WO2006040956A1 - 金属酸化物を含むリソグラフィー用下層膜形成組成物 - Google Patents
金属酸化物を含むリソグラフィー用下層膜形成組成物 Download PDFInfo
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- WO2006040956A1 WO2006040956A1 PCT/JP2005/018294 JP2005018294W WO2006040956A1 WO 2006040956 A1 WO2006040956 A1 WO 2006040956A1 JP 2005018294 W JP2005018294 W JP 2005018294W WO 2006040956 A1 WO2006040956 A1 WO 2006040956A1
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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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- the present invention relates to a composition for forming an underlayer film for lithography used in a lithography process for manufacturing a semiconductor device. Specifically, the present invention relates to an underlayer film forming composition for lithography for forming an underlayer film that can be used as a hard mask. The present invention also relates to an underlayer film formed from the underlayer film forming composition for lithography. The present invention also relates to a method for forming a photoresist pattern using the composition for forming a lower layer film for lithography.
- an underlayer film or an organic underlayer film made of an organic material such as an antireflection film or a flat film is formed between the semiconductor substrate and the photoresist.
- the photoresist pattern as a protective film
- the organic underlayer film is removed by etching, and then the semiconductor substrate is processed.
- Etching of the organic underlayer film is generally performed by dry etching.
- the organic underlayer tends to be used with a high removal rate by dry etching.
- the photoresist is made of an organic material like the organic underlayer film, it is difficult to suppress the decrease in the thickness of the photoresist.
- an underlayer film between a semiconductor substrate and a photoresist a film made of an inorganic substance known as a hard mask is used.
- the photoresist (organic material) and the hard mask (underlayer film: inorganic material) have a large difference in their constituent components, so the speed removed by dry etching is used for dry etching. It depends greatly on the gas type. Then, by appropriately selecting the gas type, it becomes possible to remove the lower layer film (hard mask) that is not accompanied by a large decrease in the film thickness of the photoresist by dry etching.
- a lower layer film as a hard mask has been formed by a vapor deposition method using a CVD apparatus, a vacuum vapor deposition apparatus, a sputtering apparatus, or the like.
- a photoresist and an organic underlayer film are formed by application on a semiconductor substrate by a spin coater and subsequent baking (hereinafter referred to as a spin coat method).
- the spin coat method is simpler than the vapor deposition method. Therefore, it is required to form an underlayer film that can be used as a hard mask by a spin coating method.
- Patent Document 1 Japanese Patent Laid-Open No. 11 2558813
- Patent Document 2 Japanese Patent Laid-Open No. 2000-10293
- Patent Document 3 Japanese Unexamined Patent Publication No. 2003-177206
- Patent Document 4 Japanese Patent Laid-Open No. 2001-53068
- Patent Document 5 Japanese Patent Laid-Open No. 2001-343752
- Patent Document 6 Japanese Patent Laid-Open No. 2001-92122
- Patent Document 7 Japanese Unexamined Patent Publication No. 2000-292931
- An object of the present invention is to provide an underlayer film forming composition for lithography for forming an underlayer film that can be used as a hard mask by a spin coating method.
- Another object of the present invention is to provide a lower layer film that can be formed by spin coating and that does not cause intermixing with the photoresist that is applied and formed on the upper layer, and a composition for forming a lower layer film for lithography for forming the lower layer film. is there.
- M represents a group force selected from the group forces of zirconium, yttrium, cerium, and hafnium
- R represents a carbon atom having 1 to: an alkyl group of LO, 2 to carbon atoms:
- N represents a number corresponding to the valence of the metal atom
- the hydrolysis reaction is carried out in an organic solvent using 5 to 40 parts by mass of water and 0.1 to 20 parts by mass of catalyst with respect to 100 parts by mass of the oxymetal compound.
- the underlayer film forming composition for lithography according to the first aspect characterized in that the composition is carried out at -50 ° C and a reaction time of 0.1-10 hours,
- the hydrolysis reaction is performed in the presence of a nitrogen-containing compound having a nitrogen atom substituted with 1 to 60 parts by mass of a hydroxymethyl group or an alkoxymethyl group with respect to 100 parts by mass of the oxymetal compound.
- the underlayer film forming composition for lithography according to the first aspect wherein the oxymetal compound is zirconium tetrabutoxide,
- composition for forming a lower layer film for lithography according to the first aspect further comprising an organic polymer compound
- the firing is performed at a temperature of 150 ° C. to 250 ° C. for a time of 1 minute to 10 minutes,
- a step of applying the lower film forming composition for lithography according to any one of the first to fifth aspects on a semiconductor substrate and baking to form a lower film, on the lower film Forming a photoresist layer used in the manufacture of a semiconductor device, comprising: forming a photoresist layer on the substrate; exposing the semiconductor substrate covered with the lower layer film and the photoresist layer; and developing after the exposure.
