WO2020129917A1 - 仮固定用樹脂組成物、仮固定用樹脂フィルム及び仮固定用シート並びに半導体装置の製造方法 - Google Patents
仮固定用樹脂組成物、仮固定用樹脂フィルム及び仮固定用シート並びに半導体装置の製造方法 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/04—Epoxynovolacs
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/068—Copolymers with monomers not covered by C09J133/06 containing glycidyl groups
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
- C09J161/04—Condensation polymers of aldehydes or ketones with phenols only
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
- C09J163/04—Epoxynovolacs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L21/6836—Wafer tapes, e.g. grinding or dicing support tapes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68327—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68327—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
- H01L2221/68336—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used during dicing or grinding involving stretching of the auxiliary support post dicing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/6834—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support used to protect an active side of a device or wafer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68381—Details of chemical or physical process used for separating the auxiliary support from a device or wafer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
- H01L2221/67—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere
- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
- H01L2221/68381—Details of chemical or physical process used for separating the auxiliary support from a device or wafer
- H01L2221/68386—Separation by peeling
Definitions
- the present invention relates to a temporary fixing resin composition, a temporary fixing resin film and a temporary fixing sheet, and a method for manufacturing a semiconductor device.
- stacked MCP Multi Chip Package
- a film adhesive is widely used as an adhesive for die bonding in mounting a semiconductor element.
- the operation speed of electronic devices tends to be slow because the data processing speed is limited.
- power saving is also being demanded. From such a viewpoint, in recent years, an electronic device device having a new structure in which semiconductor elements are connected to each other by a through electrode instead of a wire bond has been developed for the purpose of further speeding up and power saving.
- BG tape back grinding tape
- the semiconductor wafer used in the grinding step has a circuit formed on the front surface side, and due to the influence thereof, when thinned by grinding, warpage is likely to occur. Since the BG tape is a deformable tape material, it cannot sufficiently support a thinned semiconductor wafer, and the semiconductor wafer is likely to warp.
- peeling method examples include a method of dissolving the pressure-sensitive adhesive with a solvent, a method of reducing the pressure-sensitive adhesiveness by heating, and a method of modifying or eliminating the pressure-sensitive adhesive by laser irradiation (Patent Documents 1 and 2).
- the productivity tends to decrease.
- the method of lowering the adhesiveness by heating is not applicable from the viewpoint of heat resistance to the application of the process for forming the through electrode and the like, while the influence on the semiconductor element by heating is concerned.
- the method of modifying or eliminating the adhesive by laser irradiation it is indispensable to introduce expensive laser equipment, and considerable investment is indispensable to apply such a process.
- the electronic parts to be processed are not limited to those with high smoothness, and there is an increasing trend in the case where a wafer with a solder ball on the circuit surface and an uneven surface of more than 80 ⁇ m is the processing target.
- a component having such large irregularities is the object to be processed, if the adhesive is sufficiently embedded in the irregularities, it becomes difficult to peel the adhesive from the surface having irregularities.
- the adhesive strength of the solder balls is insufficient, there is a concern that the solder balls may be missing when the adhesive is peeled off.
- shelf life storage stability under a normal use environment of a clean room (UV cut, 25° C.) (may be referred to as “shelf life”) It is also important. Since an excellent step embedding property is required, if the shelf life is insufficient, insufficient embedding occurs, which greatly affects productivity and is not preferable.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a temporary fixing resin composition that can favorably process electronic components. Another object of the present invention is to provide a temporary fixing resin film and a temporary fixing sheet using the above temporary fixing resin composition, and a method for manufacturing a semiconductor device.
- the resin composition for temporary fixing comprises a temporary fixing step of temporarily fixing a semiconductor wafer to a support through a temporary fixing material, a processing step of processing the semiconductor wafer temporarily fixed to the support, and a post-processing step.
- a temporary fixing step of temporarily fixing a semiconductor wafer to a support through a temporary fixing material a processing step of processing the semiconductor wafer temporarily fixed to the support, and a post-processing step.
- the method for processing a semiconductor wafer including a separation step of separating the semiconductor wafer from the temporary fixing material, for forming the temporary fixing material, (A) a thermoplastic resin, (B) a thermosetting resin, (C) a silicone compound, ,
- the shear viscosity at 120° C. is 4000 Pa ⁇ s or less, and the change rate of the shear viscosity after standing for 7 days in an atmosphere of 25° C. is within 30%.
- the temporary fixing resin composition of the present invention may further contain (D) a curing accelerator.
- the shear viscosity at 120° C. of the temporary fixing resin composition is 4000 Pa ⁇ s or less (preferably 100 to 3000 Pa ⁇ s), even if the surface of the semiconductor wafer to be processed has irregularities, the step embedding property and Both of the peelability after processing can be made sufficiently high. As a result, according to the present invention, the semiconductor wafer can be satisfactorily processed, and as a result, electronic components can be manufactured with high productivity.
- thermosetting resin in the temporary fixing resin composition is, for example, 10 to 500 parts by mass with respect to 100 parts by mass of the (A) thermoplastic resin from the viewpoint of film formability.
- the thermosetting resin (B) may include at least one of an epoxy resin and a phenol resin.
- the thermoplastic resin is, for example, a reactive group-containing (meth)acrylic copolymer containing a reactive group-containing (meth)acrylic monomer as a copolymerization component.
- a reactive group-containing (meth)acrylic copolymer an epoxy group-containing (meth)containing (meth)acrylic monomer having an epoxy group is contained in an amount of 1.0 to 10% by mass based on the total amount of the copolymerization components.
- Acrylic copolymers may be mentioned.
- an organic group-modified silicone can be adopted from the viewpoint of compatibility with the resin component.
- the present invention provides a temporary fixing resin film having a single-layer or multi-layer structure and including at least one layer comprising the temporary fixing resin composition (hereinafter, sometimes referred to as “temporary fixing resin layer”). ..
- temporary fixing resin layer By preliminarily forming the temporary fixing resin composition in the form of a film having a sufficiently uniform thickness, it is possible to sufficiently suppress the variation in thickness that can occur in the processed semiconductor wafer, and to efficiently form the semiconductor wafer. It can be processed.
- the temporary fixing resin film of the present invention may have two temporary fixing resin layers. Since the temporary fixing resin film has a two-layer structure, there is an advantage that the step embedding property and the peeling property after processing can be more highly compatible.
- one temporary fixing resin layer may be in direct contact with another temporary fixing resin layer.
- the two layers may be integrated to have a single-layer structure, or an interface may exist between the two layers to maintain the two-layer structure.
- these temporary fixing resin films are interposed between the support and the semiconductor wafer and can be used for temporarily fixing the semiconductor wafer to the support.
- the present invention provides a temporary fixing sheet including the temporary fixing resin film and a support film provided on at least one surface of the temporary fixing resin film. It is preferable that the surface of the support film that is in contact with the temporary fixing resin film has releasability.
- the present invention provides a method for manufacturing a semiconductor device using the temporary fixing resin composition.
- the method for manufacturing a semiconductor device according to the present invention includes a temporary fixing step of temporarily fixing a semiconductor wafer to a support through a temporary fixing material made of a resin composition for temporary fixing, and a temporary fixing to the support. And a separating step of separating the processed semiconductor wafer from the temporary fixing material.
- a temporary fixing resin composition that can favorably process an electronic component. Further, according to the present invention, it is possible to provide a temporary fixing resin film and a temporary fixing sheet using the above temporary fixing resin composition, and a method for manufacturing a semiconductor device.
- FIG. 1(A) is a top view showing an embodiment of the temporary fixing sheet
- FIG. 1(B) is a schematic cross-sectional view taken along the line II of FIG. 1(A).
- FIG. 2(A) is a top view showing an embodiment of a temporary fixing sheet having two temporary fixing resin layers
- FIG. 2(B) is taken along line II-II of FIG. 2(A).
- FIG. 3(A) is a top view showing another embodiment of the temporary fixing sheet according to the present invention
- FIG. 3(B) is a schematic cross-sectional view taken along line III-III of FIG. 3(A).
- FIG. 4(A) is a top view showing another embodiment of the temporary fixing sheet according to the present invention
- FIG. 4(B) is a schematic cross-sectional view taken along line IV-IV of FIG. 4(A).
- .. 5(A) to 5(C) are schematic cross-sectional views for explaining one embodiment of a method for processing a semiconductor wafer
- FIG. 5(D) is an upper surface showing the back surface of the processed semiconductor wafer.
- FIG. 6A to 6D are schematic cross-sectional views for explaining an embodiment of a method for processing a semiconductor wafer.
- FIG. 7(A) is a cross-sectional view schematically showing an example of a semiconductor element manufactured by the processing method according to the present invention
- FIG. 7(B) is an example of an electronic device apparatus in which a plurality of semiconductor elements are stacked. It is a sectional view showing typically.
- the temporary fixing material resin composition contains (A) a thermoplastic resin, (B) a thermosetting resin, and (C) a silicone compound, and has a shear viscosity at 120° C. of 4000 Pa ⁇ s or less. And the change rate of the shear viscosity after standing for 7 days in an atmosphere of 25° C. is within 30%.
