WO2017134700A1 - ポジ型感光性樹脂組成物 - Google Patents
ポジ型感光性樹脂組成物 Download PDFInfo
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- WO2017134700A1 WO2017134700A1 PCT/JP2016/000617 JP2016000617W WO2017134700A1 WO 2017134700 A1 WO2017134700 A1 WO 2017134700A1 JP 2016000617 W JP2016000617 W JP 2016000617W WO 2017134700 A1 WO2017134700 A1 WO 2017134700A1
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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
- G03F7/0045—Photosensitive materials with organic non-macromolecular light-sensitive compounds not otherwise provided for, e.g. dissolution inhibitors
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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
- G03F7/022—Quinonediazides
- G03F7/0226—Quinonediazides characterised by the non-macromolecular additives
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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
- G03F7/022—Quinonediazides
- G03F7/023—Macromolecular quinonediazides; Macromolecular additives, e.g. binders
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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
- G03F7/022—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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—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
- G03F7/004—Photosensitive materials
- G03F7/0048—Photosensitive materials characterised by the solvents or agents facilitating spreading, e.g. tensio-active agents
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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
Definitions
- the present invention relates to a positive photosensitive resin composition, a method for producing a cured pattern film using the same, a cured film obtained from the positive photosensitive resin composition, an interlayer insulating film using the cured film, a cover coat layer, or The present invention relates to a surface protective film and an electronic component having the same.
- polyimide having excellent heat resistance, electrical characteristics, mechanical characteristics, and the like has been used for the surface protective film and the interlayer insulating film of the semiconductor element.
- a photosensitive polyimide having a photosensitive property imparted to the polyimide itself has been used, and if this is used, the manufacturing process of the pattern cured film can be simplified and the complicated manufacturing process can be shortened.
- multi-die fanout wafer level packaging (Multi-die Fanout Wafer Level Packaging) is a package that is manufactured by encapsulating multiple dies in one package and has been proposed in the past.
- the fan-out wafer level package, in which one die is encapsulated in one package, is attracting much attention because it can be expected to reduce costs and improve performance.
- An object of the present invention is to provide a positive photosensitive resin composition having excellent adhesion to various substrates such as a Si substrate even when cured at a low temperature of 200 ° C. or lower. Further, a method for producing a cured pattern film using the positive photosensitive resin composition, a cured film obtained from the positive photosensitive resin composition, an interlayer insulating film, a cover coat layer, or a surface protective film using the cured film And an electronic component having the same.
- the inventors of the present invention evaluated adhesiveness by curing a photosensitive resin composition using crosslinking agents having different numbers of functional groups at 200 ° C.
- the photosensitive resin composition in which a cross-linking agent that has been widely used in the past is combined with a polybenzoxazole precursor has low reactivity with the polybenzoxazole precursor, and can be applied to a Si substrate after being cured at 200 ° C. It was found that the adhesion was low. Furthermore, it was found that the crosslinking agent having low reactivity remains in the film in an unreacted state after curing, and decreases the adhesiveness after the pressure cooker test (PCT test).
- the present inventors have cured a resin composition at a low temperature of 200 ° C. or lower by combining a highly reactive crosslinking agent with a polybenzoxazole precursor. Even so, it has been found that it exhibits excellent adhesion to various substrates.
- the following positive photosensitive resin composition and the like are provided. 1.
- each R 1 is independently a hydrogen atom or a group represented by —CH 2 —O—R 2. At least one of the plurality of R 1 is —CH 2 —O—R. And each R 2 independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.) 2.
- the positive photosensitive resin composition according to 1, comprising 5 parts by mass or more of the component (b) with respect to 100 parts by mass of the component (a). 3.
- the present invention it is possible to provide a positive photosensitive resin composition having excellent adhesion to various substrates such as a Si substrate even when cured at a low temperature of 200 ° C. or lower.
- the positive photosensitive resin composition of the present invention a method for producing a patterned cured film using the same, a cured film obtained from the positive photosensitive resin composition, an interlayer insulating film using the patterned cured film, a cover
- An embodiment of a coat layer or a surface protective film and an electronic component having the same will be described in detail.
- the present invention is not limited to the following embodiments.
- a or B only needs to include either A or B, and may include both.
