WO2015046149A1 - レジスト下層膜形成組成物及びそれを用いたレジストパターンの形成方法 - Google Patents
レジスト下層膜形成組成物及びそれを用いたレジストパターンの形成方法 Download PDFInfo
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- WO2015046149A1 WO2015046149A1 PCT/JP2014/075095 JP2014075095W WO2015046149A1 WO 2015046149 A1 WO2015046149 A1 WO 2015046149A1 JP 2014075095 W JP2014075095 W JP 2014075095W WO 2015046149 A1 WO2015046149 A1 WO 2015046149A1
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Classifications
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
- H01L21/0274—Photolithographic processes
- H01L21/0276—Photolithographic processes using an anti-reflective coating
Definitions
- the present invention is a lithography resist having excellent solid solubility in an organic solvent and excellent coating property to a substrate even when a resist underlayer film having a thin film thickness (for example, 20 nm or less) is formed.
- the present invention relates to an underlayer film forming composition and a resist pattern forming method using the resist underlayer film forming composition.
- the microfabrication forms a thin film of a photoresist composition on a semiconductor substrate such as a silicon wafer, and irradiates with an actinic ray such as ultraviolet rays through a mask pattern on which a device pattern is drawn, and develops it.
- This is a processing method for forming fine irregularities corresponding to the pattern on the substrate surface by etching the substrate using the obtained photoresist pattern as a protective film.
- Patent Documents 1 to 3 there is no intermixing with the photoresist film formed on the upper layer, and when exposure is performed using an ArF excimer laser, desired optical parameters (k value, n value) are obtained, and A resist underlayer film (antireflection film) capable of obtaining a desired dry etching rate is disclosed.
- the characteristics required for the resist lower layer film include, for example, that no intermixing with the resist film formed in the upper layer occurs (insoluble in the resist solvent), and a higher dry etching rate than the resist film. Is mentioned.
- the pattern line width to be formed is 32 nm or less, and the resist underlayer film for EUV exposure is used with a thinner film thickness than in the past.
- the resist underlayer film for EUV exposure is used with a thinner film thickness than in the past.
- An object of this invention is to obtain the composition for forming a resist underlayer film which can form a desired resist pattern by solving the said problem.
- a first aspect of the present invention is a resist underlayer film forming composition for lithography comprising a polymer having a structure represented by the following formula (1) at the end of a polymer chain, a crosslinking agent, a compound for promoting a crosslinking reaction, and an organic solvent. It is.
- R 1, R 2 and R 3 are each independently a hydrogen atom, a linear or branched alkyl group, a halogeno group or a hydroxy group having a carbon number of 1 to 13, wherein R 1, R At least one of 2 and R 3 represents the alkyl group, Ar represents a benzene ring, a naphthalene ring or an anthracene ring, and two carbonyl groups are bonded to two adjacent carbon atoms of the ring represented by Ar, respectively.
- X represents a linear or branched alkyl group having 1 to 6 carbon atoms which may have an alkoxy group having 1 to 3 carbon atoms as a substituent.
- a resist underlayer film forming composition for lithography of the present invention is applied on a semiconductor substrate and baked to form a resist underlayer film having a thickness of 1 nm to 20 nm, on the resist underlayer film Forming a resist film, exposing the semiconductor substrate coated with the resist underlayer film and the resist film with radiation selected from the group consisting of KrF excimer laser, ArF excimer laser, extreme ultraviolet (EUV), and electron beam And a method of forming a resist pattern including a step of developing with an alkaline developer after exposure.
- the resist underlayer film forming composition for lithography of the present invention is characterized in that a polymer terminal contained in the resist underlayer film forming composition is capped with a structure represented by the formula (1). And a composition containing such a polymer, a crosslinking agent, a compound for promoting a crosslinking reaction, and an organic solvent.
- a composition containing such a polymer, a crosslinking agent, a compound for promoting a crosslinking reaction, and an organic solvent By adopting such a configuration, the solubility of the polymer in the organic solvent is improved, so that the coating performance of the resist underlayer film forming composition of the present invention is improved, and a resist having a uniform film thickness of 20 nm or less without defects.
- An underlayer film can be formed.
- FIG. 1 is a diagram showing an upper surface and a cross-section of a substrate on which a pattern is used, which is used in an applicability test.
- the polymer contained in the resist underlayer film forming composition for lithography of the present invention has a structure represented by the formula (1) at the end of the polymer chain.
- at least one of R 1 , R 2 and R 3 represents a linear or branched alkyl group having 1 to 13 carbon atoms.
- alkyl group examples include tert-butyl group, methyl group, ethyl group, propyl group, isopropyl group, butyl group, sec-butyl group, pentyl group, hexyl group, octyl group, nonyl group, decyl group, undecyl group and A dodecyl group can be mentioned, and a tert-butyl group is preferred in the present invention.
- examples of the alkyl group representing X include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a pentyl group, and a hexyl group.
- examples of the alkoxy group include a methoxy group, an ethoxy group, and a propoxy group.
- examples of the halogeno group include a chloro group, a fluoro group, a bromo group and an iodo group. Can do.
- the polymer having the structure represented by the above formula (1) at the end of the polymer chain is a reaction product of a raw material monomer containing a compound represented by the following formula (1a) and a compound represented by the following formula (1b). is there. (In the formula, R 1 , R 2 , R 3 , Ar and X have the same meanings as the formula (1)).
- the said polymer has a structural unit represented, for example by following formula (2) and Formula (3).
- Q 1 and Q 2 are each independently a divalent group having a linear or branched hydrocarbon group having 1 to 13 carbon atoms, or a divalent group having an alicyclic hydrocarbon group.
- the ring may have at least one substituent.
- the raw material monomer for obtaining the polymer forms the structural unit represented by the formula (2) together with the compound represented by the formula (1a) and the compound represented by the formula (1b). And a monomer that forms the structural unit represented by the above formula (3).
