WO2019124417A1 - シリコーン系接着シート、それを含む積層体、半導体装置の製造方法 - Google Patents
シリコーン系接着シート、それを含む積層体、半導体装置の製造方法 Download PDFInfo
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- WO2019124417A1 WO2019124417A1 PCT/JP2018/046702 JP2018046702W WO2019124417A1 WO 2019124417 A1 WO2019124417 A1 WO 2019124417A1 JP 2018046702 W JP2018046702 W JP 2018046702W WO 2019124417 A1 WO2019124417 A1 WO 2019124417A1
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- silicone
- adhesive sheet
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- based adhesive
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- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/286—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysulphones; polysulfides
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- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C3/00—Assembling of devices or systems from individually processed components
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- B81C3/00—Assembling of devices or systems from individually processed components
- B81C3/001—Bonding of two components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- 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
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
-
- 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
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
-
- 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
- C09J7/35—Heat-activated
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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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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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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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/14—Semiconductor wafers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81C—PROCESSES OR APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OR TREATMENT OF MICROSTRUCTURAL DEVICES OR SYSTEMS
- B81C2201/00—Manufacture or treatment of microstructural devices or systems
- B81C2201/01—Manufacture or treatment of microstructural devices or systems in or on a substrate
- B81C2201/0174—Manufacture or treatment of microstructural devices or systems in or on a substrate for making multi-layered devices, film deposition or growing
- B81C2201/019—Bonding or gluing multiple substrate layers
-
- 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
-
- 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
- C09J2301/304—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 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
-
- 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
-
- 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
- C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
- 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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- 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
- C09J2483/00—Presence of polysiloxane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- 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
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/831—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector the layer connector being supplied to the parts to be connected in the bonding apparatus
- H01L2224/83101—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector the layer connector being supplied to the parts to be connected in the bonding apparatus as prepeg comprising a layer connector, e.g. provided in an insulating plate member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/146—Mixed devices
- H01L2924/1461—MEMS
Definitions
- the surface is slightly tacky, it is possible to easily temporarily fix a diced semiconductor chip or the like on a semiconductor substrate, and silicone which exhibits permanent adhesion to an adherend by post curing.
- the present invention relates to a system adhesive sheet, a laminate including the same, and a method of manufacturing a semiconductor device (particularly, including a MEMS device) using the same.
- a semiconductor wafer such as silicon is processed by forming a plurality of electronic circuits on its surface, polishing the back surface of the semiconductor wafer on which the electronic circuits are formed, and cutting (dicing) the semiconductor wafer fixed to a base film.
- a semiconductor device is obtained through a process of dividing into IC chips having individual electronic circuits, a process of fixing the IC chips to a die pad (die bonding), and a process of optionally resin-sealing the chips.
- the step of fixing an IC chip obtained by cutting a semiconductor wafer to a die pad the chip is fixed to the die pad (mounting portion) via an adhesive.
- the adhesive When the adhesive is liquid, the adhesive is dropped and applied to the surface of the chip mounting portion or the chip itself, but it is difficult to accurately control the amount of adhesive when such a liquid adhesive is dropped. If the chip is small, the adhesive may stick out of the chip, and if the chip is large, the adhesive may run short, so a dry type sheet adhesive with a uniform thickness may be used in advance. Methods for securing the chip to the die pad have been implemented.
- the present applicant has proposed the thing of patent document 1 and patent document 2 as a silicone type adhesive sheet.
- seat for dicing die bonding of patent document 3 is proposed for the purpose of the improvement of the manufacturing effort and cost of a semiconductor device.
- These silicone adhesive sheets are suitable for the purpose of bonding (permanently bonding for the purpose of fixing) the semiconductor chip or the semiconductor wafer to the mounting portion by heating, and in the dicing step prior to the die bonding step,
- the adhesive layer can be supplied in advance to the surface of the semiconductor wafer at the stage of fixing the wafer on the base film, and a chip having an adhesive layer precisely corresponding to the shape of the chip surface can be formed. And the production efficiency of the semiconductor device.
- MEMS devices such as compact and highly integrated sensors are in widespread use by using micro electro mechanical systems (MEMS) technology, and the semiconductor package is miniaturized as compared with the prior art.
- MEMS micro electro mechanical systems
- the die pad is generated by the vibration generated during the die bonding process after the semiconductor chip provided with the adhesive sheet layer is disposed on the die pad. Misalignment of the semiconductor chip at the top may occur.
