WO2016117347A1 - ポジ型感光性樹脂組成物、パターン硬化膜の製造方法、パターン硬化膜及び電子部品 - Google Patents
ポジ型感光性樹脂組成物、パターン硬化膜の製造方法、パターン硬化膜及び電子部品 Download PDFInfo
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- WO2016117347A1 WO2016117347A1 PCT/JP2016/000323 JP2016000323W WO2016117347A1 WO 2016117347 A1 WO2016117347 A1 WO 2016117347A1 JP 2016000323 W JP2016000323 W JP 2016000323W WO 2016117347 A1 WO2016117347 A1 WO 2016117347A1
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- SQJVWXMOEPVFED-UHFFFAOYSA-N CS(c1cccc(C2=O)c1C=CC2=N)(=O)=O Chemical compound CS(c1cccc(C2=O)c1C=CC2=N)(=O)=O SQJVWXMOEPVFED-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
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- 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
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
- C08G69/32—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound
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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
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/22—Polybenzoxazoles
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/02—Halogenated hydrocarbons
- C08K5/03—Halogenated hydrocarbons aromatic, e.g. C6H5-CH2-Cl
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/41—Compounds containing sulfur bound to oxygen
- C08K5/42—Sulfonic acids; Derivatives thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
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- G—PHYSICS
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- 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
- G03F7/022—Quinonediazides
- G03F7/0226—Quinonediazides characterised by the non-macromolecular additives
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- G—PHYSICS
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- 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
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- G03F7/023—Macromolecular quinonediazides; Macromolecular additives, e.g. binders
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- 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
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- G03F7/022—Quinonediazides
- G03F7/023—Macromolecular quinonediazides; Macromolecular additives, e.g. binders
- G03F7/0233—Macromolecular quinonediazides; Macromolecular additives, e.g. binders characterised by the polymeric binders or the macromolecular additives other than the macromolecular quinonediazides
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- G—PHYSICS
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- 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
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
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- G—PHYSICS
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- 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
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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
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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
- G03F7/40—Treatment after imagewise removal, e.g. baking
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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
- C08G71/00—Macromolecular compounds obtained by reactions forming a ureide or urethane link, otherwise, than from isocyanate radicals in the main chain of the macromolecule
- C08G71/04—Polyurethanes
Definitions
- the present invention relates to a positive photosensitive resin composition, a method for producing a patterned cured film, a patterned cured film, and an electronic component.
- polybenzoxazole Because polybenzoxazole has good heat resistance and high stability against various chemicals, it is applied as a circuit surface protective film material for semiconductor elements and a rewiring layer forming material for wafer level packages (patent) References 1, 2).
- Polybenzoxazole is coated with a positive photosensitive resin composition in which a precursor thereof and a diazonaphthoquinone compound (naphthoquinonediazide compound) are combined, dried, and then cured by heating through an exposure and development process.
- a patterned cured film containing polybenzoxazole can be easily obtained.
- a patterned cured film in which only the connection terminal portion of the semiconductor element circuit is opened can be obtained (Patent Documents 3 and 4).
- external connection terminals called bumps made of solder or copper are formed in the opened pattern portion.
- positive photosensitive resin compositions have been used in the range of a film thickness after curing of about 5 to 10 ⁇ m. Therefore, the exposure and development processes are set to have a film thickness of about 10 to 15 ⁇ m in consideration of film thickness reduction and curing shrinkage during development.
- the film thickness is required to be 15 ⁇ m or more after curing, and it is necessary to perform exposure and development with a film thickness of 20 ⁇ m or more in consideration of a decrease in film thickness during development or curing.
- the dissolution rate of the exposed portion in the alkaline aqueous solution is faster than the dissolution rate of the unexposed portion (because of the dissolution contrast (the ratio of the dissolution rate of the exposed portion to the dissolution rate of the unexposed portion)), pattern formation is possible. It becomes possible.
- the present inventors tried to form a pattern with a film thickness of 20 ⁇ m or more using a conventional positive photosensitive resin composition, and as a result, in the exposed area, the exposed light was sufficiently transmitted to the bottom of the film.
- the diazonaphthoquinone compound was not sufficiently converted to indenecarboxylic acid, and an opening pattern could not be formed.
- the development time since the amount of resin that must be dissolved and removed increases, the development time may be long. Even in unexposed areas, dissolution in the developer gradually progresses, resulting in a low residual film ratio (ratio of the film thickness after development to the initial film thickness) or pattern peeling. was there.
- the present inventors have combined a polybenzoxazole precursor having a specific structure, a diazonaphthoquinone compound, and an iodonium compound having a specific structure to achieve a thickness of 20 ⁇ m or more.
- the present inventors completed the present invention by discovering that even when an attempt was made to form a pattern with a thick film, it was possible to develop within a practical development time, and a pattern could be formed while maintaining a high residual film ratio.
- the following positive photosensitive resin composition and the like are provided. 1.
- a positive photosensitive resin composition comprising the following components (a) to (e):
- (B) Crosslinker (c) Diazonaphthoquinone compound
- the component (a) is a polybenzoxazole precursor having a structure represented by the following general formula (4).
- a and B are structural units; U is a divalent organic group, V is a divalent organic group containing an aliphatic chain structure or an alicyclic structure, W is a divalent organic group, X is a divalent organic group not containing an aliphatic chain structure and an alicyclic structure.
- the positive photosensitive resin composition of 1 or 2 containing the following (a ') component.
- a ′ a polybenzoxazole precursor having a structural unit represented by the following general formula (5) and not having a structural unit represented by the general formula (1) (Wherein, W is a divalent organic group, and X is a divalent organic group not including an aliphatic chain structure and an alicyclic structure.) 4).
- W is a divalent organic group
- X is a divalent organic group not including an aliphatic chain structure and an alicyclic structure.
- the resin film has a thickness of 20 ⁇ m or more, 6.
- An electronic component comprising the patterned cured film according to 8.7.
- the positive photosensitive resin composition and pattern cured film which have favorable developability and a residual film rate, and its manufacturing method can be provided.
- the positive photosensitive resin composition of the present invention uses a polybenzoxazole precursor that exhibits a high transmittance with respect to an exposure wavelength (365 nm) by introducing a specific structure, and uses diazo at the bottom of the thick film. It is possible to sufficiently expose the naphthoquinone compound, and by combining an iodonium compound having a specific structure, it is possible to suppress the dissolution rate of the unexposed part and accelerate the dissolution rate of the exposed part. Even when a pattern cured film is formed, it is excellent in workability (development is possible within a practical development time), and a good pattern can be formed while maintaining a high residual film ratio.
- a or B only needs to include either A or B, and may include both.
- process is not limited to an independent process, and even if it cannot be clearly distinguished from other processes, the term “process” is used as long as the intended action of the process is achieved. included.
- the numerical range indicated by using “to” indicates a range including the numerical values described before and after “to” as the minimum value and the maximum value, respectively.
- each component in the composition is the sum of the plurality of substances present in the composition unless there is a specific indication when there are a plurality of substances corresponding to each component in the composition. Means quantity.
- the exemplary materials may be used singly or in combination of two or more unless otherwise specified.
- the positive photosensitive resin composition of the present invention includes the following components (a) to (e).