- the present invention is an underlayer film forming composition for forming an underlayer film containing a large amount of an inorganic substance.
- the film can be formed by spin coating.
- a photoresist pattern having a good shape can be formed.
- an underlayer film that can be used as a hard mask can be formed by a spin coating method from the underlayer film forming composition for lithography of the present invention.
- the removal rate by dry etching can be made larger than that of the photoresist by selecting the gas type. Therefore, according to the present invention, it is possible to perform a lithography process using a thin film photoresist.
- the composition for forming a lower layer film for lithography of the present invention includes a metal oxide obtained by a hydrolysis reaction of an oxymetal compound, and a solvent.
- the underlayer film forming composition of this invention can contain an organic polymer compound, a photo-acid generator, surfactant, etc.
- the ratio of the solid content in the underlayer film forming composition of the present invention is not particularly limited as long as each component is uniformly dissolved, but is, for example, 1 to 50% by mass, preferably 3 to 30% by mass. %, More preferably 5 to 15% by mass.
- the solid content is obtained by removing the solvent component from all the components of the lower layer film-forming composition for lithography.
- composition for forming a lower layer film for lithography of the present invention will be specifically described below.
- the underlayer film forming composition for lithography of the present invention contains a metal oxide obtained by hydrolysis reaction of an oxymetal compound represented by the formula (1).
- the metal atom is a metal atom in which a group force such as zirconium, yttrium, cerium, and humumka is selected.
- R is an alkyl group having 1 to 10 carbon atoms, an alkyl group having 2 to 10 carbon atoms.
- N represents a number corresponding to the valence of the metal atom (M).
- M metal atom
- alkyl group examples include a methyl group, an ethyl group, a normal hexyl group, a normal decyl group, an isopropyl group, a 2-ethylhexyl group, a cyclopentyl group, a cyclohexyl group, an adamantyl group, a normal butyl group, and an isopropyl group.
- alkenyl group examples include a bur group, a 2-propenyl group, and a 2-butenyl group.
- aryl group examples include a phenyl group, a 1 naphthyl group, a 2 naphthyl group, a 9-anthryl group, and a 2-bromo 1-naphthyl group.
- aralkyl group examples include a benzyl group, a phenyl group, an anthrylmethyl group, and a 3-phenylpropyl group.
- aryloxyalkyl group examples include a phenoxymethyl group, a phenoxycetyl group, a phenoxypropyl group, a naphthyloxycetyl group, and the like.
- alkoxyalkyl group examples include a methoxymethyl group, a methoxyethyl group, a methoxypropyl group, and an ethoxyethyl group.
- the metal atom is zirconium, for example, zirconium tetramethoxide, zirconium tetraethoxide, zirconium tetranormal propoxide, zirconium tetraisopropoxide, zirconium tetrabutoxide, zirconium tetraphenol. Sid, zirconium tetraphenyl ethoxide and the like.
- oxymetal compound in the case of metallic nuclear power S yttrium, for example, yttrium trimethoxide, yttrium triethoxide, yttrium triisopropoxide, yttrium tributoxide, yttrium triphenoxide, yttrium trifethoxide, yttrium.
- metallic nuclear power S yttrium for example, yttrium trimethoxide, yttrium triethoxide, yttrium triisopropoxide, yttrium tributoxide, yttrium triphenoxide, yttrium trifethoxide, yttrium.
- examples include trienoxychetoxide and yttrium trimethoxyethoxide.
- the metal atom is cerium, for example, cerium tetramethoxide, cerium tetraethoxide, cerium tetraisopropoxide, cerium tetrabutoxide, cerium tetraphenoxide, cerium tetraferoxide , Cerium tetrapheno cetoxide, cerium tetramethoxy ethoxide and the like.
- hafnium for example, hafnium tetramethoxide, hafnium tetraethoxide, hafnium tetraisopropoxide, hafnium Examples thereof include tetrabutoxide, hafnium tetraphenoxide, hafnium tetraphenol ethoxide, and nitronium tetraphenoxy ethoxide.
- examples of the oxymetal compound include an oxymetal compound obtained by a transesterification reaction between the oxymetal compound and an alcohol compound or a phenol compound.
- these oxymetal compounds can be used alone or in combination of two or more.
- the metal oxide contained in the composition for forming a lower layer film for lithography of the present invention can be obtained by a hydrolysis reaction of the oxymetal compound.
- the hydrolysis reaction can be performed, for example, by adding the oxymetal compound and water to an organic solvent and stirring.
- a catalyst may be used as necessary.
- the hydrolysis reaction is performed using 5 to 40 parts by mass, preferably 9 to 36 parts by mass, more preferably 14 to 27 parts by mass of water with respect to 100 parts by mass of the oxymetal compound. It is.