- a MEMS device since a large number of semiconductor chips are sequentially arranged in the same package, it is difficult to completely suppress such vibration, and confirmation and readjustment of arrangement after chip arrangement, etc. There is a problem that the yield and the production efficiency decrease.
- An object of the present invention is to provide a silicone-based adhesive sheet which is suitable for use in the manufacture of a small semiconductor device including a MEMS device, and whose production efficiency and yield can be improved.
- the present invention also provides a laminate including the silicone-based adhesive sheet, its use as a die attach film for semiconductor chips or wafers for semiconductors, and its use as a semiconductor device precursor.
- a semiconductor device in particular, a MEMS device
- having a structure in which a semiconductor chip or a semiconductor wafer is fixed on a substrate by a cured product of the silicone-based adhesive sheet, and a method for manufacturing the same are provided.
- the present inventors are able to solve the above-mentioned problems with a silicone adhesive sheet whose surface has an appropriate degree of slight adhesiveness before it exhibits permanent adhesion to an adherend by heating or the like. It has been found that the present invention has been achieved. Specifically, before heating, the peeling mode from the other non-adhesive substrate on the adhesive surface is interfacial peeling, and after heating the adhesive surface in the range of 50 to 200 ° C.
- the above problems can be solved by the silicone-based adhesive sheet in which the peeling mode from the non-adhesive substrate is changed to cohesive failure and exhibits permanent adhesiveness.
- the adherend is preferably a semiconductor member such as a chip, a wafer, a lead frame, a resin substrate, a ceramic substrate, and a stacked chip.
- the sheet surface is slightly adhesive and the chip is Etc. are meant to be suitable for temporary holding and temporary fixing on a substrate such as
- the maximum value of the adhesive strength of the silicone-based adhesive sheet of the present invention may be 10 gf or more or 15 gf or more.
- the thickness of the sheet is preferably in the range of 5 to 1000 ⁇ m.
- the silicone adhesive sheet is characterized in that it is sandwiched between substrates having releasability with respect to the sheet, and at least one of the substrates has an oxygen atom or a sulfur atom at the contact surface with the sheet. It is preferred that Such a silicone-based adhesive sheet is a crosslinked product of a crosslinkable silicone composition, and is obtained by crosslinking the composition between substrates having releasability with respect to the crosslinked product, and at least one of the substrates is It is preferable to have an oxygen atom or a sulfur atom at the interface with the composition.
- the substrate is a sheet-like substrate made of an organic resin
- an oxygen atom is an atom constituting a group selected from the group consisting of a carbonyl group, an alkoxy group, an ester group, and an ether group
- the sulfur atom is preferably an atom constituting a group selected from the group consisting of a sulfone group and a thioether group.
- These adhesive sheets are (A) organopolysiloxanes having at least two silicon-bonded alkenyl groups in one molecule, (B) organopolysiloxanes having at least two silicon-bonded hydrogen atoms in one molecule, It is preferable that it is a crosslinked product of a crosslinkable silicone composition containing (C) at least one adhesion promoter, and (D) a catalyst for hydrosilylation reaction. In addition, it is preferable that at least one surface of the sheet exhibits permanent adhesion to an adherend in contact by heating in the range of 100 to 200 ° C. for 3 hours.
- These adhesive sheets are preferably used for the purpose of adhering a semiconductor chip or a semiconductor wafer to its mounting portion, and in particular, it is preferable to use a die attach film for use in a MEMS device.
- the object of the present invention is also solved by a laminate comprising the above-mentioned silicone adhesive sheet.
- the above-mentioned silicone-based adhesive sheet is sandwiched between substrates having releasability with respect to the sheet, and at least one of the substrates is oxygen on the contact surface with the sheet.
- It is a sheet-like laminate characterized in having atoms or sulfur atoms, and is preferably a die attach film for a semiconductor chip or a wafer for a semiconductor.
- Another suitable laminate is a precursor of a semiconductor device, and is a laminate having a structure in which a semiconductor chip or a semiconductor wafer is disposed on a substrate via the above-mentioned silicone-based adhesive sheet.
- the laminate is a precursor of a semiconductor device having a structure in which a semiconductor chip (die) singulated by dicing is disposed on the die pad via the silicone adhesive sheet described above and temporarily held (temporarily fixed). It may be a body, in particular a precursor of a MEMS device.
- the silicone type adhesive sheet of this invention is suitable for manufacture of a semiconductor device (preferably, MEMS device), and is used for the manufacturing method of the semiconductor device which has the following processes.