- this temporary fixing material resin composition as a temporary fixing material (temporary fixing resin layer)
- a semiconductor wafer can be favorably processed, and thus an electronic component can be manufactured with high productivity. ..
- the shear viscosity of the temporary fixing resin composition at 120° C. is 4000 Pa ⁇ s or less, preferably 100 to 3000 Pa ⁇ s, and 300 to 2500 Pa ⁇ s or 500 to 2000 Pa ⁇ s. It may be.
- the shear viscosity of the resin composition for temporary fixing at 120° C. is 4000 Pa ⁇ s or less, excellent step embedding property can be achieved even if the surface of the semiconductor wafer to be processed has irregularities, and also for temporary fixing. It is also possible to achieve excellent releasability from the surface having irregularities after the irregularity is embedded in the layer made of the resin composition.
- the shear viscosity at 120° C. of the temporary fixing resin composition is 100 Pa ⁇ s or more, the state of the film can be maintained during heating after the processing of the semiconductor wafer.
- the rate of change in the shear viscosity after leaving the temporary fixing material resin composition in an atmosphere of 25° C. for 7 days is within 30%, preferably within the range of 0 to 25%, and within the range of 0 to 20 as described above. % Or 0 to 15%. When the rate of change is within 30%, the temporary fixing material resin composition has excellent storage stability, which makes it possible to manufacture electronic components with high productivity.
- the “shear viscosity at 120° C. before standing in an atmosphere of 25° C. for 7 days” is preferably measured using a temporary fixing material resin composition that is not exposed to the external environment as a sample, for example, after preparation. Alternatively, it is preferable to measure the sample within 5 hours after opening. Further, the relative humidity of the environment left for 7 days may be about 55%.
- the shear viscosity of the resin composition for temporary fixing material before and after standing for 7 days was 20° C./minute while applying 5% strain to the resin film for temporary fixing, using ARES (manufactured by Rheometric Scientific). It means the measured value when the measurement is performed while raising the temperature at the heating rate.
- the storage elastic modulus of the temporary fixing material resin composition after curing is preferably 20 MPa or more at 25° C., and more preferably 50 MPa or more. If the storage elastic modulus is 20 MPa or more, there is a tendency that the electronic component and the support can be sufficiently fixed when the electronic component is thinned.
- the upper limit value of this storage elastic modulus is, for example, 6000 MPa or less.
- the storage elastic modulus of the temporary fixing material resin composition after curing is measured by using a dynamic viscoelasticity measuring device (manufactured by UBM Co., Ltd.) while increasing the temperature at a heating rate of 3° C./min. means.
- thermoplastic resin (A) any resin can be used without particular limitation as long as it is a resin having thermoplasticity before the film is laminated on the electronic component or the support.
- the thermoplastic resin may be a resin that forms a crosslinked structure by heating or the like.
- thermoplastic resin a polymer having a crosslinkable functional group
- examples of the polymer having a crosslinkable functional group include a thermoplastic polyimide resin, a (meth)acrylic copolymer having a crosslinkable functional group, a urethane resin polyphenylene ether resin, a polyetherimide resin, a phenoxy resin, and a modified polyphenylene ether resin.
- a (meth)acrylic copolymer having a crosslinkable functional group is preferable.
- the above resins may be used alone or in combination of two or more.
- the (meth)acrylic copolymer having a crosslinkable functional group one obtained by a polymerization method such as pearl polymerization or solution polymerization may be used, or a commercially available product may be used.
- the polymer having a crosslinkable functional group may have a crosslinkable functional group in the polymer chain or at the polymer chain terminal.
- Specific examples of the crosslinkable functional group include an epoxy group, an alcoholic hydroxyl group, a phenolic hydroxyl group, and a carboxyl group.
- a carboxyl group is preferable.
- Carboxyl groups can be introduced into the polymer chain by using acrylic acid.
- the glass transition temperature (hereinafter sometimes referred to as “Tg”) of the thermoplastic resin (A) is preferably ⁇ 50° C. to 50° C., and more preferably ⁇ 40° C. to 20° C.
- Tg is in such a range, it is possible to obtain sufficient fluidity while suppressing deterioration of handleability due to excessively high tack force, and further to lower the elastic modulus after curing. Therefore, it is possible to further suppress the peel strength from becoming too high.
- Tg is a midpoint glass transition temperature value when a thermoplastic resin is measured using a differential scanning calorimetry (DSC, for example, “Thermo Plus 2” manufactured by Rigaku Corporation).
- DSC differential scanning calorimetry
- the above Tg is the midpoint glass transition calculated by a method in accordance with JIS K 7121:1987 by measuring the change in heat quantity under the conditions of a temperature rising rate of 10°C/min and a measurement temperature of -80 to 80°C. Is the temperature.
- the weight average molecular weight of the (A) thermoplastic resin is not particularly limited and is preferably 100,000 to 1,200,000, more preferably 200,000 to 1,000,000. When the weight average molecular weight of the thermoplastic resin is within such a range, it becomes easy to secure film-forming property and fluidity.
- the weight average molecular weight is a polystyrene conversion value using a calibration curve based on standard polystyrene by gel permeation chromatography (GPC).
- thermosetting resin (B) examples include epoxy resin, acrylic resin, silicone resin, phenol resin, thermosetting polyimide resin, polyurethane resin, melamine resin, and urea resin, and these may be used alone. They may be used, or two or more kinds may be used in combination.
- the epoxy resin is not particularly limited as long as it cures and has a heat resistance effect.
- a bifunctional epoxy resin such as bisphenol A type epoxy, a novolac type epoxy resin such as phenol novolac type epoxy resin, and a cresol novolac type epoxy resin can be used.
- the epoxy resin a generally known one such as a polyfunctional epoxy resin, a glycidylamine type epoxy resin, a heterocycle-containing epoxy resin, an alicyclic epoxy resin can be applied.
- jER registered trademark
- Mitsubishi Chemical Corporation Epicoat 807, Epicoat 815, Epicoat 825, Epicoat 827, Epicoat 828, Epicoat 834, Epicoat 1001, Epicoat 1004, Epicoat 1007, Epicoat 1009, "Epicote” is a registered trademark
- DER-330, DER-301, DER-361 manufactured by Dow Chemical Co., Ltd. and YD8125, YDF8170 manufactured by Nippon Steel & Sumitomo Metal Corporation.
- Examples of the phenol novolac type epoxy resin include Epicoat 152 and Epicoat 154 manufactured by Japan Epoxy Resin Co., Ltd., EPPN-201 manufactured by Nippon Kayaku Co., Ltd., and DEN-438 manufactured by Dow Chemical Co., Ltd.
- Examples of o-cresol novolac type epoxy resins include EOCN-102S, EOCN-103S, EOCN-104S, EOCN-1012, EOCN-1025, EOCN-1027 (“EOCN” is a registered trademark) and Nippon Steel by Nippon Kayaku Co., Ltd.
- Examples include YDCN701, YDCN702, YDCN703, and YDCN704 manufactured by Sumikin Chemical Co., Ltd.
- the amine type epoxy resin Epicoat 604 manufactured by Japan Epoxy Resin Co., Ltd., YH-434 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd., TETRAD-X and TETRAD-C manufactured by Mitsubishi Gas Chemical Co., Ltd.
- TTRAD is a registered trademark
- ELM-120 manufactured by Sumitomo Chemical Co., Ltd.
- heterocycle-containing epoxy resin examples include Araldite PT810 manufactured by Ciba Specialty Chemicals, ERL4234, ERL4299, ERL4221, ERL4206 manufactured by UCC. These epoxy resins may be used alone or in combination of two or more.
- thermosetting resin When using an epoxy resin as the thermosetting resin, it is preferable to use an epoxy resin curing agent together.
- the epoxy resin curing agent (B) As the epoxy resin curing agent (B), a commonly used known curing agent can be used.
- the epoxy resin curing agent and the curing agent are collectively referred to as "thermosetting component".
- the epoxy resin curing agent include amines, polyamides, acid anhydrides, polysulfides, boron trifluoride, bisphenols having two or more phenolic hydroxyl groups such as bisphenol A, bisphenol F, and bisphenol S in one molecule, Examples thereof include phenol resins such as phenol novolac resin, bisphenol A novolac resin, and cresol novolac resin.
- the epoxy resin curing agent is preferably a phenol resin such as phenol novolac resin, bisphenol A novolac resin, or cresol novolac resin from the viewpoint of excellent resistance to electrolytic corrosion when absorbing moisture.
- phenolic resins as the epoxy resin curing agent, preferred are, for example, DIC Corporation, trade names: Phenolite LF2882, Phenolite LF2822, Phenolite TD-2090, Phenolite TD-2149, Phenolite VH.
- Phenolite VH4170 manufactured by Meiwa Kasei Co., Ltd., trade name: H-1, Japan Epoxy Resin Co., Ltd., trade name: jER Cure MP402FPY, Epicure YL6065, Epicure YLH129B65 and Mitsui Chemicals, Inc., trade name: Milex Examples include XL, Milex XLC, Milex RN, Milex RS, and Milex VR (“Phenolite”, “Epicure”, and “Milex” are registered trademarks).