- the structural unit represented by the above formula (2) is represented, for example, by the following formula (2 ′).
- Q 3 represents a linear or branched hydrocarbon group having 1 to 13 carbon atoms, a divalent group having an alicyclic hydrocarbon group, or a divalent group having an aromatic ring.
- the hydrocarbon group, the alicyclic hydrocarbon group, and the aromatic ring may have at least one substituent, and two v's each independently represent 0 or 1.
- Q 3 represents a group represented by the following formula, for example.
- the structural unit represented by the above formula (3) is represented by the following formula (3 ′), for example.
- Q 4 represents a linear or branched hydrocarbon group having 1 to 13 carbon atoms, an alicyclic hydrocarbon group or an aromatic ring, and the hydrocarbon group and the alicyclic hydrocarbon group.
- the aromatic ring may have at least one substituent, and the hydrocarbon group may have one or two sulfur atoms in the main chain, may have a double bond, w represents 0 or 1 independently.
- Q 4 represents, for example, a group represented by the following formula.
- Examples of the substituent of the hydrocarbon group include a hydroxy group and a fluoro group.
- Examples of the substituent on the alicyclic hydrocarbon group, the aromatic ring, and the heterocyclic ring include a methyl group, an ethyl group, a tert-butyl group, an allyl group, a hydroxy group, and a fluoro group.
- Examples of the alicyclic hydrocarbon group include a cyclobutylene group, a cyclopentylene group, and a cyclohexylene group.
- Examples of the aromatic ring include benzene, naphthalene, and anthracene.
- Examples of the heterocyclic ring include triazine trione, pyrimidine trione, imidazolidinedione, imidazolidone and pyridone.
- Examples of the compound represented by the formula (1a) include compounds represented by the following formulas (1-1) to (1-17).
- Examples of the compound represented by the formula (1b) include propylene glycol monomethyl ether and 4-methyl-2-pentanol, but are not limited thereto.
- Examples of the monomer that forms the structural unit represented by the formula (2) include compounds having two epoxy groups represented by the following formulas (2-1) to (2-16). it can.
- Examples of the monomer that forms the structural unit represented by the formula (3) include compounds represented by the following formulas (3-1) to (3-10).
- the polymer contained in the resist underlayer film forming composition for lithography of the present invention is represented, for example, by the following formula (4).
- R 1 , R 2 , R 3 , Ar and X have the same meanings as in the above formula (1)
- Y represents a polymer chain having a structural unit represented by the above formula (2) and the above formula (3). Represents.
- the above formula (4) represents that the end of the polymer chain is capped by the structure represented by the formula (1).
- the compound represented by the formula (1a) and the compound represented by the formula (1b) are represented by the formula (2) and the formula
- the total amount of monomers forming the structural unit represented by (3) is 100% by mass, it is, for example, 1% by mass to 30% by mass (in terms of monomer charge ratio), preferably 2% by mass to 20% by mass. is there.
- the polymer contained in the resist underlayer film forming composition for lithography of the present invention may be any of a random copolymer, a block copolymer, an alternating copolymer, and a graft copolymer.
- a polymer polymerization method various methods such as solution polymerization, suspension polymerization, emulsion polymerization, and bulk polymerization are possible, and a polymerization catalyst or the like may be appropriately used.
- the monomer that forms the structural unit represented by the formula (2) and the monomer that forms the structural unit represented by the formula (3) are represented by the formula (1). It can be synthesized by adding a monomer for forming the structure and a polymerization catalyst and performing thermal polymerization.
- the organic solvent used here can be suitably selected from the preferable examples as the organic solvent contained in the resist underlayer film forming composition for lithography of the present invention described later.
- the polymerization catalyst include benzyltriethylammonium chloride and ethyltriphenylphosphonium bromide.
- the polymerization can be performed by heating to 50 to 160 ° C., preferably 70 to 130 ° C.
- the reaction time is, for example, 1 hour to 50 hours, preferably 2 hours to 12 hours.
- the weight average molecular weight of the polymer is, for example, 1000 to 100,000, preferably 1000 to 10,000. When the value of this weight average molecular weight is too high, the applicability of the resist underlayer film forming composition for lithography of the present invention deteriorates.
- the resist underlayer film forming composition for lithography of the present invention is 100% by mass, the polymer contained in the composition is, for example, 0.01% by mass to 3% by mass, preferably 0.1% by mass to 2% by mass. It is.
- the resist underlayer film forming composition for lithography of the present invention further contains a crosslinking agent.
- a crosslinking agent there is no restriction
- crosslinking formation substituents for example, a methylol group, a methoxymethyl group, a butoxymethyl group is used preferably.
- crosslinking agent examples include hexamethoxymethyl melamine, tetramethoxymethyl benzoguanamine, 1,3,4,6-tetrakis (methoxymethyl) glycoluril, 1,3,4,6-tetrakis (butoxymethyl) glycoluril, 1,3,4,6-tetrakis (hydroxymethyl) glycoluril, 1,3-bis (hydroxymethyl) urea, 1,1,3,3-tetrakis (butoxymethyl) urea, 1,1,3,3- Tetrakis (methoxymethyl) urea is mentioned.
- the crosslinking agent contained in the resist underlayer film forming composition for lithography of the present invention is, for example, 1% by mass to 100% by mass, preferably 10% by mass to 50% by mass, when the polymer in the composition is 100% by mass. It is.
- These crosslinking agents may cause a crosslinking reaction by self-condensation, but are structural units represented by the formulas (2) and (3) which are structural units that react with the polymer, particularly the crosslinking agent to form a crosslinking. It is possible to cause a crosslinking reaction with a crosslinking functional group (hydroxy group) therein.
- the resist underlayer film forming composition for lithography of the present invention further contains a compound that promotes the crosslinking reaction.
- a compound that promotes the crosslinking reaction examples include p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonate, salicylic acid, camphorsulfonic acid, 5-sulfosalicylic acid, 4-chlorobenzenesulfonic acid, 4-hydroxybenzenesulfonic acid.