- Process 1 A process of laminating the above-mentioned silicone adhesive sheet on the back surface of the semiconductor wafer
- Step 2 A step of singulating the laminate obtained in Step 1 by dicing
- Step 3 Step of placing the semiconductor wafer piece obtained in Step 2 on the semiconductor substrate through the silicone adhesive sheet
- Step 4 The piece of semiconductor wafer obtained in Step 3 is silicone Bonding individual pieces of the semiconductor wafer onto the semiconductor substrate with the silicone adhesive sheet by heating the structure disposed on the semiconductor substrate with the surface of the adhesive sheet in the range of 50 to 200 ° C.
- the silicone type adhesive sheet of this invention is used for the manufacturing method of the semiconductor device (preferably MEMS device) which has the following processes.
- Step 1 Separating the above-mentioned silicone adhesive sheet into a size close to a semiconductor chip
- Step 2 A step of disposing the singulated silicone adhesive sheet obtained in the above step 1 on the semiconductor substrate
- Step 3 On the singulated silicone adhesive sheet disposed on the semiconductor substrate in the step 2
- Step 4 Placing a semiconductor chip on the semiconductor chip: The semiconductor chip obtained in step 3 is placed on the semiconductor substrate by the silicone adhesive sheet surface, and the semiconductor is heated at a temperature of 50 to 200 ° C. Process for bonding semiconductor chip with semiconductor adhesive sheet on semiconductor substrate
- a silicone-based adhesive sheet which is suitable for use in the manufacture of a small semiconductor device including a MEMS device, and whose production efficiency and yield can be improved.
- a laminate including the silicone-based adhesive sheet its use as a die attach film for a semiconductor chip or a wafer for a semiconductor, and use as a semiconductor device precursor.
- a semiconductor device in particular, a MEMS device
- a semiconductor device having a structure in which a semiconductor chip or a semiconductor wafer is fixed on a substrate by a cured product of the silicone-based adhesive sheet, and a method of manufacturing the same.
- the sheet itself temporarily holds a semiconductor chip or the like against vibration or the like without undergoing a process such as thermocompression bonding, and the sheet can be temporarily fixed on a substrate.
- the adhesive property is maintained, and before the die bonding, it is possible to reposition the chip without causing permanent adhesion such as cohesive failure. Therefore, semiconductor chips (including chips singulated by dicing) provided with the adhesive sheet have problems such as positional deviation and chipping of the chips against vibration and the like when disposed on a substrate for semiconductors.
- the production efficiency of a small semiconductor device including a MEMS device can be significantly improved because it is unlikely to occur, and if desired, it is possible to perform interfacial peeling and chip repositioning without problems of adhesive residue.
- the silicone-based adhesive sheet according to the present invention exhibits permanent adhesiveness to the adherend by applying the adhesive to the adherend and then heating or the like.
- the peeling mode is silicone-based adhesive sheet or the cured
- the adhesive layer which is an object, causes cohesive failure almost all over the adhesive surface and remains on the adherend.
- the cohesive failure of the substantially entire surface of the adhesive surface occurs in the range of at least over half (50% or more) of the whole, and the cohesive failure of the adhesive layer may occur in a so-called mottled pattern.
- the silicone adhesive sheet of the present invention exhibits permanent adhesion when heated in the range of 100 to 200 ° C. for 3 hours, but it is also possible to select a temperature of 100 ° C. or less or a heating time of 3 hours or less.
- a temperature of 100 ° C. or less or a heating time of 3 hours or less when the silicone-based adhesive sheet of the present invention is used for the production of a semiconductor device, heating in the range of 50 to 200 ° C. or 50 to 150 ° C. is preferable.
- the heating time can be appropriately selected depending on the size of the semiconductor device, the size of the heating apparatus (oven, die attach press), etc., but the range of several seconds to several hours is preferable in terms of production efficiency.
- irradiation of high energy rays such as ultraviolet rays may be combined for the purpose of bonding at low temperature and short time and reduction of bonding time.
- high energy rays such as ultraviolet rays
- small semiconductor devices such as MEMS may cause operation failure, which is not preferable as a condition for achieving permanent adhesion.
- the silicone-based adhesive sheet according to the present invention is characterized in that the sheet surface has an appropriate level of slight tackiness before it exhibits permanent adhesion to the adherend by the above-mentioned heating or the like.
