WO2021215240A1 - レジスト下層膜形成用組成物及び半導体基板の製造方法 - Google Patents
レジスト下層膜形成用組成物及び半導体基板の製造方法 Download PDFInfo
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- WO2021215240A1 WO2021215240A1 PCT/JP2021/014642 JP2021014642W WO2021215240A1 WO 2021215240 A1 WO2021215240 A1 WO 2021215240A1 JP 2021014642 W JP2021014642 W JP 2021014642W WO 2021215240 A1 WO2021215240 A1 WO 2021215240A1
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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
- 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
- G03F7/075—Silicon-containing compounds
- G03F7/0757—Macromolecular compounds containing Si-O, Si-C or Si-N bonds
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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
- G03F7/075—Silicon-containing compounds
- G03F7/0752—Silicon-containing compounds in non photosensitive layers or as additives, e.g. for dry lithography
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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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
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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
- G03F7/0042—Photosensitive materials with inorganic or organometallic light-sensitive compounds not otherwise provided for, e.g. inorganic 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
- G03F7/095—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having more than one photosensitive layer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2004—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the use of a particular light source, e.g. fluorescent lamps or deep UV light
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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
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/322—Aqueous alkaline compositions
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- H10P50/71—
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- H10P50/73—
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- H10P76/405—
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- H10P76/4085—
Definitions
- the present invention relates to a composition for forming a resist underlayer film and a method for producing a semiconductor substrate.
- a multilayer resist process may be used for pattern formation in the manufacture of semiconductor substrates.
- etching is performed using a resist pattern obtained by exposing and developing a resist film laminated on a substrate via a resist underlayer film such as an organic underlayer film or a silicon-containing film as a mask.
- a patterned substrate is formed (see International Publication No. 2012/039337).
- the exposure light used is extreme ultraviolet (13.) from KrF excimer laser (248 nm), ArF excimer laser (193 nm) and the like.
- the wavelength tends to be shortened to 5 nm (EUV).
- lithography using an electron beam may be performed in order to form a fine pattern.
- a fine metal is used by using a composition for forming a metal-containing resist film on a silicon-containing film which is a resist underlayer film (hereinafter, also referred to as “composition for forming a metal-containing resist film”). It is required to be able to form a contained resist pattern.
- composition for forming a metal-containing resist film it is difficult to suppress the collapse of the metal-containing resist pattern and to form a fine metal-containing resist pattern in a good shape. In particular, the finer the resist pattern formed, the more likely it is that the metal-containing resist pattern will collapse during development or the like.
- the present invention has been made based on the above circumstances, and an object thereof is used for forming an underlayer film of a metal-containing resist in electron beam or extreme ultraviolet lithography, and suppresses collapse of a metal-containing resist pattern.
- a resist underlayer film forming composition capable of forming a resist underlayer film capable of forming a fine metal-containing resist pattern, and a method for producing a semiconductor substrate using such a resist underlayer film forming composition. It is in.
- the invention made to solve the above problems is a resist underlayer film forming composition used for forming a metal-containing resist underlayer film in electron beam or extreme ultraviolet lithography, which is represented by the following formula (1).
- X is an organic group having at least one structure selected from a hydroxy group, a carbonyl group and an ether bond.
- A is an integer of 1 to 3. When a is 2 or more, A plurality of X's are the same or different from each other.
- R 1 is a monovalent organic group having 1 to 20 carbon atoms, a hydroxy group or a halogen atom. However, R 1 is a group other than X. B is 0. for ⁇ 2 is an integer .b is 2, the two R 1 may be the same or different from each other. However, a + b is 3 or less.)
- Another invention made to solve the above problems is a step of directly or indirectly applying a resist underlayer film forming composition to a substrate, and a resist formed by the resist underlayer film forming composition coating step.
- the composition for forming a resist underlayer film is a method for producing a semiconductor substrate, which is the above-mentioned composition for forming a resist underlayer film, which comprises a step of developing the exposed metal-containing resist film.
- the present invention is used for forming a underlayer film of a metal-containing resist in electron beam or extreme ultraviolet lithography, suppresses collapse of the metal-containing resist pattern, and forms a resist underlayer film capable of forming a fine metal-containing resist pattern. It is possible to provide a composition for forming a resist underlayer film that can be used, and a method for producing a semiconductor substrate using such a composition for forming a resist underlayer film.
- the resist underlayer film forming composition contains a compound [A] and a solvent [B].
- the composition for forming a resist underlayer film contains additives other than the compound [A] and the solvent [B] (hereinafter, also referred to as "[C] additive") as long as the effects of the present invention are not impaired. It may be contained.
- the resist underlayer film forming composition suppresses the collapse of the pattern on the metal-containing resist underlayer film formed by electron beam or extreme ultraviolet lithography.
- a fine metal-containing resist pattern can be formed.
- the resist underlayer film forming composition has the above-mentioned effects, it can be suitably used as a composition for forming a metal-containing resist film underlayer film in electron beam or extreme ultraviolet lithography.
- the compound [A] is a polysiloxane compound having a first structural unit (hereinafter, also referred to as “structural unit (I)”) represented by the following formula (1), which will be described later.
- structural unit (I) a polysiloxane compound having a first structural unit (hereinafter, also referred to as “structural unit (I)”) represented by the following formula (1), which will be described later.
- the term "polysiloxane compound” means a compound containing a siloxane bond (-Si-O-Si-).
- the compound [A] may have a structural unit other than the structural unit (I) as long as the effect of the present invention is not impaired. Examples of other structural units include a second structural unit represented by the following formula (2) described later (hereinafter, also referred to as “structural unit (II)”) and a second structural unit represented by the following formula (3) described later. Examples thereof include three structural units (hereinafter, also referred to as “structural unit (III)”).
- the structural unit (I) is a structural unit represented by the following formula (1).
- the compound [A] can have one or more structural units (I).
- X is an organic group containing at least one structure selected from the group consisting of a hydroxy group, a carbonyl group and an ether bond.
- a is an integer of 1 to 3.
- R 1 is a monovalent organic group, a hydroxy group or a halogen atom having 1 to 20 carbon atoms.
- R 1 is a group other than X.
- b is an integer of 0 to 2. If b is 2, the two R 1 may be the same or different from each other. However, a + b is 3 or less.
- the "organic group” means a group containing at least one carbon atom
- the "carbon number” means the number of carbon atoms constituting the group.
- Examples of the monovalent organic group having 1 to 20 carbon atoms represented by R 1 include a monovalent hydrocarbon group having 1 to 20 carbon atoms and a divalent heteroatom between the carbon-carbon bonds of the hydrocarbon group.
- a group containing a containing group hereinafter, also referred to as "group ( ⁇ )", a group in which a part or all of the hydrogen atom of the above hydrocarbon group or the above group ( ⁇ ) is substituted with a monovalent heteroatom-containing group (hereinafter, Hereinafter, also referred to as "group ( ⁇ )"), the above-mentioned hydrocarbon group, the above-mentioned group ( ⁇ ) or a group in which the above-mentioned group ( ⁇ ) and a divalent heteroatom-containing group are combined (hereinafter, "group ( ⁇ )”". Also called) and the like. It is assumed that the monovalent organic group having 1 to 20 carbon atoms represented by R 1 does not include the group represented by X.
- the "hydrocarbon group” includes a chain hydrocarbon group, an alicyclic hydrocarbon group and an aromatic hydrocarbon group. This “hydrocarbon group” may be a saturated hydrocarbon group or an unsaturated hydrocarbon group.
- the "chain hydrocarbon group” refers to a hydrocarbon group that does not contain a cyclic structure and is composed only of a chain structure, and includes both a linear hydrocarbon group and a branched hydrocarbon group.
- the "alicyclic hydrocarbon group” refers to a hydrocarbon group containing only an alicyclic structure as a ring structure and not containing an aromatic ring structure, and refers to a monocyclic alicyclic hydrocarbon group and a polycyclic alicyclic group. Contains both hydrocarbon groups.
- aromatic hydrocarbon group refers to a hydrocarbon group containing an aromatic ring structure as a ring structure. However, it does not have to be composed only of an aromatic ring structure, and a chain structure or an alicyclic structure may be included as a part thereof.
- Examples of the monovalent hydrocarbon group having 1 to 20 carbon atoms include a monovalent chain hydrocarbon group having 1 to 20 carbon atoms, a monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and 6 carbon atoms. Examples thereof include to 20 monovalent aromatic hydrocarbon groups.
- Examples of monovalent chain hydrocarbon groups having 1 to 20 carbon atoms include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, sec-butyl group, iso-butyl group and tert.
- -Alkyl groups such as butyl groups, alkenyl groups such as ethenyl groups, propenyl groups and butenyl groups, alkynyl groups such as ethynyl groups, propynyl groups and butynyl groups and the like can be mentioned.
- Examples of monovalent alicyclic hydrocarbon groups having 3 to 20 carbon atoms include monocyclic saturated hydrocarbon groups such as cyclopentyl groups and cyclohexyl groups, norbornyl groups, adamantyl groups, tricyclodecyl groups, and tetracyclos.
- Polycyclic alicyclic saturated hydrocarbon group such as dodecyl group, monocyclic alicyclic unsaturated hydrocarbon group such as cyclopentenyl group and cyclohexenyl group, norbornenyl group, tricyclodecenyl group, tetracyclodode
- Examples thereof include a polycyclic alicyclic unsaturated hydrocarbon group such as a senyl group.
