the present invention is usually from 10 to 1,000 nm, preferably from 10 nm to 500 nm.
- the photosensitive underlayer film forming photosensitive composition according to the present invention can also be used as a resist material for forming a resist pattern.
- a resist material is applied onto a resist underlayer film formed on a substrate to be processed, and prebaked at a temperature of 60 to 150 ° C.
- the coating method at this time may be any method such as spin coating, roll coating, flow coating, dip coating, spray coating, doctor blade coating and the like.
- a resist pattern is created.
- the resist material is a positive type
- the target resist pattern is exposed through a predetermined mask, and the exposed portion is dissolved in an alkali developer to form a resist pattern. Form a pattern.
- Examples of the exposure light source here include infrared light, visible light, ultraviolet light, far-ultraviolet light, X-rays, and electron beams.
- Examples of ultraviolet light include g-line (wavelength 436 nm) and h-line (wavelength 436 nm) of a high-pressure mercury lamp. Examples include a wavelength 405 nm) i-line (wavelength 365 nm), a KrF excimer laser (wavelength 248 nm), an ArF excimer laser (wavelength 193 nm), an F2 excimer laser (wavelength 157 nm), and an EUV laser (wavelength 13.5 nm). Since the photosensitive composition for forming a resist underlayer film according to the present invention has high photosensitivity and alkali developability, a resist pattern can be formed with high resolution when any light source is used.
- the photosensitive composition for forming a resist underlayer film according to the present invention is excellent in heat resistance and dry etching resistance, the obtained coating film is also suitable as a permanent film remaining in the final product.
- the permanent film made of the photosensitive underlayer film forming photosensitive composition according to the present invention Has an excellent property that such a strain hardly occurs.
- a permanent film is a coating film made of a photosensitive composition formed on or between parts constituting a product in a display device such as a semiconductor device such as an IC or LSI, or a thin display. It remains even after completion.
- Specific examples of permanent films include solder resists, package materials, underfill materials, package adhesive layers such as circuit elements, adhesive layers between integrated circuit elements and circuit boards, and thin displays such as LCD and OELD. Examples include a thin film transistor protective film, a liquid crystal color filter protective film, a black matrix, and a spacer.
- a GPC chart of the novolak resin (3-b) is shown in FIG.
- Mn number average molecular weight
- Mw weight average molecular weight
- Mn polydispersity
- a GPC chart of the novolak resin (3-c) is shown in FIG.
- number average molecular weight (Mn) 2,529
- weight average molecular weight (Mw) 11,421
- polydispersity (Mw / Mn) 4.516. there were.
- a GPC chart of the novolak resin (3-d) is shown in FIG.
- number average molecular weight (Mn) 3,313
- weight average molecular weight (Mw) 25,435
- polydispersity (Mw / Mn) 7.678 there were.
- Examples 1 to 4, Comparative Example 1 For the novolak resins (3-a) to (3-e) synthesized in Synthesis Examples 3 to 6 and Comparative Synthesis Example 1, as shown in Table 1, novolak resins and curing agents (1,3,4,6-tetrakis) (Methoxymethyl) glycoluril (manufactured by Tokyo Chemical Industry Co., Ltd.) and PGMEA were mixed and dissolved at 10 / 0.5 / 50 (parts by mass), and then filtered using a 0.2 ⁇ m membrane filter. The photosensitive underlayer film forming photosensitive composition and the comparative resist underlayer film forming photosensitive composition according to the present invention were obtained. A coating film (resist underlayer film) was prepared using these compositions, and alkali solubility, heat resistance and dry etching resistance were evaluated in accordance with the following. The evaluation results are shown in Table 1.
- the alkali solubility was evaluated by measuring the alkali dissolution rate of the coating film. Specifically, the photosensitive underlayer film forming photosensitive composition according to the present invention or the comparative resist underlayer film forming photosensitive composition was applied onto a 5-inch silicon wafer with a spin coater, and a hot plate at 110 ° C. The film was dried for 60 seconds to obtain a silicon wafer having a coating film (resist underlayer film) having a thickness of about 1 ⁇ m. The obtained wafer was immersed in an alkali developer (2.38% tetramethylammonium hydroxide aqueous solution) for 60 seconds, and then dried on a 110 ° C. hot plate for 60 seconds.