- the content of the (B) thermosetting resin in the temporary fixing resin composition is preferably 10 to 500 parts by mass, and more preferably 20 to 300 parts by mass, relative to 100 parts by mass of the (A) thermoplastic resin.
- the temporary fixing resin film can have sufficient low-temperature adhesiveness, heat resistance, curability, and peelability.
- the content of the thermosetting resin (B) is 10 parts by mass or more, the sticking property and the heat resistance are improved, the holding property at the time of back grinding is also improved, and the wafer tends to be hard to break.
- the content of the (B) thermosetting resin is 500 parts by mass or less, the viscosity before curing is unlikely to be excessively low, the curing can be performed in a relatively short time, and the retention property of the electronic component to the support is high. And the releasability from the support tend to be compatible.
- the silicone compound (C) can be used without particular limitation as long as it has a polysiloxane structure.
- silicone modified resin straight silicone oil, non-reactive modified silicone oil, reactive modified silicone oil, etc. may be mentioned.
- the silicone compounds may be used alone or in combination of two or more.
- the temperature is 100° C. or less. Even at a low temperature, peeling can be easily performed without using a solvent.
- the silicone compound used in this embodiment is a silicone-modified resin
- silicone-modified resin there is no particular limitation as long as it is a resin modified with silicone.
- the silicone-modified resin is preferably a silicone-modified alkyd resin. By including the silicone-modified alkyd resin, it becomes possible to more easily peel the temporary fixing resin film from the electronic component without using a solvent.
- silicone compound used in this embodiment is a modified silicone oil
- polyether modified silicone alkyl modified silicone
- epoxy modified silicone are preferable.
- the silicone as described above can be used without particular limitation as long as it is compatible with the high molecular weight substance.
- silicone SH3773M, L-7001, SH-550, SH-710 manufactured by Toray Dow Corning Co., Ltd., X-22-163, KF-105, X-22-163B, X manufactured by Shin-Etsu Chemical Co., Ltd. -22-163C, BYK-UV3500 manufactured by BYK, and the like.
- the content of the (C) silicone compound in the temporary fixing resin composition is preferably 0 to 100 parts by mass, and more preferably 0.01 to 80 parts by mass, relative to 100 parts by mass of the (A) thermoplastic resin.
- the content of the silicone compound (C) is within the above range, it becomes possible to achieve both a high level of adhesion at the time of processing an electronic component and a high level of releasability after processing.
- the temporary fixing resin composition may include (D) a curing accelerator.
- the (D) curing accelerator include imidazoles, dicyandiamide derivatives, dicarboxylic acid dihydrazides, triphenylphosphine, tetraphenylphosphonium tetraphenylborate, 2-ethyl-4-methylimidazole-tetraphenylborate, 1,8-diazabicyclo.
- Examples include [5,4,0]undecene-7-tetraphenylborate. These may be used alone or in combination of two or more.
- thermoplastic resin includes a (meth)acrylic copolymer having an epoxy group
- curing accelerator that accelerates curing of the epoxy group contained in the acrylic copolymer.
- the content of the (D) curing accelerator in the temporary fixing resin composition is preferably 0.01 to 5.0 parts by mass with respect to 100 parts by mass of the (A) thermoplastic resin.
- the content of the (C) curing accelerator is 0.01 parts by mass or more based on 100 parts by mass of the (A) thermoplastic resin, the temporary fixing resin composition is sufficiently contained in the heat history in the manufacturing process of the semiconductor element. Since it can be hardened, the electronic component and the support can be more reliably fixed.
- the content of the (D) curing accelerator is 5.0 parts by mass or less with respect to 100 parts by mass of the (A) thermoplastic resin, the melt viscosity of the temporary fixing resin film hardly increases due to heating during the manufacturing process. Therefore, the storage stability of the film tends to be further improved.
- the temporary fixing resin composition may include a filler (inorganic filler and/or organic filler), a silane coupling agent, and the like as components other than the above components.
- the inorganic filler examples include metal fillers such as silver powder, gold powder and copper powder; non-metal inorganic fillers such as silica, alumina, boron nitride, titania, glass, iron oxide and ceramics.
- the inorganic filler can be selected according to the desired function.
- the metal filler can be added for the purpose of imparting thixotropy to the film.
- the non-metal inorganic filler can be added for the purpose of imparting low thermal expansion and low hygroscopicity to the film.
- the inorganic filler one kind may be used alone, or two or more kinds may be used in combination.
- the inorganic filler preferably has an organic group on the surface. Since the surface of the inorganic filler is modified by an organic group, it is easy to improve dispersibility in an organic solvent when preparing a resin composition for forming a film, and adhesion and heat resistance of the film. Becomes
- the inorganic filler having an organic group on the surface can be obtained, for example, by mixing a silane coupling agent represented by the following general formula (B-1) with the inorganic filler and stirring the mixture at a temperature of 30° C. or higher. .. It can be confirmed by UV (ultraviolet) measurement, IR (infrared) measurement, XPS (X-ray photoelectron spectroscopy) measurement and the like that the surface of the inorganic filler is modified by the organic group.
- X represents an organic group selected from the group consisting of a phenyl group, a glycidoxy group, an acryloyl group, a methacryloyl group, a mercapto group, an amino group, a vinyl group, an isocyanate group and a methacryloxy group, and s Represents 0 or an integer of 1 to 10, and R 11 , R 12 and R 13 each independently represent an alkyl group having 1 to 10 carbon atoms.
- alkyl group having 1 to 10 carbon atoms examples include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, isopropyl group and isobutyl group.
- the alkyl group having 1 to 10 carbon atoms is preferably a methyl group, an ethyl group and a pentyl group from the viewpoint of easy availability.
- X is preferably an amino group, a glycidoxy group, a mercapto group and an isocyanate group, more preferably a glycidoxy group and a mercapto group.
- S in the formula (B-1) is preferably 0 to 5 and more preferably 0 to 4 from the viewpoint of suppressing film fluidity at high heat and improving heat resistance.
- Preferred silane coupling agents include, for example, trimethoxyphenylsilane, dimethyldimethoxyphenylsilane, triethoxyphenylsilane, dimethoxymethylphenylsilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, N- (2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3- Glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-isocyanatopropyltriethoxys
- 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane and 3-mercaptopropyltrimethoxysilane are preferable, and trimethoxyphenylsilane and 3-glycidoxy Propyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane are more preferable.
- the silane coupling agent may be used alone or in combination of two or more.
- the amount of the coupling agent used is preferably 0.01 to 50 parts by mass, and 0.05 parts by mass with respect to 100 parts by mass of the inorganic filler. Parts to 20 parts by mass is more preferable, and from the viewpoint of improving heat resistance, 0.5 to 10 parts by mass is further preferable.
- the content of the inorganic filler is preferably 300 parts by mass or less with respect to 100 parts by mass of the (A) thermoplastic resin, from the viewpoint of improving the handleability of the temporary fixing resin film in the B stage state and improving the low thermal expansion property. , 200 parts by mass or less, more preferably 100 parts by mass or less.
- the lower limit of the content of the inorganic filler is not particularly limited, and is preferably 5 parts by mass or more with respect to 100 parts by mass of the thermoplastic resin.
- Examples of the organic filler include carbon, rubber-based filler, silicone-based fine particles, polyamide fine particles, polyimide fine particles, and the like.
- the content of the organic filler is preferably 300 parts by mass or less, more preferably 200 parts by mass or less, and further preferably 100 parts by mass or less with respect to 100 parts by mass of the thermoplastic resin (A).
- the lower limit of the content of the organic filler is not particularly limited, and is preferably 5 parts by mass or more based on 100 parts by mass of the thermoplastic resin.
- the temporary fixing resin composition according to the present embodiment is a temporary fixing resin film, since it is a film-like pressure-sensitive adhesive, it is easier to control the film thickness, and the thickness between individual electronic components is increased. Variation can be reduced.
- the temporary fixing resin film according to the present embodiment can be attached to an electronic component or a support by a simple method such as laminating, and is excellent in workability.
- the thickness of the temporary fixing resin film is not particularly limited, and is preferably 10 to 350 ⁇ m from the viewpoint of sufficiently fixing the electronic component and the carrier for transportation.
- the thickness is 10 ⁇ m or more, the variation in the thickness during coating is small, and because the thickness is sufficient, the strength of the film or the cured product of the film becomes good, and the support for electronic parts and transportation is provided.
- the body and the body can be fixed more sufficiently.
- the thickness is 350 ⁇ m or less, variation in the thickness of the temporary fixing resin film is unlikely to occur, and the amount of residual solvent in the film can be easily reduced by sufficient drying, and the cured product of the film is heated. It is possible to further reduce foaming.
- FIG. 1A is a top view showing an embodiment of a temporary fixing sheet
- FIG. 1B is a schematic cross-sectional view taken along the line II of FIG. 1A.
- the temporary fixing sheet 10 shown in these figures includes a support film 1, a temporary fixing resin film 2A made of a temporary fixing resin composition, and a protective film 3 in this order.