- Examples of the monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms include an aryl group such as a phenyl group, a tolyl group, a xsilyl group, a naphthyl group and an anthryl group, a benzyl group, a phenethyl group, a naphthylmethyl group and an anthrylmethyl group.
- Examples include an aralkyl group such as a group.
- hetero atom constituting the divalent or monovalent hetero atom-containing group
- examples of the hetero atom constituting the divalent or monovalent hetero atom-containing group include an oxygen atom, a nitrogen atom, a sulfur atom, a phosphorus atom, a silicon atom, a halogen atom and the like.
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- R' is a hydrogen atom or a monovalent hydrocarbon group.
- Examples of the monovalent heteroatom-containing group include a halogen atom, a hydroxy group, a carboxy group, a cyano group, an amino group, a sulfanyl group and the like.
- Examples of the halogen atom represented by R 1 include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- a monovalent organic group having 1 to 20 carbon atoms is preferable, and a part of hydrogen atoms contained in a monovalent chain hydrocarbon group, a monovalent aromatic hydrocarbon group, or a monovalent hydrocarbon group.
- a monovalent group in which the whole is substituted with a monovalent heteroatom-containing group is more preferable, an alkyl group or an aryl group is more preferable, and a methyl group, an ethyl group or a phenyl group is further preferable.
- 0 or 1 is preferable, and 0 is more preferable.
- X in the above formula (1) is an organic group having at least one structure selected from the group consisting of a hydroxy group, a carbonyl group and an ether bond.
- Examples of the organic group having a hydroxy group include hydroxyalkyl groups such as a hydroxymethyl group and a hydroxyethyl group.
- Examples of the organic group having a carbonyl group include an organic group having an ester bond, an organic group having a carbonate structure, an organic group having an amide bond, an organic group having an acyl group, an organic group having a carboxylic acid anhydride group and the like. Be done.
- Examples of the organic group having a carbonyl group include groups represented by the following formula (1-1) and the following formula (1-2).
- R 2 and R 4 are monovalent organic groups having 1 to 20 carbon atoms.
- n is 1 or 2. when n is 2, a plurality of R 2 may be the same or different from each other.
- R 3 is a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms.
- L is a single bond or divalent linking group. * Indicates the binding site with the silicon atom in the above formula (1).
- the monovalent organic group having 1 to 20 carbon atoms represented by R 2 and R 4 is the same as the group exemplified as the monovalent organic group having 1 to 20 carbon atoms represented by R 1 described above.
- the group etc. can be mentioned.
- R 2 and R 4 are preferably a monovalent chain hydrocarbon group having 1 to 20 carbon atoms or a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms, and are preferably a monovalent chain hydrocarbon group having 1 to 20 carbon atoms. Hydrocarbon groups are more preferred.
- Examples of the divalent linking group represented by L include a divalent organic group having 1 to 20 carbon atoms.
- a divalent hydrocarbon group having 1 to 20 carbon atoms is preferable, a divalent chain hydrocarbon group having 1 to 20 carbon atoms is more preferable, and an alcandiyl group having 1 to 20 carbon atoms is further preferable.
- the number of carbon atoms of the group represented by L is preferably 1 to 12, more preferably 1 to 6.
- a more preferred form of the group represented by L is a group represented by ⁇ (CH 2 ) m ⁇ (m is an integer from 1 to 6).
- Examples of the organic group having an ether bond in X in the formula (1) include a t-butoxymethyl group, a t-butoxyethyl group, and an organic group having an acetal structure.
- 1 or 2 is preferable, and 1 is more preferable.
- Examples of the structural unit (I) include structural units derived from compounds represented by the following formulas (1-1) to (1-10).
- the lower limit of the content ratio of the structural unit (I) in the compound [A] is preferably 0.1 mol%, more preferably 1 mol%, and 2 mol% with respect to all the structural units constituting the [A] compound. Is even more preferable, and 3 mol% is even more preferable.
- the upper limit of the content ratio of the structural unit (I) is preferably 80 mol%, more preferably 50 mol%, and even more preferably 20 mol%.
- the structural unit (II) is a structural unit represented by the following formula (2).
- the oxygen gas etching resistance of the resist underlayer film formed by the resist underlayer film forming composition can be improved.
- the compound [A] can have one or more structural units (II).
- R 5 is a monovalent alkoxy group substituted or unsubstituted C 1 -C 20 hydroxy group, or a halogen atom.
- c is an integer of 0 to 3. When c is 2 or more, a plurality of R 5s are the same or different.
- Examples of the substituted or unsubstituted monovalent alkoxy group having 1 to 20 carbon atoms represented by R 5 include a methoxy group, an ethoxy group, a propoxy group and the like.
- Examples of the halogen atom represented by R 5 include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- the lower limit of the content ratio of the structural unit (II) is 30 mol% with respect to all the structural units constituting the compound [A].
- 40 mol% is more preferred, and in some cases 50 mol%, 60 mol% or 70 mol% is even more preferred.
- the upper limit of the content ratio is preferably 95 mol%, more preferably 90 mol%, still more preferably 85 mol%.
- the structural unit (III) is a structural unit represented by the following formula (3).
- the storage stability and coatability of the resist underlayer film forming composition can be improved.
- the compound [A] can have one or more structural units (III).
- R 6 is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms.
- d is an integer of 1 to 3.
- R 6 of 2 is the same or different.
- R 7 is a substituted or unsubstituted monovalent organic group having 1 to 20 carbon atoms, a hydroxy group, or a halogen atom.
- e is an integer of 0 to 2. When there are a plurality of e, the plurality of R 3s are the same or different. However, d + e is 3 or less.
- the substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms represented by R 6 is exemplified as, for example, the above-mentioned monovalent hydrocarbon group having 1 to 20 carbon atoms represented by R 1. Examples thereof include groups similar to groups.
- Examples of the halogen atom represented by R 7 include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- R 7 a substituted or unsubstituted monovalent alkoxy group having 1 to 20 carbon atoms is preferable, and a methoxy group and an ethoxy group are more preferable.
- the lower limit of the content ratio of the structural unit (III) is 0.1 mol with respect to all the structural units constituting the [A] compound. % Is preferred, 1 mol% is more preferred, and 2 mol%, 3 mol% or 5 mol% may be even more preferred.
- the upper limit of the content ratio is preferably 40 mol%, more preferably 30 mol%, still more preferably 20 mol%.
- the lower limit of the total content ratio of the structural unit (I), the structural unit (II) and the structural unit (III) with respect to all the structural units constituting the compound is preferably 80 mol%, more preferably 90 mol%. 95 mol% or 99 mol% may be more preferred.
- the upper limit of the total content ratio may be 100 mol%.
- the lower limit of the content ratio of the compound [A] in the resist underlayer film forming composition is preferably 0.1% by mass, preferably 0.3% by mass, based on all the components contained in the resist underlayer film forming composition. % Is more preferable, and 0.5% by mass is further preferable.
- As the upper limit of the content ratio 10% by mass is preferable, 5% by mass is more preferable, 3% by mass is more preferable, and 2% by mass is more preferable.
- the compound [A] is preferably in the form of a polymer.
- polymer refers to a compound having two or more structural units, and when the same structural unit is continuous in two or more in a polymer, this structural unit is also referred to as a "repeating unit".
- the lower limit of the polystyrene-equivalent weight average molecular weight (Mw) of the compound [A] by gel permeation chromatography (GPC) is preferably 1,000, preferably 1,200. More preferably, 1,500 is even more preferable.
- the upper limit of Mw is preferably 10,000, more preferably 5,000, and even more preferably 3,000.
- the Mw of the compound [A] uses a GPC column (2 "G2000HXL”, 1 "G3000HXL” and 1 "G4000HXL”) of Tosoh Corporation, and gel permeation under the following conditions. It is a value measured by ion chromatography (GPC).
- GPC ion chromatography
- Eluent tetrahydrofuran Flow rate: 1.0 mL / min Sample concentration: 1.0% by mass
- Sample injection volume 100 ⁇ L
- Detector Differential refractometer Standard material: Monodisperse polystyrene
- the [A] compound can be synthesized by a conventional method using a monomer that gives each structural unit.
- a monomer giving the structural unit (I) and, if necessary, a monomer giving another structural unit can be synthesized by hydrolyzing and condensing in a solvent in the presence of a catalyst such as oxalic acid and water. can. It is considered that each monomer is incorporated into the [A] compound regardless of the type by a hydrolysis condensation reaction or the like. Therefore, the content ratio of the structural unit (I) and other structural units in the synthesized [A] compound is usually equal to the ratio of the charged amount of each monomer used in the synthesis reaction.
- the solvent is not particularly limited, and examples thereof include an alcohol solvent, a ketone solvent, an ether solvent, an ester solvent, and a nitrogen-containing solvent.
- the solvent is usually an organic solvent.
- the resist underlayer film forming composition may contain one kind or two or more kinds of [B] solvents.
- Examples of the alcohol solvent include monoalcohol solvents such as methanol, ethanol, n-propanol, iso-propanol, n-butanol and iso-butanol, ethylene glycol, 1,2-propylene glycol, diethylene glycol and dipropylene glycol.