- the reaction temperature of a hydrolysis reaction is 0-50 degreeC, Preferably it is 10-30 degreeC.
- the reaction time is from 0.1 to 10 hours, preferably from 0.2 to 5 hours, more preferably from 0.3 to 2 hours.
- a catalyst may be used in the hydrolysis reaction.
- the catalyst is used in an amount of 0.1 to 20 parts by mass, preferably 0.3 to LO parts by mass, and more preferably 0.5 to 3 parts by mass with respect to 100 parts by mass of the oxy metal compound.
- Catalysts include sulfuric acid, phosphoric acid, nitric acid, hydrochloric acid, acetic acid, formic acid, oxalic acid, fumaric acid, pyridinium-p-toluenesulfonate, propionic acid, p-toluenesulfonic acid, acetic anhydride and butyric acid.
- An acidic compound such as can be used.
- metal salts such as aluminum nitrate and aluminum sulfate can be used as a catalyst.
- the hydrolysis reaction can be carried out in an organic solvent.
- the organic solvent include ethylene glycol monomethenoate ethere, ethinorecello sonolebacetate, diethyleneglycolomerenoethyl ether, propylene glycol, propylene glycolenomonomethinoreether, propylene glycolenomonoethylenoate acetate, propylene Glyconorepropinole ether acetate, toluene, methyl ethyl ketone, cyclohexanone, 2-hydroxypro Ethyl pionate, 2-hydroxy 2-methylpropionate, ethoxy acetate, methyl pyruvate, ethyl lactate, butyl lactate and the like can be used.
- the organic solvent is used in an amount of 100 to 10,000 parts by weight, preferably 500 to 5000 parts by weight, more preferably 1000 to 3000 parts by weight with respect to 100 parts by weight of the oxymetal compound.
- the metal oxide obtained by the hydrolysis reaction is considered to have a metal oxygen metal (MOM) bond and a repeating structure as a repeating unit structure.
- MOM metal oxygen metal
- zirconium tetrabutoxide zirconium is tetravalent, so the metal oxide produced by the hydrolysis reaction is represented by the formula (2):
- the hydrolysis reaction of the oxymetal compound can be carried out by adding an organic compound having a carboxyl group or a phenolic hydroxyl group.
- the hydrolysis reaction can also be carried out by adding a nitrogen-containing compound having a nitrogen atom substituted with a hydroxymethyl group or an alkoxymethyl group. It is considered that these organic compounds and nitrogen-containing compounds can react with the oxymetal compound during the hydrolysis reaction. As a result, these organic compounds and nitrogen-containing compounds are considered to be incorporated into metal oxides.
- the addition amount of these organic compounds and nitrogen-containing compounds is 1 to 60 parts by mass, preferably 2 to 40 parts by mass, more preferably 3 to 30 parts by mass, and most preferably 5 to 100 parts by mass of the oxymetal compound. ⁇ : LO part by mass.
- Examples of the organic compound having a carboxyl group or a phenolic hydroxyl group include phthalic acid, Examples include terephthalic acid, benzoic acid, polyacrylic acid, polyhydroxystyrene, naphthol, phenol, cresol, phenol novolak, and bisphenol.
- Nitrogen-containing compounds having a nitrogen atom substituted with a hydroxymethyl group or an alkoxymethyl group include hexamethoxymethylmelamine, tetramethoxymethylbenzoguanamine, 1,3,4,6-tetrakis (butoxymethyl) glycol.
- methoxymethyl type melamine compound (trade name: Cymel 300, Cymel 301, Cymel 303, Cymel 350), butoxymethyl type melamine compound (Product name: My Coat 50 6, My Coat) 508) and glycoluril compounds (trade names: Cymel 1170, Powderlink 1174) and the like.
- the hydrolysis reaction of the oxymetal compound can also be carried out by adding another oxymetal compound containing a metal atom other than those described above.
- examples of other oxymetal compounds include titanium compounds, tantalum compounds, and silane compounds.
- titanium compound examples include tetramethoxy titanium, tetraethoxy titanium, tetrisopropoxy titanium, tetrabutoxy titanium, tetrabenzyloxy titanium, and tetraphenoxy titanium.
- tantalum compound examples include tantalum methoxide, tantalum ethoxide, tantalum isopropoxide, tantalum butoxide, tantalum phenoxide, tantalum furethoxide, and tantalum phenoxy ethoxide.
- silane compound examples include tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, tetrabutoxysilane, tetrapentinolexyloxysilane, and tetraphenoxysilane.
- the addition amount of the other oxymetal compound is 1 to 500 parts by mass, preferably 5 to 300 parts by mass, more preferably 10 to L00 parts by mass, or 100 parts by mass of the oxymetal compound, or 20 to 50 parts by mass.