- an alkali developer 2.38% tetramethylammonium hydroxide aqueous solution
- the film thickness of the coating film of the resist underlayer film forming photosensitive composition or the comparative resist underlayer film forming photosensitive composition was measured before and after the developer immersion, and the value obtained by dividing the difference by 60 (ADR ( The film thickness of the coating film was measured using a film thickness meter (“f-20” manufactured by Filmetrics Co., Ltd.).
- the heat resistance was evaluated based on the thermal decomposition start temperature of the coating film.
- the photosensitive underlayer film forming photosensitive composition according to the present invention or the comparative resist underlayer film forming photosensitive composition was applied onto a 5-inch silicon wafer with a spin coater, and a hot plate at 110 ° C.
- the film was dried for 60 seconds to obtain a silicon wafer having a coating film (resist underlayer film) having a thickness of about 1 ⁇ m.
- the resin content was scraped from the obtained wafer, and the thermal decomposition start temperature of this was measured.
- the pyrolysis start temperature was measured using a differential thermothermogravimetric simultaneous measurement device (manufactured by Seiko Instruments Inc., product name: TG / DTA 6200) in a nitrogen atmosphere, temperature range: room temperature to 400 ° C., temperature increase temperature: 10 It was determined by measuring the weight loss during heating at a constant rate under the conditions of ° C / min.
- the photosensitive underlayer film forming photosensitive composition according to the present invention or the comparative resist underlayer film forming photosensitive composition is applied onto a 5-inch silicon wafer by a spin coater, and is heated in a hot plate having an oxygen concentration of 20 vol%.
- the film was dried at 180 ° C. for 60 seconds, and then heated at 350 ° C. for 120 seconds to obtain a silicon wafer having a coating film (resist underlayer film) having a thickness of 0.3 ⁇ m.
- the obtained wafer was CF 4 / Ar / O 2 (CF 4 : 40 mL / min, Ar: 20 mL / min, O 2 : 5 mL / min, Etching was performed under the conditions of pressure: 20 Pa, RF power: 200 W, treatment time: 40 seconds, temperature: 15 ° C.
- the film thickness of the resist underlayer film forming photosensitive composition or the comparative resist underlayer film forming photosensitive composition was measured before and after the etching treatment, and the etching rate (nm / min) was calculated. Etching resistance was evaluated. In the evaluation, “ ⁇ ” indicates that the etching rate is 150 nm / min or less, and “x” indicates that the etching rate exceeds 150 nm / min.
- the coating films (Examples 1 to 4) of the photosensitive underlayer film forming photosensitive compositions containing the novolak resins (3-a) to (3-d), which are novolak-type phenolic resins according to the present invention The thermal decomposition starting temperature was 310 ° C. or higher, the heat resistance was excellent, and the dry etching resistance was also high.
- the alkali dissolution rate (ADR) was determined as in Example 2 (Novolak resin (3-b)), Example 3 (Novolak resin (3-c)), Example 4 (Novolak resin (3-d)), and Example 1 (novolak resin (3-a)) was faster in this order, and the more the content of the phenolic trinuclear compound (1) in the whole phenolic trinuclear compound used as a raw material, the more alkaline It has been found that the solubility in alkali can be controlled by adjusting the ratio of the phenolic trinuclear compound (1) and the phenolic trinuclear compound (2). In contrast, in Comparative Example 1, all of the thermal decomposition start temperature, ADR, and dry etching resistance were worse than those in Examples 1 to 4.