- the material illustrated below may be used individually by 1 type, and may be used in combination of 2 or more type.
- the content of 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 term “process” is not limited to an independent process, and is included in the term if the intended action of the process is achieved even when it cannot be clearly distinguished from other processes. .
- 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.
- the positive photosensitive resin composition of the present invention contains (a) a polybenzoxazole precursor, (b) a crosslinking agent, (c) a photosensitive agent, and (d) a solvent.
- these components may be simply referred to as (a) component, (b) component, (c) component, and (d) component.
- each component will be described.
- the component (a) component includes a structural unit represented by the following formula (1).
- U is a divalent organic group, single bond, —O— or —SO 2 —
- V is a group containing an aliphatic structure, and the aliphatic structure has 1 to 30 carbon atoms. It is. With such a structure, the transmittance of i-line, which is a light source used during patterning, is increased.
- the divalent organic group of U is preferably a group containing an aliphatic structure having 1 to 30 carbon atoms, and more preferably a group containing an aliphatic chain structure having 2 to 30 carbon atoms.
- the divalent organic group of U is preferably a group including a structure represented by the following formula (UV1).
- R 1 and R 2 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 1 to 30 It is an integer.
- R 1 and R 2 include a methyl group and a trifluoromethyl group, and a trifluoromethyl group is preferable from the viewpoint of transparency of the polybenzoxazole precursor.
- a is preferably an integer of 1 to 5.
- Examples of the group containing an aliphatic structure of V include structures derived from dicarboxylic acids.
- Examples of the raw material dicarboxylic acid include dodecanedioic acid, decanedioic acid, 2,2-bis (4-carboxyphenyl) -1,1,1,3,3,3-hexafluoropropane, 2,2-bis ( p-carboxyphenyl) propane, 5-tert-butylisophthalic acid and the like, and examples of V include groups obtained by removing two carboxy groups from these.
- the polybenzoxazole precursor of component (a) may have a structural unit other than the structural unit represented by the formula (1) in part.
- the proportion of the structural unit represented by the formula (1) is preferably 50 mol% or more, more preferably 60 mol% or more in all the structural units.
- structural units other than the structural unit represented by formula (1) include those in which V is a skeleton derived from a diphenyl ether compound.
- the polybenzoxazole precursor is usually developed with an aqueous alkaline solution, it is preferably soluble in the aqueous alkaline solution.
- the alkaline aqueous solution include an organic ammonium aqueous solution such as a tetramethylammonium hydroxide (TMAH) aqueous solution, a metal hydroxide aqueous solution, and an organic amine aqueous solution.
- TMAH tetramethylammonium hydroxide
- the component (a) is preferably soluble in the TMAH aqueous solution.
- the molecular weight of the polybenzoxazole precursor as the component (a) is preferably 10,000 to 100,000, more preferably 15,000 to 100,000, in terms of polystyrene. More preferably, it is from 5,000 to 85,000. If the weight average molecular weight is less than 10,000, the solubility in an alkali developer may be too high. If the weight average molecular weight is more than 100,000, the solubility in a solvent may be reduced, or the viscosity of the solution may increase. There is a risk that the handleability may deteriorate.
- the weight average molecular weight can be measured by gel permeation chromatography and can be determined by conversion using a standard polystyrene calibration curve. Further, the dispersity obtained by dividing the weight average molecular weight by the number average molecular weight is preferably 1 to 4, and more preferably 1 to 3.
- each R 1 is independently a hydrogen atom or a group represented by —CH 2 —O—R 2 . At least one of the plurality of R 1 is a group represented by —CH 2 —O—R 2 .
- Each R 2 is independently a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
- the component (b) crosslinking agent reacts with the polybenzoxazole precursor even at a relatively low temperature in the step of heat-treating the pattern resin film after applying, exposing and developing the positive photosensitive resin composition. (Crosslinking reaction) or the crosslinking agent itself polymerizes. Thereby, even if it is a case where a resin composition is hardened
- R 1 to a part may be a -CH 2 -O-R 2, all may be -CH 2 -O-R 2.
- all R 1 are —CH 2 —O—R 2 .
- the alkyl group having 1 to 6 carbon atoms of R 2 include a methyl group, an ethyl group, and a butyl group.