- a polybenzoxazole precursor containing a structural unit represented by the following general formula (1) In the formula, U is a divalent organic group, and V is a divalent organic group containing an aliphatic chain structure or an alicyclic structure.
- B Crosslinker
- Iodonium compound represented by the following general formula (2) or (3) wherein R 1 to R 12 and R 14 to R 24 are each a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a fluorine atom, an alkyl group, an alkenyl group, an alkoxyl group, a trialkylsilyl group, A group in which some or all of the hydrogen atoms in the group are substituted with fluorine atoms, R 13 is an alkyl group, and two R 1 to R 5 and R 13 may be the same
- the polybenzoxazole precursor as the component (a) is not particularly limited as long as it includes a part of the structural unit represented by the following general formula (1).
- U is a divalent organic group
- V is a divalent organic group containing an aliphatic chain structure or an alicyclic structure.
- a group having an aliphatic structure having 1 to 30 carbon atoms preferably 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms
- a group containing the structure represented by a following formula R 101 and R 102 are each independently a hydrogen atom, a fluorine atom, an alkyl group having 1 to 6 carbon atoms or a fluorinated alkyl group having 1 to 6 carbon atoms, and a is an integer of 1 to 30 is there.
- R 101 and R 102 are preferably a methyl group or a trifluoromethyl group, and more preferably a trifluoromethyl group. Further, a is preferably an integer of 1 to 5.
- V is preferably a group having an aliphatic chain structure having 1 to 30 carbon atoms (preferably 3 to 20 carbon atoms, more preferably 5 to 15 carbon atoms) (preferably an alkylene group or a fluorinated alkylene group).
- the group containing an alicyclic structure may be substituted with an alkyl group having 1 to 6 carbon atoms.
- the polybenzoxazole precursor containing the structural unit shown by following General formula (4) can be used as a polybenzoxazole precursor containing the structural unit represented by General formula (1).
- the polybenzoxazole precursor may be a copolymer composed of structural units A and B.
- the copolymer may be a block copolymer or a random copolymer.
- a and B are structural units
- U is a divalent organic group
- V is a divalent organic group containing an aliphatic chain structure or an alicyclic structure.
- U and V are the same as U and V in the general formula (1).
- W is a divalent organic group
- X is a divalent organic group not including an aliphatic chain structure and an alicyclic structure.
- W is the same as U in the general formula (1).
- X is preferably a group containing an aromatic ring (preferably a benzene ring or a naphthalene ring). Specifically, the following groups are more preferable. These groups may be substituted with halogen. In the formula, A is a single bond, —O— or —S—.
- the polybenzoxazole precursor used in the present invention is, for example, a polyamide structural unit other than the structural unit of the general formula (1), a polybenzoxazole structural unit, a polyimide or a polyimide precursor (polyamic acid or polyamic acid ester).
- You may have a structural unit with the structural unit of the said General formula (1), and the structural unit A and the structural unit B of the said General formula (4) in the case of being a copolymer.
- the photosensitive resin composition contains a polybenzoxazole precursor containing the structural unit of the general formula (1)
- the diazonaphthoquinone compound is converted to indenecarboxylic acid.
- a polybenzoxazole precursor having a structural unit of the following general formula (5) and not having a structural unit represented by the general formula (1) is added. It doesn't matter.
- W is a divalent organic group
- X is a divalent organic group not including an aliphatic chain structure and an alicyclic structure. W and X are the same as W and X in the general formula (4).
- the mixing ratio may be appropriately adjusted in consideration of i-line transmittance.
- the divalent organic group represented by U in the general formula (1), U and W in the general formula (4), and W in the general formula (5) is a hydroxyl group used for the synthesis of the polybenzoxazole precursor. It is a residue of group-containing diamines.
- hydroxyl group-containing diamine examples include bis (3-amino-4-hydroxyphenyl) sulfone, bis (4-amino-3-hydroxyphenyl) sulfone, and 2,2-bis (3-amino-4-hydroxyphenyl) -1 1,1,3,3,3-hexafluoropropane, 2,2-bis (4-amino-3-hydroxyphenyl) -1,1,1,3,3,3-hexafluoropropane, etc.
- bis (3-amino-4-hydroxyphenyl) sulfone bis (4-amino-3-hydroxyphenyl) sulfone
- 2,2-bis (3-amino-4-hydroxyphenyl) -1 1,1,3,3,3-hexafluoropropane 2,2-bis (4-amino-3-hydroxyphenyl) -1,1,1,3,3,3-hexafluoropropane, etc.
- V in the general formulas (1) and (4) is a divalent organic group. Specifically, it is a residue of a dicarboxylic acid that reacts with the hydroxyl group-containing diamine to form a polyamide structure, and includes an aliphatic chain structure or an alicyclic structure.
- the polybenzoxazole precursor introduced with these structures has improved transmittance for ultraviolet light and visible light, and when a thick cured film is formed, light easily reaches the bottom of the film.
- the dehydration ring-closing reaction of the polybenzoxazole precursor is likely to proceed at a low temperature, which is more preferable because of excellent curability.
- dicarboxylic acids having an aliphatic chain structure having 1 to 30 carbon atoms include malonic acid, dimethylmalonic acid, ethylmalonic acid, isopropylmalonic acid, di-n-butylmalonic acid, succinic acid, tetrafluorosuccinic acid, and methylsuccinic acid.
- n is an integer of 1 to 6
- dicarboxylic acid having an alicyclic structure examples include 1,1-cyclobutanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and 2,3-norbornanedicarboxylic acid. Acid, 1,3-adamantane dicarboxylic acid and the like.
- the dicarboxylic acids used as X in the general formulas (4) and (5) are dicarboxylic acids other than the dicarboxylic acids containing the aliphatic chain structure or the alicyclic structure, and are converted into polybenzoxazole.
- isophthalic acid terephthalic acid, 4,4'-dicarboxybiphenyl, 4,4'-dicarboxydiphenyl ether, 4,4'-dicarboxytetraphenylsilane, bis (4-carboxyphenyl)
- aromatic dicarboxylic acids such as sulfone, 5-bromoisophthalic acid, 5-fluoroisophthalic acid, 5-chloroisophthalic acid, and 2,6-naphthalenedicarboxylic acid.
- the amide bond portion containing a phenolic hydroxyl group is subjected to dehydration and ring closure at the time of curing, resulting in heat resistance, mechanical characteristics, Converted to a benzoxazole structure with excellent properties.
- the molecular weight of the polybenzoxazole precursor is preferably 3,000 to 200,000 in weight average molecular weight, more preferably 5,000 to 100,000, and further preferably 10,000 to 40,000.
- the weight average molecular weight can be measured by a gel permeation chromatography method with reference to the examples of the present specification.
- the method for producing the polybenzoxazole precursor is not particularly limited, and can be produced by a conventionally known method.
- the polybenzoxazole precursor having the structural unit represented by the general formula (1) can be generally synthesized from a dicarboxylic acid derivative and a hydroxy group-containing diamine. Specifically, it can be synthesized by converting a dicarboxylic acid derivative into a dihalide derivative and then reacting with the diamines.
- the positive photosensitive resin composition of the present invention contains a crosslinking agent as the component (b).