- Examples include polyhydric alcohol solvents.
- ketone solvent examples include acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl-iso-butyl ketone, cyclohexanone, 2-heptanone and the like.
- ether-based solvents examples include ethyl ether, iso-propyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol monopropyl ether.
- ether-based solvents include ethyl ether, iso-propyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol monopropyl ether.
- examples thereof include tetrahydrofuran.
- ester solvent examples include ethyl acetate, ⁇ -butyrolactone, n-butyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, and acetic acid.
- ester solvent examples include propylene glycol monoethyl ether, dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether acetate, ethyl propionate, n-butyl propionate, methyl lactate, ethyl lactate and the like.
- nitrogen-containing solvent examples include N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone and the like.
- an ether solvent or an ester solvent is preferable, and an ether solvent having a glycol structure or an ester solvent having a glycol structure is more preferable because the film forming property is excellent.
- Examples of the ether solvent having a glycol structure and the ester solvent having a glycol structure include propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and acetate.
- Examples thereof include propylene glycol monopropyl ether and the like. Among these, propylene glycol monomethyl ether acetate or propylene glycol monoethyl ether is preferable.
- the lower limit of the content ratio of the solvent [B] in the resist underlayer film forming composition is preferably 90% by mass, preferably 92.5% by mass, based on all the components contained in the resist underlayer film forming composition. More preferably, 95% by mass is further preferable.
- the upper limit of the content ratio is preferably 99.9% by mass, more preferably 99.5% by mass, and even more preferably 99% by mass.
- [C] Additive] include, for example, acid generators, basic compounds (including base generators), radical generators, surfactants, colloidal silica, colloidal alumina, organic polymers, water and the like.
- the resist underlayer film forming composition may contain one kind or two or more kinds of [C] additives.
- the content ratio of the [C] additive in the resist underlayer film forming composition depends on the type of the [C] additive used. Further, it can be appropriately determined as long as the effect of the present invention is not impaired.
- the method for preparing the composition for forming a resist underlayer film is not particularly limited, and the composition can be prepared according to a conventional method.
- a solution of the compound [A], a solvent of [B], and an additive of [C], if necessary, are mixed at a predetermined ratio, and the obtained mixed solution is preferably mixed with a filter having a pore size of 0.2 ⁇ m or less. It can be prepared by filtering.
- the method for manufacturing the semiconductor substrate includes a step of directly or indirectly applying the resist underlayer film forming composition to the substrate (hereinafter, also referred to as “resist underlayer film forming composition coating step”) and the resist underlayer.
- a step of directly or indirectly applying a metal-containing resist film-forming composition to a resist underlayer film formed by a film-forming composition coating step (hereinafter, also referred to as a "metal-containing resist film-forming composition coating step”).
- the metal-containing resist film formed by the composition coating step for forming the metal-containing resist film is exposed to an electron beam or extreme ultraviolet rays (hereinafter, also referred to as “exposure step”), and the exposure is performed.
- It includes a step of developing a metal-containing resist film (hereinafter, also referred to as a “development step”).
- a step of developing a metal-containing resist film hereinafter, also referred to as a “development step”.
- the above-mentioned composition for forming a resist underlayer film is used as the composition for forming a resist underlayer film.
- the method for manufacturing the semiconductor substrate is, if necessary, after the above-mentioned resist underlayer film forming composition coating step and before the metal-containing resist film forming composition coating step, the above-mentioned resist underlayer film forming composition coating.
- a step of heating the coating film formed by the step (hereinafter, also referred to as a “heating step”) may be further provided.
- the method for manufacturing the semiconductor substrate is a step of directly or indirectly forming an organic underlayer film on the substrate (hereinafter, "organic underlayer film forming step") before the process of applying the composition for forming a resist underlayer film, if necessary. ”) May be further provided.
- the method for manufacturing the semiconductor substrate may include a step (hereinafter, also referred to as "etching step") of etching using the formed resist pattern or the like as a mask after the developing step. By this etching process, a fine pattern is formed on the substrate itself.
- etching step a step of etching using the formed resist pattern or the like as a mask after the developing step.
- the above-mentioned composition for forming the resist underlayer film is used for forming the resist underlayer film, and exposure is performed by electron beam or extreme ultraviolet rays, so that a fine resist is formed on the metal-containing resist underlayer film.
- a pattern can be formed. Therefore, according to the method for manufacturing the semiconductor substrate, it is possible to efficiently manufacture the semiconductor substrate on which a fine pattern is formed.
- the "semiconductor substrate” in the manufacturing method refers to a substrate used for a semiconductor device (semiconductor element), and is not limited to a substrate whose material is a semiconductor.
- the size of the resist pattern and the substrate pattern (pattern formed on the substrate) formed in the manufacturing method may have a portion having a line width of 100 nm or less, 50 nm or less, 30 nm or less, 20 nm or less, or 15 nm or less, for example. preferable.
- the minimum line width of the resist pattern formed may be, for example, 2 nm, 5 nm or 10 nm.
- an organic underlayer film is directly or indirectly formed on the substrate described later before the resist underlayer film forming composition coating step described later.
- This step is an arbitrary step.
- an organic underlayer film is formed directly or indirectly on the substrate. Note that "before the resist underlayer film forming composition coating step” does not mean only immediately before the resist underlayer film forming composition coating step, but from the resist underlayer film forming composition coating step. Also means the time point upstream. Therefore, any other step may be provided between this step and the step of applying the composition for forming the resist underlayer film.
- the organic underlayer film can be formed by, for example, coating a composition for forming an organic underlayer film.
- a method of forming the organic underlayer film by coating the composition for forming the organic underlayer film for example, the coating film formed by directly or indirectly applying the composition for forming the organic underlayer film to the substrate is heated or exposed. A method of curing or the like by performing the above can be mentioned.
- the composition for forming an organic underlayer film for example, "HM8006" of JSR Corporation can be used. The conditions for heating and exposure can be appropriately determined according to the type of the composition for forming an organic underlayer film to be used.
- Examples of the case where the organic underlayer film is indirectly formed on the substrate include the case where the organic underlayer film is formed on the low-dielectric insulating film formed on the substrate.
- composition coating process for forming a resist underlayer film In this step, the composition for forming a resist underlayer film is directly or indirectly applied to the substrate. By this step, a coating film of the composition for forming a resist underlayer film is directly or indirectly formed on the substrate. In this step, the above-mentioned composition for forming a resist underlayer film is used as the composition for forming a resist underlayer film.
- the substrate examples include an insulating film such as silicon oxide, silicon nitride, silicon oxynitride, and polysiloxane, and a resin substrate. Further, the substrate may be a substrate in which a wiring groove (trench), a plug groove (via), or the like is patterned.
- the coating method of the composition for forming a resist underlayer film is not particularly limited, and examples thereof include a rotary coating method.
- Examples of the case where the resist underlayer film forming composition is indirectly applied to the substrate include the case where the resist underlayer film forming composition is applied onto another film formed on the substrate.
- Examples of other films formed on the substrate include an organic underlayer film, an antireflection film, and a low-dielectric insulating film formed by the above-mentioned organic underlayer film forming step.
- the coating formed by the resist underlayer film forming composition coating step is performed after the resist underlayer film forming composition coating step and before the metal-containing resist film forming composition coating step described later. Heat the membrane. By this heating, the coating film is cured, and the resist underlayer film is formed.
- the atmosphere when heating the coating film is not particularly limited, and examples thereof include an atmosphere and a nitrogen atmosphere. Normally, the coating film is heated in the atmosphere. Various conditions such as the heating temperature and the heating time when heating the coating film can be appropriately determined.
- the lower limit of the heating temperature may be, for example, 150 ° C., preferably 200 ° C., more preferably 210 ° C. or 220 ° C. By setting the heating temperature to the above lower limit or higher, an amino group can be sufficiently generated.
- the upper limit of the heating temperature is preferably 550 ° C, more preferably 450 ° C, and even more preferably 300 ° C.
- the lower limit of the heating time is preferably 15 seconds, more preferably 30 seconds.
- the upper limit of the heating time is preferably 1,200 seconds, more preferably 600 seconds.
- composition for forming a resist underlayer film contains an acid generator as the [C] additive and the acid generator is an acid generator that generates an acid by exposure, it is possible to combine heating and exposure.
- the formation of the resist underlayer film can be promoted.
- the acid generator is an acid generator that generates an acid by heating, the acid is generated by the heating, and the curing reaction can be promoted.
- the lower limit of the average thickness of the resist underlayer film formed in this step is preferably 1 nm, more preferably 3 nm, and even more preferably 5 nm.
- the upper limit of the average thickness is preferably 300 nm, more preferably 100 nm, further preferably 50 nm, and even more preferably 20 nm.
- composition coating process for forming a metal-containing resist film In this step, the composition for forming a metal-containing resist film is directly or indirectly applied to the resist underlayer film formed by the above step. By this step, a metal-containing resist film is directly or indirectly formed on the resist underlayer film.
- the coating method of the composition for forming a metal-containing resist film is not particularly limited, and examples thereof include a rotary coating method.
- the resist composition is applied so that the metal-containing resist film to be formed has a predetermined thickness, and then the coating film is prebaked (hereinafter, also referred to as “PB”).
- a metal-containing resist film is formed by volatilizing the solvent inside.