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Abstract
Description
で表される化合物からなる群より選択される1種以上のフェノール系3核体化合物(A)と、アルデヒド類(B)とを、酸触媒下で反応させて得られるノボラック型フェノール樹脂を含有することを特徴とする、レジスト下層膜形成用感光性組成物に関する。
測定装置:東ソー株式会社製「HLC-8220 GPC」
カラム:昭和電工株式会社製「Shodex KF802」(8.0mmI.D.×300mm)+昭和電工株式会社製「Shodex KF802」(8.0mmI.D.×300mm)+昭和電工株式会社製「Shodex KF803」(8.0mmI.D.×300mm)+昭和電工株式会社製「Shodex KF804」(8.0mmI.D.×300mm)、
カラム温度:40℃、
検出器: RI(示差屈折計)、
データ処理:東ソー株式会社製「GPC-8020モデルIIバージョン4.30」、
展開溶媒:テトラヒドロフラン、
流速:1.0mL/分、
試料:樹脂固形分換算で0.5質量%のテトラヒドロフラン溶液をマイクロフィルターでろ過したもの、
注入量:0.1mL、
標準試料:下記単分散ポリスチレン
東ソー株式会社製「A-500」
東ソー株式会社製「A-2500」
東ソー株式会社製「A-5000」
東ソー株式会社製「F-1」
東ソー株式会社製「F-2」
東ソー株式会社製「F-4」
東ソー株式会社製「F-10」
東ソー株式会社製「F-20」
樹脂の分子量分布は、GPCにより、ポリスチレン標準法において、以下の測定条件にて測定した。
測定装置:東ソー株式会社製「HLC-8220 GPC」、
カラム:昭和電工株式会社製「Shodex KF802」(8.0mmI.D.×300mm)+昭和電工株式会社製「Shodex KF802」(8.0mmI.D.×300mm)+昭和電工株式会社製「Shodex KF803」(8.0mmI.D.×300mm)+昭和電工株式会社製「Shodex KF804」(8.0mmI.D.×300mm)、
検出器: RI(示差屈折計)、
測定条件:カラム温度 40℃
展開溶媒 テトラヒドロフラン(THF)
流速 1.0mL/分
試料:樹脂固形分換算で1.0質量%のテトラヒドロフラン溶液をマイクロフィルターでろ過したもの(5μL)、
データ処理:東ソー株式会社製「GPC-8020モデルIIデータ解析バージョン4.30」、
標準試料:前記「GPC-8020モデルIIデータ解析バージョン4.30」の測定マニュアルに準拠して、分子量が既知の下記の単分散ポリスチレンを用いた。
東ソー株式会社製「A-500」
東ソー株式会社製「A-1000」
東ソー株式会社製「A-2500」
東ソー株式会社製「A-5000」
東ソー株式会社製「F-1」
東ソー株式会社製「F-2」
東ソー株式会社製「F-4」
東ソー株式会社製「F-10」
東ソー株式会社製「F-20」
東ソー株式会社製「F-40」
東ソー株式会社製「F-80」
東ソー株式会社製「F-128」
東ソー株式会社製「F-288」
東ソー株式会社製「F-550」
樹脂の13C-NMRスペクトルの測定は、日本電子株式会社製「JNM-LA300」を用い、試料のDMSO-d6溶液を分析して構造解析を行った。以下に、13C-NMRスペクトルの測定条件を示す。
測定モード:SGNNE(NOE消去の1H完全デカップリング法)
パルス角度:45℃パルス
試料濃度:30wt%
積算回数:10000回
冷却管を取り付けた2L容4つ口フラスコに、2,5-キシレノール293.2g(2.4モル)、4-ヒドロキシベンズアルデヒド122g(1モル)、及び2-エトキシエタノール500mLを仕込み、2-エトキシエタノールに2,5-キシレノール及び4-ヒドロキシベンズアルデヒドを溶解させた。続いて、当該4つ口フラスコ内の反応溶液に、氷浴中で冷却しながら硫酸10mLを添加した後、マントルヒーターで100℃、2時間加熱し、攪拌しながら反応させた。反応終了後の反応溶液に水を添加して再沈殿操作を行い、粗生成物を得た。当該粗生成物をアセトンに再溶解させた後、さらに水で再沈殿操作を行った。再沈殿操作により得られた生成物を濾別し、真空乾燥を行い、白色結晶の前駆体化合物(フェノール系3核体化合物(1))213gを得た。フェノール系3核体化合物(1)について、GPC及び13C-NMRスペクトル測定を行ったところ、目的の化合物であり、純度はGPCの面積比で98.2質量%であることを確認した。フェノール系3核体化合物(1)のGPCのチャート図を図1に、13C-NMRスペクトルのチャート図を図2に、それぞれ示す。