- the crosslinking agent is a compound that can be crosslinked or polymerized by heating. By including such a compound, it can react with the polybenzoxazole precursor during heat curing to form a crosslinked structure.
- the compounds can also be self-polymerized by heat treatment. For this reason, heat resistance, mechanical characteristics, and chemical resistance can be improved.
- the crosslinking agent as component (b) is not particularly limited, but is preferably a compound having a methylol group, an alkoxymethyl group, an epoxy group, an oxetanyl group or a vinyl ether group, and a compound having a methylol group or an alkoxymethyl group. More preferably.
- the compound that can be used as the component (b) specifically, compounds represented by the following general formulas (6) to (8) are preferable.
- the compound which has a 2 or more methylol group or an alkoxymethyl group is preferable at the point which can prevent the melt
- R 25 represents a hydrogen atom or an alkyl group
- R 26 represents an alkyl group
- p is an integer of 1 to 4
- q is an integer of 0 to 3
- p + q is an integer of 5 or less.
- two Y's are each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a fluoroalkyl group in which some or all of the hydrogen atoms are substituted with fluorine atoms, and some of the hydrogen atoms are hydroxyl groups.
- a hydroxyalkyl group substituted with a group, or an alkoxy group having 1 to 10 carbon atoms R 25 represents a hydrogen atom or an alkyl group, R 26 represents an alkyl group, and p is each independently an integer of 1 to 4 And r is each independently an integer of 0 to 3, and p + q is an integer of 5 or less, and when a plurality of R 25 or R 26 are present, they may be the same or different.
- two R 25 represent a hydrogen atom or an alkyl group.
- Two R 27 each independently represent a hydrogen atom or a monovalent organic group, and are bonded to each other to form a substituted or unsubstituted ring structure. It may be formed.
- the compound represented by the general formula (8) is particularly preferable from the viewpoint of obtaining a cured film having high chemical resistance even when cured at a low temperature of 200 ° C. or lower.
- the following compounds are preferably used.
- the content of the component (b) is preferably 1 to 50 parts by mass with respect to 100 parts by mass of the component (a) from the viewpoint of heat resistance of the cured film, and 5 to 40 from the viewpoint of improving chemical resistance and flux resistance. Mass parts are more preferable, and 10 to 35 parts by mass are even more preferable.
- the positive photosensitive resin composition of the present invention contains a diazonaphthoquinone compound as the component (c).
- a diazonaphthoquinone compound a conventionally known compound can be used without particular limitation.
- the diazonaphthoquinone compound can be obtained, for example, by subjecting o-quinonediazide sulfonyl chlorides to a hydroxy compound, an amino compound or the like in the presence of a dehydrochlorinating agent.
- o-quinonediazide sulfonyl chlorides examples include benzoquinone-1,2-diazide-4-sulfonyl chloride, naphthoquinone-1,2-diazide-5-sulfonyl chloride, naphthoquinone-1,2-diazide-4-sulfonyl chloride, and the like. Can be used.
- hydroxy compound examples include hydroquinone, resorcinol, pyrogallol, bisphenol A, bis (4-hydroxyphenyl) methane, 2,2-bis (4-hydroxyphenyl) hexafluoropropane, 2,3,4-trihydroxybenzophenone, 2 , 3,4,4′-tetrahydroxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, 2,3,4,2 ′, 3′-pentahydroxybenzophenone, 2,3,4,3 ′ , 4 ′, 5′-hexahydroxybenzophenone, bis (2,3,4-trihydroxyphenyl) methane, bis (2,3,4-trihydroxyphenyl) propane, 4b, 5,9b, 10-tetrahydro-1 , 3,6,8-tetrahydroxy-5,10-dimethylindeno [2,1-a Indene, tris (4-hydroxyphenyl) methane, it can be used tris (4-hydroxyphenyl) ethane
- amino compound examples include p-phenylenediamine, m-phenylenediamine, 4,4′-diaminodiphenyl ether, 4,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylsulfone, 4,4′-diaminodiphenyl sulfide, o-aminophenol, m-aminophenol, p-aminophenol, 3,3′-diamino-4,4′-dihydroxybiphenyl, 4,4′-diamino-3,3′-dihydroxybiphenyl, bis (3-amino -4-hydroxyphenyl) propane, bis (4-amino-3-hydroxyphenyl) propane, bis (3-amino-4-hydroxyphenyl) sulfone, bis (4-amino-3-hydroxyphenyl) sulfone, bis (3 -Amino-4-hydroxyphenyl) hexafluor
- the content of the diazonaphthoquinone compound may be appropriately adjusted in consideration of dissolution contrast and the like.
- the diazonaphthoquinone compound itself absorbs i-line and does not reach the bottom of the film, thereby preventing the resolution of the opening pattern from deteriorating.
- the amount is preferably 1 to 20 parts by mass, more preferably 5 to 15 parts by mass with respect to parts.
- the positive photosensitive resin composition of the present invention contains an iodonium compound represented by the general formula (2) or (3) as the component (d).
- an iodonium compound represented by the general formula (2) or (3) as the component (d).
- polybenzoxazole precursors have a weak interaction with diazonaphthoquinone compounds, so in order to sufficiently reduce the dissolution rate of unexposed areas, iodonium compounds that are dissolution inhibitors may be used in combination. is there.
- the diazonaphthoquinone compound is converted to indenecarboxylic acid by exposure and loses its interaction, the dissolution inhibition effect by the iodonium compound does not disappear, so the dissolution rate of the exposed area is suppressed, and the dissolution contrast decreases.
- Development time may become longer.
- the iodonium compound represented by the general formula (2) or (3) absorbs i-line and can be decomposed by exposure to lose the dissolution inhibiting effect.
- R 1 to R 12 and R 14 to R 24 are each a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a fluorine atom, an alkyl group (preferably having 1 to 10 carbon atoms, More preferably 1 to 6 carbon atoms), an alkenyl group (preferably 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms), an alkoxyl group (preferably 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms).
- a trialkylsilyl group (preferably having 1 to 30 carbon atoms, more preferably 1 to 18 carbon atoms), or a group in which part or all of the hydrogen atoms of each of the above groups are substituted with fluorine atoms.
- a hydrogen atom, an alkyl group, or a fluorinated alkyl group is preferable.
- R 13 is an alkyl group (preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms). The two R 1 to R 5 and R 13 may be the same or different.
- the iodonium compound represented by the general formula (2) or (3) is synthesized by mixing a metal salt of sulfonic acid or ammonium sulfonate with iodonium halide in hot water, and collecting the generated precipitate. Can do.
- any of the following compounds is particularly preferable.
- an iodonium compound represented by the general formula (9) may be used in combination for the purpose of adjusting the dissolution rate of the unexposed area and the exposed area.
- the content can be appropriately adjusted so that a desired dissolution contrast can be achieved.