- the blending amount of the component (b) is preferably 1 part by mass or more, more preferably 1 to 40 parts by mass, and further preferably 10 to 30 parts by mass with respect to 100 parts by mass of the component (a).
- the positive photosensitive resin composition of the present invention contains a photosensitizer as the component (c) together with the polybenzoxazole precursor which is the component (a).
- the photosensitive agent is a compound that generates an acid upon irradiation with actinic rays, and has a function of increasing the solubility of the irradiated portion in an alkaline aqueous solution.
- Examples of the photosensitizer include diazonaphthoquinone compounds, aryldiazonium salts, diaryliodonium salts, triarylsulfonium salts and the like. Among them, diazonaphthoquinone compounds are preferable because of their high sensitivity.
- a diazonaphthoquinone compound is a compound having a diazonaphthoquinone structure.
- the diazonaphthoquinone compound can be obtained, for example, by subjecting o-quinonediazidosulfonyl chlorides to a hydroxy compound, an amino compound or the like in the presence of a dehydrochlorinating agent.
- Examples of o-quinonediazide sulfonyl chlorides include 1,2-benzoquinone-2-diazide-4-sulfonyl chloride, 1,2-naphthoquinone-2-diazide-5-sulfonyl chloride, and 1,2-naphthoquinone-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, tris (4-hydroxyphenyl) ethane and the like can be used.
- amino compounds include p-phenylenediamine, m-phenylenediamine, 4,4′-diaminodiphenyl ether, 4,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylsulfone, and 4,4′-diaminodiphenyl sulfide.
- the amount of component (c) is preferably 0.01 to 50 parts by mass with respect to 100 parts by mass of component (a) in order to improve the sensitivity and resolution during exposure.
- the amount is more preferably 1 to 20 parts by mass, and further preferably 0.5 to 20 parts by mass.
- component (d) component: solvent As component (d), ⁇ -butyrolactone, ethyl lactate, propylene glycol monomethyl ether acetate, benzyl acetate, n-butyl acetate, ethoxyethyl propionate, 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 and the like can be mentioned.
- the content of the component (d) is not particularly limited, but is preferably 50 to 400 parts by weight, more preferably 100 to 300 parts by weight, and still more preferably 150 to 250 parts by weight with respect to 100 parts by weight of the component (a).
- the positive photosensitive resin composition of the present invention may contain a known coupling agent other than the component (c), a dissolution accelerator, a dissolution inhibitor, a surfactant, a leveling agent, and the like, if necessary. .
- the positive photosensitive resin composition of the present invention may consist essentially of components (a), (b), (c) and (d) (consisting essentially of).
- 80% by mass or more and 100% by mass or less (preferably 90% by mass or more and 100% by mass or less) of the positive photosensitive resin composition of the present invention may be the above component, or 95% by mass of the composition.
- % To 100% by mass and 98% by mass to 100% by mass may be the above components.
- the positive photosensitive resin composition of the present invention may consist only of the components (a), (b), (c) and (d) (consisting of). In this case, inevitable impurities may be included.
- the method for producing a cured pattern film of the present invention includes a step of applying the above-described positive photosensitive resin composition onto a substrate and drying to form a photosensitive resin film, and exposing the photosensitive resin film to a predetermined pattern.
- the process includes a step of developing the exposed resin film using an alkaline aqueous solution to form a pattern resin film, and a step of heat-treating the pattern resin film.
- each step will be described.
- a positive photosensitive resin composition is applied onto a substrate and dried to form a photosensitive resin film.
- the substrate include glass, semiconductors, metal oxide insulators such as TiO 2 and SiO 2 , silicon nitride, copper, and copper alloys.
- Drying can be performed using a hot plate, an oven, or the like.
- the heating temperature is preferably 100 to 150 ° C.
- the heating time is preferably 30 seconds to 5 minutes. Thereby, the photosensitive resin film which formed the positive photosensitive resin composition in the film form can be obtained.
- the film thickness of the photosensitive resin film is preferably 5 to 100 ⁇ m, more preferably 8 to 50 ⁇ m, and even more preferably 10 to 30 ⁇ m.
- the photosensitive resin film is exposed to a predetermined pattern through a mask.
- the actinic rays to be irradiated include ultraviolet rays including i rays, visible rays, and radiation, and i rays are preferable.