- sulfonic acid compounds such as benzenedisulfonic acid, 1-naphthalenesulfonic acid, citric acid, benzoic acid, and hydroxybenzoic acid, and carboxylic acid compounds can be used. These compounds that accelerate the crosslinking reaction can be used alone or in combination of two or more.
- the compound that promotes the crosslinking reaction contained in the resist underlayer film forming composition for lithography of the present invention is, for example, 0.1% by mass to 25% by mass, preferably 1%, assuming that the polymer in the composition is 100% by mass. Mass% to 10 mass%.
- the resist underlayer film forming composition for lithography of the present invention further contains an organic solvent.
- the organic solvent used in the present invention is not particularly limited as long as it can dissolve the aforementioned polymer.
- the organic solvent contained in the resist underlayer film forming composition for lithography of the present invention is, for example, 90% by mass to 99.99% by mass, preferably 98% by mass to 99.9% by mass, assuming that the composition is 100% by mass. %.
- excluding the organic solvent from the resist underlayer film forming composition is expressed as solid content.
- the resist underlayer film forming composition for lithography of the present invention may further contain an acid generator.
- an acid generator include bis (4-hydroxyphenyl) sulfone.
- the resist underlayer film forming composition for lithography of the present invention contains the acid generator, for example, 0.1% by mass to 5% by mass, preferably 0.2% by mass, when the polymer in the composition is 100% by mass. % To 3% by mass.
- the composition for forming a resist underlayer film for lithography of the present invention may further contain various additives such as a surfactant as necessary as long as the effects of the present invention are not impaired.
- the surfactant is an additive for improving the applicability of the composition to the substrate.
- Known surfactants such as nonionic surfactants and fluorine-based surfactants can be used.
- the surfactant include, for example, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, and polyoxyethylene octylphenyl ether.
- Polyoxyethylene alkylaryl ethers such as polyoxyethylene nonylphenyl ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate Sorbitan fatty acid esters such as sorbitan tristearate, polyoxyethylene sorbitan monolaurate, polyoxy Nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters such as tylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate, Ftop [registered trademark] EF301, EF303, EF352 (Mitsubishi Materials Electronics Chemical Co., Ltd.), MegaFac (registered trademark) F171, F173, R30 (DIC Corporation), Florard FC430, FC431 (Sum salt
- the resist underlayer film forming composition for lithography of the present invention contains the above surfactant, for example, when the polymer in the composition is 100% by mass, it is 0.1% by mass to 5% by mass, preferably 0.8%. 2 to 3% by mass is contained.
- a substrate used in the manufacture of a precision integrated circuit element for example, a semiconductor substrate such as a silicon wafer coated with a silicon oxide film, a silicon nitride film or a silicon oxynitride film, a silicon nitride substrate, a quartz substrate, a glass substrate (no (Including alkali glass, low alkali glass, crystallized glass), glass substrate on which an ITO film is formed) by applying a resist underlayer film forming composition for lithography of the present invention on a glass substrate on which an ITO film is formed by an appropriate coating method such as a spinner or coater, Thereafter, the resist underlayer film is produced by baking and curing using a heating means such as a hot plate.
- a heating means such as a hot plate.
- the conditions for baking after coating are appropriately selected from the range of, for example, a baking temperature of 80 to 250 ° C. and a baking time of 0.3 to 60 minutes, and preferably 150 to 250 ° C. and 0.5 to 5 minutes. It is.
- a crosslinking structure such as a hydroxyl group in the structural unit of the polymer reacts with a crosslinking agent to form a crosslinked structure.
- the crosslinking density of the crosslinked polymer can be increased by crosslinking the polymer contained in the resist underlayer film forming composition for lithography of the present invention.
- the thickness of the resist underlayer film is, for example, 0.001 ⁇ m (1 nm) to 0.1 ⁇ m, preferably 0.001 ⁇ m to 0.02 ⁇ m (20 nm), and more preferably 0.003 ⁇ m to 0.01 ⁇ m. It is.
- the resist film can be formed by a general method, that is, by applying a resist solution onto the resist underlayer film and baking.
- the resist solution to be applied is not particularly limited as long as it is sensitive to, for example, KrF excimer laser, ArF excimer laser, EUV, or electron beam, and either negative type or positive type can be used.
- Usable resist solutions include, for example, Sumitomo Chemical Co., Ltd .; trade names PAR710, PAR855, JSR Corporation; trade names AR2772JN, Shin-Etsu Chemical Co., Ltd .; trade names SEPR430, Dow Chemical Co., Ltd. (Formerly Rohm and Haas Electronic Materials); trade name APEX-X.
- the resist film formed on the upper layer of the resist lower layer film is exposed through a predetermined mask (reticle).
- a predetermined mask for the exposure, for example, a KrF excimer laser, an ArF excimer laser, or EUV can be used. However, in the case of electron beam exposure, a mask (reticle) is not required.
- post-exposure heating PEB: Post Exposure Bake
- the conditions for the post-exposure heating are appropriately selected from the range of a heating temperature of 80 ° C. to 150 ° C. and a heating time of 0.3 minutes to 60 minutes.
- a good resist pattern is obtained by developing, rinsing and drying after exposure.
- an alkaline aqueous solution such as an aqueous solution of an inorganic alkali such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, ethylamine, n-propylamine, etc.
- An aqueous solution of an amine, an aqueous solution of a quaternary ammonium salt such as tetramethylammonium hydroxide, tetraethylammonium hydroxide or choline, or an aqueous solution of a cyclic amine such as pyrrole or piperidine can be used.
- an appropriate amount of an alcohol such as isopropyl alcohol or a nonionic surfactant may be added to the alkaline aqueous solution.
- a preferred developer is an aqueous solution of a quaternary ammonium salt, more preferably an aqueous solution of tetramethylammonium hydroxide.