4-ヒドロキシベンズアルデヒド122g(1モル)に代えて、ベンズアルデヒド106.1g(1モル)を用いた以外は合成例1と同様にして、白色結晶の前駆体化合物(フェノール系3核体化合物(2))206gを得た。フェノール系3核体化合物(2)について、GPC及び13C-NMRスペクトル測定を行ったところ、目的の化合物であり、純度はGPCの面積比で98.7質量%であることを確認した。フェノール系3核体化合物(2)のGPCのチャート図を図3に、13C-NMRスペクトルのチャート図を図4に、それぞれ示す。
冷却管を取り付けた300mL容4つ口フラスコに、合成例1で得たフェノール系3核体化合物(1)17.4g(0.05モル)、92%パラホルムアルデヒド1.6g(0.05モル)、2-エトキシエタノール15mL、及び酢酸15mLを仕込み、2-エトキシエタノールと酢酸の混合溶媒中にフェノール系3核体化合物(1)及びパラホルムアルデヒドを溶解させた(フェノール系3核体化合物(1):フェノール系3核体化合物(2)=100:0)。続いて、当該4つ口フラスコ内の反応溶液に、氷浴中で冷却しながら硫酸10mLを添加した後、オイルバスで80℃に昇温し、4時間加熱し、攪拌しながら反応させた。反応終了後の反応溶液に水を添加して再沈殿操作を行い、粗生成物を得た。当該粗生成物をアセトンに再溶解させた後、さらに水で再沈殿操作を行った。再沈殿操作により得られた生成物を濾別し、真空乾燥を行い、淡赤色粉末のノボラック型フェノール樹脂(ノボラック樹脂(3-a))16.8gを得た。ノボラック樹脂(3-a)のGPCチャートを図5に示す。ノボラック樹脂(3-a)について、GPCを行ったところ、数平均分子量(Mn)=2,733、重量平均分子量(Mw)=10,984、多分散度(Mw/Mn)=4.019であった。
合成例1で得たフェノール系3核体化合物(1)17.4g(0.05モル)に代えて、合成例1で得たフェノール系3核体化合物(1)4.2g(0.012モル)と合成例2で得たフェノール系3核体化合物(2)12.6g(0.038モル)を用いた(フェノール系3核体化合物(1):フェノール系3核体化合物(2)=25:75)以外は合成例3と同様にして、淡赤色粉末のノボラック型フェノール樹脂(ノボラック樹脂(3-b))16.5gを得た。ノボラック樹脂(3-b)のGPCチャートを図6に示す。ノボラック樹脂(3-b)について、GPCを行ったところ、数平均分子量(Mn)=3,654、重量平均分子量(Mw)=18,798、多分散度(Mw/Mn)=5.144であった。
合成例1で得たフェノール系3核体化合物(1)17.4g(0.05モル)に代えて、合成例1で得たフェノール系3核体化合物(1)8.7g(0.025モル)と合成例2で得たフェノール系3核体化合物(2)8.3g(0.025モル)を用いた(フェノール系3核体化合物(1):フェノール系3核体化合物(2)=50:50)以外は合成例3と同様にして、淡赤色粉末のノボラック型フェノール樹脂(ノボラック樹脂(3-c))16.2gを得た。ノボラック樹脂(3-c)のGPCチャートを図7に示す。ノボラック樹脂(3-c)について、GPCを行ったところ、数平均分子量(Mn)=2,529、重量平均分子量(Mw)=11,421、多分散度(Mw/Mn)=4.516であった。
合成例1で得たフェノール系3核体化合物(1)17.4g(0.05モル)に代えて、合成例1で得たフェノール系3核体化合物(1)13.2g(0.038モル)と合成例2で得たフェノール系3核体化合物(2)4.0g(0.012モル)を用いた(フェノール系3核体化合物(1):フェノール系3核体化合物(2)=75:25)以外は合成例3と同様にして、淡赤色粉末のノボラック型フェノール樹脂(ノボラック樹脂(3-d))16.2gを得た。ノボラック樹脂(3-d)のGPCチャートを図8に示す。ノボラック樹脂(3-d)について、GPCを行ったところ、数平均分子量(Mn)=3,313、重量平均分子量(Mw)=25,435、多分散度(Mw/Mn)=7.678であった。
コンデンサー、温度計、及び撹拌装置を備えた反応装置に、9,9-ビス(4-ヒドロキシフェニル)フルオレン100g、プロピレングリコールモノメチルエーテルアセテート(PGMEA)100g及びパラホルムアルデヒド50gを仕込み、シュウ酸2gを添加し、脱水しながら120℃に昇温して、5時間反応させることにより、下記式で表される構造単位からなるノボラック型フェノール樹脂(ノボラック樹脂(3-e))98gを得た。
