WO2022250133A1 - 電子装置の製造方法 - Google Patents

電子装置の製造方法 Download PDF

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Publication number
WO2022250133A1
WO2022250133A1 PCT/JP2022/021691 JP2022021691W WO2022250133A1 WO 2022250133 A1 WO2022250133 A1 WO 2022250133A1 JP 2022021691 W JP2022021691 W JP 2022021691W WO 2022250133 A1 WO2022250133 A1 WO 2022250133A1
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WO
WIPO (PCT)
Prior art keywords
wafer
adhesive
electronic device
adhesive film
manufacturing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/021691
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
浩登 安井
宏嘉 栗原
仁 木下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Chemicals Tohcello Inc
Original Assignee
Mitsui Chemicals Tohcello Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsui Chemicals Tohcello Inc filed Critical Mitsui Chemicals Tohcello Inc
Priority to JP2023524245A priority Critical patent/JP7588227B2/ja
Priority to US18/564,649 priority patent/US20240266203A1/en
Priority to KR1020237042342A priority patent/KR102900554B1/ko
Priority to EP22811401.3A priority patent/EP4350744A4/en
Priority to CN202280038379.8A priority patent/CN117397008A/zh
Publication of WO2022250133A1 publication Critical patent/WO2022250133A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
    • H10P72/04—Apparatus for manufacture or treatment
    • H10P72/0442—Apparatus for placing on an insulating substrate, e.g. tape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
    • H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
    • H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
    • H10P72/7402—Wafer tapes, e.g. grinding or dicing support tapes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • 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
    • C08F2/00—Processes of polymerisation
    • C08F2/46—Polymerisation initiated by wave energy or particle radiation
    • C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
    • C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
    • 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
    • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
    • 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
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
    • C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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    • 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
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    • 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
    • C09J133/10—Homopolymers or copolymers of methacrylic acid esters
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    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P34/00—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices
    • H10P34/40—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation
    • H10P34/42—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation with electromagnetic radiation, e.g. laser annealing
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P54/00—Cutting or separating of wafers, substrates or parts of devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
    • H10P72/04—Apparatus for manufacture or treatment
    • H10P72/0428—Apparatus for mechanical treatment or grinding or cutting
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
    • H10P72/06—Apparatus for monitoring, sorting, marking, testing or measuring
    • H10P72/0604—Process monitoring, e.g. flow or thickness monitoring
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    • H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • C—CHEMISTRY; METALLURGY
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    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/22—Emulsion polymerisation
    • C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
    • C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
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    • 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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    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
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    • 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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    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
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    • C09J2301/00—Additional features of adhesives in the form of films or foils
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    • C09J2301/502—Additional features of adhesives in the form of films or foils characterized by process specific features process for debonding adherents
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    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
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    • H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
    • H10P72/7412—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support the auxiliary support including means facilitating the separation of a device or wafer from the auxiliary support
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    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
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    • H10P72/7416—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support used during dicing or grinding
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    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
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    • H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
    • H10P72/7422—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support used to protect an active side of a device or wafer
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P72/00—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof
    • H10P72/70—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping
    • H10P72/74—Handling or holding of wafers, substrates or devices during manufacture or treatment thereof for supporting or gripping using temporarily an auxiliary support
    • H10P72/744—Details of chemical or physical process used for separating the auxiliary support from a device or a wafer
    • H10P72/7442—Separation by peeling

Definitions

  • the present invention relates to a method of manufacturing an electronic device.
  • an adhesive film is sometimes attached to the circuit forming surface of the wafer in order to fix the wafer and prevent damage to the wafer.
  • an adhesive film a film obtained by laminating an adhesive resin layer on a base film is generally used.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2014-75560
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2016-72546
  • Patent Document 1 describes a surface protective sheet having a pressure-sensitive adhesive layer on a substrate, which satisfies the following requirements (a) to (d).
  • Young's modulus of the substrate is 450 MPa or more
  • Storage modulus of the adhesive layer at 25°C is 0.10 MPa or more
  • Storage modulus of the adhesive layer at 50°C is 0
  • the adhesive layer has a thickness of 30 ⁇ m or more. It is described that the infiltration of water (sludge infiltration) from the gap to the surface to be protected of the work can be suppressed, and the contamination of the surface to be protected of the work can be prevented.
  • Patent Document 2 discloses a base resin film and a radiation-curable pressure-sensitive adhesive layer formed on at least one side of the base resin film, and the base resin film has a tensile modulus of 1 to 10 GPa.
  • a protective adhesive tape is described.
  • Patent Document 2 according to such an adhesive tape for protecting the surface of a semiconductor wafer, kerf shift of singulated semiconductor chips is suppressed in the backside grinding process of a semiconductor wafer to which a pre-dicing method or a pre-stealth method is applied. It also states that the semiconductor wafer can be processed without being damaged or contaminated.
  • the grooves are usually cut with a blade, the grooves are likely to have minute chippings, which is considered to be one of the causes of adhesive residue.
  • adhesive residue is likely to occur at the chip end.
  • the present invention has been made in view of the above circumstances.
  • One of the objects of the present invention is to suppress "adhesive residue" when peeling off the adhesive film from the wafer (or singulated chips) after the back grinding process in the manufacture of electronic devices.
  • the present inventors have studied improvements from various viewpoints. As a result, the invention provided below was completed and the above problems were solved.
  • the present invention is as follows.
  • a step (A) of preparing a structure comprising a wafer having a circuit-forming surface and an adhesive film bonded to the circuit-forming surface side of the wafer; a step (B) of back-grinding the surface of the wafer opposite to the circuit-formed surface; a step (C) of irradiating the adhesive film with ultraviolet rays and then removing the adhesive film from the wafer;
  • a method for manufacturing an electronic device comprising at least The adhesive film comprises a substrate layer and an adhesive resin layer made of an ultraviolet curable adhesive resin material provided on one side of the substrate layer, In the step (C), the storage elastic modulus at 5° C.