- the PB temperature and PB time can be appropriately determined according to the type of the metal-containing resist film-forming composition used and the like.
- the lower limit of the PB temperature is preferably 30 ° C, more preferably 50 ° C.
- the upper limit of the PB temperature is preferably 200 ° C., more preferably 150 ° C.
- As the lower limit of the PB time 10 seconds is preferable, and 30 seconds is more preferable.
- the upper limit of the PB time is preferably 600 seconds, more preferably 300 seconds.
- composition for forming a metal-containing resist film used in this step examples include a composition for forming a metal-containing resist film containing a compound containing a metal atom (hereinafter, also referred to as “[P] metal-containing compound”).
- composition for forming a metal-containing resist film contains [P] metal-containing compound in an amount of 50% by mass or more in terms of solid content.
- the composition for forming a metal-containing resist film preferably further contains the [Q] solvent, and may further contain other components. Since the composition for forming a metal-containing resist film contains [P] metal-containing compound in an amount of 50% by mass or more in terms of solid content, a resist film having excellent etching resistance can be formed.
- the metal-containing compound is a compound containing a metal atom.
- the metal-containing compound may be used alone or in combination of two or more. Further, the metal atoms constituting the [P] metal-containing compound can be used alone or in combination of two or more.
- the "metal atom” is a concept including metalloids, that is, boron, silicon, germanium, arsenic, antimony and tellurium.
- the metal atom constituting the [P] metal-containing compound is not particularly limited, and examples thereof include metal atoms of groups 3 to 16. Specific examples of the metal atoms include Group 4 metal atoms such as titanium, zirconium, and hafnium, Group 5 metal atoms such as tantalum, Group 6 metal atoms such as chromium and tungsten, iron, ruthenium, and the like. Group 8 metal atoms, Group 9 metal atoms such as cobalt, Group 10 metal atoms such as nickel, Group 11 metal atoms such as copper, Group 12 metals such as zinc, cadmium, and mercury.
- Group 4 metal atoms such as titanium, zirconium, and hafnium
- Group 5 metal atoms such as tantalum
- Group 6 metal atoms such as chromium and tungsten, iron, ruthenium, and the like.
- Group 8 metal atoms, Group 9 metal atoms such as cobalt
- Group 10 metal atoms such as nickel
- Group 13 metal atoms such as boron, aluminum, gallium, indium, and tarium
- Group 14 metal atoms such as germanium, tin, and lead
- Group 15 metal atoms such as antimony and bismuth
- Group 15 metal atoms such as tellurium. Examples include Group 16 metal atoms.
- the metal atom constituting the metal-containing compound includes a first metal atom belonging to Group 4, Group 12, or Group 14 in the periodic table and belonging to the 4th, 5th, or 6th period. It is good. That is, the metal atom may contain at least one of titanium, zirconium, hafnium, zinc, cadmium, mercury, germanium, tin and lead.
- the [P] metal-containing compound contains the first metal atom, secondary electrons are emitted in the exposed portion of the resist film, and the [P] metal-containing compound is dissolved in the developing solution by the secondary electrons and the like. Sexual change is promoted more. As a result, pattern collapse can be suppressed more reliably.
- the first metal atom tin or zirconium is preferable.
- the metal-containing compound preferably further has an atom other than the metal atom.
- the other atoms include carbon atom, hydrogen atom, oxygen atom, nitrogen atom, phosphorus atom, sulfur atom, halogen atom and the like, and among these, carbon atom, hydrogen atom and oxygen atom are preferable.
- Other atoms in the metal-containing compound may be used alone or in combination of two or more.
- the lower limit of the content of the [P] metal-containing compound in terms of solid content in the radiation-sensitive composition for forming a resist film is preferably 70% by mass, more preferably 90% by mass, and even more preferably 95% by mass. Moreover, the said content may be 100% by mass.
- the solid content in the radiation-sensitive composition for forming a resist film means a component other than the [Q] solvent described later.
- the metal-containing compound is, for example, hydrolyzed and condensed with respect to, for example, a metal compound having a metal atom and a hydrolyzable group, a hydrolyzate of this metal compound, a hydrolyzed condensate of the above metal compound, or a combination thereof. It can be obtained by a method of performing a position exchange reaction or the like.
- the above metal compounds can be used alone or in combination of two or more.
- metal-containing compound (1) those derived from a metal compound having a metal atom represented by the following formula (4) and a hydrolyzable group (hereinafter, also referred to as "metal compound (1)") are preferable. By using such a metal compound (1), a stable [P] metal-containing compound can be obtained.
- M is a metal atom.
- L 1 is a ligand or a monovalent organic group having 1 to 20 carbon atoms. a1 is an integer of 0 to 6. If a1 is 2 or more, a plurality of L 1 may be the same or different.
- Y is a monovalent hydrolyzable group. b1 is an integer of 2 to 6. The plurality of Ys may be the same or different.
- L 1 is a ligand or an organic group that does not correspond to Y.
- the metal atom represented by M the first metal atom is preferable, and tin is more preferable.
- the hydrolyzable group represented by Y can be appropriately changed according to the metal atom represented by M, and for example, a substituted or unsubstituted ethynyl group, a halogen atom, an alkoxy group, an acyloxy group, a substituted or non-substituted group. Substituted amino groups and the like can be mentioned.
- a monovalent hydrocarbon group having 1 to 20 carbon atoms is preferable, and a chain hydrocarbon group is more preferable.
- Alkyl groups are more preferred.
- halogen atom represented by Y examples include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like. Of these, a chlorine atom is preferred.
- Examples of the alkoxy group represented by Y include a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group and the like. Of these, an ethoxy group, an i-propoxy group and an n-butoxy group are preferable.
- Examples of the asyloxy group represented by Y include formyl group, acetoxy group, ethylyloxy group, propionyloxy group, n-butyryloxy group, t-butyryloxy group, t-amylyloxy group, n-hexanecarbonyloxy group and n-octane. Examples thereof include a carbonyloxy group. Of these, the acetoxy group is preferred.
- Examples of the substituted or unsubstituted amino group represented by Y include an amino group, a methylamino group, a dimethylamino group, a diethylamino group, a dipropylamino group and the like. Of these, a dimethylamino group and a diethylamino group are preferable.
- the hydrolyzable group represented by Y includes a substituted or unsubstituted ethynyl group, a halogen atom, an alkoxy group, an asyloxy group and a substituted or unsubstituted amino group.
- a halogen atom is more preferred.
- the hydrolyzable group represented by Y is preferably a halogen atom, an alkoxy group, an asyloxy group, and a substituted or unsubstituted amino group.
- the hydrolyzable group represented by Y is preferably a halogen atom, an alkoxy group and an asyloxy group.
- Examples of the ligand represented by L 1 include a monodentate ligand and a polydentate ligand.
- Examples of the monodentate ligand include hydroxo ligand, nitro ligand, ammonia and the like.
- polydentate ligand examples include hydroxy acid esters, ⁇ -diketones, ⁇ -keto esters, malonic acid diesters in which the carbon atom at the ⁇ -position may be substituted, and hydrocarbons having a ⁇ bond, or compounds thereof.
- Derived ligands, diphosphine and the like can be mentioned.
- diphosphine examples include 1,1-bis (diphenylphosphino) methane, 1,2-bis (diphenylphosphino) ethane, 1,3-bis (diphenylphosphino) propane, and 2,2'-bis (diphenyl).
- Hosphino) -1,1'-binaphthyl, 1,1'-bis (diphenylphosphino) ferrocene and the like can be mentioned.
- Examples of the monovalent organic group represented by L 1 include the same groups as those exemplified as the monovalent organic group having 1 to 20 carbon atoms represented by R 1 in the above formula (1). .. As the lower limit of the number of carbon atoms of the monovalent organic group represented by L 1, 2 is preferable, and 3 is more preferable. On the other hand, as the upper limit of the number of carbon atoms, 10 is preferable, and 5 is more preferable. As the monovalent organic group represented by L 1 , a substituted or unsubstituted hydrocarbon group is preferable, and a substituted or unsubstituted chain hydrocarbon group or a substituted or unsubstituted aromatic hydrocarbon group is more preferable. Substituted or unsubstituted alkyl groups or substituted or unsubstituted aralkyl groups are more preferable, and i-propyl groups or benzyl groups are particularly preferable.
- 1 and 2 are preferable, and 1 is more preferable.
- an integer of 2 to 4 is preferable.
- the content ratio of metal atoms in the [P] metal-containing compound can be increased, and the generation of secondary electrons by the [P] metal-containing compound can be more effectively promoted. As a result, pattern collapse can be suppressed more reliably.
- metal compound (1) a metal halide compound is preferable, and isopropyltin trichloride or benzyltin trichloride is more preferable.
- the metal compound (1) is water or a solvent containing water.
- a method of stirring the mixture and the like can be mentioned.
- other compounds having a hydrolyzable group may be added if necessary.
- the lower limit of the amount of water used in this hydrolysis condensation reaction 0.2 times by mole is preferable, 1 times by mole is more preferable, and 3 times by mole is further compared with respect to the hydrolyzable group of the metal compound (1) and the like. preferable.
- the compounds and crosslinking ligand which can be a multidentate ligand represented by L 1 in the compound of the formula (4) A possible compound or the like may be added.