- the composition for forming a lower layer film for lithography of the present invention includes an organic polymer compound, a photoacid generator, an inorganic fine particle, a surfactant and the like in addition to a metal oxide obtained by a hydrolysis reaction of an oxymetal compound. Can be included.
- the type of the organic polymer compound is not particularly limited.
- an addition polymerization polymer and a condensation polymerization polymer such as polyester, polystyrene, polyimide, acrylic polymer, methallyl polymer, polyvinyl ether, phenol novolak, naphthol novolak, polyether, polyamide, and polycarbonate can be used.
- Organic polymer compounds having an aromatic ring structure such as a benzene ring, naphthalene ring, anthracene ring, triazine ring, quinoline ring, and quinoxaline ring that function as a light absorption site are preferably used.
- Examples of the organic polymer compound having such an aromatic ring structure include benzyl acrylate, benzyl methacrylate, phenol acrylate, naphthyl acrylate, anthryl methacrylate, anthryl methyl methacrylate, styrene. And addition polymerization polymers containing a repeating monomer structure such as hydroxystyrene, benzyl vinyl ether and N-phenol maleimide as a repeating unit structure, and condensation polymerization polymers such as phenol novolak and naphthol novolak. Furthermore, examples of the organic polymer compound having an aromatic ring structure include organic polymer compounds having a structure of the following formulas (3) to (7) as a repeating unit structure.
- organic polymer compound a polymer having no aromatic ring structure can be used.
- organic polymer compound examples include alkyl acrylate, alcoholomethacrylate, vinylenoatenore, anolequinolevininoleatenore, attarylonitrile, maleimide, N-alkylmaleimide, and maleic acid.
- addition-polymerized polymers that contain only a non-aromatic ring structure, such as an anhydride, as a repeating unit structure.
- an addition-polymerized polymer is used as the organic polymer compound, homopolymers can also be used. May be combined ⁇ .
- An addition polymerizable monomer is used for the production of the addition polymerization polymer.
- acrylic acid methacrylic acid
- acrylic acid ester compounds methacrylic ester compounds
- acrylamide compounds methacrylamide compounds
- vinyl compounds styrene compounds
- maleimide compounds maleic anhydride.
- acrylic ester compounds include methyl acrylate, ethyl acrylate, normal hexyl acrylate, isopropyl acrylate, cyclohexyl acrylate, benzyl acrylate, phenyl acrylate, anthryl methyl.
- Atarylate 2-hydroxyethyl acrylate, 3 Black mouth 2 Hydroxypropyl acrylate, 2 Hydroxypropyl acrylate, 2, 2, 2-Trifluoroethyl acrylate, 2, 2, 2-Trichloroethyl Lilate, 2 Bromoethyl Atylate, 4-Hydroxybutyl Atylate, 2-Methoxyethyl Atylate, Tetrahydrofurfuryl Atalylate, 2-Methyl-2-adamantyl Atalylate, 5 Attaroyloxy 6 Hydroxynorbornene 2 Carboxylitz 1 Taton, 3 Atari b trimethoxy silane, and glycidyl Atari les over preparative like.
- Examples of the methacrylic acid ester compound include methyl methacrylate, ethyl methacrylate, normal hexyl methacrylate, isopropyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, and phenol methacrylate.
- Examples of the acrylamide compound include acrylamide, N-methylacrylamide, N-ethylacrylamide, N-benzylacrylamide, N-phenylacrylamide, N, N-dimethylacrylamide, and N-anthrylacrylamide.
- the methacrylamide compounds include methacrylamide, N-methylmethacrylamide, Nethylmethacrylamide, N-benzylmethacrylamide, N-phenylmethacrylamide, N, N-dimethylmethacrylamide, and N-anne. And tolylacrylamide.
- bull compound examples include bull alcohol, 2-hydroxyethyl vinyl ether, Chinorevinino reetenore, ethino levino ree tenole, benzeno levino ree tenole, vinore acetic acid, butyltrimethoxysilane, 2-chloroethyl vinyl ether, 2-methoxy ethyl bi
- styrene compound examples include styrene, hydroxystyrene, chlorostyrene, bromostyrene, methoxystyrene, cyanostyrene, and acetyl styrene.
- maleimide compounds include maleimide, N-methylmaleimide, N-phenol maleimide,
- N cyclohexyl maleimide N benzyl maleimide, N hydroxyethyl maleimide and the like.
- the content thereof is 0.1 to 50% by mass, preferably 1 to 25% by mass, more preferably 5% in the solid content.
- the molecular weight of the organic polymer compound is, for example, 1000 to 100000, preferably ⁇ 3,000 to 300,000, more preferably ⁇ 5000 to 200,000, and most preferably ⁇ 1000 to 100,000 as the weight average molecular weight.