  • a method for manufacturing the electronic device The adhesive resin layer of the adhesive film and a mirror-polished silicon wafer are bonded together, left for 1 hour, and then subjected to a peeling test under the conditions of a peeling angle of 180° and a peeling speed of 300 mm/min. Let the intensity be F0, The adhesive resin layer of the adhesive film and a mirror-polished silicon wafer are bonded together, irradiated with ultraviolet rays having a wavelength of 365 nm at 1080 mJ/cm 2 , and then peeled off at a peeling angle of 180° and a peeling speed of 300 mm/min.
  • 3. 1. or 2. A method for manufacturing the electronic device according to The method of manufacturing an electronic device, wherein the adhesive resin layer includes a (meth)acrylic resin having a polymerizable carbon-carbon double bond in a side chain and/or terminal, and a photoinitiator. 4. 1. ⁇ 3. A method for manufacturing an electronic device according to any one of The method of manufacturing an electronic device, wherein the wafer is half-cut or has a modified layer formed thereon. 5. 1. ⁇ 4.
  • a method for manufacturing an electronic device is At least one step (A1) selected from the step of half-cutting the wafer (A1-1) and the step of irradiating the wafer with a laser to form a modified layer on the wafer (A1-2); , After the step (A1), a step (A2) of attaching the adhesive film for back grinding to the circuit forming surface side of the wafer;
  • a method of manufacturing an electronic device comprising:
  • X to Y in the explanation of the numerical range means X or more and Y or less unless otherwise specified.
  • “1 to 5% by mass” means “1% by mass or more and 5% by mass or less”.
  • alkyl group includes not only alkyl groups without substituents (unsubstituted alkyl groups) but also alkyl groups with substituents (substituted alkyl groups).
  • (meth)acryl used herein represents a concept that includes both acryl and methacryl. The same applies to similar notations such as "(meth)acrylate”.
  • organic group as used herein means an atomic group obtained by removing one or more hydrogen atoms from an organic compound, unless otherwise specified.
  • a "monovalent organic group” represents an atomic group obtained by removing one hydrogen atom from an arbitrary organic compound.
  • electronic device refers to elements to which electronic engineering technology is applied, such as semiconductor chips, semiconductor elements, printed wiring boards, electric circuit display devices, information communication terminals, light-emitting diodes, physical batteries, and chemical batteries. , devices, final products, etc.
  • FIG. 1 is a cross-sectional view schematically showing an example of the structure of an adhesive film (adhesive film 50) preferably used in this embodiment.
  • Adhesive film 50 is used to protect the surface of the wafer.
  • the adhesive film 50 includes a substrate layer 10 and an ultraviolet-curable adhesive resin layer 20 (made of an ultraviolet-curable adhesive resin material) provided on one side of the substrate layer 10. configured adhesive resin layer). Specific aspects of each of these layers will be described later.
  • FIG. 2 is a cross-sectional view schematically showing an example of a method for manufacturing an electronic device using the adhesive film 50.
  • the method for manufacturing an electronic device according to this embodiment includes at least the following three steps.
  • C A step of irradiating the adhesive film 50 with ultraviolet rays and then removing the adhesive film 50 from the wafer 30.
  • the adhesive film described herein is used as the adhesive film 50.
  • the electronic device manufacturing method of the present embodiment is characterized in that the adhesive film 50 is used as a so-called back grind tape when grinding the back surface of the wafer 30 .
  • the storage elastic modulus at 5° C. of the adhesive resin layer of the adhesive film after being irradiated with ultraviolet rays, measured under the following conditions is E′.
  • storage modulus at 100° C. is E′ (100° C.)
  • E′ is 2.0 ⁇ 10 6 to 2.0 ⁇ 10 9 Pa, preferably 2.5 ⁇ 10 7 to 6.5 ⁇ 10 8 Pa
  • E′ (100° C.) is 1.0 ⁇ 10 6 to 3.0 ⁇ 10 7 Pa, preferably 3.0 ⁇ 10 6 to 2.0 ⁇ 10 7 . Pa.
  • the storage elastic modulus (E'(5°C)) at 5°C of the adhesive resin layer of the adhesive film after irradiation with ultraviolet rays is 2.0 ⁇ 10 6 Pa or more, preferably 5.0 ⁇ 10 6 .
  • Pa or more more preferably 1.0 ⁇ 10 7 Pa or more, more preferably 2.0 ⁇ 10 7 Pa or more, still more preferably 2.5 ⁇ 10 7 Pa or more, and 2.0 ⁇ 10 9 Pa or more below, it is preferably 1.0 ⁇ 10 9 Pa or less, more preferably 8.0 ⁇ 10 8 Pa or less, still more preferably 6.5 ⁇ 10 8 Pa or less, still more preferably 5.0 ⁇ 10 8 Pa or less.
  • the storage elastic modulus (E'(100°C)) at 100°C of the adhesive resin layer of the adhesive film after irradiation with ultraviolet rays is 1.0 ⁇ 10 6 Pa or more, preferably 3.0 ⁇ 10 6 Pa or more. , more preferably 4.0 ⁇ 10 6 Pa or more, more preferably 5.0 ⁇ 10 6 Pa or more, and 3.0 ⁇ 10 7 Pa or less, preferably 2.5 ⁇ 10 7 Pa or less, more It is preferably 2.0 ⁇ 10 7 Pa or less.
  • Dynamic viscoelasticity is measured in the temperature range of -50 to 200°C at a frequency of 1 Hz and in tensile mode.