- the peeling mode is interfacial peeling when arranged with respect to the adherend, meaning that the adhesive layer itself is not broken at the time of peeling, and the adhesive layer is almost completely detached except for a slight transition component.
- the known silicone-based adhesive sheet disclosed in Patent Document 1 or the like does not have fine tackiness or is insufficient or excessive in degree, and is particularly suitable for use in the manufacture of a small semiconductor device including a MEMS device. It is not a thing.
- silicone-based adhesive sheet does not have slight adhesion, positioning and repositioning are particularly difficult in the arrangement of semiconductor chips used for MEMS devices, and so on. It is an important feature of the silicone-based adhesive sheet of the present invention that the sheet can be permanently adhered by heating after passing through.
- the peeling mode from the other non-adhesive substrate on the adhesive surface is interfacial peeling, and the adhesive surface is in the range of 50 to 200 ° C.
- the non-adhesive substrate means a substrate which does not exhibit adhesiveness by itself such as a semiconductor chip, a semiconductor wafer, a lead frame, a resin substrate, a ceramic substrate, a laminated semiconductor chip, a stainless steel plate and the like.
- Such a silicone adhesive sheet is preferably a stainless steel probe having a diameter of 8 mm for any surface of the sheet, using a texture analyzer with respect to the surface of the silicone adhesive sheet before heating.
- the adhesive sheet is peeled off from the interface when the probe is lowered at a speed of 01 mm / sec, held for 0.5 seconds after applying a load of 50 gf, and then raised at a speed of 0.5 mm / sec.
- the surface showing the maximum value of the adhesive strength and further showing the maximum value of the adhesive strength is heated in the range of 100 to 200 ° C. for 3 hours, peeling of the adhesive surface from the other non-adhesive base material It is characterized in that the mode changes to cohesive failure and exhibits permanent adhesion.
- the above heating condition is a test condition for confirming the presence or absence of permanent adhesion of the silicone adhesive sheet according to the present invention, and a low temperature of 50 to 100 ° C. is selected to develop actual permanent adhesion.
- a heating time of less than 3 hours or more than 3 hours may be selected.
- These heating conditions can be suitably selected according to the kind of base material, and manufacturing conditions, such as a semiconductor.
- the maximum value of the adhesive strength may be 10 gf or more or 15 gf or more, and is preferably in the range of 10 gf to 500 gf and 50 gf to 400 gf.
- the surface of any of the above may be single-sided or double-sided, and the tensile distance or maximum value of the adhesive strength at which the maximum value of the adhesive strength is exhibited at each surface may be different.
- the surface is preferably a surface for bonding the semiconductor chip or the semiconductor wafer to the mounting portion on the semiconductor substrate.
- the present invention provides a silicone-based adhesive sheet with fine adhesion suitable for the production of a small semiconductor device including a MEMS device, and the silicone-based adhesive sheet satisfying the above conditions is not limited to the composition thereof.
- the object of the present invention can be achieved. That is, using a texture analyzer, a stainless steel probe with a diameter of 8 mm is lowered relative to the sheet surface at a speed of 0.01 mm / sec, held for 50 seconds after a load of 50 gf is applied, and then 0.5 mm / sec.
- Suitable for temporary holding and temporary fixing on a substrate such as a chip by selecting a silicone-based adhesive sheet having a maximum value of adhesion when raising the probe at a speed of Die bonding of the semiconductor device is possible without causing any problems.
- a silicone-based adhesive sheet having no maximum value of adhesive strength is used in the above test, chips and the like may be easily displaced from a predetermined position from a base or peeled off due to vibration or the like.
- the method for achieving the above-mentioned slight tackiness is not limited, and for the crosslinkable silicone composition forming the sheet, control of its main agent or crosslinking agent, crosslink density of the composition Control of SiH / Vi ratio), selection or addition of slightly tackifying component such as silicone resin in the composition, selection or addition of adhesion promoter to the composition, base material for curing the composition It is possible to solve by combining one or more kinds of means selected from chemical modification of the contact surface and the like.
- the slight tackiness of the surface specified using the above-mentioned texture analyzer can be objectively measured or specified, the slight tackiness of the surface is designed in the above range by a desired method. Good.
- the silicone-based adhesive sheet of the present invention is not particularly limited in terms of its composition or manufacturing method, except that it has a surface with a slight tackiness specified using the expression of permanent adhesiveness and the above-mentioned texture analyzer.
- those formed of a crosslinked product of a crosslinkable silicone composition are preferred.