- the development conditions are appropriately selected from the range of a development temperature of 5 ° C. to 50 ° C. and a development time of 10 seconds to 300 seconds.
- the resist underlayer film exposed by developing and removing the resist film in the above-described step is removed by dry etching, and a desired pattern can be formed on the substrate.
- the weight average molecular weights shown in the following Synthesis Examples 1 to 7 in the present specification are measurement results by gel permeation chromatography (hereinafter abbreviated as GPC in the present specification).
- GPC gel permeation chromatography
- a GPC device manufactured by Tosoh Corporation was used, and the measurement conditions were as follows. Further, the dispersity shown in the following synthesis examples of the present specification is calculated from the measured weight average molecular weight and number average molecular weight.
- the reaction vessel was purged with nitrogen and reacted at 135 ° C. for 4 hours to obtain a polymer solution.
- the polymer solution does not cause white turbidity or the like even when cooled to room temperature, and has good solubility in propylene glycol monomethyl ether.
- the polymer in the obtained solution had a weight average molecular weight of 5029 and a dispersity of 3.04 in terms of standard polystyrene.
- the polymer obtained in this synthesis example has structural units represented by the following formulas (5) and (6), and has a structure represented by the following formula (7) at the end.
- the reaction vessel was purged with nitrogen and reacted at 135 ° C. for 4 hours to obtain a polymer solution.
- the polymer solution does not cause white turbidity or the like even when cooled to room temperature, and has good solubility in propylene glycol monomethyl ether.
- the polymer in the obtained solution had a weight average molecular weight of 1639 in terms of standard polystyrene and a dispersity of 2.67.
- the polymer obtained in this synthesis example has the structural units represented by the above formulas (5) and (6) as well as the polymer obtained in synthesis example 1, and is represented by the above formula (7). It has a structure at the end.
- the reaction vessel was purged with nitrogen and reacted at 135 ° C. for 4 hours to obtain a polymer solution.
- the polymer solution does not cause white turbidity or the like even when cooled to room temperature, and has good solubility in propylene glycol monomethyl ether.
- the polymer in the obtained solution had a weight average molecular weight of 4366 in terms of standard polystyrene and a dispersity of 2.29.
- the polymer obtained in this synthesis example has the structural units represented by the above formulas (5) and (6) as well as the polymer obtained in synthesis example 1, and is represented by the above formula (7). It has a structure at the end.
- the reaction vessel was purged with nitrogen and reacted at 135 ° C. for 4 hours to obtain a polymer solution.
- the polymer solution does not cause white turbidity or the like even when cooled to room temperature, and has good solubility in propylene glycol monomethyl ether.
- the polymer in the obtained solution had a weight average molecular weight of 1671 and a dispersity of 1.78 in terms of standard polystyrene.
- the polymer obtained in this synthesis example has structural units represented by the following formulas (5) and (8), and has a structure represented by the following formula (7) at the terminal.
- the polymer solution does not cause white turbidity or the like even when cooled to room temperature, and has good solubility in propylene glycol monomethyl ether.
- the polymer in the obtained solution had a weight average molecular weight of 4319 in terms of standard polystyrene and a dispersity of 1.92.
- the polymer obtained in this synthesis example has structural units represented by the following formulas (9) and (6), and has a structure represented by the following formula (7) at the terminal.
- the reaction vessel was purged with nitrogen and reacted at 135 ° C. for 4 hours to obtain a polymer solution.
- the polymer solution does not cause white turbidity or the like even when cooled to room temperature, and has good solubility in propylene glycol monomethyl ether.
- the polymer in the obtained solution had a weight average molecular weight of 1726 and a dispersity of 1.69 in terms of standard polystyrene.
- the polymer obtained in this synthesis example has structural units represented by the following formulas (9) and (8), and has a structure represented by the following formula (7) at the terminal.
- the polymer solution does not cause white turbidity or the like even when cooled to room temperature, and has good solubility in propylene glycol monomethyl ether.
- the polymer in the obtained solution had a weight average molecular weight of 15673 in terms of standard polystyrene and a dispersity of 3.39.
- the polymer obtained in this synthesis example has structural units represented by the following formulas (5) and (6), but the polymer does not have the structure represented by the above formula (7) at the terminal.
- solubility in propylene glycol monomethyl ether acetate was evaluated by absorbance using an ultraviolet-visible spectrophotometer UV-2550 (manufactured by Shimadzu Corporation). The lower the measured absorbance, the higher the solubility of the polymer.
- a mixed solvent of propylene glycol monomethyl ether acetate / propylene glycol monomethyl ether 97/3 (mass%) was used.
- Example 1 To 1.75 g of the polymer solution containing 0.31 g of the polymer obtained in Synthesis Example 3, tetramethoxymethyl glycoluril (manufactured by Nippon Cytec Industries [former Mitsui Cytec], trade name: POWDERLINK [registered trademark] 1174 ) 0.078 g and 5-sulfosalicylic acid (Tokyo Kasei Kogyo Co., Ltd.) 0.0078 g were mixed, and propylene glycol monomethyl ether 10.36 g and propylene glycol monomethyl ether acetate 27.72 g were added and dissolved. Thereafter, the mixture was filtered using a polyethylene microfilter having a pore diameter of 0.05 ⁇ m to obtain a resist underlayer film forming composition for lithography.
- tetramethoxymethyl glycoluril manufactured by Nippon Cytec Industries [former Mitsui Cytec], trade name: POWDERLINK [registered trademark] 1174
- Example 3 To 1.35 g of the polymer solution containing 0.24 g of polymer obtained in Synthesis Example 5 above, tetramethoxymethyl glycoluril (manufactured by Nippon Cytec Industries [former Mitsui Cytec], trade name: POWDERLINK [registered trademark] 1174 0.059 g and 0.0059 g of pyridinium p-toluenesulfonate (Tokyo Chemical Industry Co., Ltd.) were mixed, and 7.74 g of propylene glycol monomethyl ether and 20.79 g of propylene glycol monomethyl ether acetate were added and dissolved. Thereafter, the mixture was filtered using a polyethylene microfilter having a pore diameter of 0.05 ⁇ m to obtain a resist underlayer film forming composition for lithography.