- R 27 to R 31 are each a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a fluorine atom, an alkyl group (preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms), alkenyl A group (preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms), an alkoxy group (preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms), a trialkylsilyl group (preferably having a carbon number) 1 to 30, more preferably 1 to 18 carbon atoms), or a group in which some or all of the hydrogen atoms in each group are substituted with fluorine atoms
- Y 2 ⁇ represents
- Fluoride ion, nitrate ion, methanesulfonate ion, trifluoromethanesulfonate ion, hexafluorophosphate ion, benzenesulfonate ion or p-toluenesulfonate ion Represents
- the content of the iodonium compound is preferably 1 to 40 parts by mass and more preferably 3 to 30 parts by mass with respect to 100 parts by mass of the component (a).
- the component (e) used in the resin composition of the present invention includes ⁇ -butyrolactone, ethyl lactate, propylene glycol monomethyl ether acetate, benzyl acetate, n-butyl acetate, ethoxyethyl propionate, and 3-methylmethoxypropionate.
- N-methyl-2-pyrrolidone N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, hexamethylphosphorylamide, tetramethylene sulfone, cyclohexanone, cyclopentanone, diethyl ketone, diisobutyl ketone, methyl amyl ketone
- N-methyl-2-pyrrolidone N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, hexamethylphosphorylamide, tetramethylene sulfone, cyclohexanone, cyclopentanone, diethyl ketone, diisobutyl ketone, methyl amyl ketone
- the content of the solvent is not particularly limited, but is preferably 10 to 800 parts by weight, more preferably 50 to 500 parts by weight, and still more preferably 70 to 300 parts by weight with respect to 100 parts by weight of component (a). Alternatively, it is preferably prepared so that the proportion of the solvent in the composition is 20 to 90% by mass.
- composition of the present invention may consist essentially of the components (a) to (e).
- 70% by weight or more, 80% by weight or more, 90% by weight or more, or 95% by weight or more of the composition of the present invention may be the components (a) to (e).
- the positive photosensitive resin composition of the present invention includes (1) a silane coupling agent, (2) a surfactant or leveling agent, and (3) a rust inhibitor.
- You may contain components, such as a cyclization promoter. The content of these components can be appropriately adjusted so that desired characteristics are exhibited.
- the pattern cured film of the present invention is a pattern cured film of the positive photosensitive resin composition of the present invention.
- the manufacturing method of the pattern cured film by this invention is demonstrated.
- the pattern cured film manufacturing method of the present invention includes a resin film forming step in which the above-described positive photosensitive resin composition is applied onto a substrate and dried to form a resin film, and the resin film is exposed to a predetermined pattern. Through an exposure step, a development step of developing the exposed resin film with an aqueous alkaline solution to obtain a patterned resin film, and a heat treatment step of heating the pattern resin film to obtain a patterned cured film, A patterned cured film of benzoxazole can be obtained.
- a resin film forming step in which the above-described positive photosensitive resin composition is applied onto a substrate and dried to form a resin film, and the resin film is exposed to a predetermined pattern.
- a development step of developing the exposed resin film with an aqueous alkaline solution to obtain a
- the positive photosensitive resin composition of the present invention is rotated using a spinner or the like on a substrate such as a glass substrate, a semiconductor, a metal oxide insulator (for example, TiO 2 and SiO 2 ), or silicon nitride. After application, it is dried using a hot plate, oven or the like. Thereby, the resin film which is a coating film of positive type photosensitive resin composition is obtained.
- the thickness of the resin film is preferably 7 ⁇ m to 35 ⁇ m from the viewpoint of applicability. From the viewpoint of further enhancing the effect of the present invention, the thickness is preferably 15 ⁇ m to 35 ⁇ m, more preferably 20 ⁇ m to 35 ⁇ m.
- Exposure process Next, in the exposure step, exposure is performed by irradiating a predetermined pattern through a mask onto the resin film that has become a coating film on the substrate.
- the amount of exposure necessary for the positive photosensitive resin composition of the present invention is such that the film bottom when a resin film (coating film) having a thickness of 20 ⁇ m or more is subjected to i-line exposure in order to ensure good patternability. It is preferable to set such conversion rate is 70% or more diazonaphthoquinone compound, more preferably 2000 mJ / cm 2 or less, still more preferably 1500 mJ / cm 2 or less, 1000 mJ / cm 2 or less It is particularly preferred that
- the conversion rate of the diazonaphthoquinone compound at the bottom of the coating film is such that a coating film having a predetermined film thickness is formed on a glass plate, and the intensity of 405 nm, which is the absorption maximum of the diazonaphthoquinone compound, is 0 mJ / cm 2 in exposure amount.
- intensity conversion rate of 0% of the time to define the intensity when the exposure amount 3000 mJ / cm 2 100% conversion and, from a plot of intensity at the time of changing the exposure amount to 100 mJ / cm 2 increments, following It can be obtained by methods described in the literature.
- a pattern cured film is obtained by removing the exposed portion of the resin film exposed with i-line with a developer.
- the developer is preferably an aqueous alkali solution such as sodium hydroxide, potassium hydroxide, sodium silicate, ammonia, ethylamine, diethylamine, triethylamine, triethanolamine, tetramethylammonium hydroxide. Alcohols and surfactants may be added to the developer.
- the heating temperature in the heat treatment step is preferably 150 to 350 ° C, more preferably 150 to 300 ° C, and further preferably 200 to 300 ° C.
- FIG. 1 to 7 are schematic cross-sectional views for explaining a manufacturing process of a semiconductor device having a multilayer wiring structure, and show a series of processes from a first process to a seventh process.
- FIG. 8 is a schematic cross-sectional view of a semiconductor device having a UBM (Under Bump Metal) free structure.
- UBM Under Bump Metal
- a semiconductor substrate 1 such as a Si substrate having a circuit element (not shown) is covered with a protective film 2 such as a silicon oxide film except for a predetermined portion of the circuit element, and the first circuit element is exposed on the first circuit element.
- a conductor layer 3 is formed.
- a film of polyimide resin or the like as the interlayer insulating film 4 is formed on the semiconductor substrate by a spin coat method or the like (first step, FIG. 1).
- a photosensitive resin layer 5 such as chlorinated rubber or phenol novolac is formed on the interlayer insulating film 4 by a spin coating method, and a predetermined portion of the interlayer insulating film 4 is exposed by a known method using this as a mask.
- a window 6A is provided (second step, FIG. 2).
- the interlayer insulating film 4 exposed in the window 6A is selectively etched by dry etching means using a gas such as oxygen or carbon tetrafluoride to form the window 6B.
- the photosensitive resin layer 5 is completely removed using an etching solution that corrodes only the photosensitive resin layer 5 without corroding the first conductor layer 3 exposed from the window 6B (third step). FIG. 3).
- the second conductor layer 7 is formed using a known method, and electrical connection with the first conductor layer 3 is performed (fourth step, FIG. 4).
- the above steps are repeated to form each layer.
- the surface protective film 8 is formed as follows using the positive photosensitive resin composition of the present invention. That is, the resin composition of the present invention is applied and dried by a spin coating method, irradiated with light from a mask on which a pattern for forming a window 6C is formed at a predetermined portion, and then developed with an alkaline aqueous solution to form a patterned resin film. Form. Thereafter, the patterned resin film is heated to form a polybenzoxazole pattern cured film as the surface protective film 8 (fifth step, FIG. 5). This surface protective film (pattern cured film of polybenzoxazole) 8 has a function of protecting the conductor layer from external stress, ⁇ rays, and the like.