- composition for forming a lower layer film for lithography of the present invention may also contain a photoacid generator.
- the photoacid generator generates an acid upon exposure of the photoresist. Therefore, the acidity of the lower layer film can be adjusted. This is one method for matching the acidity of the lower layer film with that of the upper layer photoresist. Moreover, the pattern shape of the photoresist formed in the upper layer can be adjusted by adjusting the acidity of the lower layer film.
- Examples of the photoacid generator include an olum salt compound, a sulfonimide compound, and a disulfol diazomethane compound.
- salt salts include diphenyl-hexahexafluorophosphate, diphenyl-trifnoroleolomethanesulphonate, diphenyl-ordinum nonaf, orononorema.
- Norebutans norephonate Diphenenoredonum perf Noroleolono Norremanole Octane sulfonate, Diphenol-ordonum camphorsulfonate, Bis (4-tert butylphenol) oodo-umcamphorsulfonate Bis (4-tert-butylphenol) ododonium trifluoromethanesulfonate and other ododonium salt compounds, and trif-norresnoroleum hexafnoreo oral antimonate, trifene-noresnoreformumonafluoro- n -butanesulfonate , Triphenylsulfur-umcamphor sulfonate And sulfo-sulfuric chloride compounds such as trisulfol-mu-trifluoromethanesulfonate.
- Examples of the sulfonimide compound include N- (trifluoromethanesulfo-loxy) succinimide, N- (nonafluoro-normalbutanesulfo-loxy) succinimide, N (camphorsulfo-loxy) succinimide and N (trifluoro). And romethanesulfuroxy) naphthalimide.
- disulfo-diazomethane compound examples include bis (trifluoromethylsulfo) diazomethane, bis (cyclohexylsulfoyl) diazomethane, bis (phenylsulfo) diazomethane, and bis (p toluenesulfo- E) diazomethane, bis (2,4 dimethylbenzenesulfol) diazomethane, and methylsulfolulu p-toluenesulfol diazomethane.
- the photoacid generator can be used alone or in combination of two or more.
- the content thereof is 0.01 to 10% by mass, preferably 0.1 to 5% by mass in the solid content. More preferably, it is 0.5 to 2% by mass.
- composition for forming a lower layer film for lithography of the present invention may also contain inorganic fine particles.
- Inorganic fine particles include titanium nitride, titanium oxynitride, silicon nitride, silicon oxynitride, tantalum nitride, tantalum oxynitride, tungsten oxide nitride, tungsten oxynitride, and cerium nitride. , Cerium oxynitride, germanium nitride, germanium oxynitride, hafnium nitride, hafnium oxynitride, cesium nitride, cesium oxynitride, gallium nitride, gallium oxynitride, etc. Is mentioned.
- the inorganic fine particles preferably have a particle diameter of 1 to: LOOnm or 2 to: LOnm.
- the content thereof is 0.1 to 30% by mass, preferably 1 to 10% by mass, more preferably 2% in the solid content. ⁇ 5% by weight.
- the composition for forming an underlayer film for lithography according to the present invention includes, in addition to the above, a crosslinkable compound, a crosslinking catalyst, a surfactant, a rheology modifier, a polymer dispersant, and an adhesive as necessary. An adjuvant or the like can be added. Surfactants are effective in suppressing the generation of pinholes and strains.
- the rheology modifier improves the fluidity of the lower layer film-forming composition, and is effective in increasing the filling property of the lower layer film-forming composition into the holes, particularly in the firing step.
- Adhesion aids are effective in improving the adhesion between the semiconductor substrate or photoresist and the underlying film.
- crosslinkable compound examples include nitrogen-containing compounds having a nitrogen atom substituted with the hydroxymethyl group or alkoxymethyl group.
- the content thereof is 1 to 50% by mass, preferably 2 to 30% by mass, more preferably 3% in the solid content. ⁇ 10% by weight.
- the composition for forming a lower layer film for lithography of the present invention contains a crosslinkable compound, it can also contain a crosslinking catalyst.
- a crosslinking catalyst By using a crosslinking catalyst, the crosslinking reaction of the crosslinkable compound is promoted.
- the crosslinking catalyst include methanesulfonic acid, trifluoromethanesulfonic acid, ⁇ -toluenesulfonic acid, pyridinium- ⁇ -toluenesulfonic acid, sulfosalicylic acid, 4-chlorobenzene sulfonic acid, 4-hydroxybenzenesulfone.
- sulfonic acid compounds such as acid, benzenedisulfonic acid, 1-naphthalenesulfonic acid, camphorsulfonic acid, sulfosalicylic acid, and pyridinium 1 naphthalenesulfonic acid.
- the crosslinking catalyst can be used alone or in combination of two or more.