- the support film 1 is not particularly limited, and examples thereof include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyamide, and polyimide.
- the support film 1 is preferably polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene, polyamide or polyimide from the viewpoint of excellent flexibility and toughness. Further, from the viewpoint of improving the releasability from the resin film (resin layer), it is preferable to use a film subjected to a release treatment with a silicone compound, a fluorine compound or the like as the support film.
- the thickness of the support film 1 may be appropriately changed depending on the desired flexibility, but it is preferably 3 to 350 ⁇ m. If the thickness is 3 ⁇ m or more, the film strength is sufficient, and if it is 350 ⁇ m or less, sufficient flexibility tends to be obtained. From such a viewpoint, the thickness of the support film 1 is more preferably 5 to 200 ⁇ m, further preferably 7 to 150 ⁇ m.
- the protective film 3 is not particularly limited, and examples thereof include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene and polypropylene. From the viewpoint of flexibility and toughness, the protective film 3 is preferably polyethylene terephthalate, polyethylene or polypropylene. Further, from the viewpoint of improving the releasability from the temporary fixing resin film (resin layer), it is preferable to use as the protective film 3 a film that has been subjected to a release treatment with a silicone compound, a fluorine compound or the like.
- the thickness of the protective film 3 can be appropriately set depending on the desired flexibility, and is preferably 10 to 350 ⁇ m, for example. When the thickness is 10 ⁇ m or more, the film strength becomes better, and when it is 350 ⁇ m or less, further flexibility is obtained. From such a viewpoint, the thickness of the protective film 3 is more preferably 15 to 200 ⁇ m, further preferably 20 to 150 ⁇ m.
- the temporary fixing resin film 2A can be formed by a method in which the above components are mixed and kneaded in an organic solvent to prepare a varnish, and the manufactured varnish is applied onto the support film 1 and dried.
- the organic solvent is not particularly limited, and can be determined in consideration of the volatility and the like during film formation from the boiling point. Specifically, from the viewpoint of making it difficult for the film to harden during film formation, methanol, ethanol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, methyl ethyl ketone, acetone, methyl isobutyl ketone, toluene, xylene, etc. Solvents with relatively low boiling points are preferred.
- a solvent having a relatively high boiling point such as dimethylacetamide, dimethylformamide, N-methylpyrrolidone or cyclohexanone. These solvents may be used alone or in combination of two or more.
- the solid content concentration in the varnish is preferably 10 to 80% by mass.
- Mixing and kneading can be performed by using an ordinary stirrer, a raider, a three-roller, a ball mill, or other dispersing machine, and combining them appropriately.
- the heat drying is not particularly limited as long as the solvent used is sufficiently volatilized, and can be usually heated at 60° C. to 200° C. for 0.1 to 90 minutes.
- the resin film 2A for temporary fixing is formed on the support film 1 by heating and drying. After that, the temporary fixing sheet 10 is obtained by laminating the protective film 3 so as to cover the temporary fixing resin film 2A.
- the temporary fixing sheet 10 thus obtained can be easily stored, for example, by winding it into a roll. Further, the roll-shaped temporary fixing sheet 10 can be stored in a state of being cut into a suitable size.
- FIG. 2(A) is a top view showing an embodiment of a temporary fixing sheet having two temporary fixing resin layers
- FIG. 2(B) is taken along line II-II of FIG. 2(A). It is a schematic cross section.
- the temporary fixing sheet 20 shown in these figures includes a support film 1a, a temporary fixing resin film 2B including a first resin layer 2a and a second resin layer 2b, and a supporting film 1b in this order.
- the temporary fixing resin film 2B including the first resin layer 2a and the second resin layer 2b satisfies the above-mentioned condition regarding the shear viscosity.
- the first resin layer 2a and the second resin layer 2b may be composed of the same composition or may be composed of different compositions.
- the second resin layer 2b is excellent. While having a step embedding property and an excellent peeling property with respect to a surface having a step (see FIG. 6B), a support to which the first resin layer 2a is attached prior to processing (FIG. 5A) It can be designed so as to have excellent releasability from the support 50).
- the temporary fixing resin film 2B is a laminate prepared by mixing and kneading the above components in an organic solvent to prepare a varnish, applying the varnish on the support film 1a and drying the varnish, and the same or separately. It can be formed by applying the prepared varnish on the support film 1b and drying it, and then laminating the laminate.
- the first resin layer 2a and the second resin layer 2b are formed of the same varnish, there is an advantage that the residual amount of the organic solvent can be easily sufficiently reduced even if a relatively thick temporary fixing resin film is formed.
- the first resin layer 2a and the second resin layer 2b may be integrated to have a single-layer structure, or an interface may exist between two layers to maintain a two-layer structure.
- the 90° peel strength (peeling speed: 300 mm/min) of the temporary fixing resin films 2A and 2B with respect to the support is preferably 5 to 200 N/m at 25° C., and 6 to 180 N/m. More preferably m.
- the 90° peel strength is within the above range, it is possible to sufficiently suppress the adhesive residue from being produced on the processed semiconductor wafer, and it is possible to favorably peel the processed semiconductor wafer from the support. That is, if the 90° peel strength is 5 N/m or more, the electronic component and the support can be more firmly fixed in the grinding step, and if the 90° peel strength is 200 N/m or less, the temporary fixing resin film is removed from the support. It is possible to sufficiently reduce the adhesive residue between the support and the support at the time of peeling, and further reduce the possibility that the film remains on the support.
- the 90° peel strength can be measured as follows. A 625 ⁇ m thick silicon mirror wafer (6 inches) was placed on the stage of a vacuum laminator (LM-50X50-S manufactured by NPC Co., Ltd.), and the temporary fixing resin film according to the present embodiment was used as a second layer. Is installed so that it sticks to the silicon mirror wafer side. This is heated and pressed for 2 minutes at a temperature of 120° C. and a pressure of 0.1 MPa under a condition of 15 mbar, and vacuum laminated to obtain a measurement sample. The obtained measurement sample is cured and cut into a 10 mm width. A peeling test is carried out at a speed of 300 mm/min with a peeling tester set so that the peeling angle is 90°, and the peeling strength at that time is defined as 90° peeling strength.
- FIG. 3A is a top view showing another embodiment of the temporary fixing sheet
- FIG. 3B is a schematic cross-sectional view taken along the line III-III of FIG. 3A.
- the temporary fixing sheet 30 shown in FIG. 3A is a temporary fixing sheet except that the temporary fixing resin film 2A and the protective film 3 are preliminarily cut according to the shape of a member (for example, a semiconductor wafer) to be temporarily fixed. It has the same structure as the fixing sheet 10.
- FIG. 4A is a top view showing another embodiment of the temporary fixing sheet
- FIG. 4B is a schematic cross-sectional view taken along the line IV-IV of FIG. 4A.
- the temporary fixing sheet 40 shown in FIG. 4A the support film 1b, the protective film 3 and the temporary fixing resin film 2B are preliminarily cut in accordance with the shape of a member (for example, a semiconductor wafer) to be temporarily fixed. Except for this, the sheet has the same configuration as the temporary fixing sheet 10.
- the protective film 3, the support film 1b, and the temporary fixing resin films 2A and 2B are cut in a circular shape, but they are temporarily fixed. Notches may be provided in these members according to the shapes of the members, or outer edges may be left.
- the method of processing a semiconductor wafer using the temporary fixing resin composition roughly includes the following four steps.
- the temporary fixing material temporary fixing resin layer
- FIG. 5D is a top view showing the processed semiconductor wafer.
- the temporary fixing material temporary fixing resin layer
- the temporary fixing material is a two-layer temporary fixing resin film 2B shown in FIG. 2(B) or FIG. 4(B).
- the structure of the temporary fixing material is not limited to this.
- the temporary fixing step is a step of temporarily fixing the semiconductor wafer W to the support body 50 by interposing a temporary fixing material between the support body 50 and the semiconductor wafer W (FIG. 5A).
- the thickness of the semiconductor wafer W is not particularly limited, but can be 300 to 800 ⁇ m.
- a circuit (not shown) is formed and a plurality of connection terminals Wt are formed on the surface Wa of the semiconductor wafer W on the temporary fixing resin film 2B side.
- the distance (height of the connection terminal Wt) from the surface Wa of the semiconductor wafer W to the crown of the connection terminal Wt is, for example, 1 to 200 ⁇ m, and may be 5 to 150 ⁇ m or 10 to 100 ⁇ m.
- (A-1) Formation of Temporary Fixing Material on Support 50 As shown in FIG. 5(A), when the resin film 2B for temporary fixing having a two-layer structure is used, a roll laminator and a vacuum laminator are used. As a result, a temporary fixing material can be formed on the support body 50. It should be noted that a single-layer temporary fixing resin film 2A may be used instead of the two-layer temporary fixing resin film. When the liquid temporary fixing resin composition is used, the temporary fixing material is formed on the support 50 by means such as spin coating, printing and dispensing.
- the material of the support 50 is not particularly limited, and substrates such as silicon wafers, glass wafers, quartz wafers and SUS plates can be used.