合成例3~6及び比較合成例1で合成したノボラック樹脂(3-a)~(3-e)について、表1に示すように、ノボラック樹脂と硬化剤(1,3,4,6-テトラキス(メトキシメチル)グリコールウリル、東京化成工業株式会社製)及びPGMEAを10/0.5/50(質量部)で混合して溶解させた後、0.2μmメンブランフィルターを用いて濾過し、本発明に係るレジスト下層膜形成用感光性組成物及び比較対照用レジスト下層膜形成用感光性組成物を得た。これらの組成物を用いて塗膜(レジスト下層膜)を作成し、下記に従ってアルカリ溶解性、耐熱性及びドライエッチング耐性を評価した。評価結果を第1表に示す。
塗膜のアルカリ溶解速度を測定することにより、アルカリ溶解性を評価した。具体的には、本発明に係るレジスト下層膜形成用感光性組成物又は比較対照用レジスト下層膜形成用感光性組成物を、5インチシリコンウェハー上にスピンコーターで塗布し、110℃のホットプレート上で60秒間乾燥させ、約1μmの厚さの塗膜(レジスト下層膜)を有するシリコンウェハーを得た。得られたウェハーを、アルカリ現像液(2.38%水酸化テトラメチルアンモニウム水溶液)に60秒間浸漬させた後、110℃のホットプレート上で60秒間乾燥させた。当該レジスト下層膜形成用感光性組成物又は比較対照用レジスト下層膜形成用感光性組成物の塗膜の膜厚を、現像液浸漬前後で測定し、その差分を60で除した値(ADR(nm/s)をアルカリ溶解性の評価結果とした。塗膜の膜厚は、膜厚計(フィルメトリクス株式会社製「f-20」)を用いて測定した。
耐熱性の評価は、塗膜の熱分解開始温度で評価した。具体的には、本発明に係るレジスト下層膜形成用感光性組成物又は比較対照用レジスト下層膜形成用感光性組成物を、5インチシリコンウェハー上にスピンコーターで塗布し、110℃のホットプレート上で60秒間乾燥させ、約1μmの厚さの塗膜(レジスト下層膜)を有するシリコンウェハーを得た。得られたウェハーより樹脂分をかきとり、これの熱分解開始温度を測定した。熱分解開始温度は、示差熱熱重量同時測定装置(セイコーインスツールメント社製、製品名:TG/DTA 6200)を用いて、窒素雰囲気下、温度範囲:室温~400℃、昇温温度:10℃/分の条件で、一定速度で昇温時の重量減少を測定することにより求めた。
本発明に係るレジスト下層膜形成用感光性組成物又は比較対照用レジスト下層膜形成用感光性組成物を、5インチシリコンウェハー上にスピンコーターで塗布し、酸素濃度20容量%のホットプレート内で180℃、60秒間乾燥させ、続いて350℃で120秒間加熱し、膜厚0.3μmの厚さの塗膜(レジスト下層膜)を有するシリコンウェハーを得た。得られたウェハーを、エッチング装置(神鋼精機株式会社製「EXAM」)を用いて、CF4/Ar/O2(CF4:40mL/分、Ar:20mL/分、O2:5mL/分、圧力:20Pa、RFパワー:200W、処理時間:40秒間、温度:15℃)の条件でエッチング処理した。当該レジスト下層膜形成用感光性組成物又は比較対照用レジスト下層膜形成用感光性組成物の塗膜の膜厚を、エッチング処理前後で測定し、エッチング速度(nm/分)を算出し、ドライエッチング耐性を評価した。評価は、エッチング速度が150nm/分以下のものを「○」、エッチング速度が150nm/分を超えるものを「×」とした。
Claims (11)
- 下記一般式(1)
[式(1)中、R1、R2、及びR3は、それぞれ独立して置換基を有していてもよい炭素原子数1~8のアルキル基を表す。R1が複数存在する場合は、それらは同一でもよく異なっていてもよく、R2が複数存在する場合は、それらは同一でもよく異なっていてもよく、R3が複数存在する場合は、それらは同一でもよく異なっていてもよい。p及びqはそれぞれ独立して1~4の整数であり、rは0~4の整数であり、sは1又は2である。ただし、rとsの和は5以下である。]
で表される化合物及び下記一般式(2)
[式(2)中、R1、R2、R3、p、及びqは、前記式(1)と同じであり、tは0~5の整数である。]
で表される化合物からなる群より選択される1種以上のフェノール系3核体化合物(A)とアルデヒド類(B)とを、酸触媒下で反応させて得られるノボラック型フェノール樹脂を含有することを特徴とする、レジスト下層膜形成用感光性組成物。 - 前記フェノール系3核体化合物(A)が、下記一般式(1-1)、(1-2)、(1-7)、(1-8)、(1-13)、(1-14)、(2-1)又は(2-2)