- the content thereof is 0.1 to 50 parts by mass, preferably 1 to 10 parts by mass with respect to 100 parts by mass of the crosslinkable compound. .
- surfactant examples include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene ethylene ether, and polyoxyethylene octyl phenol ether.
- Polyoxyethylene alkylaryl ethers such as polyoxyethylene nonylphenol ether, polyoxyethylene polyoxypropylene Rock copolymers, sorbitan monolaurate, sorbitan monopalmitate, sonorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan fatty acid esters such as sorbitan tristearate, polyoxyethylene sorbitan monolaurate, poly Nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters such as oxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan tristearate
- Product names F-Top EF301, EF303, EF352 manufactured by Tochem Product Co., Ltd.
- product names MegaFuck F171, F173, R—08, R—30 Dainippon Ink Chemical Co., Ltd.
- surfactants can be used alone or in combination of two or more.
- the content thereof is 0.0001 to 5% by mass, preferably 0.001 to 2% by mass in the solid content.
- polymer dispersant examples include polyoxyethylene alkyl ethers, polyoxyethylene alkyl ethers, polyethylene glycol diesters, sorbitol ethylene oxide-encapsulated sorbitol propylene oxide encapsulated polymers.
- Sorbitol ethylene oxide / propylene oxide mixed case polyethylene polyamine ethylene oxide case, polyethylene polyamine propylene oxide case, polyethylene polyamine ethylene oxide Copolymerization of propylene oxide mixed adducts, carbonates with ethylene oxide of norphenol ether formalin condensates, poly (meth) acrylates, carboxyl group-containing unsaturated monomers and other bur compounds Body salt, poly (meth) acrylic Partial alkyl esters of acids or salts thereof, polystyrene sulfonates, formalin condensates of naphthalene sulfonate, polyalkylenepolyamines, sorbitan fatty acid esters, fatty acid-modified polyesters, polyamides, tertiary amine-modified polyurethanes , And tertiary amine-modified polyesters can be used.
- any solvent can be used as long as it can dissolve the solid component.
- solvents include methyl solvate acetoacetate, ethyl cetyl solvate acetate, propylene glycol, propylene glycol monomono methinole ether, propylene glycol enomono chinole ether, propylene glycol eno mono methino ethenore acetate, propylene Glycole monoethanolate oleorecetate, Propylene glycoleno monopropino oleate, N-acetate, Propylene glycol monobutino reeenoate acetate, Tonolene, Xylene, Methylethylketone, Cyclopentanone, Cyclohexanone, 2-hydroxy Ethyl propionate, 2-hydroxy 2-methyl 2-methyl propionate, e
- Substrates used in the manufacture of semiconductor devices eg, silicon wafer substrates, silicon ⁇ silicon dioxide coated substrates, silicon nitride substrates, glass substrates, ⁇ substrates, polyimide substrates, and low-k materials
- the composition for forming a lower layer film for lithography of the present invention is applied onto a coated substrate or the like by an appropriate coating method such as a spinner or a coater, and then the lower layer film is formed by baking.
- the firing conditions are appropriately selected from firing temperatures of 100 ° C. to 400 ° C. and firing times of 0.5 to 60 minutes.
- the firing temperature is preferably 150 ° C. to 250 ° C., more preferably 185 ° C.
- the thickness of the lower layer film is, for example, 1 to: L000 nm, preferably 10 to 500 nm, and more preferably 50 to LOONm.
- a photoresist layer is formed on the lower layer film.
- the formation of the photoresist layer can be performed by a well-known method, that is, by applying a photoresist composition solution onto the lower layer film and baking.
- the film thickness of the photoresist is, for example, 50 to: LOOOOnm.
- any of a general-purpose negative photoresist and a positive photoresist without particular limitation can be used.
- photoresists include novolak resin and 1,2-naphthoquinonediazide sulfonate, a positive photoresist that can also be dissolved, decomposed by acid and dissolved in alkali.
- a chemically amplified photoresist having a binder with a speed increasing group and a photoacid generator, a low molecular weight compound that decomposes with an acid to increase the alkali dissolution rate of the photoresist, an alkali soluble binder, and a photoacid generator A chemically amplified photoresist comprising a binder having a group that decomposes with acid to increase the alkali dissolution rate, a low molecular weight compound that decomposes with acid to increase the alkali dissolution rate of the photoresist, and a photoacid generator.
- chemical amplification type photoresists for example, trade name APEX-E manufactured by Shipley Co., Ltd., trade name PAR710 manufactured by Sumitomo Chemical Co., Ltd., and trade name SEPR430 manufactured by Shin-Etsu Chemical Co., Ltd.
- the semiconductor substrate covered with the lower layer film and the photoresist layer is exposed through a predetermined mask.