- the compound that can be the bridging ligand include a compound having two or more coordinating groups such as a hydroxy group, an isocyanate group, an amino group, an ester group, and an amide group.
- 0 ° C. is preferable, and 10 ° C. is more preferable.
- the upper limit of the temperature is preferably 150 ° C, more preferably 100 ° C, and even more preferably 50 ° C.
- an organic solvent is preferable.
- this organic solvent include those similar to those exemplified as the [B] solvent in the above-mentioned composition for forming a resist underlayer film.
- an alcohol solvent is preferable, a monoalcohol solvent is more preferable, and 4-methyl-2-pentanol is further preferable.
- the radiation-sensitive composition for forming a resist film may contain other optional components such as a compound that can be a ligand and a surfactant.
- Examples of the compound that can be the ligand include a polydentate ligand and a compound that can be a bridging ligand.
- the polydentate ligand exemplified in the method for synthesizing the [P] metal-containing compound.
- the same compounds as those that can serve as a bridging ligand can be mentioned.
- Surfactants are components that have the effect of improving coating properties, striations, and the like.
- examples of the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene n-octylphenyl ether, polyoxyethylene n-nonylphenyl ether, polyethylene glycol dilaurate, and polyethylene glycol di.
- nonionic surfactants such as stearate, KP341 (Shin-Etsu Chemical Industry Co., Ltd.), Polyflow No. 75, No.
- the radiation-sensitive composition for forming a resist film is preferably a mixture obtained by mixing, for example, a [P] metal-containing compound and, if necessary, other optional components such as a [Q] solvent in a predetermined ratio. Can be prepared by filtering with a membrane filter having a pore size of about 0.2 ⁇ m.
- the lower limit of the solid content concentration of the radiation-sensitive composition for forming a resist film is preferably 0.1% by mass, preferably 0.5% by mass. Is more preferable, 1% by mass is further preferable, and 2% by mass is particularly preferable.
- the upper limit of the solid content concentration is preferably 50% by mass, more preferably 30% by mass, further preferably 15% by mass, and particularly preferably 4% by mass.
- the metal-containing resist film formed by the above-mentioned metal-containing resist film-forming composition coating step is exposed to electron beam or extreme ultraviolet rays (wavelength 13.5 nm, etc., also referred to as “EUV”).
- EUV extreme ultraviolet rays
- the metal-containing resist film is irradiated with an electron beam or extreme ultraviolet rays, for example, through a mask having a predetermined pattern.
- This step causes a difference in solubility in the developing solution between the exposed portion and the non-exposed portion of the metal-containing resist film.
- the exposure conditions can be appropriately determined depending on the type of the metal-containing resist film-forming composition to be used and the like.
- PEB post-exposure baking
- the PEB temperature and PEB time can be appropriately determined depending on the type of the metal-containing resist film-forming composition used and the like.
- the lower limit of the PEB temperature is preferably 50 ° C., more preferably 70 ° C.
- the upper limit of the PEB temperature is preferably 200 ° C., more preferably 150 ° C.
- As the lower limit of the PEB time 10 seconds is preferable, and 30 seconds is more preferable.
- the upper limit of the PEB time is preferably 600 seconds, more preferably 300 seconds.
- the exposed metal-containing resist film is developed.
- the developing solution used for this development include an alkaline aqueous solution (alkaline developing solution), an organic solvent-containing solution (organic solvent developing solution), and the like.
- alkaline developing solution an organic solvent-containing solution
- organic solvent developing solution organic solvent developing solution
- the solubility of the exposed part in the metal-containing resist film in the alkaline aqueous solution is increased. Therefore, the exposed part is removed by performing the alkaline development, so that the positive type is used.
- the resist pattern is formed.
- the solubility of the exposed part in the metal-containing resist film in the organic solvent is lowered, so that the solubility in the organic solvent can be improved by developing the organic solvent.
- a negative resist pattern is formed by removing relatively high non-exposed areas.
- alkaline aqueous solution examples include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, and the like.
- TMAH tetramethylammonium hydroxide
- the lower limit of the content ratio of the alkaline compound in the alkaline aqueous solution is preferably 0.1% by mass, more preferably 0.5% by mass, still more preferably 1% by mass.
- the upper limit of the content ratio is preferably 20% by mass, more preferably 10% by mass, and even more preferably 5% by mass.
- TMAH aqueous solution As the alkaline aqueous solution, a TMAH aqueous solution is preferable, and a 2.38 mass% TMAH aqueous solution is more preferable.
- organic solvent contained in the organic solvent-containing liquid organic solvent developer
- organic solvent developer a known organic solvent used for organic solvent development can be used.
- the same solvent as that exemplified as the solvent [B] in the above-mentioned composition for forming a resist underlayer film can be mentioned.
- an ester solvent, an ether solvent, an alcohol solvent, a ketone solvent and / or a hydrocarbon solvent is preferable, a ketone solvent is more preferable, and 2-heptanone is particularly preferable.
- the lower limit of the content ratio of the organic solvent in the organic solvent-containing liquid is preferably 80% by mass, more preferably 90% by mass, further preferably 95% by mass, and particularly preferably 99% by mass.
- These developers may be used alone or in combination of two or more. After development, it is generally washed and dried.
- This step is a step of performing etching using a resist pattern or the like as a mask.
- the number of times of etching may be once or a plurality of times, that is, the pattern obtained by etching may be used as a mask for sequential etching, but from the viewpoint of obtaining a pattern having a better shape, a plurality of times is preferable.
- etching a plurality of times for example, if the organic underlayer film is not provided, the resist underlayer film and the substrate are etched in this order, and if the organic underlayer film is present, the resist underlayer film, the organic underlayer film, and the substrate are etched in this order. Etching is performed sequentially.
- Examples of the etching method include dry etching and wet etching. Among these, dry etching is preferable from the viewpoint of improving the shape of the pattern of the substrate.
- a fluorine-based gas, an oxygen-based gas, or the like is appropriately selected depending on the material of the mask and the layer to be etched.
- a fluorine-based gas is usually used for dry etching of a resist underlayer film (silicon-containing film) using a resist pattern as a mask, and a mixture of an oxygen-based gas and an inert gas is preferably used.
- An oxygen-based gas is usually used for dry etching of an organic underlayer film using a resist underlayer film (silicon-containing film) pattern as a mask.
- the same gas or the like as for the dry etching of the resist underlayer film (silicon-containing film) is used. After the etching, a patterning substrate having a predetermined pattern is obtained.
- the weight average molecular weight (Mw) of the [A] compound, the concentration of the [A] compound in the solution, and the average thickness of the film in this example were measured by the following methods.
- Average thickness of film The average thickness of the membrane was measured using a spectroscopic ellipsometer (“M2000D” from JA WOOLLAM).
- the inside of the reaction vessel was cooled to 30 ° C. or lower. After adding 375 parts by mass of propylene glycol monoethyl ether to the cooled reaction solution, water, alcohols produced by the reaction and excess propylene glycol monoethyl ether were removed using an evaporator to remove compound (A-1). Propylene glycol monoethyl ether solution was obtained.
- the Mw of compound (A-1) was 1,800.
- the concentration of compound (A-1) in the propylene glycol monoethyl ether solution was 10.0% by mass.
- the reaction was started at the end of the dropping, and the reaction was carried out at 40 ° C. for 1 hour and then at 60 ° C. for 3 hours. Then, 213 parts by mass of tetrahydrofuran was added and the mixture was cooled to 10 ° C. or lower to obtain a polymerization reaction solution. Next, 96.84 parts by mass of triethylamine was added to this polymerization reaction solution, and then 30.66 parts by mass of methanol was added dropwise over 10 minutes with stirring. The reaction was started at the end of the dropping, and the reaction was carried out at 20 ° C. for 1 hour. Then, the reaction solution was poured into 700 parts by mass of diisopropyl ether, and the precipitated salt was filtered off.
- B-1 Propylene glycol monoethyl ether
- B-2 Propylene glycol monomethyl ether acetate
- C-1 Compound represented by the following formula (C-1)
- C-2 Compound represented by the following formula (C-2)
- C-3 Compound represented by the following formula (C-3)
- Example 1-1 [A] 0.5 parts by mass of (A-1) as a compound (excluding the solvent), [B] 95.5 parts by mass of (B-1) as a solvent (included in the solution of the [A] compound. (Including (B-1) as a solvent) and 4 parts by mass of water (including water contained in the solution of the compound [A]) are mixed, and the obtained solution is mixed with PTFE (polytetrafluoroethylene) having a pore size of 0.2 ⁇ m. ) A composition for forming a resist underlayer film (J-1) was prepared by filtering with a filter.
- Examples 1-2 to 1-14, Comparative Examples 1-1 to 1-2, and Reference Examples 1-1 to 1-2 The compositions (J-2) to (J-14) and (j-1) to (j) are operated in the same manner as in Example 1 except that the components of the types and blending amounts shown in Table 2 below are used. -4) was prepared. “-” In Table 2 below indicates that the corresponding component was not used.
- Compound (S-3) is a particle containing a metal oxide of tin as a main component and containing methacrylic acid.
- Compound (S-4) is a particle containing a metal oxide of zirconium as a main component and containing methacrylic acid.