- tetramethoxymethyl glycoluril manufactured by Nippon Cytec Industries [former Mitsui Cytec], trade name: POWDERLINK [registered trademark] 1174
- Each of the resist underlayer film forming compositions prepared in Examples 1 to 4 and Comparative Example 1 has a structure having a top surface and a cross section shown in FIG. 1 and a square pattern having a length of 13 ⁇ m, a width of 13 ⁇ m, a height of 230 nm, and a length
- the film was applied to a silicon wafer substrate having a cross pattern of 14 ⁇ m, 14 ⁇ m in width, and 230 nm in height with a film thickness of 5 nm, and the coating property was confirmed with a dark field of an optical microscope (manufactured by Olympus Corporation, MX61L). Good coatability could be confirmed only when the resist underlayer film forming compositions of Examples 1 to 4 were applied.
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Abstract
Description
(式中、R1、R2及びR3はそれぞれ独立に水素原子、炭素原子数1乃至13の直鎖状若しくは分岐鎖状のアルキル基、ハロゲノ基又はヒドロキシ基を表し、前記R1、R2及びR3の少なくとも1つは前記アルキル基を表し、Arはベンゼン環、ナフタレン環又はアントラセン環を表し、2つのカルボニル基はそれぞれ前記Arで表される環の隣接する2つの炭素原子と結合するものであり、Xは炭素原子数1乃至3のアルコキシ基を置換基として有してもよい炭素原子数1乃至6の直鎖状又は分岐鎖状のアルキル基を表す。)
本発明のリソグラフィー用レジスト下層膜形成組成物に含まれるポリマーは、前記式(1)で表される構造をポリマー鎖の末端に有する。該式(1)中、R1、R2及びR3の少なくとも1つは、炭素原子数1乃至13の直鎖状若しくは分岐鎖状のアルキル基を表す。該アルキル基として、例えば、tert-ブチル基、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、sec-ブチル基、ペンチル基、ヘキシル基、オクチル基、ノニル基、デシル基、ウンデシル基及びドデシル基を挙げることができ、本発明ではtert-ブチル基が好ましい。前記式(1)中、Xを表すアルキル基として、例えば、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、sec-ブチル基、ペンチル基及びヘキシル基を挙げることができ、置換基であるアルコキシ基として、例えば、メトキシ基、エトキシ基及びプロポキシ基を挙げることができる。さらに、前記式(1)のR1、R2及びR3のうち1つ又は2つがハロゲノ基を表す場合、該ハロゲノ基として、例えば、クロロ基、フルオロ基、ブロモ基及びヨード基を挙げることができる。
(式中、R1、R2、R3、Ar及びXは前記式(1)と同義である。)
(式中、Q1及びQ2はそれぞれ独立に、炭素原子数1乃至13の直鎖状若しくは分岐鎖状の炭化水素基を有する二価の基、脂環式炭化水素基を有する二価の基、芳香環を有する二価の基、又は窒素原子を1乃至3つ含む複素環を有する二価の基を表し、前記炭化水素基、前記脂環式炭化水素基、前記芳香環及び前記複素環は置換基を少なくとも1つ有してもよい。)
この場合、上記ポリマーを得るための原料モノマーには、上記式(1a)で表される化合物及び上記式(1b)で表される化合物と共に、上記式(2)で表される構造単位を形成するモノマーと、上記式(3)で表される構造単位を形成するモノマーが含まれる。
(式中、Q3は炭素原子数1乃至13の直鎖状若しくは分岐鎖状の炭化水素基、脂環式炭化水素基を有する二価の基、又は芳香環を有する二価の基を表し、前記炭化水素基、前記脂環式炭化水素基及び前記芳香環は置換基を少なくとも1つ有してもよく、2つのvはそれぞれ独立に0又は1を表す。)
(式中、Q4は炭素原子数1乃至13の直鎖状若しくは分岐鎖状の炭化水素基、脂環式炭化水素基又は芳香環を表し、前記炭化水素基、前記脂環式炭化水素基及び前記芳香環は置換基を少なくとも1つ有してもよく、前記炭化水素基は主鎖に1つ又は2つの硫黄原子を有しても、二重結合を有してもよく、2つのwはそれぞれ独立に0又は1を表す。)
(式中、R1、R2、R3、Ar及びXは前記式(1)と同義であり、Yは前記式(2)及び前記式(3)で表される構造単位を有するポリマー鎖を表す。)
上記式(4)は、前記式(1)で表される構造によって、上記ポリマー鎖の末端がキャッピングされていることを表している。
本発明のリソグラフィー用レジスト下層膜形成組成物は、さらに架橋剤を含む。その架橋剤として、特に制限はないが、少なくとも二つの架橋形成置換基(例えば、メチロール基、メトキシメチル基、ブトキシメチル基)を有する含窒素化合物が好ましく用いられる。