- a plating resist is formed in accordance with the window 6C using a known method, and the exposed metal thin film portion is plated by UBM.
- a metal layer 9 called (Under Bump Metal) is deposited. Then, the plating resist is peeled off, and the metal foil film other than the formation region of the UBM 9 is removed by etching to form a UBM (sixth step, FIG. 6). Further, external connection terminals 10 called bumps are formed on the surface of the metal layer 9 (seventh step, FIG. 7).
- the metal layer 9 is formed for the purpose of relaxing the stress acting on the bump 10 and improving the electrical connection reliability.
- UBM-free structure in which the bumps 10 are directly formed after the windows 6C are formed in the surface protective film 8.
- the second conductor layer 7 connected to the bump 10 needs to be formed thicker than usual in order to suppress an increase in electrical resistance due to the generation of intermetallic compounds. Further, it is necessary to relieve the stress acting on the bump 10 only by the surface protective film 8. For this reason, in order to cover the thick second conductor layer 7 and enhance the stress relaxation ability, it is necessary to form the surface protective film 8 thickly (FIG. 8).
- the thickness of the surface protective film (patterned cured film) is preferably 15 ⁇ m or more, more preferably 17 ⁇ m or more, further preferably 18 ⁇ m or more, and particularly preferably 20 ⁇ m or more.
- the upper limit value is not particularly limited, but is preferably 50 ⁇ m or less.
- This electronic component has a pattern cured film of the positive photosensitive resin composition described above.
- Examples of electronic components include semiconductor devices, multilayer wiring boards, and various electronic devices.
- the pattern cured film can be used as a surface protective film or an interlayer insulating film of an electronic component, an interlayer insulating film of a multilayer wiring board, or the like. Especially, it can use especially suitably as a surface protective film in a UBM free structure as mentioned above.
- Synthesis Example 2 The same operation as in Synthesis Example 1 was carried out except that dodecanedioic acid dichloride was changed to 5.86 g (32 mmol) of sebacic acid dichloride to obtain polymer 2.
- the weight average molecular weight of polymer 2 determined by GPC standard polystyrene conversion was 35,000, and the degree of dispersion was 2.0.
- Synthesis Example 3 The same operation as in Synthesis Example 1 was carried out except that dodecanedioic acid dichloride was replaced with cyclohexanedicarboxylic acid dichloride (7.94 g, 32 mmol) to obtain polymer 3.
- the weight average molecular weight of the polymer 3 determined by GPC standard polystyrene conversion was 38,000, and the degree of dispersion was 1.7.
- Synthesis Example 4 The same operation as in Synthesis Example 1 was carried out except that 11.80 g (40 mmol) of 4,4′-diphenyl ether dicarboxylic acid dichloride was used without using dodecanedioic acid dichloride, and Polymer 4 was obtained.
- the weight average molecular weight 20,000 calculated by GPC standard polystyrene conversion of the polymer 4 was 1.9.
- diphenyliodonium chloride was poured into an aqueous solution of 9,10-dimethoxyanthracenesulfonic acid sodium salt and stirred for 3 hours until the temperature returned to room temperature.
- the precipitate was collected, washed with pure water three times, and then dried under reduced pressure to obtain diphenyliodonium-9,10-dimethoxyanthracene-2-sulfonate (d1).
- diphenyliodonium chloride was poured into an aqueous solution of 8-anilino-1-naphthalenesulfonic acid ammonium and stirred for 3 hours until the temperature returned to room temperature.
- the precipitate was collected, washed with pure water three times, and then dried under reduced pressure to obtain diphenyliodonium-8-anilinonanaphthalene-1-sulfonate (d2).
- Examples 1 to 12 and Comparative Examples 1 to 8 The positive photosensitive resin compositions of Examples 1 to 12 and Comparative Examples 1 to 8 were prepared with the compositions shown in Tables 1 and 2. Content of Table 1 and Table 2 is a mass part of another component with respect to 100 mass parts of polymers. In addition, each component used is as follows.
- [Crosslinking agent] b1 “MX-270 (trade name)” having the following structure (manufactured by Sanwa Chemical Co., Ltd.)
- TPPA428 trade name having the following structure (manufactured by Daitokemix Co., Ltd.)
- DIANS Diphenyliodonium-8-anilinonanaphthalene-1-sulfonate
- the positive photosensitive resin composition was spin-coated on a silicon wafer and heat-dried at 120 ° C. for 3 minutes to obtain resin films (coating films) having film thicknesses shown in Tables 1 and 2.
- the exposure amount required to make the conversion rate of the diazonaphthoquinone compound at the bottom of the coating film 70% or more was determined.
- the conversion rate was determined according to the method described in the above literature. 1500 mJ / cm 2 or less in the case A, 1500J / cm 2 greater than 2,500 mJ / cm 2 or less in the case B, and greater than 2,500 mJ / cm 2 was C.
- the positive photosensitive resin composition was spin-coated on a silicon wafer and heat-dried at 120 ° C. for 3 minutes to obtain resin films (coating films) having film thicknesses shown in Tables 1 and 2. This was immersed in a 2.38 mass% aqueous solution of tetramethylammonium hydroxide (TMAH) for 80 seconds and rinsed with water, and then the film thickness change before and after immersion was measured using a stylus type film thickness meter. The value obtained by dividing the change in film thickness by the immersion time of 80 seconds was taken as the unexposed part dissolution rate.
- the case of 50 nm / second or less was designated as A, the case of faster than 50 nm / second and 100 nm / second or less as B, and the case of faster than 100 nm / second as C.
- the positive photosensitive resin composition was spin-coated on a silicon wafer and heat-dried at 120 ° C. for 3 minutes to obtain resin films (coating films) having film thicknesses shown in Tables 1 and 2.
- Proximity exposure equipment USH with an exposure amount corresponding to the sensitivity estimated in advance (exposure amount necessary to make the conversion rate of the diazonaphthoquinone compound at the bottom of the coating film 70% or more) was obtained.
- the product was exposed through an i-line filter using a trade name “UX-1000SM-XJ01” manufactured by Denki Co., Ltd.
- TMAH tetramethylammonium hydroxide
- Dissolution contrast A value obtained by dividing the exposed portion dissolution rate by the unexposed portion dissolution rate was taken as the dissolution contrast.
- a positive photosensitive resin composition was spin-coated on a silicon wafer and heat-treated at a drying temperature of 120 ° C. for 3 minutes to form resin films (coating films) having the film thicknesses shown in Tables 1 and 2.
- Proximity exposure equipment USH
- the product was exposed through an i-line filter using a trade name “UX-1000SM-XJ01” manufactured by Denki Co., Ltd.
- TMAH tetramethylammonium hydroxide
- a having a minimum pattern size that can be opened is 30 ⁇ m or less, A being greater than 30 ⁇ m and not more than 50 ⁇ m, and C being greater than 50 ⁇ m.
- the positive photosensitive resin composition of the present invention exhibits good sensitivity even with a thick film of 20 ⁇ m or more, and can realize a high dissolution contrast and a remaining film ratio. Patterning properties.
- the film thickness of each of the patterned cured films obtained by heating the patterned resin films prepared in Examples 1 to 12 for evaluation for 1 hour at 200 ° C. was 15 ⁇ m or more.