  • the viscoelastic behavior in the low frequency range (that is, in the high temperature range) reflects the state of cross-linking of the cured film of the adhesive resin layer.
  • the peeling of the adhesive film after curing is usually performed at room temperature, but the storage elastic modulus at a low temperature of about 5 ° C. and the storage elastic modulus at a high temperature of about 100 ° C. are closely related to the peeling mode. It is presumed that More specifically, it is as follows.
  • E ' (5 ° C.) is too high, the toughness of the adhesive material is significantly impaired, and adhesive residue is likely to be left due to breakage of the adhesive layer. It is presumed that the adhesive residue is likely to occur because the interaction with the adherend is too large and the peeling is difficult.
  • the storage modulus at 100° C. 100° C. is a sufficiently high temperature relative to the glass transition temperature of the adhesive, and the non-crystalline adhesive is considered to be in a completely amorphous state. Therefore, E' (100°C) is considered to indicate the crosslink density of the adhesive. If E′ (100° C.) is too high, it is presumed that the toughness of the adhesive material is remarkably impaired, and the adhesive material is brittle and easily broken, resulting in adhesive residue. In addition, it is presumed that when E′ (100° C.) is too low, the interaction between the adhesive material and the adherend is high, and the peeling is difficult, resulting in adhesive residue.
  • both E' (5 ° C.) and E' (100 ° C.) are within appropriate numerical ranges, respectively, from the viewpoint of toughness at the time of peeling and cross-linking density, the performance balance of the adhesive is particularly It is thought that it means that it is good. That is, both E' (5 ° C.) and E' (100 ° C.) are produced by using an adhesive film (especially an adhesive resin layer) having appropriate values, respectively, by using the pre-dicing method. It is thought that adhesive residue is less likely to occur in the first stealth method.
  • the adhesive film 50 may be manufactured by appropriately selecting materials, composition of materials, manufacturing conditions, and the like. mentioned. Another example is to appropriately select the conditions for ultraviolet irradiation in step (C). Details of these will be discussed from time to time below.
  • Adhesive film each layer constituting the adhesive film 50 preferably used for electronic device manufacturing will be specifically described.
  • the base material layer 10 is a layer provided for the purpose of improving properties such as handleability, mechanical properties, and heat resistance of the adhesive film 50 .
  • the base material layer 10 is not particularly limited as long as it has a mechanical strength capable of withstanding the external force applied when processing the wafer, and examples thereof include a resin film.
  • Examples of the resin constituting the base material layer 10 include polyolefins such as polyethylene, polypropylene, poly(4-methyl-1-pentene) and poly(1-butene); polyester; nylon-6, nylon-66, polyamides such as polymetaxylene adipamide; (meth)acrylic resins such as polyacrylate and polymethacrylate; polyvinyl chloride; polyvinylidene chloride; polyimide; Polyacrylonitrile; polycarbonate; polystyrene; ionomer; polysulfone; polyethersulfone; polyetheretherketone; Among these, from the viewpoint of improving mechanical properties and transparency, one or two selected from the group consisting of polypropylene, polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, ethylene-vinyl acetate copolymer and polybutylene terephthalate More than one species is preferable, and one or more selected from polyethylene terephthalate and polyethylene
  • the substrate layer 10 may be a single layer or two or more layers.
  • the form of the resin film used for providing the base material layer 10 may be a stretched film or a film stretched uniaxially or biaxially. From the viewpoint of improving the mechanical strength of the base material layer 10, the film is preferably uniaxially or biaxially stretched.
  • the substrate layer 10 is preferably annealed in advance from the viewpoint of suppressing warpage of the wafer after grinding.
  • the substrate layer 10 may be subjected to surface treatment in order to improve adhesion with other layers. Specifically, corona treatment, plasma treatment, undercoat treatment, primer coat treatment, or the like may be performed.
  • the thickness of the substrate layer 10 is preferably 20 ⁇ m or more and 250 ⁇ m or less, more preferably 30 ⁇ m or more and 200 ⁇ m or less, and even more preferably 50 ⁇ m or more and 150 ⁇ m or less.
  • the adhesive film 50 includes an ultraviolet curable adhesive resin layer 20 .
  • the adhesive resin layer 20 is a layer provided on one side of the substrate layer 10, and is a layer that contacts and adheres to the circuit-forming surface of the wafer when the adhesive film 50 is attached to the circuit-forming surface of the wafer. is.
  • the adhesive resin layer 20 is formed using an appropriate UV-curable adhesive resin material. Specifically, the adhesive resin layer 20 is formed using an ultraviolet curable adhesive resin material whose adhesive strength is reduced by ultraviolet rays. When the adhesive resin layer 20 is irradiated with ultraviolet rays, it cures (cross-links, etc.) and its adhesive strength is reduced, so that the wafer (or chip obtained by dividing the wafer into pieces) can be easily peeled off from the adhesive film 50 .
  • the ultraviolet curable adhesive resin material preferably contains a (meth)acrylic resin known in the fields of pressure sensitive adhesives and adhesives.
  • (Meth)acrylic resins include, for example, homopolymers of (meth)acrylic acid ester compounds, copolymers of (meth)acrylic acid ester compounds and comonomers, and the like.
  • Examples of (meth)acrylic acid ester compounds that are raw material monomers include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxy Propyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, glycidyl (meth)acrylate and the like. These (meth)acrylic acid ester compounds may be used singly or in combination of two or more.
  • Examples of comonomers constituting the (meth)acrylic copolymer include vinyl acetate, (meth)acrylonitrile, styrene, (meth)acrylic acid, itaconic acid, (meth)acrylamide, methylol (meth)acryl amides, maleic anhydride, and the like. When these comonomers are used, they may be used singly or in combination of two or more.