架橋反応を促進させるために、本発明のリソグラフィー用レジスト下層膜形成組成物は、さらに架橋反応を促進させる化合物を含む。そのような化合物としては、例えば、p-トルエンスルホン酸、トリフルオロメタンスルホン酸、ピリジニウムp-トルエンスルホナート、サリチル酸、カンファースルホン酸、5-スルホサリチル酸、4-クロロベンゼンスルホン酸、4-ヒドロキシベンゼンスルホン酸、ベンゼンジスルホン酸、1-ナフタレンスルホン酸、クエン酸、安息香酸、ヒドロキシ安息香酸等のスルホン酸化合物及びカルボン酸化合物を使用できる。これら架橋反応を促進させる化合物は、一種のみを使用することができ、また、二種以上を組み合わせて用いることもできる。本発明のリソグラフィー用レジスト下層膜形成組成物に含まれる上記架橋反応を促進させる化合物は、当該組成物中のポリマーを100質量%とすると、例えば0.1質量%乃至25質量%、好ましくは1質量%乃至10質量%である。
本発明のリソグラフィー用レジスト下層膜形成組成物はさらに有機溶媒を含む。本発明において使用される有機溶媒としては、前述のポリマーを溶解することができれば特に制限されず、例えば、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、メチルセロソルブアセテート、エチルセロソルブアセテート、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、プロピレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノプロピルエーテル、1-エトキシ-2-プロパノール、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールプロピルエーテルアセテート、1-メトキシ-2-ブタノール、2-メトキシ-1-ブタノール、3-メトキシ-3-メチルブタノール、3-メトキシ-1-ブタノール、トルエン、キシレン、メチルエチルケトン、シクロペンタノン、シクロヘキサノン、γ-ブチロラクトン、N-メチル-2-ピロリドン、2-ヒドロキシイソ酪酸メチル、2-ヒドロキシプロピオン酸エチル、2-ヒドロキシ-2-メチルプロピオン酸エチル、エトキシ酢酸エチル、ヒドロキシ酢酸エチル、2-ヒドロキシ-3-メチルブタン酸メチル、3-メトキシプロピオン酸メチル、3-メトキシプロピオン酸エチル、3-エトキシプロピオン酸エチル、3-エトキシプロピオン酸メチル、ピルビン酸メチル、ピルビン酸エチル、酢酸エチル、酢酸ブチル、乳酸エチル、乳酸ブチルを用いることができる。これらの有機溶剤は単独で、又は2種以上の組合せで使用される。
本発明のリソグラフィー用レジスト下層膜形成組成物はさらに酸発生剤を含んでいてもよい。そのような酸発生剤としては、例えば、ビス(4-ヒドロキシフェニル)スルホンが挙げられる。本発明のリソグラフィー用レジスト下層膜形成組成物が上記酸発生剤を含む場合、当該組成物中のポリマーを100質量%とすると、例えば0.1質量%乃至5質量%、好ましくは0.2質量%乃至3質量%含む。
本発明のリソグラフィー用レジスト下層膜形成組成物には、必要に応じて界面活性剤等の各種添加剤を、本発明の効果を損なわない限りにおいてさらに含んでもよい。界面活性剤は、基板に対する当該組成物の塗布性を向上させるための添加物である。ノニオン系界面活性剤、フッ素系界面活性剤のような公知の界面活性剤を用いることができる。
GPCカラム:Shodex〔登録商標〕・Asahipak〔登録商標〕(昭和電工(株))
カラム温度:40℃
溶媒:N,N-ジメチルホルムアミド(DMF)
流量:0.6ml/分
標準試料:ポリスチレン(東ソー(株)製)
ディテクター:RIディテクター(東ソー(株)製、RI-8020)
テレフタル酸ジグリシジルエステル(ナガセケムテックス(株)製、商品名:デナコール〔登録商標〕EX711)5.00g、5-ヒドロキシイソフタル酸(東京化成工業(株)製)3.17g、4-tert-ブチルフタル酸無水物(東京化成工業(株)製)0.53g及びベンジルトリエチルアンモニウムクロリド(東京化成工業(株)製)0.20gを、プロピレングリコールモノメチルエーテル35.58gに加え溶解させた。反応容器を窒素置換後、135℃で4時間反応させ、ポリマー溶液を得た。当該ポリマー溶液は、室温に冷却しても白濁等を生じることはなく、プロピレングリコールモノメチルエーテルに対する溶解性は良好である。GPC分析を行ったところ、得られた溶液中のポリマーは標準ポリスチレン換算にて重量平均分子量5029、分散度は3.04であった。本合成例で得られたポリマーは、下記式(5)及び式(6)で表される構造単位を有すると共に、下記式(7)で表される構造を末端に有する。
テレフタル酸ジグリシジルエステル(ナガセケムテックス(株)製、商品名:デナコール〔登録商標〕EX711)5.00g、5-ヒドロキシイソフタル酸(東京化成工業(株)製)3.17g、4-tert-ブチルフタル酸無水物(東京化成工業(株)製)0.71g及びベンジルトリエチルアンモニウムクロリド(東京化成工業(株)製)0.20gを、プロピレングリコールモノメチルエーテル36.30gに加え溶解させた。反応容器を窒素置換後、135℃で4時間反応させ、ポリマー溶液を得た。当該ポリマー溶液は、室温に冷却しても白濁等を生じることはなく、プロピレングリコールモノメチルエーテルに対する溶解性は良好である。GPC分析を行ったところ、得られた溶液中のポリマーは、標準ポリスチレン換算にて重量平均分子量1639、分散度は2.67であった。本合成例で得られたポリマーは、合成例1で得られたポリマーと同様、上記式(5)及び式(6)で表される構造単位を有すると共に、上記式(7)で表される構造を末端に有する。