- the photosensitive resin composition of the present invention can be used for electronic parts such as semiconductor devices, multilayer wiring boards, and various electronic devices.
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Abstract
Description
また、ポリベンゾオキサゾールは、その前駆体と、ジアゾナフトキノン化合物(ナフトキノンジアジド化合物)とを組み合わせたポジ型感光性樹脂組成物を基板上に塗布、乾燥した後、露光、現像工程を経て加熱硬化することによって、ポリベンゾオキサゾールを含むパターン硬化膜を容易に得ることができる。これにより、例えば、半導体素子回路の接続端子部分のみが開口したパターン硬化膜を得ることができる(特許文献3、4)。なお、開口したパターン部には、はんだや銅で構成されるバンプと呼ばれる外部接続端子が形成される。
一方、露光によって、ジアゾナフトキノン化合物がインデンカルボン酸に変換され、相互作用が消失することから、ポリベンゾオキサゾール前駆体のアルカリ水溶液への溶解性が向上する。
従って、アルカリ水溶液に対する露光部の溶解速度が未露光部の溶解速度よりも速くなるため(溶解コントラスト(未露光部の溶解速度に対する露光部の溶解速度の比率)が大きくなるため)、パターン形成が可能となる。
未露光部においても、徐々に現像液への溶解が進行してしまい、残膜率(初期膜厚に対する現像後の膜厚の比率)が低くなってしまったり、パターンはがれが発生したりする場合があった。そこで、残膜率の低下を抑制することを目的にジアゾナフトキノン化合物以外の溶解阻害剤を添加すると、露光部においても該溶解阻害剤による溶解阻害効果が消失せず、さらに現像時間が長くなる場合があった。
1.下記成分(a)~(e)を含むポジ型感光性樹脂組成物。
(a)下記一般式(1)で表される構造単位を含むポリベンゾオキサゾール前駆体
(b)架橋剤
(c)ジアゾナフトキノン化合物
(d)下記一般式(2)又は(3)で表されるヨードニウム化合物
(e)溶剤
2.前記(a)成分が、下記一般式(4)で表される構造を有するポリベンゾオキサゾール前駆体である1に記載のポジ型感光性樹脂組成物。
Uは2価の有機基であり、
Vは脂肪族鎖状構造又は脂環式構造を含む2価の有機基であり、
Wは2価の有機基であり、
Xは脂肪族鎖状構造及び脂環式構造を含まない2価の有機基である。
j及びkは構造単位A及びBのモル重合比を表し、jは1以上の値であり、かつj+k=100である。)
3.さらに、下記(a’)成分を含む1又は2に記載のポジ型感光性樹脂組成物。
(a’)下記一般式(5)で表される構造単位を有し、上記一般式(1)で表される構造単位を有さないポリベンゾオキサゾール前駆体
4.UBMフリーの構造を有する半導体装置の表面保護膜用である1~3のいずれかに記載のポジ型感光性樹脂組成物。
5.1~4のいずれかに記載のポジ型感光性樹脂組成物を基板上に塗布、乾燥して樹脂膜を形成する樹脂膜形成工程と、
前記樹脂膜を所定のパターンに露光する露光工程と、
露光後の前記樹脂膜をアルカリ水溶液を用いて現像してパターン樹脂膜を形成する現像工程と、
前記パターン樹脂膜を加熱処理してパターン硬化膜を得る加熱処理工程とを含むパターン硬化膜の製造方法。
6.前記樹脂膜の厚みが20μm以上であり、
前記パターン硬化膜の厚みが15μm以上である5に記載のパターン硬化膜の製造方法。
7.1~4のいずれかに記載のポジ型感光性樹脂組成物のパターン硬化膜。
8.7に記載のパターン硬化膜を含む電子部品。
具体的には、本発明のポジ型感光性樹脂組成物では、特定の構造を導入することによって露光波長(365nm)に対する高い透過率を示すポリベンゾオキサゾール前駆体を用いて、厚膜底部におけるジアゾナフトキノン化合物の露光を十分行うことができるようにするとともに、特定の構造を有するヨードニウム化合物を組み合わせることによって、未露光部の溶解速度を抑制し、かつ露光部の溶解速度を促進可能であり、厚膜のパターン硬化膜を形成する場合でも、作業性(実用可能な現像時間内で現像可能)に優れ、高い残膜率を維持したまま、良好なパターン形成が可能となる。
「~」を用いて示された数値範囲は、「~」の前後に記載される数値をそれぞれ最小値及び最大値として含む範囲を示す。また、本明細書において組成物中の各成分の含有量は、組成物中に各成分に該当する物質が複数存在する場合、特に断らない限り、組成物中に存在する当該複数の物質の合計量を意味する。さらに、例示材料は特に断らない限り単独で用いてもよいし、2種以上を組み合わせて用いてもよい。
(a)下記一般式(1)で表される構造単位を含むポリベンゾオキサゾール前駆体
(b)架橋剤
(c)ジアゾナフトキノン化合物
(d)下記一般式(2)又は(3)で表されるヨードニウム化合物
(e)溶剤
本発明において、(a)成分であるポリベンゾオキサゾール前駆体は、下記一般式(1)で表される構造単位を一部含んでいれば特に制限はない。
Wは2価の有機基であり、Xは脂肪族鎖状構造及び脂環式構造を含まない2価の有機基である。Wについては一般式(1)のUと同じである。
jとkの値は、j=1~99、k=1~99の値で任意に設定できるが、アルカリ水溶液への溶解性、硬化膜の機械特性や耐熱性、耐薬品性の観点から、j=5~90、k=10~95であることが好ましく、j=10~85、k=15~90であることがより好ましい。
また、脂肪族鎖状構造が存在した場合、ポリベンゾオキサゾール前駆体の脱水閉環反応が低温で進行しやすくなり、硬化性に優れることからより好ましい。さらに、Vが炭素数7~30の脂肪族直鎖構造であると、硬化膜の破断伸びが向上するため、機械特性の観点から好ましい。
前記の中でも、200℃以下の低温で硬化しても薬液耐性が高い硬化膜が得られる観点からは、一般式(8)で表される化合物が特に好ましい。
ジアゾナフトキノン化合物は、例えば、o-キノンジアジドスルホニルクロリド類とヒドロキシ化合物、アミノ化合物等とを脱塩酸剤の存在下で縮合反応させることで得られる。前記o-キノンジアジドスルホニルクロリド類としては、ベンゾキノン-1,2-ジアジド-4-スルホニルクロリド、ナフトキノン-1,2-ジアジド-5-スルホニルクロリド、ナフトキノン-1,2-ジアジド-4-スルホニルクロリド等を用いることができる。
一般式(2)又は(3)で表されるヨードニウム化合物は、i線を吸収し、露光によって分解して溶解阻害効果を消失することができる。
R13はアルキル基(好ましくは炭素数1~10、より好ましくは炭素数1~6)である。なお、2個のR1~R5及びR13はそれぞれ同一でも異なってもよい。
本発明のパターン硬化膜は、本発明のポジ型感光性樹脂組成物のパターン硬化膜である。