[式中、R1、R2、及びR3は、それぞれ独立して置換基を有していてもよい炭素原子数1~8のアルキル基を表す。複数存在するR1は、互いに同一でもよく異なっていてもよく、複数存在するR2は、互いに同一でもよく異なっていてもよく、R3が複数存在する場合は、それらは同一でもよく異なっていてもよい。r1は0~4の整数を表し、r2は0~3の整数を表し、tは0~5の整数を表す。]
で表される化合物からなる群から選ばれる1種以上の化合物である、請求項1に記載のレジスト下層膜形成用感光性組成物。 - 前記ノボラック型フェノール樹脂が、繰り返し単位として、下記一般式(I-1)
[式(I-1)中、R1及びR2は、前記式(1)と同じであり、R4は、水素原子、置換基を有していてもよいアルキル基、又は置換基を有していてもよいアリール基を表す。]
で表される構造単位(I-1)、下記一般式(I-2)
[式(I-2)中、R1及びR2は、前記式(1)と同じであり、R4は、前記式(I-1)と同じである。]
で表される構造単位(I-2)、下記一般式(II-1)
[式(II-1)中、R1及びR2は、前記式(1)と同じであり、R4は、前記式(I-1)と同じである。]
で表される構造単位(II-1)、及び下記一般式(II-2)
[式(II-2)中、R1及びR2は、前記式(1)と同じであり、R4は、前記式(I-1)と同じである。]
で表される構造単位(II-2)からなる群より選択される1種以上の構造部位を有する、請求項1に記載のレジスト下層膜形成用感光性組成物。 - 前記R1及びR2が共にメチル基である、請求項3に記載のレジスト下層膜形成用感光性組成物。
- 前記ノボラック型フェノール樹脂が、前記一般式(I-1)で表される構造単位又は前記一般式(II-1)で表される構造単位を繰り返し単位として有し、かつ重量平均分子量が7,000~25,000である、請求項3に記載のレジスト下層膜形成用感光性組成物。
- 前記ノボラック型フェノール樹脂が、前記一般式(I-2)で表される構造単位又は前記一般式(II-2)で表される構造単位を繰り返し単位として有し、かつ重量平均分子量が1,000~5,000である、請求項3に記載のレジスト下層膜形成用感光性組成物。
- 前記アルデヒド類(B)がホルムアルデヒドである、請求項1~6の何れか一項に記載のレジスト下層膜形成用感光性組成物。
- 前記ノボラック型フェノール樹脂の重量平均分子量が1,000~35,000である、請求項1~4、及び7の何れか一項に記載のレジスト下層膜形成用感光性組成物。
- さらに、有機溶剤を含有する、請求項1~8の何れか一項に記載のレジスト下層膜形成用感光性組成物。
- さらに、光酸発生剤及び硬化剤からなる群より選択される1種以上を含有する、請求項1~9の何れか一項に記載のレジスト下層膜形成用感光性組成物。
- 請求項1~10の何れか一項に記載のレジスト下層膜形成用感光性組成物を硬化させてなることを特徴とする、レジスト下層膜。
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| JP2016509803A JP6076540B2 (ja) | 2014-12-02 | 2015-11-10 | 硬化性樹脂組成物及びレジスト下層膜 |
| KR1020177007112A KR102434737B1 (ko) | 2014-12-02 | 2015-11-10 | 경화성 수지 조성물 및 레지스트 하층막 |
| US15/532,367 US20170329221A1 (en) | 2014-12-02 | 2015-11-10 | Photosensitive composition for forming resist underlayer film, and resist underlayer film |
| CN201580065831.XA CN107003612B (zh) | 2014-12-02 | 2015-11-10 | 抗蚀剂下层膜形成用感光性组合物及抗蚀剂下层膜 |
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| JP (2) | JP6076540B2 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2017125182A (ja) * | 2016-01-08 | 2017-07-20 | Jsr株式会社 | レジスト下層膜形成用重合体及びその製造方法、レジスト下層膜形成用組成物、レジスト下層膜並びにパターニングされた基板の製造方法 |