- the degree of crosslinking of the crosslinked product forming the adhesive sheet is not limited, and the crosslinked silicone composition is crosslinked and completely crosslinked to such a state that the hardness of the crosslinked product is not substantially changed. Or crosslinks, swells with solvent, but does not completely dissolve, and the crosslinkable silicone composition loses its fluidity, ie, JIS K 6800 (adhesive / adhesive term)
- a state such as B-stage (cured intermediate of thermosetting resin) as defined is exemplified.
- the silicone-based adhesive sheet is a surface having the above-mentioned slightly adhesive property (one side or both sides), and the surface having the maximum value of the adhesive strength mentioned above is adhered to an adherend by heating in the range of 50 to 200 ° C. It is preferable to develop permanent adhesiveness, and it is preferable that the said layer is formed of the crosslinked material of a crosslinkable silicone composition.
- the internal structure is not limited, and, for example, an organic resin support such as a silicone rubber sheet, a polyimide resin sheet, a polyester resin sheet, an epoxy resin sheet, or an inorganic material such as silica particles, glass particles, or alumina particles. Or an organic filler such as silicone rubber particles, polyimide resin particles, polyester resin particles, and epoxy resin particles.
- the shape of such a silicone-based adhesive sheet is not limited, and the thickness thereof is not limited, but is preferably in the range of 1 to 5000 ⁇ m for practical use, particularly preferably in the range of 10 to 1000 ⁇ m, It may be in the range of 10 to 500 ⁇ m.
- the silicone-based adhesive sheet of the present invention is preferably formed by crosslinking the composition between substrates having releasability with respect to a crosslinked product of the crosslinkable silicone composition, and the substrate It is particularly preferable that at least one of them has an oxygen atom and / or a sulfur atom on the side in contact with the composition.
- the oxygen atom is preferably an atom constituting a group selected from the group consisting of a carbonyl group, an alkoxy group, an ester group, and an ether group.
- this sulfur atom is preferably an atom constituting a group selected from the group consisting of a sulfone group and a thioether group.
- the presence or absence of the oxygen atom and / or the sulfur atom of the substrate surface having such peelability, in particular, the group having the oxygen atom and / or the sulfur atom as its constituent atoms is, for example, elemental analysis, fluorescent X-ray analysis, X It can be easily confirmed by line microanalyzer analysis, infrared absorption analysis, ESCA analysis and the like.
- the content of such an atom or group is not limited, and it is sufficient if the content can be detected by the above analysis method.
- polyester resin As a base material having such atoms or groups and having releasability, polyester resin, polyether resin, polyether ether ketone resin, epoxy resin, having such atoms or groups in constituent molecules Phenol resin, polyoxymethylene resin, polyamide resin, polyether imide resin, polysulfone resin, polyether sulfone resin, polyphenylene sulfide resin are exemplified, and further, there is no such atom or group in the constituent molecule, Chemically bonded to the surface of polyethylene resin, polypropylene resin, fluorine resin oil, etc.
- the base material which consists only of these organic resin may be sufficient, and the composite material which consists of these organic resin may be sufficient.
- the substrate is preferably a substrate having a large dielectric constant and / or refractive index with respect to a crosslinkable product of the crosslinkable silicone composition.
- a sheet-like substrate as it can be used as a protective material of the silicone adhesive sheet as it is, for example, a semiconductor chip and the like When sticking this to adherends, such as a chip
- the silicone-based adhesive sheet after the production of the silicone-based adhesive sheet, it may be attached to another peelable substrate.
- the peelable substrate in this case is not limited.
- the silicone-based adhesive sheet of the present invention is a crosslinked product of a crosslinkable silicone composition and the composition is crosslinked between substrates having releasability with respect to the crosslinked product, finally What is obtained is sandwiched between substrates having releasability with respect to the sheet, and preferably, at least one of the substrates has an oxygen atom or a sulfur atom at the contact surface with the sheet. It is a silicone adhesive sheet to be used.
- Crosslinkable silicone composition In the silicone adhesive sheet, as the crosslinkable silicone composition, it is preferable to use a hydrosilylation reaction type, and in particular, as the hydrosilylation reaction type crosslinkable silicone composition, at least 2 in one molecule of (A) Organopolysiloxanes having one silicon-bonded alkenyl group, (B) an organopolysiloxane having at least two silicon hydrogen atoms in one molecule, (C) at least one adhesion promoter, and (D) hydrosilylation It is preferable that it is a crosslinkable silicone composition which consists of at least a catalyst for reaction.