- the support 50 may be subjected to a release treatment, or the release layer 52 may be formed by performing a release treatment on all or part of the surface of the support 50 (see FIG. 5A).
- the release agent used in the release treatment is not particularly limited.
- a surface modifier having a fluorine element, a polyolefin wax and silicone oil, a silicone oil containing a reactive group, and a silicone-modified alkyd resin are excellent in release properties. Therefore, it is preferable.
- a laminate having the support 50 and the temporary fixing material formed on the surface thereof is set on a wafer bonding apparatus or a vacuum laminator.
- the semiconductor wafer W is pressed and attached to the temporary fixing material (see FIG. 5A).
- EVG's vacuum press machine EVG520IS (trade name) can be mentioned.
- EVG520IS (trade name)
- the semiconductor wafer W and the support 50 are temporarily fixed to each other with a temporary fixing material at an air pressure of 1 hPa or less, a pressure bonding pressure of 1 MPa, a pressure bonding temperature of 60° C. to 200° C., and a holding time of 100 seconds to 300 seconds. Good.
- Examples of the vacuum laminator include a vacuum laminator LM-50 ⁇ 50-S (trade name) manufactured by NPC Co., Ltd. and a vacuum laminator V130 (trade name) manufactured by Nichigo Morton Co., Ltd. Pressing conditions are atmospheric pressure of 1 hPa or less, pressure bonding temperature of 40° C. to 180° C. (preferably 60° C. to 150° C.), laminating pressure of 0.01 to 0.5 MPa (preferably 0.1 to 0.5 MPa), holding time of 1 second.
- the semiconductor wafer W and the support 50 may be temporarily fixed with a temporary fixing material in about 600 seconds (preferably 30 seconds to 300 seconds).
- the curing method is not particularly limited, and there is a method by heat or radiation irradiation.
- curing by heat is preferable.
- the curing condition is preferably 100 to 200° C. for 10 to 300 minutes (more preferably 20 to 210 minutes). If the temperature is 100° C. or higher, the temporary fixing material is sufficiently hardened so that a problem does not occur in the processing step. It can be further suppressed. Further, if the curing time is 10 minutes or longer, problems in the processing process are unlikely to occur, and if it is 300 minutes or less, work efficiency is unlikely to deteriorate.
- the temporary fixing resin film 2C in FIG. 5B is a cured product of the temporary fixing resin film 2B.
- the processing steps include grinding used at the wafer level, electrode formation, metal wiring formation, protective film formation, and the like.
- the grinding method is not particularly limited, and a known grinding method can be used. Grinding is preferably performed while water is applied to the semiconductor wafer W and the grindstone (diamond or the like) while cooling.
- the back surface Wb of the semiconductor wafer W is ground by a grinder G to reduce the thickness of, for example, about 700 ⁇ m to 100 ⁇ m or less.
- a grinder G to reduce the thickness of, for example, about 700 ⁇ m to 100 ⁇ m or less.
- An example of the grinding device is DGP-8761 (trade name) manufactured by DISCO Co., Ltd., and the cutting conditions can be arbitrarily selected according to the desired thickness of the semiconductor wafer W and the grinding state.
- metal sputtering for forming electrodes and the like
- wet etching for etching the metal sputtering layer
- resist for masking metal wiring formation
- resist formation pattern formation by exposure and development
- resist formation for resist formation
- Known processes include peeling, dry etching, metal plating formation, silicon etching for TSV formation, and oxide film formation on the silicon surface.
- FIG. 5C the back surface side of the thinned semiconductor wafer W is processed by dry ion etching, Bosch process, or the like to form through holes, and then copper plating or the like is performed to form through electrodes Et.
- FIG. 5D is a top view showing the back surface Wb side of the processed semiconductor wafer W.
- the semiconductor wafer W is diced into semiconductor elements through a dicing step of cutting along the dicing line L shown by the broken line in FIG.
- ⁇ (c) Separation step> 6A to 6D are schematic cross-sectional views showing steps subsequent to the state shown in FIG. 5C.
- the separation step is a first separation step of separating the semiconductor wafer W from the support 50 together with the temporary fixing resin film (see FIG. 6A), and a second separation step of separating the temporary fixing material from the semiconductor wafer W. (See FIG. 6B). Note that the semiconductor wafer W may be peeled from the temporary fixing resin film without performing the first peeling step.
- one of the semiconductor wafer W and the support 50 is fixed horizontally, and the other is lifted at a certain angle from the horizontal direction, and a method of attaching a protective film to a ground surface of an electronic component
- Examples include a method of peeling the component and the protective film from the support 50 by a peel method.
- the peeled semiconductor wafer W and the temporary fixing material are transferred onto the dicing tape 90 to horizontally fix the semiconductor wafer W, and
- the semiconductor wafer W from which the temporary fixing material is peeled off can be obtained by lifting the end of the fixing material at a certain angle from the horizontal direction (see FIG. 6C).
- the temporary fixing material By forming the temporary fixing material using the temporary fixing resin film according to the present embodiment, it is possible to easily obtain the processed semiconductor wafer W in which the residue such as adhesive residue is sufficiently reduced.
- These peeling methods are usually carried out at room temperature, but may be carried out at a temperature of about 40 to 100° C. that does not damage electronic components.
- a debonder (DB12T, manufactured by SUSS Microtec Co., Ltd.)
- a De-Bonding device EVG805EZD, manufactured by EVG
- the electronic component 80 is fixed horizontally, and the end of the film-shaped temporary fixing material 70 is formed at a constant angle from the horizontal direction. By lifting, the electronic component 80 from which the temporary fixing material is peeled off can be obtained, and the support can be collected.
- a part of the temporary fixing material is likely to remain on the circuit formation surface (surface Wa) of the semiconductor wafer W.
- a cleaning process can be provided to remove the temporary fixing material. The removal of the temporary fixing material can be performed, for example, by cleaning the semiconductor wafer W.
- the cleaning liquid is not particularly limited as long as it is a cleaning liquid that can remove the partially remaining temporary fixing material.
- a cleaning liquid examples include the above organic solvents that can be used for diluting the temporary fixing resin composition. These organic solvents may be used alone or in combination of two or more.
- bases and acids may be added to the organic solvent.
- bases amines such as ethanolamine, diethanolamine, triethanolamine, triethylamine, ammonia; ammonium salts such as tetramethylammonium hydroxide can be used.
- acids organic acids such as acetic acid, oxalic acid, benzenesulfonic acid and dodecylbenzenesulfonic acid can be used.
- the addition amount is preferably 0.01 to 10 mass% in terms of concentration in the cleaning liquid.
- an existing surfactant may be added to the cleaning liquid in order to improve the removability of the residue.
- the cleaning method is not particularly limited, and examples thereof include a method of performing paddle cleaning using the above cleaning solution, a cleaning method of spray spraying, and a method of immersing in a cleaning solution tank.
- the temperature is preferably 10 to 80° C., preferably 15 to 65° C.
- a thin semiconductor wafer W is obtained by washing with water or alcohol and drying.
- residues such as adhesive residue can be sufficiently reduced, so that the washing step can be omitted.
- the semiconductor wafer W on which the through electrodes Et are formed is further diced into semiconductor elements by dicing along the dicing line L (see FIG. 6D).
- the plurality of semiconductor elements 100 shown in FIG. 6D are separated from each other by the expansion of the dicing tape 90.
- FIG. 7A is a sectional view schematically showing the semiconductor element 100 manufactured through the above steps.
- FIG. 7B is a cross-sectional view schematically showing an example of an electronic device device in which a plurality of semiconductor elements 100 are stacked.
- the present invention is not necessarily limited to the above-described embodiments, and appropriate modifications may be made without departing from the spirit of the present invention.
- the resin composition for temporary fixing, the resin film for temporary fixing, the sheet for temporary fixing, and the method for manufacturing a semiconductor device according to the present invention are not limited to the processing of semiconductor wafers, and are applied to the processing of various electronic components. Then, it can be used for a method of manufacturing an electronic device.
- the transparent beads obtained by the polymerization reaction were separated by filtration, washed with deionized water, and then dried at 50° C. for 6 hours in a vacuum dryer to obtain acrylic rubber K-1.
- the acrylic rubber K-1 was measured by GPC, the weight average molecular weight of the acrylic rubber K-1 was 300,000 in terms of polystyrene.
- the Tg of acrylic rubber K-1 was -20°C.
- the transparent beads obtained by the polymerization reaction were separated by filtration, washed with deionized water, and then dried at 50° C. for 6 hours in a vacuum dryer to obtain acrylic rubber K-2.
- the acrylic rubber K-2 was measured by GPC, the weight average molecular weight of the acrylic rubber K-2 was 400,000 in terms of polystyrene.
- the Tg of acrylic rubber K-2 was -28°C.
- Examples 1 to 5, Comparative Examples 1 to 8 [Preparation of temporary fixing resin film]
- Varnishes according to Examples and Comparative Examples were prepared with the compositions of parts by mass shown in Tables 1 to 3, respectively.