- a parallel exposure machine, a projection exposure machine, a stepper, a scanner exposure machine, or the like can be used as the exposure apparatus.
- a patterned resin film By developing the resin film that has undergone the exposure process, a patterned resin film (pattern resin film) can be obtained.
- a positive photosensitive resin composition is used, the exposed portion is removed with a developer.
- An aqueous alkali solution can be used as the developer, and examples of the aqueous alkali solution include sodium hydroxide, potassium hydroxide, sodium silicate, ammonia, ethylamine, diethylamine, triethylamine, triethanolamine, tetramethylammonium hydroxide, and the like. Tetramethylammonium hydroxide is preferred.
- the concentration of the aqueous alkaline solution is preferably 0.1 to 10% by mass.
- the development time varies depending on the type of polybenzoxazole precursor to be used, but is preferably 10 seconds to 15 minutes, more preferably 10 seconds to 5 minutes, and further preferably 30 seconds to 4 minutes from the viewpoint of productivity.
- Alcohols or surfactants may be added to the developer.
- the addition amount is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the developer.
- the heating temperature is preferably 250 ° C. or lower, more preferably 120 to 250 ° C., and further preferably 160 to 230 ° C. By being within this range, damage to the substrate and the device can be suppressed, the device can be produced with a high yield, and energy saving of the process can be realized. If the positive photosensitive resin composition of this invention is used, the cured film which is excellent in adhesiveness with respect to a various board
- the heating time is preferably 5 hours or less, more preferably 30 minutes to 3 hours. By being within this range, the crosslinking reaction or dehydration ring-closing reaction can sufficiently proceed.
- the atmosphere for the heat treatment may be in the air or in an inert atmosphere such as nitrogen. From the viewpoint of preventing the pattern resin film from being oxidized, a nitrogen atmosphere is preferable.
- Examples of the apparatus used in the heat treatment step include a quartz tube furnace, a hot plate, rapid thermal annealing, a vertical diffusion furnace, an infrared curing furnace, an electron beam curing furnace, and a microwave curing furnace.
- FIG. 1 to 7 are schematic cross-sectional views for explaining a manufacturing process of a fan-out package having a multilayer wiring structure, and represent a series of processes from the first process to the seventh process.
- FIG. 8 is a schematic cross-sectional view of a fan-out package 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 is formed thereon as the interlayer insulating film 4 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, that is, a surface protective film 8 (fifth step, FIG. 5).
- the surface protective film 8 (polybenzoxazole pattern cured film) 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 metal layer 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 relieving 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 has been proposed in order to omit the process of forming the metal layer 9 (UBM).
- UBM-free structure it is preferable to form the second conductor layer 7 connected to the bumps 10 to be thicker than usual in order to suppress an increase in electrical resistance due to the generation of intermetallic compounds.
- the electronic component of the present invention has a cured film obtained from the positive photosensitive resin composition of the present invention. Specifically, it can have the pattern cured film obtained by the manufacturing method of said pattern cured film.
- the cured film can be used as a surface protective film of an electronic component, a cover coat layer, an interlayer insulating film, an interlayer insulating film of a multilayer wiring board, or the like.
- electronic components include semiconductor devices, multilayer wiring boards, and various electronic devices.
- the semiconductor device described above is an embodiment of the electronic component of the present invention, but is not limited to the above, and can have various structures.
- polystyrene conversion The above solution was poured into 3 liters of water, and the precipitate was collected, washed with pure water three times, and then reduced in pressure to obtain polyhydroxyamide (polybenzoxazole precursor) (hereinafter referred to as polymer I and To do).
- the weight average molecular weight of the polymer I was 33,100, and the degree of dispersion was 2.0.
- the weight average molecular weight was calculated
- Measuring device Detector L4000 manufactured by Hitachi, Ltd.
- UV pump L6000 manufactured by Hitachi, Ltd.
- Synthesis example 2 Except that 10.69 g (40 mmol) of dodecanedioic acid dichloride used in Synthesis Example 1 was replaced with 7.48 g (28 mmol) of decanedioic acid dichloride and 3.56 g (12 mmol) of 4,4′-diphenyl ether dicarboxylic acid dichloride. Synthesis was performed in the same manner as in Synthesis Example 1 to obtain polyhydroxyamide (hereinafter referred to as polymer II). Polymer II had a weight average molecular weight of 41,800 and a dispersity of 2.0.