- composition for forming metal-containing resist film [Preparation of composition for forming metal-containing resist film] [Preparation Example 2-1] 2 parts by mass of the synthesized compound (S-1) and 98 parts by mass of propylene glycol monoethyl ether were mixed, and the obtained mixture was activated to remove residual water with a 4 ⁇ molecular sieve, and then the pore size was 0.2 ⁇ m.
- the composition for forming a metal-containing resist film (K-1) was prepared by filtering with a filter.
- Preparation Example 2-2 2 parts by mass of the synthesized compound (S-2) and 98 parts by mass of propylene glycol monoethyl ether are mixed, and the obtained solution is filtered through a filter having a pore size of 0.2 ⁇ m to form a composition for forming a metal-containing resist film.
- the product (K-2) was prepared.
- An organic underlayer film forming material (JSR Corporation "HM8006") is coated on a 12-inch silicon wafer by a rotary coating method using a spin coater (Tokyo Electron Limited "CLEAN TRACK ACT12”), and then 250.
- An organic underlayer film having an average thickness of 100 nm was formed by heating at ° C. for 60 seconds.
- the above-prepared resist underlayer film forming composition was applied onto the organic underlayer film, heated at 220 ° C. for 60 seconds, and then cooled at 23 ° C. for 30 seconds to form a resist underlayer film having an average thickness of 10 nm. ..
- composition for forming a metal-containing resist film shown in Table 3 below is applied onto the resist underlayer film by the rotary coating method using the spin coater, and then heated at 90 ° C. for 60 seconds after a lapse of a predetermined time. Then, a metal-containing resist film having an average thickness of 35 nm was formed by cooling at 23 ° C. for 30 seconds.
- Metal-containing resist film using an EUV scanner ASML "TWINSCAN NXE: 3300B" (NA0.3, Sigma 0.9, quadrupole illumination, 1: 1 line-and-space mask with line width 25 nm on wafer)
- the substrate was heated at 110 ° C. for 60 seconds and then cooled at 23 ° C. for 60 seconds.
- Resist pattern collapse inhibitory property If no collapse of the resist pattern of the line with a line width of 18 nm is confirmed, "A" (extremely good) is displayed. When the collapse of the resist pattern of the line with a line width of 18 nm was confirmed, but the collapse of the resist pattern of the line with a line width of 24 nm was not confirmed, "B" (good) was displayed. When the collapse of the resist pattern of the line having a line width of 24 nm was confirmed, it was evaluated as "C" (defective).
- each resist underlayer film forming composition of the examples had a good resist pattern collapse inhibitory property.
- composition for forming a resist underlayer film of the present invention can be suitably used for manufacturing a semiconductor substrate or the like.
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Abstract
Description
当該レジスト下層膜形成用組成物は、[A]化合物と[B]溶媒とを含有する。当該レジスト下層膜形成用組成物は、本発明の効果を損なわない範囲において、[A]化合物及び[B]溶媒以外のその他の添加剤(以下、「[C]添加剤」ともいう。)を含有していてもよい。
[A]化合物は、後述する下記式(1)で表される第1構造単位(以下、「構造単位(I)」ともいう。)を有するポリシロキサン化合物である。本明細書において「ポリシロキサン化合物」とは、シロキサン結合(-Si-O-Si-)を含む化合物を意味する。[A]化合物は、本発明の効果を損なわない範囲において、上記構造単位(I)以外の他の構造単位を有していてもよい。他の構造単位としては、例えば後述する下記式(2)で表される第2構造単位(以下、「構造単位(II)」ともいう。)、後述する下記式(3)で表される第3構造単位(以下、「構造単位(III)」ともいう。)等が挙げられる。
構造単位(I)は、下記式(1)で表される構造単位である。[A]化合物は、1種又は2種以上の構造単位(I)を有することができる。
構造単位(II)は、下記式(2)で表される構造単位である。[A]化合物が構造単位(II)を有する場合、当該レジスト下層膜形成用組成物により形成されるレジスト下層膜の酸素ガスエッチング耐性を向上させることができる。[A]化合物は、1種又は2種以上の構造単位(II)を有することができる。
構造単位(III)は、下記式(3)で表される構造単位である。[A]化合物が構造単位(III)を有する場合、当該レジスト下層膜形成用組成物の保存安定性及び塗工性を向上させることができる。[A]化合物は、1種又は2種以上の構造単位(III)を有することができる。
溶離液:テトラヒドロフラン
流量:1.0mL/分
試料濃度:1.0質量%
試料注入量:100μL
カラム温度:40℃
検出器:示差屈折計
標準物質:単分散ポリスチレン
[B]溶媒としては特に制限されず、例えばアルコール系溶媒、ケトン系溶媒、エーテル系溶媒、エステル系溶媒、含窒素系溶媒等が挙げられる。[B]溶媒は、通常、有機溶媒である。当該レジスト下層膜形成用組成物は、1種又は2種以上の[B]溶媒を含有することができる。
[C]添加剤としては、例えば酸発生剤、塩基性化合物(塩基発生剤を含む)、ラジカル発生剤、界面活性剤、コロイド状シリカ、コロイド状アルミナ、有機ポリマー、水等が挙げられる。当該レジスト下層膜形成用組成物は、1種又は2種以上の[C]添加剤を含有することができる。
当該レジスト下層膜形成用組成物の調製方法としては特に限定されず、常法に従って調製することができる。例えば[A]化合物の溶液と、[B]溶媒と、必要に応じて[C]添加剤とを所定の割合で混合し、好ましくは得られた混合溶液を孔径0.2μm以下のフィルター等でろ過することにより調製することができる。
当該半導体基板の製造方法は、基板に直接又は間接にレジスト下層膜形成用組成物を塗工する工程(以下、「レジスト下層膜形成用組成物塗工工程」ともいう。)と、上記レジスト下層膜形成用組成物塗工工程により形成されたレジスト下層膜に直接又は間接に金属含有レジスト膜形成用組成物を塗工する工程(以下、「金属含有レジスト膜形成用組成物塗工工程」ともいう)と、上記金属含有レジスト膜形成用組成物塗工工程により形成された金属含有レジスト膜を電子線又は極端紫外線により露光する工程(以下、「露光工程」ともいう)と、上記露光された金属含有レジスト膜を現像する工程(以下、「現像工程」ともいう)とを備える。当該半導体基板の製造方法では、レジスト下層膜形成用組成物として上述の当該レジスト下層膜形成用組成物を用いる。