  • the UV-curable adhesive resin material preferably contains a (meth)acrylic resin having a polymerizable carbon-carbon double bond at the side chain and/or terminal, and a photoinitiator, and is further crosslinked as necessary. Including drugs, etc.
  • the UV-curable adhesive resin material may further contain a low-molecular-weight compound (polyfunctional (meth)acrylate compound, etc.) having two or more polymerizable carbon-carbon double bonds in one molecule.
  • a (meth)acrylic resin having a polymerizable carbon-carbon double bond in a side chain and/or terminal is specifically obtained as follows. First, a monomer having an ethylenic double bond and a copolymerizable monomer having a functional group (P) are copolymerized. Next, a functional group (P) contained in this copolymer and a monomer having a functional group (Q) capable of undergoing addition reaction, condensation reaction, etc. with the functional group (P) are combined with each other, leaving the double bond in the monomer A polymerizable carbon-carbon double bond is introduced into the copolymer molecule by reacting in situ.
  • Examples of monomers having an ethylenic double bond include alkyl acrylates such as methyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, butyl (meth)acrylate, and ethyl (meth)acrylate, and One or two or more of methacrylic acid alkyl ester monomers, vinyl esters such as vinyl acetate, (meth)acrylonitrile, (meth)acrylamide, and monomers having an ethylenic double bond such as styrene are used.
  • alkyl acrylates such as methyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, butyl (meth)acrylate, and ethyl (meth)acrylate
  • methacrylic acid alkyl ester monomers vinyl esters such as vinyl acetate, (meth)acrylonitrile, (meth)acrylamide
  • monomers having an ethylenic double bond such as
  • copolymerizable monomers having a functional group (P) examples include (meth)acrylic acid, maleic acid, 2-hydroxyethyl (meth)acrylate, glycidyl (meth)acrylate, N-methylol (meth)acrylamide, (meth) acryloyloxyethyl isocyanate and the like. These may be used alone or in combination of two or more.
  • the ratio of the monomer having an ethylenic double bond and the copolymerizable monomer having a functional group (P) is 70 to 99% by mass of the monomer having an ethylenic double bond, and the copolymer having a functional group (P) preferably 1 to 30% by mass of the reactive monomer.
  • the monomer having an ethylenic double bond accounts for 80 to 95% by mass
  • the copolymerizable monomer having a functional group (P) accounts for 5 to 20% by mass.
  • the monomer having the functional group (Q) include monomers similar to the copolymerizable monomer having the functional group (P).
  • a combination such as a carboxyl group and an epoxy group, a carboxyl group and an aziridinyl group, a hydroxyl group and an isocyanate group, etc., in which an addition reaction easily occurs is desirable.
  • any reaction such as a condensation reaction between a carboxylic acid group and a hydroxyl group can be applied as long as the reaction can easily introduce a polymerizable carbon-carbon double bond.
  • a polymerization initiator can be used when copolymerizing a monomer having an ethylenic double bond and a copolymerizable monomer having a functional group (P).
  • examples of polymerization initiators include radical polymerization initiators such as benzoyl peroxide-based polymerization initiators and t-butylperoxy-2-ethylhexanoate.
  • Low molecular weight compounds having two or more polymerizable carbon-carbon double bonds in one molecule include, for example, tripropylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tetraacrylate, penta Polyfunctional (meth)acrylate compounds such as erythritol tetra(meth)acrylate, dipentaerythritol monohydroxypenta(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, ditrimethylolpropane tetraacrylate, etc. etc.
  • the amount of the low molecular weight compound having two or more polymerizable carbon-carbon double bonds in the molecule is preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the (meth)acrylic resin, More preferably, it is 5 to 18 parts by mass. In addition, the amount of the low-molecular-weight compound having two or more polymerizable carbon-carbon double bonds in the molecule is preferably 0.1 parts by mass or more, with respect to 100 parts by mass of the (meth)acrylic resin.
  • a photoinitiator usually generates chemical species (such as radicals) that polymerize polymerizable carbon-carbon double bonds when irradiated with ultraviolet rays.
  • photoinitiators include benzoin, isopropylbenzoin ether, isobutylbenzoin ether, benzophenone, Michler ketone, chlorothioxanthone, dodecylthioxanthone, dimethylthioxanthone, diethylthioxanthone, acetophenone diethyl ketal, benzyl dimethyl ketal, 1-hydroxycyclohexylphenyl ketone, 2 -hydroxy-2-methyl-1-phenylpropan-1-one, 2-benzyl-2-dimethylamino-4'-morpholinobutyrophenone, 2,2-dimethoxy-2-phenylacetophenone, 2-dimethylamino-2- (4-methylbenzyl)-1-(4-morpholin-4-yl-phenyl
  • a photoinitiator may use only 1 type and may use 2 or more types.
  • the amount of the photoinitiator added is preferably 0.1 to 15 parts by mass, more preferably 1 to 10 parts by mass, and still more preferably 4 to 100 parts by mass of the (meth)acrylic resin. 10 parts by mass.
  • the amount of the photoinitiator added is preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, still more preferably 3 parts by mass or more, and further preferably 100 parts by mass of the (meth)acrylic resin.
  • It is preferably 4 parts by mass or more, more preferably 5 parts by mass or more, and is preferably 15 parts by mass or less, more preferably 12 parts by mass or less, still more preferably 10 parts by mass or less, further preferably 8 parts by mass or less. be.
  • the ultraviolet curable adhesive resin material may contain a cross-linking agent.