- a KrF excimer laser (wavelength 248 nm), an ArF excimer laser (wavelength 193 nm), an F2 excimer laser (wavelength 157 nm), or the like can be used.
- post exposure bake can also be performed.
- the post-exposure heating conditions are appropriately selected from a heating temperature of 70 ° C to 150 ° C and a heating time of 0.3 to L0 minutes.
- developers include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, and choline.
- alkali metal hydroxides such as potassium hydroxide and sodium hydroxide
- hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, and choline.
- examples include an aqueous solution of quaternary ammonium oxide and an alkaline aqueous solution such as an aqueous amine solution such as ethanolamine, propylamine, and ethylenediamine.
- a surfactant or the like can be added to these developers.
- the development conditions are appropriately selected from a temperature of 5 to 50 ° C and a time of 10 to 300 seconds.
- the portion of the lower layer film from which the photoresist has been removed is removed by dry etching to expose the semiconductor substrate.
- a chlorine-based gas for dry etching of the lower layer film.
- photoresists consisting essentially of organic substances are difficult to remove.
- the lower layer film of the present invention containing a large amount of the metal oxide that is an inorganic substance is quickly removed by the chlorine-based gas. Therefore, it is possible to suppress a decrease in the thickness of the photoresist film due to the dry etching of the lower layer film. And that As a result, the photoresist can be used as a thin film.
- the chlorine-based gas include dichloroborane, trichloroborane, chlorine, carbon tetrachloride, and black mouth form.
- the semiconductor substrate is processed using the patterned photoresist and the film made of the lower layer film as a protective film.
- the processing of the semiconductor substrate is preferably performed by dry etching with a fluorine-based gas.
- the lower layer film of the present invention containing a large amount of an inorganic substance is difficult to remove by dry etching with a fluorine-based gas.
- fluorine-based gas examples include tetrafluoromethane, perfluorocyclobutane (C
- an organic antireflection film can be formed on the upper layer of the lower layer film of the present invention before applying and forming a photoresist.
- the antireflective coating composition used therefor there are no particular restrictions on the antireflective coating composition used therefor, and it is possible to arbitrarily select and use the intermediate force that has been conventionally used in the lithography process.
- conventional methods such as spinners can be used.
- an antireflection film can be formed by coating and baking with a coater.
- An underlayer film formed from the composition for forming an underlayer film for lithography of the present invention may also have absorption for light depending on the wavelength of light used in the lithospheric process. In such a case, it functions as a layer having an effect of preventing reflected light from the substrate.
- the lower layer film of the present invention is a layer for preventing the interaction between the substrate and the photoresist, the material used for the photoresist, or the substance generated upon exposure to the photoresist to prevent the adverse effect on the substrate. This layer can also be used as a layer to prevent diffusion of the material that generates semiconductor substrate force upon firing into the upper photoresist.
- the solution of the underlayer film forming composition obtained in Example 1 was applied onto a silicon wafer substrate using a spinner. Baking was performed at 205 ° C for 5 minutes on a hot plate to form a lower layer film (film thickness 400 nm). This underlayer film was dipped in ethyl acetate and propylene glycol monomethyl ether, which are solvents used for photoresist, and confirmed to be insoluble in these solvents.
- an underlayer film (film thickness: 400 nm) was formed on a silicon wafer substrate from the solution of the underlayer film forming composition obtained in Example 1.
- a photoresist solution (product name: APEX-E, manufactured by Shipley Co., Ltd.) was applied to the upper layer of this lower layer film using a spinner.
- a photoresist was formed by baking at 90 ° C. for 1 minute on a hot plate. Then, after exposing the photoresist, heating after exposure was performed at 90 ° C. for 1.5 minutes. After developing the photoresist, the thickness of the lower layer film was measured, and it was confirmed that intermixing between the lower layer film and the photoresist occurred.
- an underlayer film (film thickness: 300 nm) was formed on a silicon wafer substrate from the solution of the underlayer film forming composition obtained in Example 1. Then, when the refractive index (n value) and attenuation coefficient (k value) at a wavelength of 193 nm of the lower layer film were measured with a spectroscopic ellipsometer, the refractive index was 1.88 and the attenuation coefficient was 0.22. It was.
- an underlayer film (film thickness: 400 nm) was formed on a silicon wafer substrate from the solution of the underlayer film forming composition obtained in Example 1. Then, using a RIE system ES401 manufactured by Nippon Scientific, under the condition that CF is used as the dry etching gas,
- Example 2 The dry etching rate of the layer film was measured. The etching rate was 29. OnmZ seconds. [0080] Example 2
- the solution of the underlayer film forming composition obtained in Example 2 was applied onto a silicon wafer substrate using a spinner. Baking was performed at 205 ° C for 5 minutes on a hot plate to form a lower layer film (film thickness 400 nm). This underlayer film was dipped in ethyl acetate and propylene glycol monomethyl ether, which are solvents used for photoresist, and confirmed to be insoluble in these solvents.