- the component (A) is a main component of the above composition, and is composed of one or more alkenyl group-containing organopolysiloxanes.
- the molecular structure of such alkenyl group-containing organopolysiloxane is not particularly limited, and examples thereof include linear, branched, cyclic, three-dimensional network structures, and combinations thereof.
- the silicon-bonded alkenyl group in the component (A) is exemplified by a vinyl group, an allyl group, a butenyl group, a pentenyl group and a hexenyl group, with a vinyl group being particularly preferable.
- alkenyl group a molecular chain end and / or a molecular chain side chain is exemplified.
- alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl and heptyl; phenyl and tolyl Aryl groups such as xylyl group and naphthyl group; aralkyl groups such as benzyl group and phenethyl group; halogenated alkyl groups such as chloromethyl group, 3-chloropropyl group and 3,3,3-trifluoropropyl group
- a substituted or unsubstituted monovalent hydrocarbon group is exemplified, and in particular, a methyl group or a phenyl group is preferable.
- the silicone adhesive sheet to be obtained has excellent cold resistance and the reliability of the semiconductor device manufactured using this silicone adhesive sheet is further improved, the silicon atom in the component (A) can be obtained.
- the content of the phenyl group is 1 mol% or more, more preferably in the range of 1 to 60 mol%, particularly preferably in the range of 1 to 30 mol% with respect to the organic group bound. It is preferably inside.
- the viscosity of the component (A) is not limited, it is preferable that the viscosity at 25 ° C. be in the range of 100 to 1,000,000 mPa ⁇ s.
- the component (A) is a linear alkenyl group-containing organopolysiloxane, preferably containing an alkenyl group at least at both molecular chain terminals, containing an alkenyl group at only both molecular chain terminals It may be Such a component (A) is not particularly limited, and for example, dimethylpolysiloxane blocked with dimethylvinylsiloxy groups at both ends of molecular chain, dimethylvinylsiloxy copolymer blocked with dimethylvinylsiloxy groups blocked at both ends with molecular chain, both molecular chains Terminal trimethylsiloxy group-capped dimethylsiloxane / methylvinylsiloxane copolymer, molecular chain both terminal trimethylsiloxy group-capped dimethylsiloxane / methylvinylsiloxane / methylphenyl siloxane copolymer, molecular chain double-ended silanol group dimethylsiloxan
- Component (B) is a crosslinking agent of the above composition, and is an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule.
- Examples of the molecular structure of the component (B) include linear, partially branched linear, branched, cyclic, and network. Further, as the bonding position of the hydrogen atom bonded to the silicon atom in the component (B), a molecular chain end and / or a molecular chain side chain is exemplified.
- alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl and heptyl; phenyl and tolyl Aryl groups such as xylyl group and naphthyl group; aralkyl groups such as benzyl group and phenethyl group; halogenated alkyl groups such as chloromethyl group, 3-chloropropyl group and 3,3,3-trifluoropropyl group
- a substituted or unsubstituted monovalent hydrocarbon group is exemplified, and in particular, a methyl group or a phenyl group is preferable.
- the viscosity of the component (B) is not limited, but the viscosity at 25 ° C. is in the range of 1 to 1,000 mPa ⁇ s, preferably in the range of 1 to 500 mPa ⁇ s. Furthermore, low molecular weight siloxane oligomers (octamethyltetrasiloxane (D4), decamethylpentasiloxane (D5)) may be reduced or removed from the viewpoint of contact failure prevention and the like.
- the structure of component (B) and the number (average value) of silicon-bonded hydrogen atoms in the molecule may be designed.
- a linear organo chain having at least two in the molecular side chain Hydrogen polysiloxane may be used as a chain extender, and a large number of silicon-bonded hydrogen atoms in the side chain organohydrogenpolysiloxane may be used as a crosslinking agent in order to obtain a cured product having high hardness. You may use these together.
- the compounding amount of the component (B) is an amount sufficient to crosslink the component (A), which corresponds to the amount of silicon in this component relative to 1 mole of silicon-bonded alkenyl group in the component (A).
- the amount is preferably such that the atomically bonded hydrogen atom is in the range of 0.5 to 10 mol, and particularly preferably in the range of 1 to 3 mol. This is because the above composition has a silicon atom-bonded hydrogen atom in this component in a mole number less than the above range per mol of silicon atom-bonded alkenyl group in component (A). It is because there is a tendency of not to crosslink, and on the other hand, if the number of moles exceeds this range, the heat resistance of the crosslinked product obtained by crosslinking the above composition tends to decrease.