テレフタル酸ジグリシジルエステル(ナガセケムテックス(株)製、商品名:デナコール〔登録商標〕EX711)5.00g、5-ヒドロキシイソフタル酸(東京化成工業(株)製)3.17g、4-tert-ブチルフタル酸無水物(東京化成工業(株)製)0.80g及びベンジルトリエチルアンモニウムクロリド(東京化成工業(株)製)0.20gを、プロピレングリコールモノメチルエーテル36.65gに加え溶解させた。反応容器を窒素置換後、135℃で4時間反応させ、ポリマー溶液を得た。当該ポリマー溶液は、室温に冷却しても白濁等を生じることはなく、プロピレングリコールモノメチルエーテルに対する溶解性は良好である。GPC分析を行ったところ、得られた溶液中のポリマーは、標準ポリスチレン換算にて重量平均分子量4366、分散度は2.29であった。本合成例で得られたポリマーは、合成例1で得られたポリマーと同様、上記式(5)及び式(6)で表される構造単位を有すると共に、上記式(7)で表される構造を末端に有する。
テレフタル酸ジグリシジルエステル(ナガセケムテックス(株)製、商品名:デナコール〔登録商標〕EX711)5.00g、2,4-ジヒドロキシ安息香酸(東京化成工業(株)製)2.68g、4-tert-ブチルフタル酸無水物(東京化成工業(株)製)0.80g及びベンジルトリエチルアンモニウムクロリド(東京化成工業(株)製)0.20gを、プロピレングリコールモノメチルエーテル34.70gに加え溶解させた。反応容器を窒素置換後、135℃で4時間反応させ、ポリマー溶液を得た。当該ポリマー溶液は、室温に冷却しても白濁等を生じることはなく、プロピレングリコールモノメチルエーテルに対する溶解性は良好である。GPC分析を行ったところ、得られた溶液中のポリマーは、標準ポリスチレン換算にて重量平均分子量1671、分散度は1.78であった。本合成例で得られたポリマーは、下記式(5)及び式(8)で表される構造単位を有すると共に、下記式(7)で表される構造を末端に有する。
モノアリルジグリシジルイソシアヌル酸(四国化成工業(株)製)5.00g、5-ヒドロキシイソフタル酸(東京化成工業(株)製)3.27g、4-tert-ブチルフタル酸無水物(東京化成工業(株)製)0.82g及びベンジルトリエチルアンモニウムクロリド(東京化成工業(株)製)0.20gを、プロピレングリコールモノメチルエーテル37.18gに加え溶解させた。反応容器を窒素置換後、135℃で4時間反応させ、ポリマー溶液を得た。当該ポリマー溶液は、室温に冷却しても白濁等を生じることはなく、プロピレングリコールモノメチルエーテルに対する溶解性は良好である。GPC分析を行ったところ、得られた溶液中のポリマーは、標準ポリスチレン換算にて重量平均分子量4319、分散度は1.92であった。本合成例で得られたポリマーは、下記式(9)及び式(6)で表される構造単位を有すると共に、下記式(7)で表される構造を末端に有する。
モノアリルジグリシジルイソシアヌル酸(四国化成工業(株)製)5.00g、2,4-ジヒドロキシ安息香酸(東京化成工業(株)製)2.76g、4-tert-ブチルフタル酸無水物(東京化成工業(株)製)0.82g及びベンジルトリエチルアンモニウムクロリド(東京化成工業(株)製)0.20gを、プロピレングリコールモノメチルエーテル35.17gに加え溶解させた。反応容器を窒素置換後、135℃で4時間反応させ、ポリマー溶液を得た。当該ポリマー溶液は、室温に冷却しても白濁等を生じることはなく、プロピレングリコールモノメチルエーテルに対する溶解性は良好である。GPC分析を行ったところ、得られた溶液中のポリマーは、標準ポリスチレン換算にて重量平均分子量1726、分散度は1.69であった。本合成例で得られたポリマーは、下記式(9)及び式(8)で表される構造単位を有すると共に、下記式(7)で表される構造を末端に有する。
テレフタル酸ジグリシジルエステル(ナガセケムテックス(株)製、商品名:デナコール〔登録商標〕EX711)5.00g、5-ヒドロキシイソフタル酸(東京化成工業(株)製)3.15g及びベンジルトリエチルアンモニウムクロリド(東京化成工業(株)製)0.20gを、プロピレングリコールモノメチルエーテル35.60gに加え溶解させた。反応容器を窒素置換後、135℃で4時間反応させ、ポリマー溶液を得た。当該ポリマー溶液は、室温に冷却しても白濁等を生じることはなく、プロピレングリコールモノメチルエーテルに対する溶解性は良好である。GPC分析を行ったところ、得られた溶液中のポリマーは、標準ポリスチレン換算にて重量平均分子量15673、分散度は3.39であった。本合成例で得られたポリマーは、下記式(5)及び式(6)で表される構造単位を有するが、そのポリマーは上記式(7)で表される構造を末端に有さない。
得られたポリマーを用いてリソグラフィー用レジスト下層膜形成組成物を調製する際、使用する有機溶媒へのポリマーの溶解性の向上は、当該組成物の塗布性を向上させる。そのため、PGMEAと略称されるプロピレングリコールモノメチルエーテルアセテートへの溶解性を、紫外線可視分光光度計UV-2550((株)島津製作所製)を用いて、吸光度にて評価した。測定される吸光度が低いほど、ポリマーの溶解性が高いことを示す。リファレンス用として、プロピレングリコールモノメチルエーテルアセテート/プロピレングリコールモノメチルエーテル=97/3(質量%)の混合溶媒を用いた。
上記合成例3で得られた、ポリマー0.31gを含むポリマー溶液1.75gに、テトラメトキシメチルグリコールウリル(日本サイテックインダストリーズ〔旧三井サイテック〕(株)製、商品名:POWDERLINK〔登録商標〕1174)0.078g及び5-スルホサリチル酸(東京化成工業(株)製)0.0078gを混合し、プロピレングリコールモノメチルエーテル10.36g及びプロピレングリコールモノメチルエーテルアセテート27.72gを加え溶解させた。その後孔径0.05μmのポリエチレン製ミクロフィルターを用いてろ過して、リソグラフィー用レジスト下層膜形成組成物とした。
上記合成例4で得られた、ポリマー0.24gを含むポリマー溶液1.40gに、テトラメトキシメチルグリコールウリル(日本サイテックインダストリーズ〔旧三井サイテック〕(株)製、商品名:POWDERLINK〔登録商標〕1174)0.059g及びピリジニウムp-トルエンスルホナート0.0059g(東京化成工業(株)製)を混合し、プロピレングリコールモノメチルエーテル7.75g及びプロピレングリコールモノメチルエーテルアセテート20.79gを加え溶解させた。その後孔径0.05μmのポリエチレン製ミクロフィルターを用いてろ過して、リソグラフィー用レジスト下層膜形成組成物とした。