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| WO2016084495A1 (ja) * | 2014-11-25 | 2016-06-02 | Dic株式会社 | ノボラック型フェノール樹脂、その製造方法、感光性組成物、レジスト材料、及び塗膜 |
| CN113227181B (zh) * | 2018-12-26 | 2023-07-18 | Dic株式会社 | 抗蚀剂组合物 |
| CN110597016B (zh) * | 2019-09-29 | 2022-10-14 | 北京北旭电子材料有限公司 | 一种光刻胶组合物、制备方法及图案化方法 |
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| WO2014185335A1 (ja) * | 2013-05-13 | 2014-11-20 | 日産化学工業株式会社 | ビスフェノールアルデヒドを用いたノボラック樹脂含有レジスト下層膜形成組成物 |
| WO2015141427A1 (ja) * | 2014-03-20 | 2015-09-24 | Dic株式会社 | ノボラック型フェノール性水酸基含有樹脂、その製造方法、硬化性組成物、レジスト用組成物及びカラーレジスト |
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| JP5257009B2 (ja) * | 2008-11-14 | 2013-08-07 | Jsr株式会社 | レジスト下層膜形成用組成物、レジスト下層膜の形成方法、及びパターン形成方法 |
| JP5635258B2 (ja) * | 2009-12-11 | 2014-12-03 | 昭和電工株式会社 | 変性ノボラック樹脂および前記変性ノボラック樹脂を配合した熱硬化性樹脂組成物 |
| JP6064360B2 (ja) | 2011-05-11 | 2017-01-25 | Jsr株式会社 | パターン形成方法及びレジスト下層膜形成用組成物 |
| JP6124025B2 (ja) * | 2012-08-21 | 2017-05-10 | 日産化学工業株式会社 | 多核フェノール類を有するノボラック樹脂を含むレジスト下層膜形成組成物 |
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- 2015-11-10 WO PCT/JP2015/081572 patent/WO2016088515A1/ja not_active Ceased
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| WO2012063636A1 (ja) * | 2010-11-10 | 2012-05-18 | Dic株式会社 | ポジ型フォトレジスト組成物 |
| WO2012141165A1 (ja) * | 2011-04-12 | 2012-10-18 | Dic株式会社 | ポジ型フォトレジスト組成物、その塗膜及びノボラック型フェノール樹脂 |
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| JP2017125182A (ja) * | 2016-01-08 | 2017-07-20 | Jsr株式会社 | レジスト下層膜形成用重合体及びその製造方法、レジスト下層膜形成用組成物、レジスト下層膜並びにパターニングされた基板の製造方法 |
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| JP2017037326A (ja) | 2017-02-16 |
| TWI668252B (zh) | 2019-08-11 |
| US20170329221A1 (en) | 2017-11-16 |
| KR20170089834A (ko) | 2017-08-04 |
| JPWO2016088515A1 (ja) | 2017-04-27 |
| CN107003612B (zh) | 2020-11-06 |
| JP6076540B2 (ja) | 2017-02-08 |
| TW201634509A (zh) | 2016-10-01 |
| KR102434737B1 (ko) | 2022-08-22 |
| CN107003612A (zh) | 2017-08-01 |
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