本工程では、後述するレジスト下層膜形成用組成物塗工工程前に、後述する基板に直接又は間接に有機下層膜を形成する。本工程は、任意の工程である。本工程により、基板に直接又は間接に有機下層膜が形成される。なお、「上記レジスト下層膜形成用組成物塗工工程前」とは、レジスト下層膜形成用組成物塗工工程の直前のみを意味するのではなく、レジスト下層膜形成用組成物塗工工程よりも川上の時点を意味する。したがって、本工程とレジスト下層膜形成用組成物塗工工程との間にその他の任意の工程を備えていてもよい。
本工程では、基板に直接又は間接にレジスト下層膜形成用組成物を塗工する。本工程により、基板上に直接又は間接にレジスト下層膜形成用組成物の塗工膜が形成される。本工程では、レジスト下層膜形成用組成物として上述の当該レジスト下層膜形成用組成物を用いる。
本工程では、上記レジスト下層膜形成用組成物塗工工程後、後述する金属含有レジスト膜形成用組成物塗工工程前に、上記レジスト下層膜形成用組成物塗工工程により形成された塗工膜を加熱する。この加熱により、塗工膜が硬化することなどにより、レジスト下層膜が形成される。
本工程では、上記工程により形成されたレジスト下層膜に直接又は間接に金属含有レジスト膜形成用組成物を塗工する。本工程により、レジスト下層膜上に直接又は間接に金属含有レジスト膜が形成される。
金属含有レジスト膜形成用組成物は、[P]金属含有化合物を固形分換算で50質量%以上含有する。金属含有レジスト膜形成用組成物は、[Q]溶媒をさらに含有することが好ましく、その他の成分をさらに含有してもよい。金属含有レジスト膜形成用組成物は、[P]金属含有化合物を固形分換算で50質量%以上含有するため、エッチング耐性に優れるレジスト膜を形成できる。
[P]金属含有化合物は、金属原子を含有する化合物である。[P]金属含有化合物は、1種単独で又は2種以上を組み合わせて用いることができる。また、[P]金属含有化合物を構成する金属原子は、1種単独で又は2種以上を組み合わせて用いることができる。ここで「金属原子」とは、半金属、すなわちホウ素、ケイ素、ゲルマニウム、ヒ素、アンチモン及びテルルを含む概念である。
[P]金属含有化合物は、例えば金属原子及び加水分解性基を有する金属化合物、この金属化合物の加水分解物、上記金属化合物の加水分解縮合物又はこれらの組み合わせに対し、加水分解縮合反応、配位子交換反応等を行う方法により得ることができる。上記金属化合物は、1種単独で又は2種以上組み合わせて使用できる。
[Q]溶媒としては、有機溶媒が好ましい。この有機溶媒の具体例としては、例えば上述のレジスト下層膜形成用組成物において[B]溶媒として例示したものと同様のもの等が挙げられる。
レジスト膜形成用感放射線性組成物は、[P]金属含有化合物及び[Q]溶媒以外にも、配位子となり得る化合物、界面活性剤等のその他の任意成分を含有してもよい。
上記配位子となり得る化合物としては、例えば多座配位子又は架橋配位子となり得る化合物等が挙げられ、具体的には[P]金属含有化合物の合成方法において例示した多座配位子又は架橋配位子となり得る化合物と同様のもの等が挙げられる。
界面活性剤は塗布性、ストリエーション等を改良する作用を示す成分である。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オレイルエーテル、ポリオキシエチレンn-オクチルフェニルエーテル、ポリオキシエチレンn-ノニルフェニルエーテル、ポリエチレングリコールジラウレート、ポリエチレングリコールジステアレート等のノニオン系界面活性剤の他、以下商品名として、KP341(信越化学工業社)、ポリフローNo.75、同No.95(以上、共栄社化学社)、エフトップEF301、同EF303、同EF352(以上、トーケムプロダクツ社)、メガファックF171、同F173(以上、大日本インキ化学工業社)、フロラードFC430、同FC431(以上、住友スリーエム社)、アサヒガードAG710、サーフロンS-382、同SC-101、同SC-102、同SC-103、同SC-104、同SC-105、同SC-106(以上、旭硝子社)等が挙げられる。
レジスト膜形成用感放射線性組成物は、例えば[P]金属含有化合物と、必要に応じて[Q]溶媒等のその他の任意成分とを所定の割合で混合し、好ましくは、得られた混合物を孔径0.2μm程度のメンブランフィルターで濾過することにより調製できる。レジスト膜形成用感放射線性組成物が[Q]溶媒を含有する場合、レジスト膜形成用感放射線性組成物の固形分濃度の下限としては、0.1質量%が好ましく、0.5質量%がより好ましく、1質量%がさらに好ましく、2質量%が特に好ましい。一方、上記固形分濃度の上限としては、50質量%が好ましく、30質量%がより好ましく、15質量%がさらに好ましく、4質量%が特に好ましい。
本工程では、上記金属含有レジスト膜形成用組成物塗工工程により形成された金属含有レジスト膜を電子線又は極端紫外線(波長13.5nm等、「EUV」ともいう)により露光する。具体的には、例えば所定のパターンを有するマスクを介して、電子線又は極端紫外線を金属含有レジスト膜に照射する。本工程により、金属含有レジスト膜における露光部と非露光部との間で現像液への溶解性に差異が生じる。露光条件は、用いる金属含有レジスト膜形成用組成物の種類等に応じて適宜決定することができる。
本工程では、上記露光された金属含有レジスト膜を現像する。この現像に用いる現像液としては、アルカリ水溶液(アルカリ現像液)、有機溶媒含有液(有機溶媒現像液)等が挙げられる。例えばアルカリ現像液を用いたポジ型の場合、金属含有レジスト膜における露光部のアルカリ水溶液への溶解性が高まっていることから、アルカリ現像を行うことで露光部が除去されることにより、ポジ型のレジストパターンが形成される。また、有機溶媒現像液を用いたネガ型の場合、金属含有レジスト膜における露光部の有機溶媒への溶解性が低下していることから、有機溶媒現像を行うことで有機溶媒への溶解性が相対的に高い非露光部が除去されることにより、ネガ型のレジストパターンが形成される。
本工程は、レジストパターン等をマスクとしてエッチングを行う工程である。エッチングの回数としては1回でも、複数回、すなわちエッチングにより得られるパターンをマスクとして順次エッチングを行ってもよいが、より良好な形状のパターンを得る観点からは、複数回が好ましい。複数回のエッチングを行う場合、例えば、上記有機下層膜を有さない場合はレジスト下層膜、基板の順に順次エッチングし、上記有機下層膜を有する場合はレジスト下層膜、有機下層膜、基板の順に順次エッチングを行う。エッチングの方法としては、ドライエッチング、ウエットエッチング等が挙げられる。これらの中で、基板のパターンの形状をより良好なものとする観点から、ドライエッチングが好ましい。エッチングガスとしては、フッ素系ガス、酸素系ガス等が、マスク及びエッチングされる層の材質に応じて適宜選択される。例えば、レジストパターンをマスクとしたレジスト下層膜(ケイ素含有膜)のドライエッチングには、通常フッ素系ガスが用いられ、これに酸素系ガスと不活性ガスとを混合したものが好適に用いられる。レジスト下層膜(ケイ素含有膜)パターンをマスクとした有機下層膜のドライエッチングには、通常、酸素系ガスが用いられる。有機下層膜パターンをマスクとした基板のドライエッチングには、レジスト下層膜(ケイ素含有膜)のドライエッチングと同様のガス等が用いられる。上記エッチングの後、所定のパターンを有するパターニング基板が得られる。
[A]化合物の重量平均分子量(Mw)は、ゲルパーミエーションクロマトグラフィー(GPC)により、東ソー(株)のGPCカラム(「G2000HXL」2本、「G3000HXL」1本及び「G4000HXL」1本)を使用し以下の条件により測定した。
溶離液:テトラヒドロフラン
流量:1.0mL/分
試料濃度:1.0質量%
試料注入量:100μL
カラム温度:40℃
検出器:示差屈折計
標準物質:単分散ポリスチレン
[A]化合物の溶液0.5gを250℃で30分間焼成して得られた残渣の質量を測定し、この残渣の質量を[A]化合物の溶液の質量で除することにより、[A]化合物の溶液の濃度(単位:質量%)を算出した。
膜の平均厚みは、分光エリプソメータ(J.A.WOOLLAM社の「M2000D」)を用いて測定した。
[A]化合物の合成に使用した単量体(以下、「単量体(M-1)~(M-13)」ともいう。)を以下に示す。以下の合成例、皮革合成例及び参考合成例においては特に断りのない限り、質量部は使用した単量体の合計質量を100質量部とした場合の値を意味し、モル%は使用した単量体の合計モル数を100モル%とした場合の値を意味する。
反応容器において、上記単量体(M-1)及び単量体(M-4)(合計100質量部)をモル比率が90/10(モル%)となるようプロピレングリコールモノエチルエーテル53質量部に溶解し、単量体溶液を調製した。上記反応容器内を5℃とし、撹拌しながら、9.1質量%シュウ酸水溶液49質量部を20分間かけて滴下した。滴下終了後、反応容器内を40℃に加熱し、反応を4時間実施した。反応終了後、水を98質量部加え、攪拌を1時間実施した。攪拌終了後、反応容器内を30℃以下に冷却した。冷却した反応溶液にプロピレングリコールモノエチルエーテルを375質量部加えた後、エバポレーターを用いて、水、反応により生成したアルコール類及び余剰のプロピレングリコールモノエチルエーテルを除去して、化合物(A-1)のプロピレングリコールモノエチルエーテル溶液を得た。化合物(A-1)のMwは1,800であった。化合物(A-1)の上記プロピレングリコールモノエチルエーテル溶液中の濃度は、10.0質量%であった。
下記表1に示す種類及び使用量(モル%)の各単量体を使用した以外は、合成例1と同様にして、化合物(A-2)~(A-12)及び化合物(a-1)~(a-2)のプロピレングリコールモノエチルエーテル溶液を得た。得られた[A]化合物のMw及び[A]化合物の上記プロピレングリコールモノエチルエーテル溶液中の濃度(質量%)を下記表1に合わせて示す。下記表1における「-」は、該当する単量体を使用しなかったことを示す。