本発明によるパターン硬化膜の製造方法について説明する。本発明のパターン硬化膜の製造方法は、上述したポジ型感光性樹脂組成物を基板上に塗布し乾燥して樹脂膜を形成する樹脂膜形成工程と、前記樹脂膜を所定のパターンに露光する露光工程と、露光後の前記樹脂膜をアルカリ水溶液を用いて現像してパターン樹脂膜を得る現像工程と、前記パターン樹脂膜を加熱処理してパターン硬化膜を得る加熱処理工程とを経て、ポリベンゾオキサゾールのパターン硬化膜を得ることができる。以下、各工程の実施形態について説明する。
まず、本工程では、ガラス基板、半導体、金属酸化物絶縁体(例えばTiO2及びSiO2)、窒化ケイ素等の基板上に、本発明のポジ型感光性樹脂組成物をスピンナー等を用いて回転塗布後、ホットプレート、オーブン等を用いて乾燥する。これにより、ポジ型感光性樹脂組成物の塗膜である樹脂膜が得られる。この樹脂膜の厚さは、塗布性の観点から、7μm~35μmであることが好ましい。また、本発明の効果をより高める観点からは、15μm~35μmであることが好ましく、20μm~35μmであることがより好ましい。
次に、露光工程では、基板上で塗膜となった樹脂膜に、マスクを介して所定のパターンにi線を照射することにより露光を行う。
F.H.Dill他3名:Characterization of PositivePhotoresist,IEEE Trans.Electron Devices,vol.ED-22,No.7,pp445-452,1975
現像工程では、i線で露光した樹脂膜の露光部を現像液で除去することによりパターン硬化膜が得られる。現像液としては、水酸化ナトリウム、水酸化カリウム、ケイ酸ナトリウム、アンモニア、エチルアミン、ジエチルアミン、トリエチルアミン、トリエタノールアミン、テトラメチルアンモニウムヒドロキシド等のアルカリ水溶液が好ましい。前記現像液にアルコール類や界面活性剤を添加して用いることもできる。
次いで、加熱処理工程では、現像後得られたパターンを加熱処理することにより、脱水閉環が進行してポリベンゾオキサゾールを含むパターン硬化膜を形成することができる。加熱処理工程における加熱温度は、150~350℃が好ましく、150~300℃がより好ましく、200~300℃がさらに好ましい。
次に、本発明によるパターンの製造方法の一例として、半導体装置の製造工程を図面に基づいて説明する。図1~図7は、多層配線構造を有する半導体装置の製造工程を説明する概略断面図であり、第1の工程から第7の工程へと一連の工程を表している。図8はUBM(Under Bump Metal)フリーの構造を有する半導体装置の概略断面図である。
前記半導体基板上にスピンコート法等で層間絶縁膜4としてのポリイミド樹脂等の膜が形成される(第1の工程、図1)。
上限値は特に制限はないが、50μm以下であることが好ましい。
次に、本発明の電子部品について説明する。この電子部品は、上述したポジ型感光性樹脂組成物のパターン硬化膜を有する。電子部品として、半導体装置や多層配線板、各種電子デバイス等が挙げられる。
<合成例1>
攪拌機、温度計を備えた0.2リットルのフラスコ中に、N-メチルピロリドン60gを仕込み、2,2’-ビス(3-アミノ-4-ヒドロキシフェニル)ヘキサフルオロプロパン14.65g(40mmol)を添加し、攪拌溶解した。続いて、温度を0~5℃に保ちながら、ドデカン二酸ジクロリド8.55g(32mmol)と4,4’-ジフェニルエーテルジカルボン酸ジクロリド2.36g(8mmol)をそれぞれ10分間ずつかけて加えた後、室温に戻し3時間攪拌を続けた。溶液を3リットルの水に投入し、析出物を回収し、これを純水で3回洗浄した後、減圧してポリヒドロキシアミド(ポリベンゾオキサゾール前駆体)を得た(以下、ポリマー1とする)。ポリマー1のGPC法標準ポリスチレン換算により求めた重量平均分子量は39,500、分散度は1.9であった。
測定装置:検出器 株式会社日立製作所社製「L4000UV」
ポンプ:株式会社日立製作所社製「L6000」
株式会社島津製作所社製「C-R4A Chromatopac」
測定条件:カラム 「Gelpack GL-S300MDT-5」×2本
溶離液:THF/DMF=1/1 (容積比)
LiBr(0.03mol/l)、H3PO4(0.06mol/l)
流速:1.0ml/min、検出器:UV270nm
なお、ポリマー0.5mgに対して溶媒[THF/DMF=1/1(容積比)]1mlの溶液を用いて測定した。
合成例1において、ドデカン二酸ジクロリドをセバシン酸ジクロリド5.86g(32mmol)に代えた以外はすべて同様に操作を行い、ポリマー2を得た。ポリマー2のGPC法標準ポリスチレン換算により求めた重量平均分子量は35,000、分散度は2.0であった。
合成例1において、ドデカン二酸ジクロリドをシクロヘキサンジカルボン酸ジクロリド7.94g(32mmol)に代えた以外はすべて同様に操作を行い、ポリマー3を得た。ポリマー3のGPC法標準ポリスチレン換算により求めた重量平均分子量は38,000、分散度は1.7であった。
合成例1において、ドデカン二酸ジクロリドを用いずに、4,4’-ジフェニルエーテルジカルボン酸ジクロリド11.80g(40mmol)のみを用いた以外はすべて同様に操作を行い、ポリマー4を得た。ポリマー4のGPC法標準ポリスチレン換算により求めた重量平均分子量20,000は、分散度は1.9であった。
<合成例5>
攪拌機、温度計を備えた0.5リットルのフラスコ中に、イオン交換水150mLを仕込み、ジフェニルヨードニウムクロリド4.3g(14mmol)を添加し、100℃で加熱しながら撹拌溶解した。また、別途、攪拌機、温度計を備えた1.0リットルのフラスコ中に、イオン交換水300mLを仕込み、9,10-ジメトキシアントラセンスルホン酸ナトリウム4.7g(14mmol)を添加し、100℃で加熱しながら撹拌溶解した。続いて、ジフェニルヨードニウムクロリド水溶液を9,10-ジメトキシアントラセンスルホン酸ナトリウム水溶液に注ぎ、室温に戻るまで3時間撹拌した。析出物を回収し、これを純水で3回洗浄した後、減圧して乾燥することで、ジフェニルヨードニウム-9,10-ジメトキシアントラセン-2-スルホナート(d1)を得た。
攪拌機、温度計を備えた0.5リットルのフラスコ中に、イオン交換水300mLを仕込み、ジフェニルヨードニウムクロリド10.0g(32mmol)を添加し、100℃で加熱しながら撹拌溶解した。また、別途、攪拌機、温度計を備えた1.0リットルのフラスコ中に、イオン交換水300mLを仕込み、8-アニリノ-1-ナフタレンスルホン酸アンモニウム10.0g(32mmol)を添加し、100℃で加熱しながら撹拌溶解した。続いて、ジフェニルヨードニウムクロリド水溶液を8-アニリノ-1-ナフタレンスルホン酸アンモニウム水溶液に注ぎ、室温に戻るまで3時間撹拌した。析出物を回収し、これを純水で3回洗浄した後、減圧して乾燥することで、ジフェニルヨードニウム-8-アニリノナフタレン-1-スルホナート(d2)を得た。
実施例1~12及び比較例1~8のポジ型感光性樹脂組成物を表1及び表2に示す組成で調製した。表1及び表2の含有量は、ポリマー100質量部に対する、他の成分の質量部である。
尚、用いた各成分は以下の通りである。
a1:合成例1で合成したポリマー1
a2:合成例2で合成したポリマー2
a3:合成例3で合成したポリマー3
a4:合成例4で合成したポリマー4
e1:γ-ブチロラクトン(BLO)