- Synthesis example 3 A 0.2 liter flask equipped with a stirrer and a thermometer was charged with 60 g of N-methylpyrrolidone, and 13.92 g (38 mmol) of 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane was added. Added and stirred to dissolve. Subsequently, while maintaining the temperature at 0 to 5 ° C., 11.86 g (40 mmol) of 4,4′-diphenyl ether dicarboxylic acid dichloride was added dropwise over 10 minutes, and then the temperature was returned to room temperature and the solution in the flask was stirred for 3 hours.
- Polymer III had a weight average molecular weight of 22,400 and a dispersity of 3.2.
- Examples 1 to 10, Comparative Examples 1 to 5 Preparation of photosensitive resin composition
- Each component was mixed with the component and the compounding quantity shown in Table 1, and the photosensitive resin composition was prepared.
- the compounding quantity shown in Table 1 is the mass part of each component with respect to 100 mass parts of (a) component.
- the components used in Examples 1 to 10 and Comparative Examples 1 to 5 are as follows.
- C-1 a compound having the following structure (product name “TPPA428” manufactured by Daito Chemix Co., Ltd.)
- C-2 Compound having the following structure (trade name “TPPA528” manufactured by Daito Chemix Co., Ltd.)
- the obtained photosensitive resin composition was spin-coated on a Si substrate and a Cu substrate to form a coating film having a dry film thickness of 7 to 12 ⁇ m.
- the obtained resin film-coated substrate was heated at 100 ° C. for 30 minutes in a nitrogen atmosphere using a vertical diffusion furnace ⁇ -TF (manufactured by Koyo Thermo System Co., Ltd.), and further at 175 ° C. or 200 ° C. for 1 hour. By heating, a cured film having a film thickness of 5 to 10 ⁇ m after curing was obtained.
- the cured film obtained from the positive photosensitive resin composition of the present invention has excellent adhesion to both the Si substrate and the Cu substrate.
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Abstract
Description
一方、ポリイミドやポリベンゾオキサゾールの膜特性、特に接着性は、硬化温度が低いほど低下する傾向があった。特に、200℃以下で硬化を行った場合、種々の基板に対する接着性が低かった。
本発明者らは、上記問題に鑑みてさらなる検討を重ねた結果、ポリベンゾオキサゾール前駆体に対して反応性の高い架橋剤を組み合わせることで、樹脂組成物を200℃以下という低温で硬化した場合であっても、種々の基板に対して優れた接着性を発揮することを見出した。
本発明によれば、以下のポジ型感光性樹脂組成物等が提供される。