- a lower layer film (film thickness: 400 nm) was formed on a silicon wafer substrate from the solution of the lower layer film forming composition obtained in Example 2.
- a photoresist solution product name: APEX-E, manufactured by Shipley Co., Ltd.
- a photoresist was applied to the upper layer of this lower layer film using a spinner.
- a photoresist was formed by baking at 90 ° C. for 1 minute on a hot plate. Then, after exposing the photoresist, heating after exposure was performed at 90 ° C. for 1.5 minutes. After developing the photoresist, the thickness of the lower layer film was measured, and it was confirmed that intermixing between the lower layer film and the photoresist occurred.
- a lower layer film (film thickness: 300 nm) was formed on a silicon wafer substrate from the solution of the lower layer film forming composition obtained in Example 2. Then, when the refractive index (n value) and attenuation coefficient (k value) at a wavelength of 193 nm of the lower layer film were measured with a spectroscopic ellipsometer, the refractive index was 1.72 and the attenuation coefficient was 0.12. It was.
- a lower layer film (film thickness: 400 nm) was formed on a silicon wafer substrate from the solution of the lower layer film forming composition obtained in Example 2.
- RIE made by Nippon Scientific Under system ES401, under the condition that CF is used as dry etching gas,
- the dry etching rate of the layer film was measured.
- the etching rate was 28.7 nmZ seconds.
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Abstract
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| JP2006540877A JP4793583B2 (ja) | 2004-10-14 | 2005-10-03 | 金属酸化物を含むリソグラフィー用下層膜形成組成物 |
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| JP2004299716 | 2004-10-14 | ||
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| PCT/JP2005/018294 Ceased WO2006040956A1 (ja) | 2004-10-14 | 2005-10-03 | 金属酸化物を含むリソグラフィー用下層膜形成組成物 |
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| JP (1) | JP4793583B2 (ja) |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2063319A1 (en) | 2007-11-22 | 2009-05-27 | Shin-Etsu Chemical Co., Ltd. | Metal oxide-containing film-forming composition, metal oxide-containing film, metal oxide-containing film-bearing substrate, and patterning method |
| US8029974B2 (en) | 2008-10-02 | 2011-10-04 | Shin-Etsu Chemical Co., Ltd. | Metal oxide-containing film-forming composition, metal oxide-containing film-formed substrate, and patterning process |
| WO2012133597A1 (ja) * | 2011-03-30 | 2012-10-04 | Jsr株式会社 | 多層レジストプロセスパターン形成方法及び多層レジストプロセス用無機膜形成組成物 |
| JP2013076973A (ja) * | 2011-09-15 | 2013-04-25 | Jsr Corp | パターン形成方法 |
| US8852844B2 (en) | 2008-10-02 | 2014-10-07 | Shin-Etsu Chemical Co., Ltd. | Composition for forming silicon-containing film, silicon-containing film-formed substrate and patterning process |
| WO2015012177A1 (ja) * | 2013-07-24 | 2015-01-29 | Jsr株式会社 | パターン形成方法 |
| JP2016207898A (ja) * | 2015-04-24 | 2016-12-08 | 積水化学工業株式会社 | 半導体接合用接着剤 |
| JPWO2015053194A1 (ja) * | 2013-10-07 | 2017-03-09 | 日産化学工業株式会社 | ポリ酸を含むメタル含有レジスト下層膜形成組成物 |
| KR101783509B1 (ko) | 2013-01-08 | 2017-09-29 | 신에쓰 가가꾸 고교 가부시끼가이샤 | 금속 산화물 함유막 형성용 조성물 및 패턴 형성 방법 |
| JPWO2023136260A1 (ja) * | 2022-01-14 | 2023-07-20 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101674989B1 (ko) | 2013-05-21 | 2016-11-22 | 제일모직 주식회사 | 레지스트 하층막용 조성물, 이를 사용한 패턴 형성 방법 및 상기 패턴을 포함하는 반도체 집적회로 디바이스 |
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| US8852844B2 (en) | 2008-10-02 | 2014-10-07 | Shin-Etsu Chemical Co., Ltd. | Composition for forming silicon-containing film, silicon-containing film-formed substrate and patterning process |
| US8029974B2 (en) | 2008-10-02 | 2011-10-04 | Shin-Etsu Chemical Co., Ltd. | Metal oxide-containing film-forming composition, metal oxide-containing film-formed substrate, and patterning process |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI370329B (en) | 2012-08-11 |
| JPWO2006040956A1 (ja) | 2008-05-15 |
| TW200619853A (en) | 2006-06-16 |
| JP4793583B2 (ja) | 2011-10-12 |
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