ポジ型感光性樹脂組成物をシリコンウエハ上にスピンコートして、120℃で3分間加熱乾燥して、表1及び表2に示す膜厚の樹脂膜(塗膜)を得た。塗膜底部のジアゾナフトキノン化合物の変換率を70%以上にするために必要な露光量を求めた。変換率は、前記の文献に記載の方法に従って求めた。1500mJ/cm2以下の場合をA、1500J/cm2より大きく2500mJ/cm2以下の場合をB、2500mJ/cm2より大きい場合をCとした。
ポジ型感光性樹脂組成物をシリコンウエハ上にスピンコートして、120℃で3分間加熱乾燥して、表1及び表2に示す膜厚の樹脂膜(塗膜)を得た。これを、テトラメチルアンモニウムヒドロキシド(TMAH)の2.38質量%水溶液に80秒間浸漬し、水でリンスした後、浸漬前後の膜厚変化を触針式膜厚計を用いて測定した。膜厚変化を浸漬時間80秒で除した値を未露光部溶解速度とした。50nm/秒以下の場合をA、50nm/秒より速く100nm/秒以下の場合をB、100nm/秒より速い場合をCとした。
ポジ型感光性樹脂組成物をシリコンウエハ上にスピンコートして、120℃で3分間加熱乾燥して、表1及び表2に示す膜厚の樹脂膜(塗膜)を得た。得られた塗膜に、あらかじめ見積もっておいた感度に相当する露光量(塗膜底部のジアゾナフトキノン化合物の変換率を70%以上にするために必要な露光量)で、プロキシミティ露光装置(ウシオ電機株式会社製、商品名「UX-1000SM-XJ01」)を用いて、i線フィルターを通して露光した。露光後、テトラメチルアンモニウムヒドロキシド(TMAH)の2.38質量%水溶液に浸漬して、シリコンウエハが露出するまでの時間を計測した。浸漬前の膜厚をシリコンウエハが露出するまでの時間で除した値を露光部溶解速度とした。露光部溶解速度が200nm/秒以上の場合をA、100以上200nm/秒より遅い場合をB、100nm/秒より遅い場合をCとした。
露光部溶解速度を未露光部溶解速度で除した値を溶解コントラストとした。溶解コントラストが7以上をA、3以上7より小さい場合をB、3より小さい場合をCとした。
ポジ型感光性樹脂組成物をシリコンウエハ上にスピンコートして、乾燥温度120℃で3分間加熱処理を行い、表1及び表2に示す膜厚の樹脂膜(塗膜)を形成した。得られた塗膜に、あらかじめ見積もっておいた感度に相当する露光量(塗膜底部のジアゾナフトキノン化合物の変換率を70%以上にするために必要な露光量)で、プロキシミティ露光装置(ウシオ電機株式会社製、商品名「UX-1000SM-XJ01」)を用いて、i線フィルターを通して露光した。露光後、テトラメチルアンモニウムヒドロキシド(TMAH)の2.38質量%水溶液にて、パドル現像を行い、パターン樹脂膜を作製した。現像時間は、先に測定した露光部のシリコンウエハが完全に露出するまでの時間の1.5倍の時間とした。現像時間が200秒以下の場合をA、200秒より長く300秒以下の場合をB、300秒より長い場合をCとした。
現像性の評価で作製したパターン樹脂膜について、現像後の膜厚を現像前の膜厚で除した値を残膜率とした。残膜率が75%以上をA、60%以上75%未満の場合をB、60%未満の場合をCとした。
さらに、現像性の評価で作製したパターン樹脂膜について、開口可能な最小パターン寸法が30μm以下のものをA、30μmより大きく50μm以下のものをB、50μmより大きいものをCとした。
また、現像性の評価で作製したパターン樹脂膜について、パターンはがれが発生していないものAを、発生したものをBとした。
また、実施例1~12の現像性の評価で作製したパターン樹脂膜を200℃、1時間加熱して得られたパターン硬化膜の膜厚は、いずれも15μm以上であった。
この明細書に記載の文献及び本願のパリ優先の基礎となる日本出願明細書の内容を全てここに援用する。
Claims (8)
- 下記成分(a)~(e)を含むポジ型感光性樹脂組成物。
(a)下記一般式(1)で表される構造単位を含むポリベンゾオキサゾール前駆体
(b)架橋剤
(c)ジアゾナフトキノン化合物
(d)下記一般式(2)又は(3)で表されるヨードニウム化合物
(e)溶剤 - アンダーバンプメタルフリーの構造を有する半導体装置の表面保護膜用である請求項1~3のいずれかに記載のポジ型感光性樹脂組成物。
- 請求項1~4のいずれかに記載のポジ型感光性樹脂組成物を基板上に塗布し乾燥して樹脂膜を形成する樹脂膜形成工程と、
前記樹脂膜を所定のパターンに露光する露光工程と、
露光後の前記樹脂膜をアルカリ水溶液を用いて現像してパターン樹脂膜を得る現像工程と、
前記パターン樹脂膜を加熱処理してパターン硬化膜を得る加熱処理工程とを含むパターン硬化膜の製造方法。 - 前記樹脂膜の厚みが20μm以上であり、
前記パターン硬化膜の厚みが15μm以上である請求項5に記載のパターン硬化膜の製造方法。 - 請求項1~4のいずれかに記載のポジ型感光性樹脂組成物のパターン硬化膜。
- 請求項7に記載のパターン硬化膜を含む電子部品。
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- 2016-01-22 KR KR1020177023097A patent/KR102647706B1/ko active IP Right Grant
- 2016-01-22 TW TW105101986A patent/TWI735422B/zh active
- 2016-01-22 CN CN201680017372.2A patent/CN107430334B/zh active Active
- 2016-01-22 JP JP2016570553A patent/JP6658548B2/ja active Active
- 2016-01-22 SG SG11201705933WA patent/SG11201705933WA/en unknown
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2017
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SG11201705933WA (en) | 2017-09-28 |
TWI735422B (zh) | 2021-08-11 |
US11048167B2 (en) | 2021-06-29 |
PH12017501319B1 (en) | 2018-02-05 |
CN107430334B (zh) | 2021-07-30 |
TW201627769A (zh) | 2016-08-01 |
JP6658548B2 (ja) | 2020-03-04 |
PH12017501319A1 (en) | 2018-02-05 |
JPWO2016117347A1 (ja) | 2017-11-02 |
KR20170128240A (ko) | 2017-11-22 |
US20180074403A1 (en) | 2018-03-15 |
CN107430334A (zh) | 2017-12-01 |
KR102647706B1 (ko) | 2024-03-15 |
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