  • cross-linking agents include epoxy compounds such as sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, tetramethylolmethane-tri- ⁇ -aziridinylpropionate, trimethylolpropane-tri- ⁇ -aziridinylpropionate, N,N'-diphenylmethane-4,4'-bis(1-aziridinecarboxamide), N,N'-hexamethylene-1,6-bis( 1-aziridine carboxamide), isocyanate compounds such as tetramethylene diisocyanate, hexamethylene diisocyanate and polyisocyanate. Only one type of cross-linking agent may be used, or two or more types may be used.
  • the amount of the cross-linking agent in the UV-curable adhesive resin material is 100 mass of (meth)acrylic resin from the viewpoint of improving the balance between the heat resistance and adhesion of the adhesive resin layer 20. It is preferably 0.1 to 15 parts by mass, more preferably 0.5 to 5 parts by mass.
  • the content of the cross-linking agent in the ultraviolet-curable adhesive resin material is, from the viewpoint of improving the balance between the heat resistance and adhesion of the adhesive resin layer 20, the (meth)acrylic resin With respect to 100 parts by mass, preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, still more preferably 0.5 parts by mass or more, still more preferably 0.7 parts by mass or more, and preferably is 15 parts by mass or less, more preferably 10 parts by mass or less, even more preferably 5 parts by mass or less, and even more preferably 3 parts by mass or less.
  • the adhesive resin layer 20 can be formed, for example, by applying an ultraviolet curable adhesive resin material on one surface of the base material layer 10 . That is, an ultraviolet curable adhesive resin material prepared by dissolving or dispersing each of the above components in an appropriate solvent (typically an organic solvent) is coated on one surface of the base material layer 10 to form an adhesive layer.
  • a flexible resin layer 20 may be provided.
  • the coating method conventionally known coating methods such as roll coater method, reverse roll coater method, gravure roll method, bar coater method, comma coater method and die coater method can be employed.
  • the drying conditions are not particularly limited, it is generally preferable to dry in a temperature range of 80 to 200° C. for 10 seconds to 10 minutes.
  • the pressure-sensitive adhesive coating solution may be heated at 40-80° C. for about 5-300 hours after drying.
  • the UV-curable adhesive resin material is applied to the surface of an easily peelable base material (separator) to form an adhesive resin layer 20, and (ii) thereafter, the formed adhesive resin layer is attached to one surface of the base material layer 10.
  • the UV-curable adhesive resin material is applied to the surface of an easily peelable base material (separator) to form an adhesive resin layer 20
  • the formed adhesive resin layer is attached to one surface of the base material layer 10.
  • a method can also be mentioned.
  • the thickness of the adhesive resin layer 20 is preferably 5 ⁇ m or more and 300 ⁇ m or less, more preferably 10 ⁇ m or more and 100 ⁇ m or less, and still more preferably 10 ⁇ m or more and 50 ⁇ m or less. Sufficient adhesiveness can be obtained by appropriately increasing the thickness of the adhesive resin layer 20 . In addition, since the adhesive resin layer 20 is not too thick, the handleability of the adhesive film 50 is improved.
  • the thickness of the adhesive resin layer 20 is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, still more preferably 20 ⁇ m or more, and preferably 300 ⁇ m or less, more preferably 100 ⁇ m or less, and still more preferably 50 ⁇ m or less.
  • the adhesive film 50 may include other layers as long as the effect of suppressing adhesive residue is not impaired.
  • there may be another layer such as an uneven absorbent resin layer, an adhesive layer, or an antistatic layer between each layer.
  • an uneven absorbent resin layer By providing the unevenness-absorbing resin layer, the ability of the adhesive film 50 to absorb unevenness can be improved.
  • the adhesive layer By providing the adhesive layer, the adhesion between each layer can be improved.
  • the antistatic property of the adhesive film 50 can be improved by providing an antistatic layer.
  • the exposed surface of the adhesive resin layer 20 may be protected with an appropriate protective film (easy peeling film) such as a release film.
  • the thickness of the entire adhesive film 50 is preferably 50 ⁇ m or more and 600 ⁇ m or less, more preferably 50 ⁇ m or more and 400 ⁇ m or less, and still more preferably 50 ⁇ m or more and 300 ⁇ m or less, from the balance of mechanical properties and handleability.
  • the adhesive resin layer 20 is formed using an ultraviolet curable adhesive resin material whose adhesive strength is reduced by ultraviolet rays.
  • the extent to which the adhesive strength is reduced by ultraviolet rays is preferably quantified as follows.
  • F1/F0 is preferably 0.01 to 0.60, more preferably 0.01 to 0.20, and still more preferably 0.02 to 0.20.
  • F1/F0 is preferably 0.01 or more, more preferably 0.015 or more, more preferably 0.02 or more, and preferably 0.60 or less, more preferably 0.30 or less, and further It is preferably 0.20 or less, more preferably 0.15 or less, further preferably 0.12 or less.
  • F1/F0 By setting F1/F0 to an appropriate value, displacement of the wafer during the backgrinding process can be suppressed, and the adhesive film 50 can be easily peeled off after the backgrinding process.
  • the value of F0 itself is, for example, 3 to 20N/25mm, specifically 3 to 16N/25mm.
  • the value of F1 itself is, for example, 10 N/25 mm or less, specifically 1 N/25 mm or less, more specifically 0.5 N/25 mm or less.
  • F1 may be zero, F1 is generally 0.005 N/25 mm or more, specifically 0.01 N/25 mm or more.
  • FIG. 2 is a cross-sectional view schematically showing an example of a method for manufacturing an electronic device using the adhesive film 50 .
  • a method of manufacturing an electronic device generally includes at least the following three steps.
  • (A) Step of preparing structure 100 comprising wafer 30 having circuit-forming surface 30A and adhesive film 50 bonded to circuit-forming surface 30A side of wafer 30 (B) Circuit-forming surface 30A of wafer 30 Step (C) Step of back-grinding the surface opposite to the side (C) Step of removing the adhesive film 50 from the wafer 30 after irradiating the adhesive film 50 with ultraviolet rays
  • the adhesive film As 50 the adhesive film described in the section "1.