- the prepared varnish is applied onto the release-treated surface of a release-treated polyethylene terephthalate film (A31, thickness: 38 ⁇ m, manufactured by Teijin Film Solutions Ltd.), and heated and dried at 90° C. for 5 minutes and 140° C. for 5 minutes.
- the first resin layer was formed.
- a second resin layer was formed using the same varnish, and a temporary fixing resin film was obtained from the first resin layer and the second resin layer.
- a protective film was attached on the temporary fixing resin film to obtain a temporary fixing resin film having the protective film and the support film.
- Acrylic rubber K-1 GPC weight average molecular weight 300,000, glycidyl methacrylate 20 mass%, Tg-20° C. acrylic rubber
- Acrylic rubber K-2 GPC weight average molecular weight 400,000, glycidyl methacrylate 10 mass%, Tg -28°C acrylic rubber
- HTR-860P-3CSP GPC weight average molecular weight 800,000, glycidyl methacrylate 3% by mass, Tg 12°C acrylic rubber (Nagase Chemtex Co., Ltd.) ⁇ YDCN-700-10: Cresol novolac type multifunctional epoxy resin (manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.)
- EXA-830CRP Bisphenol F type epoxy resin (manufactured by DIC Corporation)
- HE100-30 Phenol aralkyl resin (manufactured by Air Water Co., Ltd.)
- SH3773M Bisphenol F type epoxy resin (manufactured by
- Shear viscosity measurement The shear viscosity of the temporary fixing resin film was evaluated by the following method. Eight films adjusted to a thickness of 30 ⁇ m were laminated at 80° C. to 240 ⁇ m, and the shear viscosity was measured using a rotary viscoelasticity measuring device (TAE Instruments, Inc., ARES). The measuring method is “parallel plate”, the measuring jig is a circular jig with a diameter of 8 mm, the measuring mode is “Dynamic temperature ramp”, the frequency is 1 Hz, and the temperature rises from 35° C. to 20° C./min while applying 5% strain. The temperature was raised to 200°C at a temperature rate, and the viscosity when 120°C was reached was measured.
- Step embedding The step embedding property of the temporary fixing resin film was evaluated by the following method.
- a resin film for temporary fixing was attached to the surface of a silicon mirror wafer (6 inches) having a thickness of 625 ⁇ m by roll lamination at 80° C. to obtain a wafer with a resin film for temporary fixing.
- grooves having a width of 40 ⁇ m and a depth of 40 ⁇ m were formed at intervals of 100 ⁇ m on the surface of a 625 ⁇ m thick silicon mirror wafer (6 inches) by blade dicing.
- the resin film wafer for temporary fixing of the resin film-attached wafer was placed so that it was attached to the side of the stepped silicon mirror wafer with the resin film surface for temporary fixing facing down. This was heated and pressed at a temperature of 120° C. and a pressure of 0.1 MPa for 2 minutes under the condition of 15 mbar, and vacuum laminated. Then, the state of the temporary fixing resin film was confirmed using an ultrasonic microscope (SAM, Insight-300 manufactured by Insight Corporation).
- SAM ultrasonic microscope
- the heat resistance of the temporary fixing resin film at 250° C. was evaluated by the following method.
- a 625 ⁇ m thick silicon mirror wafer (6 inches) was cut into 25 mm square pieces by blade dicing.
- a resin film for temporary fixing was roll-laminated at 80° C. on the surface of the diced silicon mirror wafer.
- a slide glass having a thickness of 0.1 to 0.2 mm and a size of about 18 mm square is roll laminated on the temporary fixing resin film at 80° C., and the temporary fixing resin film is a silicon wafer and a slide.
- a laminate sample sandwiched between glass was prepared. The obtained sample was heated at 130° C. for 30 minutes, then at 170° C.
- the sample thus obtained was observed from the slide glass surface, the image was analyzed with a soft wafer such as Photoshop (registered trademark), and the heat resistance at 250° C. was determined from the ratio of voids to the entire area of the temporary fixing resin film.
- the sex was evaluated.
- the evaluation criteria are as follows. A: The ratio of voids is less than 5%. B: The void ratio is 5% or more.
- the cut film is set on a dynamic viscoelastic device (product name: Rheogel-E4000, manufactured by UBM Co., Ltd.), a tensile load is applied, and the measurement is performed at a frequency of 10 Hz and a heating rate of 3° C./min, and at 25° C.
- the storage elastic modulus of was measured.
- the 90° peel strength between the silicon mirror wafer and the temporary fixing resin film was evaluated by the following method. Place a 625 ⁇ m thick silicon mirror wafer (6 inches) on the stage of a vacuum laminator (LM-50X50-S, manufactured by NPC Co., Ltd.) so that the resin film for temporary fixing sticks to the silicon mirror wafer side. It was installed, heated and pressurized at a temperature of 120° C. and a pressure of 0.1 MPa for 2 minutes under the condition of 15 mbar, and vacuum laminated. The obtained sample was heated at 130° C. for 30 minutes, subsequently heated at 170° C. for 2 hours to be cured, further heated at 200° C.