1.(a)ポリベンゾオキサゾール前駆体と、(b)架橋剤と、(c)感光剤と、(d)溶剤とを含有し、
前記(a)成分が下記式(1)で表される構造単位を含み、前記(b)成分が下記式(2)で表される化合物であるポジ型感光性樹脂組成物。
2.前記(b)成分を、前記(a)成分100質量部に対して5質量部以上含む1に記載のポジ型感光性樹脂組成物。
3.前記(c)成分が、ジアゾナフトキノン化合物である1又は2に記載のポジ型感光性樹脂組成物。
4.1~3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、乾燥して感光性樹脂膜を形成する工程と、
前記感光性樹脂膜を所定のパターンに露光する工程と、
露光後の樹脂膜をアルカリ水溶液を用いて現像し、パターン樹脂膜を形成する工程と、
前記パターン樹脂膜を加熱処理する工程と、
を含むパターン硬化膜の製造方法。
5.前記パターン樹脂膜を加熱処理する工程において、加熱処理温度が250℃以下である4に記載のパターン硬化膜の製造方法。
6.1~3のいずれかに記載のポジ型感光性樹脂組成物から得られる硬化膜。
7.6に記載の硬化膜を用いた、層間絶縁膜、カバーコート層又は表面保護膜。
8.7に記載の層間絶縁膜、カバーコート層又は表面保護膜を有する電子部品。
本発明のポジ型感光性樹脂組成物は、(a)ポリベンゾオキサゾール前駆体、(b)架橋剤、(c)感光剤及び(d)溶剤を含有する。以下、これら成分を単に(a)成分、(b)成分、(c)成分及び(d)成分と記す場合がある。以下、各成分について説明する。
(a)成分は下記式(1)で表される構造単位を含む。
このような構造であると、パターニング時に使用する光源であるi線における透過率が高くなる。
aは1~5の整数が好ましい。
原料であるジカルボン酸としては、ドデカン二酸、デカン二酸、2,2-ビス(4-カルボキシフェニル)-1,1,1,3,3,3-ヘキサフルオロプロパン、2,2-ビス(p-カルボキシフェニル)プロパン、5-tert-ブチルイソフタル酸等が挙げられ、Vとしては、これらから2つのカルボキシ基を除いた基が挙げられる。
式(1)示される構造単位以外の構造単位としては、Vがジフェニルエーテル化合物由来の骨格であるもの等が挙げられる。
アルカリ水溶液としては、テトラメチルアンモニウムヒドロキシド(TMAH)水溶液等の有機アンモニウム水溶液、金属水酸化物水溶液、有機アミン水溶液等が挙げられる。一般には、濃度が2.38質量%のTMAH水溶液を用いることが好ましい。よって、(a)成分はTMAH水溶液に対して可溶であることが好ましい。
重量平均分子量は、ゲルパーミエーションクロマトグラフ法によって測定することができ、標準ポリスチレン検量線を用いて換算することによって求めることができる。
また、重量平均分子量を数平均分子量で除した分散度は1~4が好ましく、1~3がより好ましい。
(b)成分の架橋剤は下記式(2)で表される化合物である。
R2の炭素数1~6のアルキル基としては、メチル基、エチル基又はブチル基が挙げられる。
本発明のポジ型感光性樹脂組成物は、(a)成分であるポリベンゾオキサゾール前駆体とともに、(c)成分として感光剤を含む。感光剤は、活性光線の照射を受けて酸を発生する化合物であり、光を照射した部分のアルカリ水溶液への可溶性を増大させる機能を有する。
ジアゾナフトキノン化合物とは、ジアゾナフトキノン構造を有する化合物である。
(d)成分としては、γ-ブチロラクトン、乳酸エチル、プロピレングリコールモノメチルエーテルアセテート、酢酸ベンジル、n-ブチルアセテート、エトキシエチルプロピオネート、3-メチルメトキシプロピオネート、N-メチル-2-ピロリドン、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、ジメチルスルホキシド、ヘキサメチルホスホリルアミド、テトラメチレンスルホン、シクロヘキサノン、シクロペンタノン、ジエチルケトン、ジイソブチルケトン、メチルアミルケトン等が挙げられる。通常、感光性樹脂組成物中の他の成分を充分に溶解できるものであれば特に制限はない。
この中でも、各成分の溶解性と樹脂膜形成時の塗布性に優れる観点から、γ-ブチロラクトン、乳酸エチル、プロピレングリコールモノメチルエーテルアセテート、N-メチル-2-ピロリドン、N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、ジメチルスルホキシドを用いることが好ましい。
本発明のパターン硬化膜の製造方法は、上記のポジ型感光性樹脂組成物を基板上に塗布、乾燥して感光性樹脂膜を形成する工程と、感光性樹脂膜を所定のパターンに露光する工程と、露光後の樹脂膜を、アルカリ水溶液を用いて現像しパターン樹脂膜を形成する工程と、パターン樹脂膜を加熱処理する工程とを含む。
以下、各工程について説明する。
本工程では、ポジ型感光性樹脂組成物を基板上に塗布、乾燥して感光性樹脂膜を形成する。
基板としては、ガラス、半導体、TiO2、SiO2等の金属酸化物絶縁体、窒化ケイ素、銅、銅合金等が挙げられる。塗布方法に特に制限はないが、スピナー等を用いて行うことができる。
感光性樹脂膜の膜厚は、5~100μmが好ましく、8~50μmがより好ましく、10~30μmがさらに好ましい。