  • Adhesive film is used.
  • the electronic device manufacturing method of the present embodiment is characterized in that the adhesive film 50 is used as a so-called back grind tape when grinding the back surface of the wafer 30 .
  • Each step of the method for manufacturing an electronic device will be described below.
  • Step (A) First, a structure 100 including a wafer 30 having a circuit forming surface 30A and an adhesive film 50 bonded to the circuit forming surface 30A side of the wafer 30 is prepared.
  • a structure 100 is produced, for example, by peeling off the release film from the adhesive resin layer 20 of the adhesive film 50 to expose the surface of the adhesive resin layer 20, and then placing the wafer 30 on the adhesive resin layer 20. can be produced by adhering the circuit forming surface 30A.
  • the conditions for attaching the circuit forming surface 30A of the wafer 30 to the adhesive film 50 are not particularly limited. It can be 0.5 to 20 mm/sec.
  • the step (A) includes at least one selected from a step (A1-1) of half-cutting the wafer 30 and a step (A1-2) of irradiating the wafer 30 with a laser to form a modified layer on the wafer 30. and a step (A2) of attaching the adhesive film 50 for back grinding to the circuit forming surface 30A side of the wafer 30 after the step (A1).
  • the adhesive film 50 can be suitably used in the electronic device manufacturing process using the pre-dicing method, the pre-stealth method, or the like. Therefore, a manufacturing method in which the above step (A1-1) as a pre-dicing method or the above step (A1-2) as a pre-stealth method is performed is preferable.
  • step (A2) the adhesive film 50 can be heated and attached to the circuit forming surface 30A of the wafer 30.
  • the heating temperature is not particularly limited, it is, for example, 60 to 80.degree.
  • the operation of attaching the adhesive film 50 to the wafer 30 may be performed manually, but in general, it can be performed by a device called an automatic attaching machine equipped with a roll-shaped adhesive film.
  • the wafer 30 to be attached to the adhesive film 50 is not particularly limited, but the wafer 30 having the circuit forming surface 30A is preferable.
  • Examples include semiconductor wafers, epoxy mold wafers, epoxy mold panels, etc., preferably semiconductor wafers and epoxy mold wafers.
  • semiconductor wafers include silicon wafers, sapphire wafers, germanium wafers, germanium-arsenic wafers, gallium-phosphorus wafers, gallium-arsenic-aluminum wafers, gallium-arsenic wafers, lithium tantalate wafers, and silicon wafers.
  • Epoxy mold wafers include wafers manufactured by an eWLB (Embedded Wafer Level Ball Grid Array) process, which is one of the methods for manufacturing fan-out WLPs.
  • the semiconductor wafer and epoxy mold wafer having a circuit forming surface are not particularly limited, and examples thereof include those on which circuits such as wiring, capacitors, diodes or transistors are formed. Also, the circuit forming surface may be plasma-treated.
  • the circuit formation surface 30A of the wafer 30 may be an uneven surface by having, for example, bump electrodes or the like.
  • the bump electrode is joined to an electrode formed on the mounting surface to provide an electrical connection between the electronic device and the mounting surface (a mounting surface such as a printed circuit board). It forms a connection.
  • Examples of bump electrodes include ball bumps, printed bumps, stud bumps, plated bumps, pillar bumps, and the like. That is, the bump electrodes are usually convex electrodes. These bump electrodes may be used singly or in combination of two or more.
  • the height and diameter of the bump electrode are not particularly limited, they are preferably 10 to 400 ⁇ m, more preferably 50 to 300 ⁇ m, respectively.
  • the bump pitch at that time is not particularly limited, it is preferably 20 to 600 ⁇ m, more preferably 100 to 500 ⁇ m.
  • the type of metal forming the bump electrode is not particularly limited, and examples thereof include solder, silver, gold, copper, tin, lead, bismuth, and alloys thereof. It is preferably used for These metal species may be used singly or in combination of two or more.
  • Step (B) the surface of the wafer 30 opposite to the circuit forming surface 30A (also referred to as the back surface) is back ground.
  • “Backgrinding” means thinning the wafer 30 to a predetermined thickness without damaging it.
  • the structure 100 is fixed to a chuck table or the like of a grinding machine, and the back surface (circuit non-formed surface) of the wafer 30 is ground.
  • the wafer 30 is ground until the thickness is less than or equal to the desired thickness.
  • the thickness of the wafer 30 before grinding is appropriately determined according to the diameter and type of the wafer 30, and the thickness of the wafer 30 after grinding is determined appropriately according to the size of chips to be obtained, the type of circuit, and the like. Further, when the wafer 30 is half-cut or a modified layer is formed by laser irradiation, the wafer 30 is singulated into chips 31 by the step (B) as shown in FIG. .
  • the back surface grinding method is not particularly limited, and a known grinding method can be adopted. Grinding can be performed while cooling the wafer 30 and the whetstone with water. If necessary, a dry polishing process, which is a grinding method that does not use grinding water, can be performed at the end of the grinding process. After finishing the back surface grinding, chemical etching is performed as necessary. Chemical etching is performed by using an etchant selected from the group consisting of an acidic aqueous solution consisting of hydrofluoric acid, nitric acid, sulfuric acid, acetic acid, etc. alone or a mixed solution, an alkaline aqueous solution such as a potassium hydroxide aqueous solution, a sodium hydroxide aqueous solution, etc.