- LM-50X50-S manufactured by NPC Co., Ltd.
- the measurement film was subjected to a peel test at a speed of 300 mm/min with a peel tester set so that the peel angle was 90°, and the peel strength at that time was defined as the 90° peel strength.
- the peelability of the temporary fixing resin film in a debonding device was evaluated by the following method.
- a resin film for temporary fixing was attached to a silicon mirror wafer as a support by roll lamination at 80° C. to obtain a support with a resin film for temporary fixing.
- the silicon wafer is attached so that the temporary fixing resin film of the support with the temporary fixing resin film comes into contact with the step side of the silicon wafer, and a vacuum bonding apparatus (VE07-14 manufactured by Ayumi Industry Co., Ltd.) under the condition of 5 mbar,
- the laminate was obtained by heating and pressurizing at a temperature of 120° C. and a pressure of 0.1 MPa for 2 minutes.
- the laminate thus obtained was heated at 130° C. for 30 minutes and then at 170° C. for 1 hour to cure the resin film for temporary fixing. Then, this was heated at 200° C.
- a temporary fixing resin composition that can favorably process an electronic component. Further, according to the present invention, it is possible to provide a temporary fixing resin film and a temporary fixing sheet using the temporary fixing resin composition, and a method for manufacturing a semiconductor device.
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Abstract
Description
(A)熱可塑性樹脂と、
(B)熱硬化性樹脂と、
(C)シリコーン化合物と、
を含み、120℃でのずり粘度が4000Pa・s以下であり且つ25℃の雰囲気下に7日放置した後のずり粘度の変化率が30%以内である。本発明の仮固定用樹脂組成物は(D)硬化促進剤を更に含んでもよい。
本実施形態に係る仮固定材樹脂組成物は、(A)熱可塑性樹脂と、(B)熱硬化性樹脂と、(C)シリコーン化合物とを含み、120℃でのずり粘度が4000Pa・s以下であり且つ25℃の雰囲気下に7日放置した後のずり粘度の変化率が30%以内である。この仮固定材樹脂組成物を仮固定材(仮固定用樹脂層)として使用することで、半導体ウェハを良好に加工することができ、これにより、高い生産性で電子部品を製造することができる。
ずり粘度の変化率(%)=[(25℃の雰囲気下に7日放置後における120℃でのずり粘度)-(25℃の雰囲気下に7日放置前における120℃でのずり粘度)]/(25℃の雰囲気下に7日放置前における120℃でのずり粘度)×100
なお、「25℃の雰囲気下に7日放置前における120℃でのずり粘度」は外部の環境になるべく曝されていない仮固定材樹脂組成物を試料として測定することが好ましく、例えば、調製後又は開封後から5時間以内の試料を測定することが好ましい。また、7日間にわたって放置する環境の相対湿度は55%程度であればよい。
(A)熱可塑性樹脂としては、少なくともフィルムが電子部品又は支持体にラミネートされる前において熱可塑性を有している樹脂であれば特に制限なく用いることができる。熱可塑性樹脂は、加熱等により架橋構造を形成する樹脂であってもよい。
(B)熱硬化性樹脂としては、例えば、エポキシ樹脂、アクリル樹脂、シリコーン樹脂、フェノール樹脂、熱硬化型ポリイミド樹脂、ポリウレタン樹脂、メラミン樹脂、ユリア樹脂が挙げられ、これらは、1種を単独で用いてもよく、2種類以上を組み合わせて用いてもよい。
(C)シリコーン化合物としては、ポリシロキサン構造を有するものであれば特に制限なく用いることができる。例えば、シリコーン変性樹脂、ストレートシリコーンオイル、非反応性の変性シリコーンオイル、反応性の変性シリコーンオイル等が挙げられる。シリコーン化合物は、1種を単独で又は2種類以上を組み合わせて用いることができる。
仮固定用樹脂組成物は、(D)硬化促進剤を含んでいてもよい。(D)硬化促進剤としては、例えば、イミダゾール類、ジシアンジアミド誘導体、ジカルボン酸ジヒドラジド、トリフェニルホスフィン、テトラフェニルホスホニウムテトラフェニルボレート、2-エチル-4-メチルイミダゾール-テトラフェニルボレート、1,8-ジアザビシクロ[5,4,0]ウンデセン-7-テトラフェニルボレート等が挙げられる。これらは、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
仮固定用樹脂組成物は、上記の成分以外の成分として、フィラー(無機フィラー及び/又は有機フィラー)、並びに、シランカップリング剤等を含んでもよい。
本実施形態に係る仮固定用樹脂組成物が、仮固定用樹脂フィルムである場合、フィルム状の粘着剤であるため、膜厚の制御がより容易であり、個々の電子部品間での厚さのバラツキを軽減することができる。また、本実施形態に係る仮固定用樹脂フィルムは、ラミネート等の簡便な方法により電子部品又は支持体上に貼り合わせることができ、作業性にも優れている。
図3(A)は仮固定用シートの他の実施形態を示す上面図であり、図3(B)は図3(A)のIII-III線に沿った模式断面図である。図3(A)に示す仮固定用シート30は、仮固定する部材(例えば、半導体ウェハ)の形状に合わせて仮固定用樹脂フィルム2A及び保護フィルム3が予め裁断されていること以外は、仮固定用シート10と同様の構成を有する。
仮固定用樹脂組成物を用いた半導体ウェハの加工方法は、大きく分けて以下の4工程を備える。
(a)仮固定用樹脂組成物からなる仮固定材を介して支持体に半導体ウェハを仮固定する仮固定工程。
(b)支持体に仮固定された半導体ウェハを加工する加工工程。
(c)加工後の半導体ウェハを支持体及び仮固定材から分離する分離工程。
(d)半導体ウェハに残渣がある場合、半導体ウェハを洗浄する洗浄工程。
仮固定工程は、支持体50と半導体ウェハWとの間に、仮固定材を介在させ、支持体50に対して半導体ウェハWを仮固定する工程である(図5(A))。半導体ウェハWの厚さは、特に制限はないが、300~800μmとすることができる。半導体ウェハWの仮固定用樹脂フィルム2B側の面Waには回路(不図示)が形成され且つ複数の接続端子Wtが形成されている。半導体ウェハWの面Waから接続端子Wtの頭頂部までに距離(接続端子Wtの高さ)は、例えば、1~200μmであり、5~150μm又は10~100μmであってもよい。
図5(A)に示すように、二層構成の仮固定用樹脂フィルム2Bを使用する場合、ロールラミネーター及び真空ラミネーター等を使用して支持体50上に仮固定材を形成することができる。なお、二層構成の仮固定用樹脂フィルムの代わりに、単層の仮固定用樹脂フィルム2Aを使用してもよい。液状の仮固定用樹脂組成物を使用する場合、スピンコート、印刷及びディスペンス等の手段によって、支持体50上に仮固定材を形成する。
支持体50とその表面上に形成された仮固定材とを有する積層体を、ウェハ接合装置又は真空ラミネーター上にセットする。仮固定材に対して半導体ウェハWを押圧して貼り付ける(図5(A)参照)。
支持体50に対して半導体ウェハWを仮固定した後、仮固定材の硬化を行う。硬化方法は特に制限されなく、熱又は放射線照射による方法がある。硬化方法としては、中でも、熱による硬化が好ましい。熱による硬化をする場合、硬化条件は、100~200℃で10~300分(より好ましくは20~210分)の硬化が好ましい。温度が100℃以上であれば仮固定材が充分に硬化して加工工程で問題が起きにくく、200℃以下であれば仮固定材の硬化中にアウトガスが発生しにくく、仮固定材の剥離を更に抑制できる。また、硬化時間が10分以上であれば加工工程で問題が起きにくく、300分以下であれば作業効率が悪化しにくい。図5(B)における仮固定用樹脂フィルム2Cは仮固定用樹脂フィルム2Bの硬化体を示す。
加工工程は、ウェハレベルで用いられる研削、電極形成、金属配線形成、保護膜形成等が含まれる。研削方式には特に制限はなく、公知の研削方式が利用できる。研削は半導体ウェハWと砥石(ダイヤモンド等)とに水をかけて冷却しながら行うことが好ましい。
図6(A)~図6(D)は、図5(C)に示す状態から後の工程を示す模式断面図である。分離工程は、仮固定用樹脂フィルムとともに半導体ウェハWを支持体50から剥離する第一の剥離工程と(図6(A)参照)、半導体ウェハWから仮固定材を剥離する第二の剥離工程(図6(B)参照)とを含む。なお、第一の剥離工程を実施することなく、仮固定用樹脂フィルムから半導体ウェハWを剥離してもよい。剥離方法としては、半導体ウェハW又は支持体50の一方を水平に固定しておき、他方を水平方向から一定の角度を付けて持ち上げる方法、及び、電子部品の研削面に保護フィルムを貼り、電子部品と保護フィルムとをピール方式で支持体50から剥離する方法等が挙げられる。
半導体ウェハWの回路形成面(面Wa)は仮固定材の一部が残存しやすい。半導体ウェハWの回路形成面に仮固定材が一部残存した場合、これを除去するための洗浄工程を設けることができる。仮固定材の除去は、例えば、半導体ウェハWを洗浄することにより行うことができる。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えた500ccのセパラブルフラスコ内において、以下の成分を配合した。
・脱イオン水200g
・アクリル酸ブチル60g
・メタクリル酸メチル10g
・2-ヒドロキシエチルメタクリレート10g
・グリシジルメタクリレート20g
・1.8%ポリビニルアルコール水溶液1.94g
・ラウリルパーオキサイド0.2g
・n-オクチルメルカプタン0.08g