- the component (C) is a component for imparting good adhesion to the crosslinked product of the above composition, and is at least one adhesion promoter, and (i) a silicon-bonded alkenyl group or silicon in one molecule A siloxane having at least one atomically bonded hydrogen atom and at least one silicon-bonded alkoxy group, (ii) at least one silicon-bonded alkenyl group, a silicon-bonded alkoxy group and a silicon-bonded epoxy-containing monovalent organic group in one molecule (Iii) Silane or siloxane having at least one silicon-bonded alkoxy group in one molecule, and organosiloxane having at least one silicon-bonded hydroxy group and one silicon-bonded alkenyl group in one molecule Mixtures or reaction mixtures, and (iv) silicon-bonded alkoxy groups and Mixture or reaction of an organosilane or organosiloxane having at least one monovalent atom-bonded epoxy group-containing monovalent organic group and an organosiloxane
- the molecular structure of the siloxane having at least one silicon-bonded alkenyl group or silicon-bonded hydrogen atom and at least one silicon-bonded alkoxy group in one molecule is linear or partially.
- examples thereof include linear, branched, cyclic and network having a branch, and in particular, linear, branched and network are preferable.
- the silicon-bonded alkenyl group in this siloxane include a vinyl group, an allyl group, a butenyl group, a pentenyl group and a hexenyl group, and a vinyl group is particularly preferable.
- a methoxy group As a silicon atom-bonded alkoxy group in this siloxane, a methoxy group, an ethoxy group, a propoxy group, a butoxy group and a methoxyethoxy group are exemplified, and a methoxy group is particularly preferable.
- an alkyl group such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group and the like
- Aryl groups such as phenyl, tolyl, xylyl and naphthyl; aralkyl such as benzyl and phenethyl; halogen such as chloromethyl, 3-chloropropyl and 3,3,3-trifluoropropyl
- Substituted or unsubstituted monovalent hydrocarbon group such as substituted alkyl group
- glycidoxy alkyl group such as 3-glycidoxypropyl group, 4-glycidoxybutyl group
- silane or siloxane having at least one silicon-bonded alkoxy group and organosiloxane having at least one silicon-bonded hydroxy group and at least one silicon-bonded alkenyl group in one molecule examples include a methoxy group, an ethoxy group, a propoxy group, a butoxy group and a methoxyethoxy group, and a methoxy group is particularly preferable.
- the silicon atom of this silane is an alkyl group such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group or heptyl group; vinyl group, allyl group, butenyl group, Alkenyl groups such as pentenyl group and hexenyl group; aryl groups such as phenyl group, tolyl group, xylyl group and naphthyl group; aralkyl groups such as benzyl group and phenethyl group; chloromethyl group, 3-chloropropyl group, 3,3, Substituted or unsubstituted monovalent hydrocarbon groups such as halogenated alkyl groups such as 3-trifluoropropyl group; glycidoxyalkyl groups such as 3-glycidoxypropyl group, 4-glycidoxybutyl group; 2- (3,4-epoxy ring such as (3,
- Epoxy-containing monovalent organic group such as hexyl) alkyl group; oxiranyl alkyl group such as 4-oxiranylbutyl group, 8-oxiranyloctyl group etc. It is preferable to have at least one epoxy-containing monovalent organic group in one molecule, since it can also impart good adhesion.
- linear, partially branched linear, branched, cyclic and network are exemplified, and in particular, linear, branched and network Is preferred.
- alkoxy group bonded to the silicon atom in the siloxane include a methoxy group, an ethoxy group, a propoxy group, a butoxy group and a methoxyethoxy group, and a methoxy group is particularly preferable.
- the silicon atom of this siloxane is an alkyl group such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group or heptyl group; vinyl group, allyl group, butenyl group, Alkenyl groups such as pentenyl group and hexenyl group; aryl groups such as phenyl group, tolyl group, xylyl group and naphthyl group; aralkyl groups such as benzyl group and phenethyl group; chloromethyl group, 3-chloropropyl group, 3,3, Substituted or unsubstituted monovalent hydrocarbon groups such as halogenated alkyl groups such as 3-trifluoropropyl group; glycidoxyalkyl groups such as 3-glycidoxypropyl group, 4-glycidoxybutyl group; 2- (3,4-ep
- the viscosity of such a siloxane is not limited, but is preferably in the range of 1 to 500 mPa ⁇ s at 25 ° C.