  • an etchant selected from the group consisting of an acidic aqueous solution consisting of hydrofluoric acid, nitric acid, sulfuric acid, acetic acid, etc. alone or a mixed solution, an alkaline aqueous solution such as
  • the wafer 30 is immersed with the adhesive film 50 adhered thereon. Etching is performed for the purpose of removing strain generated on the back surface of the wafer 30, further thinning the wafer 30, removing oxide films and the like, pretreatment when electrodes are formed on the back surface, and the like.
  • the etchant is appropriately selected according to the above purposes.
  • Step (C) Next, the adhesive film 50 is removed from the wafer 30 after the adhesive film 50 is irradiated with ultraviolet rays.
  • the adhesive film 50 is irradiated with ultraviolet rays at a dose of, for example, 200 mJ/cm 2 or more and 2000 mJ/cm 2 or less, thereby curing the adhesive resin layer 20 with ultraviolet rays and forming the adhesive resin layer 20. and then remove the adhesive film 50 from the wafer 30 .
  • Ultraviolet irradiation can be performed using, for example, ultraviolet rays with a dominant wavelength of 365 nm using a high-pressure mercury lamp.
  • the irradiation intensity of ultraviolet rays is, for example, 50 mW/cm 2 or more and 500 mW/cm 2 or less.
  • the wafer 30 Before removing the adhesive film from the wafer 30, the wafer 30 may be mounted on a dicing tape or a dicing tape with a die attach film together with the ring frame.
  • the operation of removing the adhesive film 50 from the wafer 30 may be performed manually, but generally can be performed by a device called an automatic peeler.
  • the surface of the wafer 30 after peeling off the adhesive film 50 may be cleaned if necessary.
  • the cleaning method include wet cleaning such as water cleaning and solvent cleaning, and dry cleaning such as plasma cleaning. In the case of wet cleaning, ultrasonic cleaning may be used together.
  • the cleaning method can be appropriately selected depending on the contamination status of the surface of the wafer 30 .
  • a step of mounting the obtained chip 31 on a circuit board may be further performed. These steps can be performed based on publicly known information.
  • Base material layer 1 polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., product name: E7180, thickness: 50 ⁇ m, single-sided corona-treated product)
  • Base layer 2 Laminated film (total thickness: 110 ⁇ m) composed of low-density polyethylene film/polyethylene terephthalate film/low-density polyethylene film produced as follows. It was obtained by laminating a low-density polyethylene film (density: 0.925 kg/m 3 , thickness: 30 ⁇ m) on both sides of a polyethylene terephthalate film (manufactured by Toray Industries, product name: Lumirror S10, thickness: 50 ⁇ m). One side of the obtained laminated film was subjected to corona treatment.
  • Base layer 3 Laminated film (total thickness: 145 ⁇ m) composed of polyethylene terephthalate film/ethylene-vinyl acetate copolymer film/acrylic film produced as follows. Polyethylene terephthalate film (manufactured by Toyobo, product name: E7180, thickness: 50 ⁇ m) and ethylene-vinyl acetate copolymer (manufactured by Mitsui-Dow Polychemicals, MFR: 2.5 g/10 min) film (thickness: 70 ⁇ m) was laminated by performing corona treatment on the side of the ethylene/vinyl acetate copolymer film to be bonded to the polyethylene terephthalate film.
  • Polyethylene terephthalate film manufactured by Toyobo, product name: E7180, thickness: 50 ⁇ m
  • ethylene-vinyl acetate copolymer manufactured by Mitsui-Dow Polychemicals, MFR: 2.5 g/10 min
  • the side of the ethylene-vinyl acetate copolymer film opposite to the polyethylene terephthalate film was also subjected to corona discharge treatment.
  • the release surface of the release-treated polyethylene terephthalate film (separator) is coated with the acrylic resin coating solution for the base material layer shown below so as to have a dry thickness of 20 ⁇ m and dried.
  • a laminated film composed of film/ethylene-vinyl acetate copolymer film was laminated with the ethylene-vinyl acetate copolymer film interposed therebetween, and aged (40° C., 3 days). After that, the separator was peeled off.
  • a substrate layer 3 was obtained as described above.
  • (Meth)acrylic resin solution) (Meth) acrylic resin solution 1: 49 parts by mass of ethyl acrylate, 20 parts by mass of 2-ethylhexyl acrylate, 21 parts by mass of methyl acrylate, 10 parts by mass of glycidyl methacrylate, and 0.5 parts by mass of a benzoyl peroxide polymerization initiator as a polymerization initiator (solid in terms of minutes) was reacted in a mixed solvent of 65 parts by mass of toluene and 50 parts by mass of ethyl acetate at 80° C. for 10 hours.
  • (Meth) acrylic resin solution 2 77 parts by mass of n-butyl acrylate, 16 parts by mass of methyl methacrylate, 16 parts by mass of 2-hydroxyethyl acrylate, and 0.3 parts by mass of t-butyl peroxy-2-ethylhexanoate as a polymerization initiator, The mixture was reacted at 85° C. for 10 hours in a mixed solvent of 20 parts by mass of toluene and 80 parts by mass of ethyl acetate.
  • (Meth) acrylic resin solution 3 30 parts by mass of ethyl acrylate, 11 parts by mass of methyl acrylate, 26 parts by mass of 2-ethylhexyl acrylate, 7 parts by mass of 2-hydroxyethyl methacrylate, and 0.8 parts by mass of a benzoyl peroxide polymerization initiator as a polymerization initiator parts (in terms of solid content) were reacted in a mixed solvent of 7 parts by mass of toluene and 50 parts by mass of ethyl acetate at 80° C. for 9 hours. After completion of the reaction, the obtained solution was cooled, and 25 parts by mass of toluene was added to the cooled solution. As described above, a (meth)acrylic resin solution 3 was obtained.