続いて、60分間にわたってN2ガスをフラスコに吹き込んで系内の空気を除去した後、系内温度を65℃に昇温して5時間重合を行った。更に、系内温度を90℃に昇温して2時間攪拌を続け重合を完結させた。重合反応により得られた透明のビーズをろ過により分離し、脱イオン水で洗浄した後、真空乾燥機で50℃6時間乾燥させ、アクリルゴムK-1を得た。アクリルゴムK-1をGPCで測定したところ、アクリルゴムK-1の重量平均分子量はポリスチレン換算で30万であった。アクリルゴムK-1のTgは-20℃であった。
撹拌機、温度計、窒素置換装置(窒素流入管)及び水分受容器付きの還流冷却器を備えた500ccのセパラブルフラスコ内において、以下の成分を配合した。
・脱イオン水200g
・アクリル酸ブチル70g
・メタクリル酸メチル10g
・2-ヒドロキシエチルメタクリレート10g
・グリシジルメタクリレート10g
・1.8%ポリビニルアルコール水溶液1.94g
・ラウリルパーオキサイド0.2g
・n-オクチルメルカプタン0.06g
続いて、60分間にわたってN2ガスをフラスコに吹き込んで系内の空気を除去した後、系内温度を65℃に昇温して5時間重合を行った。更に、系内温度を90℃に昇温して2時間攪拌を続け重合を完結させた。重合反応により得られた透明のビーズをろ過により分離し、脱イオン水で洗浄した後、真空乾燥機で50℃6時間乾燥させ、アクリルゴムK-2を得た。アクリルゴムK-2をGPCで測定したところ、アクリルゴムK-2の重量平均分子量はポリスチレン換算で40万であった。アクリルゴムK-2のTgは-28℃であった。
[仮固定用樹脂フィルムの調製]
表1~3に示す質量部の組成で実施例及び比較例に係るワニスをそれぞれ調製した。調製したワニスを、離型処理したポリエチレンテレフタレートフィルム(帝人フィルムソリューション株式会社製、A31、厚さ38μm)の離型処理面上に塗布し、90℃で5分間、140℃で5分間加熱乾燥することによって第一樹脂層を形成した。同じワニスを用いて第二樹脂層を形成し、第一樹脂層及び第二樹脂層によって仮固定用樹脂フィルムを得た。その後、仮固定用樹脂フィルム上に保護フィルムを貼り合わせ、保護フィルム及び支持フィルムが付いた仮固定用樹脂フィルムを得た。
・アクリルゴムK-1:GPCによる重量平均分子量30万、グリシジルメタクリレート20質量%、Tg-20℃のアクリルゴム
・アクリルゴムK-2:GPCによる重量平均分子量40万、グリシジルメタクリレート10質量%、Tg-28℃のアクリルゴム
・HTR-860P-3CSP:GPCによる重量平均分子量80万、グリシジルメタクリレート3質量%、Tg12℃のアクリルゴム(ナガセケムテックス株式会社製)
・YDCN-700-10:クレゾールノボラック型多官能エポキシ樹脂(新日鉄住金化学株式会社製)
・EXA-830CRP:ビスフェノールF型エポキシ樹脂(DIC株式会社製)
・HE100-30:フェノールアラルキル樹脂(エア・ウォーター株式会社製)
・SH3773M:ポリエーテル変性シリコーン化合物(東レ・ダウコーニング株式会社製)
・TA31-209E:シリコーン変性アルキド樹脂(日立化成株式会社製)
・2PZ-CN:イミダゾール系硬化促進剤(四国化成工業株式会社製)
・2PHZ-PW:イミダゾール系硬化促進剤(四国化成工業株式会社製)
・SC2050-HLG:エポキシシラン表面処理シリカフィラ(アドマッテクス株式会社製)
仮固定用樹脂フィルムにおけるずり粘度を下記の方法により評価した。厚さ30μmに調整したフィルムを80℃で8枚ラミネートし240μmとし、回転式粘弾性測定装置(ティー・エイ・インスツルメント株式会社製、ARES)を用いて、ずり粘度を測定した。測定方法は「parall plate」、測定冶具は直径8mmの円形の治具、測定モードは「Dynamic temperature ramp」、周波数は1Hzで行い、5%の歪みを与えながら35℃から20℃/分の昇温速度で200℃まで昇温し、120℃に到達したときの粘度を測定した。
仮固定用樹脂フィルムの段差埋込性を下記の方法により評価した。厚さ625μmシリコンミラーウェハ(6インチ)表面に、仮固定用樹脂フィルムを80℃でロールラミネートにて貼り合せ、仮固定用樹脂フィルム付きウェハを得た。次に、厚さ625μmシリコンミラーウェハ(6インチ)表面に、ブレードダイシングにより幅40μm、深さ40μmの溝を100μm間隔で作製した。このようにして作製した段差付きシリコンミラーウェハの段差が上面となるように真空ラミネーター(株式会社エヌ・ピー・シー製、LM-50X50-S)のステージ上に置き、上記で作製した仮固定用樹脂フィルム付きウェハの仮固定用樹脂フィルム面を下にして、段差付きシリコンミラーウェハ側に貼り付くように設置した。これを、15mbarの条件下で、120℃の温度、0.1MPaの圧力で2分間加熱加圧し、真空ラミネートした。その後、超音波顕微鏡(SAM、インサイト株式会社製、Insight-300)を用いて仮固定用樹脂フィルムの状態を確認した。埋込性の評価基準は以下のとおりである。
A:ボイドの割合が5%未満。
B:ボイドの割合が5%以上。
仮固定用樹脂フィルムの250℃での耐熱性を下記の方法により評価した。厚さ625μmシリコンミラーウェハ(6インチ)をブレードダイシングにより25mm角に小片化した。小片化したシリコンミラーウェハ表面に、仮固定用樹脂フィルムを80℃でロールラミネートした。次に、厚さが0.1~0.2mmで大きさが約18mm角のスライドガラスを、仮固定用樹脂フィルムの上に80℃でロールラミネートし、仮固定用樹脂フィルムがシリコンウェハ及びスライドガラスで挟まれた積層体サンプルを作製した。得られたサンプルを130℃で30分間加熱し、続いて170℃で2時間加熱して仮固定用樹脂フィルムを硬化させ、その後、200℃で30分間加熱した。更にその後250℃で30分間加熱した。このようにして得られた試料をスライドガラス面から観察し、画像をPhotoshop(登録商標)等のソフトウェハで解析し、仮固定用樹脂フィルム全体の面積に占めるボイドの割合から250℃での耐熱性を評価した。評価基準は以下のとおりである。
A:ボイドの割合が5%未満。
B:ボイドの割合が5%以上。
仮固定用樹脂フィルムについて、硬化後の貯蔵弾性率を下記の方法により評価した。厚さ30μmに調整したフィルムを80℃で8枚ラミネートし240μmとし、これを130℃で30分間加熱し、続いて170℃で2時間加熱して仮固定用樹脂フィルムを硬化させ、その後200℃で30分間加熱した。その後、厚さ方向に4mm幅、長さ33mmに切り出した。切り出したフィルムを動的粘弾性装置(製品名:Rheogel-E4000、株式会社ユービーエム製)にセットし、引張り荷重をかけて、周波数10Hz、昇温速度3℃/分で測定し、25℃での貯蔵弾性率を測定した。
シリコンミラーウェハ及び仮固定用樹脂フィルムの間の90°剥離強度を下記の方法により評価した。厚さ625μmシリコンミラーウェハ(6インチ)を真空ラミネーター(株式会社エヌ・ピー・シー製、LM-50X50-S)のステージ上に置き、仮固定用樹脂フィルムがシリコンミラーウェハ側に貼り付くように設置し、15mbarの条件下で、120℃の温度、0.1MPaの圧力で2分間加熱加圧し、真空ラミネートした。得られたサンプルを130℃で30分間加熱し、続いて170℃で2時間加熱して硬化させ、これを更に200℃で30分間加熱した後、10mm幅に切り出し、測定用フィルムとした。測定用フィルムを、剥離角度が90°となるように設定した剥離試験機で300mm/分の速度で剥離試験を実施し、そのときの剥離強度を90°剥離強度とした。
仮固定用樹脂フィルムのデボンド装置での剥離性を下記の方法により評価した。支持体としてシリコンミラーウェハに仮固定用樹脂フィルムを80℃でロールラミネートにより貼り付けることで、仮固定用樹脂フィルム付き支持体を得た。次に、厚さ725μmのシリコンミラーウェハ(8インチ)表面に、ブレードダイシングにより幅40μm、深さ40μmの溝を100μm間隔で作製し、表面に段差を有するシリコンウェハを用意した。このシリコンウェハの段差側に、仮固定用樹脂フィルム付き支持体の仮固定用樹脂フィルムが接触するように貼り合わせ、真空ボンディング装置(アユミ工業株式会社製VE07-14)で5mbarの条件下で、120℃の温度、0.1MPaの圧力で2分間加熱加圧し、積層体を得た。このようにして得られた積層体を130℃で30分間加熱し、続いて170℃で1時間加熱することにより仮固定用樹脂フィルムを硬化させた。その後、これを200℃で30分間加熱した後、シリコンウェハの段差側と仮固定用樹脂フィルムとの間に、先端が鋭利なピンセットを差し入れ、外縁に沿ってピンセットを動かした。シリコンウェハ及び支持体が割れることなく剥離できたものをAとし、剥離できなかったもの又は損傷が見られたものはBとした。
Claims (14)
- フィルム状の仮固定材を介して支持体に半導体ウェハを仮固定する仮固定工程と、
前記支持体に仮固定された前記半導体ウェハを加工する加工工程と、
加工後の前記半導体ウェハを前記仮固定材から分離する分離工程と、
を含む半導体ウェハの加工方法において、前記仮固定材を形成するための仮固定用樹脂組成物であって、
(A)熱可塑性樹脂と、
(B)熱硬化性樹脂と、
(C)シリコーン化合物と、
を含み、120℃でのずり粘度が4000Pa・s以下であり且つ25℃の雰囲気下に7日放置した後のずり粘度の変化率が30%以内である、仮固定用樹脂組成物。 - 前記(B)熱硬化性樹脂の含有量が、前記(A)熱可塑性樹脂100質量部に対して、10~500質量部である、請求項1に記載の仮固定用樹脂組成物。
- 前記(B)熱硬化性樹脂がエポキシ樹脂及びフェノール樹脂の少なくとも一方を含む、請求項1又は2に記載の仮固定用樹脂組成物。
- (D)硬化促進剤を更に含む、請求項1~3のいずれか一項に記載の仮固定用樹脂組成物。
- 前記(A)熱可塑性樹脂が、反応性基を有する(メタ)アクリルモノマーを共重合成分として含む反応性基含有(メタ)アクリル共重合体である、請求項1~4のいずれか一項に記載の仮固定用樹脂組成物。
- 前記反応性基含有(メタ)アクリル共重合体が、エポキシ基を有する(メタ)アクリルモノマーを、共重合成分全量を基準として1.0~10質量%を含むエポキシ基含有(メタ)アクリル共重合体である、請求項5に記載の仮固定用樹脂組成物。
- 前記(C)シリコーン化合物が、有機基変性シリコーンである、請求項1~6のいずれか一項に記載の仮固定用樹脂組成物。
- 単層又は多層構成の仮固定用樹脂フィルムであって、
請求項1~7のいずれか一項に記載の仮固定用樹脂組成物からなる層を少なくとも一層含む、仮固定用樹脂フィルム。 - 前記仮固定用樹脂組成物からなる層を二層有する、請求項8に記載の仮固定用樹脂フィルム。
- 一つの前記仮固定用樹脂組成物からなる層と、他の前記仮固定用樹脂組成物からなる層が直接接している、請求項8又は9に記載の仮固定用樹脂フィルム。
- 支持体と半導体ウェハの間に介在し、前記支持体に対する前記半導体ウェハの仮固定に使用される、請求項8~10のいずれか一項に記載の仮固定樹脂フィルム。
- 請求項8~11のいずれか一項に記載の仮固定樹脂フィルムと、
前記仮固定樹脂フィルムの少なくとも一方の面に設けられた支持フィルムと、
を備える、仮固定用シート。 - 請求項1~7のいずれか一項に記載の仮固定用樹脂組成物を用いた半導体装置の製造方法。
- 前記仮固定用樹脂組成物からなる仮固定材を介して支持体に半導体ウェハを仮固定する仮固定工程と、
前記支持体に仮固定された前記半導体ウェハを加工する加工工程と、
加工後の前記半導体ウェハを前記仮固定材から分離する分離工程と、
を含む、請求項13に記載の半導体装置の製造方法。
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