上記合成例5で得られた、ポリマー0.24gを含むポリマー溶液1.35gに、テトラメトキシメチルグリコールウリル(日本サイテックインダストリーズ〔旧三井サイテック〕(株)製、商品名:POWDERLINK〔登録商標〕1174)0.059g及びピリジニウムp-トルエンスルホナート(東京化成工業(株))製0.0059gを混合し、プロピレングリコールモノメチルエーテル7.74g及びプロピレングリコールモノメチルエーテルアセテート20.79gを加え溶解させた。その後孔径0.05μmのポリエチレン製ミクロフィルターを用いてろ過して、リソグラフィー用レジスト下層膜形成組成物とした。
上記合成例6で得られた、ポリマー0.24gを含むポリマー溶液1.29gに、テトラメトキシメチルグリコールウリル(日本サイテックインダストリーズ〔旧三井サイテック〕(株)製、商品名:POWDERLINK〔登録商標〕1174)0.059g及びピリジニウムp-トルエンスルホナート(東京化成工業(株))製0.0059gを混合し、プロピレングリコールモノメチルエーテル7.80g及びプロピレングリコールモノメチルエーテルアセテート20.79gを加え溶解させた。その後孔径0.05μmのポリエチレン製ミクロフィルターを用いてろ過して、リソグラフィー用レジスト下層膜形成組成物とした。
上記合成例7で得られた、ポリマー0.23gを含むポリマー溶液1.31gに、テトラメトキシメチルグリコールウリル(日本サイテックインダストリーズ〔旧三井サイテック〕(株)製、商品名:POWDERLINK〔登録商標〕1174)0.059g及び5-スルホサリチル酸0.0058gを混合し、プロピレングリコールモノメチルエーテル21.27g及びプロピレングリコールモノメチルエーテルアセテート8.91gを加え溶解させた。その後孔径0.05μmのポリエチレン製ミクロフィルターを用いてろ過して、リソグラフィー用レジスト下層膜形成組成物とした。
下記式(10)で表される共重合体をポリマーとして含み、さらに添加物として下記式(11)で表される架橋剤、及びピリジニウムp-トルエンスルホナートを含むレジスト下層膜形成組成物を用意した。
実施例1乃至4、比較例1及び比較例2のレジスト下層膜形成組成物を、それぞれ、スピナーにより、半導体基板であるシリコンウェハー上に塗布した。そのシリコンウェハーをホットプレート上に配置し、205℃で1分間ベークし、レジスト下層膜(膜厚0.05μm)を形成した。これらのレジスト下層膜をフォトレジストに使用する溶剤である乳酸エチル及びプロピレングリコールモノメチルエーテルに浸漬し、それらの溶剤に不溶であることを確認した。
実施例1乃至4、比較例1及び比較例2のレジスト下層膜形成組成物を、それぞれ、スピナーを用い、シリコンウェハー上に塗布した。そのシリコンウェハーをホットプレート上に配置し、205℃で1分間ベークし、レジスト下層膜(膜厚0.10μm)を形成した。そして、日本サイエンティフィック社製、RIEシステムES401を用いてドライエッチング速度を測定した。
実施例1乃至4、比較例1で調製されたレジスト下層膜形成組成物を、それぞれ、図1に上面及び断面を示す構造の、縦13μm、横13μm、高さ230nmの正方形のパターン、及び縦14μm、横14μm、高さ230nmの十字形のパターンが形成されたシリコンウェハー基板に5nmの膜厚で塗布し、光学顕微鏡(オリンパス(株)製、MX61L)のダークフィールドで塗布性を確認した。実施例1乃至4のレジスト下層膜形成組成物を塗布した場合のみ、良好な塗布性を確認できた。
Claims (10)
- 下記式(1)で表される構造をポリマー鎖の末端に有するポリマー、架橋剤、架橋反応を促進させる化合物及び有機溶媒を含むリソグラフィー用レジスト下層膜形成組成物。
(式中、R1、R2及びR3はそれぞれ独立に水素原子、炭素原子数1乃至13の直鎖状若しくは分岐鎖状のアルキル基、ハロゲノ基又はヒドロキシ基を表し、前記R1、R2及びR3の少なくとも1つは前記アルキル基を表し、Arはベンゼン環、ナフタレン環又はアントラセン環を表し、2つのカルボニル基はそれぞれ前記Arで表される環の隣接する2つの炭素原子と結合するものであり、Xは炭素原子数1乃至3のアルコキシ基を置換基として有してもよい炭素原子数1乃至6の直鎖状又は分岐鎖状のアルキル基を表す。) - 前記ポリマーの重量平均分子量は1000乃至100000である請求項1乃至請求項6のいずれか一項に記載のリソグラフィー用レジスト下層膜形成組成物。
- 前記有機溶媒は、プロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、1-エトキシ-2-プロパノール、乳酸エチル、乳酸ブチル、及びシクロヘキサノンからなる群から選択される1種、又は2種以上の組み合わせである請求項1乃至請求項7のいずれか一項に記載のリソグラフィー用レジスト下層膜形成組成物。
- 更に酸発生剤を含むものである請求項1乃至請求項8のいずれか一項に記載のリソグラフィー用レジスト下層膜形成組成物。
- 請求項1乃至請求項9のいずれか一項に記載のリソグラフィー用レジスト下層膜形成組成物を半導体基板上に塗布しベークして厚さ1nm乃至20nmのレジスト下層膜を形成する工程、前記レジスト下層膜上にレジスト膜を形成する工程、前記レジスト下層膜と前記レジスト膜で被覆された半導体基板をKrFエキシマレーザー、ArFエキシマレーザー、極端紫外線及び電子線からなる群から選択される放射線により露光する工程、及び露光後にアルカリ性現像液によって現像する工程を含む、レジストパターンの形成方法。
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