  • crosslinking agent Isocyanate-based cross-linking agent (manufactured by Mitsui Chemicals, trade name: Orester P49-75S)
  • UV-curable adhesive resin material coating liquid for forming adhesive resin layer
  • Each material described in the column of "UV-curable adhesive resin material (coating solution for forming adhesive resin layer)" in Table 1 is uniformly mixed to obtain an ultraviolet-curable adhesive resin material (adhesive resin layer forming). was obtained.
  • the UV-curable adhesive resin material (coating solution for forming an adhesive resin layer) shown in Table 1 was applied to a polyethylene terephthalate film (separator) that had been subjected to a silicone release treatment. Then, it was dried at 120° C. for 3 minutes to form an adhesive resin layer having a thickness of 20 ⁇ m.
  • the formed adhesive resin layer was attached to the substrate layer to form a laminate. Specifically, when the substrate layer 1 or 2 was used as the substrate layer, it was attached to the corona-treated surface. When the base material layer 3 was used as the base material layer, the separator was peeled off and attached to the acrylic film layer side. The resulting laminate was heated in an oven at 40° C. for 3 days for aging. As described above, an adhesive film for back grinding was obtained.
  • Adhesive strength evaluation Measurement of adhesive strength before and after UV irradiation
  • i Preparation of adherend wafer for adhesive strength measurement: The mirror surface of a silicon mirror wafer (4-inch single-sided mirror wafer manufactured by SUMCO) was cleaned with ozone using a UV ozone cleaning device (UV-208 manufactured by Technovision) (ozone treatment time: 60 seconds). Thereafter, the mirror surface of the wafer was wiped off with ethanol to obtain an adherend wafer.
  • UV ozone cleaning device UV-208 manufactured by Technovision
  • Evaluation wafer 1 Using a dicing saw, the mirror surface of a mirror wafer (KST World, 8-inch mirror wafer, diameter: 200 ⁇ 0.5 mm, thickness: 725 ⁇ 50 ⁇ m, single-sided mirror) is half-cut and evaluated. Wafer 1 was obtained. (Blade: ZH05-SD3500-N1-70-DD, chip size: 5 mm ⁇ 8 mm, depth of cut: 58 ⁇ m, blade rotation speed: 30000 rpm). When the evaluation wafer 1 was observed with an optical microscope, the kerf width was 35 ⁇ m.
  • Evaluation wafer 2 Using a dicing saw, the mirror surface of a mirror wafer (KST World, 8-inch mirror wafer, diameter: 200 ⁇ 0.5 mm, thickness: 725 ⁇ 50 ⁇ m, single-sided mirror). Cutting was performed (blade: Z09-SD2000-Y1 58 ⁇ 0.25A ⁇ 40 ⁇ 45E-L, chip size: 5 mm ⁇ 8 mm, depth of cut: 15 ⁇ m, blade rotation speed: 30000 rpm). Observation with an optical microscope revealed that the kerf width was 60 ⁇ m.
  • a second-stage half-cut is performed (blade: ZH05-SD3500-N1-70-DD, chip size: 5 mm ⁇ 8 mm, cutting depth: 58 ⁇ m, blade rotation speed: 30000 rpm) to obtain evaluation wafer 2. rice field.
  • the adhesive film was irradiated with ultraviolet rays having a dominant wavelength of 365 nm at an irradiation intensity of 100 mW/cm 2 using a high-pressure mercury lamp in an environment of 25° C. with an ultraviolet dose of 1080 mJ/cm 2 . .
  • the peeling of the adhesive film was performed by the following procedures.
  • a separately prepared dicing tape (used as a mounting tape) is applied to the 8-inch wafer ring frame and the above-mentioned individual via the adhesive surface of the dicing tape. It was pasted on the wafer side of the separated wafer.
  • a tape peeler HR3000III, manufactured by Nitto Denko
  • the adhesive film for pre-dicing evaluation was peeled off from the wafer notch portion with a peeling tape (PET38REL, manufactured by Lasting System). Then, device peelability was evaluated.
  • “OK” indicates that the pre-dicing evaluation adhesive film could be peeled off from the wafer at one time.
  • the viscoelastic properties of the adhesive resin layer in the adhesive film after UV irradiation were measured using a measurement sample that was cut from the adhesive film after UV irradiation under the above conditions to a width of 10 mm and a length of 50 mm. Specifically, using a solid viscoelasticity measuring device (RSA3, manufactured by TA Instruments), a measurement sample was set in the device so that the chuck distance was 20 mm, and the frequency was 1 Hz, the tension mode, and the temperature - It was measured in the range of 50 to 200°C. Then, the storage elastic modulus E' at 5°C (5°C) and the storage elastic modulus E' at 100°C (100°C) were determined.
  • RSA3 solid viscoelasticity measuring device

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Optics & Photonics (AREA)
  • Dicing (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Laser Beam Processing (AREA)
  • Adhesive Tapes (AREA)
PCT/JP2022/021691 2021-05-28 2022-05-27 電子装置の製造方法 Ceased WO2022250133A1 (ja)

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JP2023524245A JP7588227B2 (ja) 2021-05-28 2022-05-27 電子装置の製造方法
US18/564,649 US20240266203A1 (en) 2021-05-28 2022-05-27 Method for manufacturing electronic device
KR1020237042342A KR102900554B1 (ko) 2021-05-28 2022-05-27 전자 장치의 제조 방법
EP22811401.3A EP4350744A4 (en) 2021-05-28 2022-05-27 METHOD FOR MANUFACTURING AN ELECTRONIC DEVICE
CN202280038379.8A CN117397008A (zh) 2021-05-28 2022-05-27 电子装置的制造方法

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EP4350744A4 (en) 2025-06-25
KR102900554B1 (ko) 2025-12-16
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