窒素置換した反応容器に、マグネシウム18.61質量部及びテトラヒドロフラン35質量部を加え、20℃で撹拌した。次に、ジブロモメタン、トリクロロメチルシラン及びトリクロロヒドロシラン(合計100質量部)をモル比率が50/15/35(モル%)となるようテトラヒドロフラン355質量部に溶解し、単量体溶液を調製した。反応容器内を20℃とし、攪拌しながら上記単量体溶液を1時間かけて滴下した。滴下終了時を反応の開始時間とし、40℃で1時間、その後60℃で3時間反応させた後、テトラヒドロフラン213質量部を添加し、10℃以下に冷却し、重合反応液を得た。次いで、この重合反応液にトリエチルアミン96.84質量部を加えた後、撹拌しながら、メタノール30.66質量部を10分かけて滴下した。滴下終了時を反応の開始時間とし、20℃で1時間反応させた後、反応液をジイソプロピルエーテル700質量部中に投入し、析出した塩をろ別した。次に、エバポレーターを用いて、ろ液中のテトラヒドロフラン、余剰のトリエチルアミン及び余剰のメタノールを除去した。得られた残渣をジイソプロピルエーテル180質量部中に投入し、析出した塩をろ別し、ろ液にジイソプロピルエーテルを添加することで223gのポリカルボシラン(aa-3)のジイソプロピルエーテル溶液を得た。ポリカルボシラン(aa-3)のMwは700であった。
上記参考合成例1におけるジブロモメタン、トリクロロメチルシラン及びトリクロロヒドロシラン(モル比率:50/15/35(モル%)、合計100質量部)をジブロモメタン、テトラクロロシラン、トリクロロメチルシラン及びトリクロロヒドロシラン(モル比率:50/5/15/30(モル%)、合計100質量部)とした以外は、上記参考合成例1と同様にして、化合物(a-4)の酢酸プロピレングリコールモノメチルエーテル溶液を得た。化合物(a-4)のMwは2,100であった。この化合物(a-4)の酢酸プロピレングリコールモノメチルエーテル溶液の濃度は5質量%であった。
レジスト下層膜形成用組成物の調製に用いた[B]溶媒及び[C]添加剤について以下に示す。
B-1:プロピレングリコールモノエチルエーテル
B-2:酢酸プロピレングリコールモノメチルエーテル
C-1:下記式(C-1)で表される化合物
C-2:下記式(C-2)で表される化合物
C-3:下記式(C-3)で表される化合物
[A]化合物としての(A-1)0.5質量部(但し、溶媒を除く)、[B]溶媒としての(B-1)95.5質量部([A]化合物の溶液に含まれる溶媒としての(B-1)も含む)及び水4質量部([A]化合物の溶液に含まれる水も含む)を混合し、得られた溶液を孔径0.2μmのPTFE(ポリテトラフルオロエチレン)フィルターでろ過して、レジスト下層膜形成用組成物(J-1)を調製した。
下記表2に示す種類及び配合量の各成分を用いた以外は、実施例1と同様に操作して、組成物(J-2)~(J-14)及び(j-1)~(j-4)を調製した。下記表2中の「-」は、該当する成分を使用しなかったことを示す。
金属含有レジスト膜形成用組成物の調製に用いる化合物(S-1)~(S-4)を、以下に示す手順により合成した。
反応容器内において、150mLの0.5N水酸化ナトリウム水溶液を攪拌しながら、イソプロピルスズ三塩化物6.5質量部を添加し、反応を2時間実施した。析出した沈殿物をろ取し、50質量部の水で2回洗浄した後、乾燥させ、化合物(S-1)を得た。化合物(S-1)は、イソプロピルスズ三塩化物の加水分解物の酸化水酸化物生成物(i-PrSnO(3/2-x/2)(OH)x(0<x<3)を構造単位とする)である。
反応容器内において、100mLの0.5M水酸化テトラメチルアンモニウム水溶液を攪拌しながら、ベンジルスズ三塩化物3.16質量部を添加し、反応を2時間実施した。析出した沈殿物をろ取し、50質量部の水で2回洗浄した後、乾燥させ、化合物(S-2)を得た。化合物(S-2)は、((PhCH2)SnO3/2)で表される構造単位を有する化合物である。
反応容器内において、テトラブトキシスズ(IV)20.0質量部、テトラヒドロフラン100質量部及びメタクリル酸100質量部を添加し、反応を65℃で20分間実施した。次に、水10.6質量部を10分間かけて滴下し、反応を65℃で18時間実施した。次いで、水10.6質量部を10分かけて滴下し、2時間撹拌した。冷却した反応液に水400質量部を添加し、析出物を得た。得られた析出物を遠心分離した後、アセトン50質量部に溶解し、水400質量部を添加し、析出物を得た。得られた析出物を遠心分離した後、乾燥させ、化合物(S-3)を得た。化合物(S-3)は、スズの金属酸化物を主成分とし、メタクリル酸を含む粒子である。
反応容器内において、テトライソプロポキシジルコニウム(IV)20.0質量部、テトラヒドロフラン100質量部及びメタクリル酸100質量部を添加し、反応を65℃で20分間実施した。次に、水10.6質量部を10分間かけて滴下し、反応を65℃で18時間実施した。次いで、水10.6質量部を10分かけて滴下し、2時間撹拌した。冷却した反応液に水400質量部を添加し、析出物を得た。得られた析出物を遠心分離した後、アセトン50質量部に溶解し、水400質量部を添加し、析出物を得た。得られた析出物を遠心分離した後、乾燥させ、化合物(S-4)を得た。化合物(S-4)は、ジルコニウムの金属酸化物を主成分とし、メタクリル酸を含む粒子である。
[調製例2-1]
上記合成した化合物(S-1)2質量部と、プロピレングリコールモノエチルエーテル98質量部とを混合し、得られた混合物を活性化4Åモレキュラーシーブにより残留水を除去した後、孔径0.2μmのフィルターでろ過して、金属含有レジスト膜形成用組成物(K-1)を調製した。
上記合成した化合物(S-2)2質量部と、プロピレングリコールモノエチルエーテル98質量部とを混合し、得られた溶液を孔径0.2μmのフィルターでろ過して、金属含有レジスト膜形成用組成物(K-2)を調製した。
上記合成した化合物(S-3)2質量部と、プロピレングリコールモノエチルエーテル98質量部、N-トリフルオロメタンスルホニルオキシ-5-ノルボルネン-2,3-ジカルボキシイミド0.2質量部とを混合し、得られた溶液を孔径0.2μmのフィルターでろ過して、金属含有レジスト膜形成用組成物(K-3)を調製した。
上記合成した化合物(S-4)2質量部と、プロピレングリコールモノエチルエーテル98質量部と、N-トリフルオロメタンスルホニルオキシ-5-ノルボルネン-2,3-ジカルボキシイミド0.2質量部とを混合し、得られた溶液を孔径0.2μmのフィルターでろ過して、金属含有レジスト膜形成用組成物(K-4)を調製した。
[実施例2-1~2-29、比較例2-1~比較例2-8及び参考例1-1~1-2]
調製した各レジスト下層膜形成用組成物及び調製した各金属含有レジスト膜形成用組成物を用いて、以下の方法により、レジストパターンの倒壊抑制性を評価した。評価結果を下記表3に示す。
12インチシリコンウェハ上に、有機下層膜形成用材料(JSR(株)の「HM8006」)をスピンコーター(東京エレクトロン(株)の「CLEAN TRACK ACT12」)による回転塗工法により塗工した後、250℃で60秒間加熱を行うことにより平均厚み100nmの有機下層膜を形成した。この有機下層膜上に、上記調製したレジスト下層膜形成用組成物を塗工し、220℃で60秒間加熱した後、23℃で30秒間冷却することにより平均厚み10nmのレジスト下層膜を形成した。このレジスト下層膜上に、下記表3に示す金属含有レジスト膜形成用組成物を、上記スピンコーターによる回転塗工法により塗工してから、所定の時間経過後に、90℃で60秒間加熱してから、23℃で30秒間冷却することにより平均厚み35nmの金属含有レジスト膜を形成した。 EUVスキャナー(ASML社の「TWINSCAN NXE:3300B」(NA0.3、シグマ0.9、クアドルポール照明、ウェハ上寸法が線幅25nmの1対1ラインアンドスペースのマスク)を用いて金属含有レジスト膜に露光を行った。露光後、基板を110℃で60秒間加熱し、次いで23℃で60秒間冷却した。その後、2-ヘプタノン(20~25℃)を用い、パドル法により現像した後、乾燥することにより、レジストパターンが形成された評価用基板を得た。上記評価用基板のレジストパターンの測長及び観察には走査型電子顕微鏡((株)日立ハイテクの「CG-6300」)を用いた。
線幅18nmのラインのレジストパターンの倒壊が確認されなかった場合は「A」(極めて良好)と、
線幅18nmのラインのレジストパターンの倒壊が確認されたが、線幅24nmのラインのレジストパターンの倒壊が確認されなかった場合は「B」(良好)と、
線幅24nmのラインのレジストパターンの倒壊が確認された場合は「C」(不良)と評価した。
Claims (5)
- 電子線又は極端紫外線リソグラフィーにおける金属含有レジスト膜の下層膜を形成するために用いられるレジスト下層膜形成用組成物であって、
下記式(1)で表される第1構造単位を有するポリシロキサン化合物と、
溶媒と
を含有するレジスト下層膜形成用組成物。
(式(1)中、Xは、ヒドロキシ基、カルボニル基及びエーテル結合からなる群から選ばれる少なくとも1つの構造を有する有機基である。aは、1~3の整数である。aが2以上の場合、複数のXは互いに同一又は異なる。R1は、炭素数1~20の1価の有機基、ヒドロキシ基又はハロゲン原子である。但し、R1は、X以外の基である。bは、0~2の整数である。bが2の場合、2つのR1は互いに同一又は異なる。但し、a+bは3以下である。) - 上記ポリシロキサン化合物を構成する全構造単位に対する上記第1構造単位の含有割合が1モル%以上40モル%以下である請求項1又は請求項2に記載のレジスト下層膜形成用組成物。
- 基板に直接又は間接に請求項1、請求項2又は請求項3に記載のレジスト下層膜形成用組成物を塗工する工程と、
上記レジスト下層膜形成用組成物塗工工程により形成されたレジスト下層膜に金属含有レジスト膜形成用組成物を塗工する工程と、
上記金属含有レジスト膜形成用組成物塗工工程により形成された金属含有レジスト膜を電子線又は極端紫外線により露光する工程と、
上記露光された金属含有レジスト膜を現像する工程と
を備える、半導体基板の製造方法。 - 上記レジスト下層膜形成用組成物塗工工程前に、
上記基板に直接又は間接に有機下層膜を形成する工程
をさらに備える請求項4に記載の半導体基板の製造方法。
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| JP2023094359A (ja) * | 2021-12-23 | 2023-07-05 | 信越化学工業株式会社 | 密着膜形成材料、パターン形成方法、及び密着膜の形成方法 |
| WO2023157943A1 (ja) * | 2022-02-18 | 2023-08-24 | 日産化学株式会社 | 不飽和結合及び環式構造を有するシリコン含有レジスト下層膜形成組成物 |
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