本工程では、マスクを介して、感光性樹脂膜を所定のパターンに露光する。
照射する活性光線は、i線を含む紫外線、可視光線、放射線等が挙げられ、i線が好ましい。露光装置としては、平行露光機、投影露光機、ステッパ、スキャナ露光機等を用いることができる。
露光工程を経た樹脂膜を現像処理することで、パターン形成された樹脂膜(パターン樹脂膜)を得ることができる。一般的に、ポジ型感光性樹脂組成物を用いた場合、露光部を現像液で除去する。
アルカリ水溶液の濃度は、0.1~10質量%が好ましい。
パターン樹脂膜を加熱処理することにより、(a)成分の官能基同士、又は、(a)成分と(b)成分間等に架橋構造を形成し、パターン硬化膜を得ることができる。また、加熱処理工程によって(a)成分のポリベンゾオキサゾール前駆体が脱水閉環反応を起こし、対応するポリベンゾオキサゾールとすることができる。
次に、本発明によるパターン硬化膜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1~7は、多層配線構造を有するファンアウトパッケージ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ファンアウトパッケージの概略断面図である。
この上に、ポリイミド樹脂等の膜が層間絶縁膜4としてスピンコート法等で形成される(第1の工程、図1)。
窓6A部分に露出している層間絶縁膜4は、酸素、四フッ化炭素等のガスを用いるドライエッチング手段によって選択的にエッチングされ、窓6Bが形成される。次いで、窓6Bから露出した第1導体層3を腐食することなく、感光性樹脂層5のみを腐食するようなエッチング溶液を用いて感光性樹脂層5が完全に除去される(第3の工程、図3)。
次に、本発明の電子部品について説明する。本発明の電子部品は、本発明のポジ型感光性樹脂組成物から得られる硬化膜を有する。具体的には、上記のパターン硬化膜の製造方法によって得られたパターン硬化膜を有することができる。
電子部品としては、半導体装置、多層配線板、各種電子デバイス等が挙げられる。上述した半導体装置は本発明の電子部品の一実施形態であるが、上記に限定されず、様々な構造とすることができる。
合成例1
撹拌機、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13.92g(38mmol)を添加し、撹拌溶解した。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10.69g(40mmol)を10分間で滴下した後、フラスコ中の溶液を60分間撹拌した。上記溶液を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Iとする)。ポリマーIの重量平均分子量は33,100、分散度は2.0であった。重量平均分子量は、ゲルパーミエーションクロマトグラフ(GPC)法標準ポリスチレン換算により求めた。
測定装置:検出器 株式会社日立製作所社製L4000
UV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
合成例1で使用したドデカン二酸ジクロリド10.69g(40mmol)を、デカン二酸ジクロリド7.48g(28mmol)及び4,4’-ジフェニルエーテルジカルボン酸ジクロリド3.56g(12mmol)に置き換えた以外は、合成例1と同様に合成を行い、ポリヒドロキシアミドを得た(以下、ポリマーIIとする)。ポリマーIIの重量平均分子量は41,800、分散度は2.0であった。
撹拌機、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13.92g(38mmol)を添加し、撹拌溶解した。続いて、温度を0~5℃に保ちながら、4,4’-ジフェニルエーテルジカルボン酸ジクロリド11.86g(40mmol)を10分間で滴下した後、室温に戻しフラスコ中の溶液を3時間撹拌した。上記溶液を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を得た(以下、ポリマーIIIとする)。ポリマーIIIの重量平均分子量は22,400、分散度は3.2であった。
[感光性樹脂組成物の調製]
表1に示す成分及び配合量にて各成分を混合し、感光性樹脂組成物を調製した。表1に示す配合量は、(a)成分100質量部に対する各成分の質量部である。
実施例1~10、比較例1~5で用いた各成分は以下の通りである。
・ポリマーI:合成例1で得られたポリマーI
・ポリマーII:合成例2で得られたポリマーII
<(a’)成分:ポリベンゾオキサゾール前駆体>
・ポリマーIII:合成例3で得られたポリマーIII
・(b-1):下記構造を有する酸変性アルキル化メラミンホルムアルデヒド(Allnex社製、商品名「サイメル300」)
・(b-2):下記構造を有するメチル化尿素樹脂(株式会社三和ケミカル製、商品名「ニカラックMX-270」)
・(c-1):下記構造を有する化合物(ダイトーケミックス株式会社製、商品名「TPPA428」)
BLO:γ-ブチロラクトン
NMP:N-メチルピロリドン
得られた感光性樹脂組成物を、Si基板及びCu基板上にスピンコートし、乾燥膜厚が7~12μmの塗膜を形成した。得られた樹脂膜付き基板について、縦型拡散炉μ-TF(光洋サーモシステム株式会社製)を用いて、窒素雰囲気下、100℃で30分加熱した後、さらに175℃又は200℃で1時間加熱して、硬化後膜厚5~10μmの硬化膜を得た。
得られた硬化膜に対してクロスカット試験を行い、Si基板及びCu基板に対する密着性を評価した。具体的には、まず、基板上の硬化膜表面の中央に、カッターガイドを用いて直交する縦横11本ずつの平行線を1mmの間隔で引き、1cm2の中に100個の正方形ができるように碁盤目状の切り傷をつけた。次に碁盤目に対してセロハンテープによるピーリングテストを行い、試験後に基板上に残る正方形の数を数えた。
残った正方形が100個の場合を○、1~99個の場合を△、0個の場合を×とした。結果を表1に示す。「△」は、残った正方形の個数も併記する。
硬化膜をプレッシャークッカー装置に入れ、121℃、2atm、100%RHの条件下で100時間処理した(PCT処理)。その後、初期接着性と同様にピーリングテストを行い、接着性を評価した。結果を表1に示す。
この明細書に記載の文献の内容を全てここに援用する。
Claims (8)
- 前記(b)成分を、前記(a)成分100質量部に対して5質量部以上含む請求項1に記載のポジ型感光性樹脂組成物。
- 前記(c)成分が、ジアゾナフトキノン化合物である請求項1又は2に記載のポジ型感光性樹脂組成物。
- 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を基板上に塗布、乾燥して感光性樹脂膜を形成する工程と、
前記感光性樹脂膜を所定のパターンに露光する工程と、
露光後の樹脂膜をアルカリ水溶液を用いて現像し、パターン樹脂膜を形成する工程と、
前記パターン樹脂膜を加熱処理する工程と、
を含むパターン硬化膜の製造方法。 - 前記パターン樹脂膜を加熱処理する工程において、加熱処理温度が250℃以下である請求項4に記載のパターン硬化膜の製造方法。
- 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から得られる硬化膜。
- 請求項6に記載の硬化膜を用いた、層間絶縁膜、カバーコート層又は表面保護膜。
- 請求項7に記載の層間絶縁膜、カバーコート層又は表面保護膜を有する電子部品。
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KR20180101441A (ko) * | 2016-02-05 | 2018-09-12 | 히다치 가세이듀퐁 마이쿠로시스데무즈 가부시키가이샤 | 포지티브형 감광성 수지 조성물 |
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WO2009081950A1 (ja) * | 2007-12-26 | 2009-07-02 | Asahi Kasei E-Materials Corporation | 耐熱性樹脂前駆体及びそれを用いた感光性樹脂組成物 |
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JP2011148971A (ja) * | 2009-08-14 | 2011-08-04 | Asahi Kasei E-Materials Corp | アルカリ可溶性重合体、それを含む感光性樹脂組成物、及びその用途 |
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JP2013205801A (ja) * | 2012-03-29 | 2013-10-07 | Sumitomo Bakelite Co Ltd | 感光性樹脂組成物及びその硬化膜、保護膜、絶縁膜並びに半導体装置及び表示体装置 |
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JPWO2017134700A1 (ja) | 2018-11-01 |
CN108604060A (zh) | 2018-09-28 |
SG11201806171XA (en) | 2018-08-30 |
TWI714717B (zh) | 2021-01-01 |
KR20180101440A (ko) | 2018-09-12 |
JP6673369B2 (ja) | 2020-03-25 |
US20190041748A1 (en) | 2019-02-07 |
EP3413131A1 (en) | 2018-12-12 |
EP3413131B1 (en) | 2021-06-09 |
CN108604060B (zh) | 2021-06-25 |
US11592743B2 (en) | 2023-02-28 |
TW201800843A (zh) | 2018-01-01 |
EP3413131A4 (en) | 2019-10-09 |
PH12018501572A1 (en) | 2019-04-15 |
PH12018501572B1 (en) | 2019-04-15 |
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