- the molecular structure of the latter organosiloxane is exemplified by linear, partially branched linear, branched, cyclic, and network, and in particular, linear, branched, and network Is preferred.
- Examples of the alkenyl group bonded to the silicon atom in this organosiloxane include a vinyl group, an allyl group, a butenyl group, a pentenyl group and a hexenyl group, and a vinyl group is particularly preferable.
- alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group and heptyl group; phenyl group Aryl groups such as tolyl group, xylyl group and naphthyl group; aralkyl groups such as benzyl group and phenethyl group; halogenated alkyl groups such as chloromethyl group, 3-chloropropyl group and 3,3,3-trifluoropropyl group And substituted or unsubstituted monovalent hydrocarbon groups such as
- the viscosity of such an organosiloxane is not limited, but is preferably in the range of 1 to 500 mPa ⁇ s at 25 ° C.
- the ratio of the silane or siloxane having at least one silicon-bonded alkoxy group and the organosiloxane having at least one silicon-bonded hydroxy group and at least one silicon-bonded alkenyl group in one molecule is not particularly limited. It is preferable that the weight ratio of the former silane or siloxane to the latter organosiloxane is in the range of 1/99 to 99/1 because the adhesiveness can be imparted.
- a reaction mixture of an alkoxysilane having an amino group-containing organic group and an alkoxysilane having an epoxy group-containing organic group can be used, and the reaction ratio is a molar ratio of (1: 1 .5) to (1: 5) is preferable, and it is particularly preferable to be in the range from (1: 2) to (1: 4).
- This component can be easily synthesized by mixing an alkoxysilane having an amino group-containing organic group as described above and an alkoxysilane having an epoxy group-containing organic group and reacting them at room temperature or under heating. .
- R 1 is an alkyl group or an alkoxy group
- R 2 is the same or different general formula:
- R 4 is an alkylene group or an alkylene oxyalkylene group
- R 5 is a monovalent hydrocarbon group
- R 6 is an alkyl group
- R 7 is an alkylene group
- R 8 is an alkyl group
- An alkenyl group or an acyl group, a is 0, 1 or 2
- R 3 is a group selected from the group consisting of and R 3 is the same or different hydrogen atom or alkyl group.
- the component is an organic compound having at least two alkoxysilyl groups in one molecule and containing a bond other than a silicon-oxygen bond between the silyl groups, which alone improves the initial adhesion.
- the cured product comprising the adhesion promoter functions to improve the adhesion durability under severe conditions.
- the compounding amount of the component (C) is an amount sufficient to impart good adhesiveness to the crosslinked product of the above composition, and for example, it is in the range of 0.01 to 20 parts by weight with respect to 100 parts by weight of the component (A). It is preferable that the amount be an internal amount, and it is particularly preferable that the amount be in the range of 0.1 to 10 parts by weight. If the content of the component (C) is less than this range, the adhesion of the cured product tends to decrease, while if it exceeds this range, the adhesion is not affected, but rather, silicone This is because the stability of the adhesive sheet tends to decrease.
- the component (D) is a catalyst for accelerating the curing of the above composition by the hydrosilylation reaction, and exemplified by platinum based catalysts, rhodium based catalysts and palladium based catalysts, and it is possible to remarkably accelerate the curing of the present composition and thus platinum based Catalysts are preferred.
- platinum-based catalyst platinum fine powder, platinum black, platinum-supported silica fine powder, platinum-supporting activated carbon, chloroplatinic acid, chloroplatinic acid alcohol solution, platinum-alkenyl siloxane complex, platinum-olefin complex, platinum-carbonyl complex And catalysts obtained by dispersing or encapsulating these platinum-based catalysts with thermoplastic resins such as silicone resins, polycarbonate resins and acrylic resins, and in particular, platinum-alkenyl siloxane complexes are preferable because they have a good reaction rate. .
- alkenyl siloxane 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane,
- the alkenyl siloxane which substituted a part of methyl group of these alkenyl siloxanes by the ethyl group, the phenyl group, etc., and the alkenyl siloxane which substituted the vinyl group of these alkenyl siloxanes with the allyl group, the hexenyl group etc. is illustrated.
- 1,3-divinyl-1,1,3,3-tetramethyldisiloxane is preferable because the stability of the platinum-alkenylsiloxane complex is good.
- a particulate platinum-containing hydrosilylation reaction catalyst dispersed or encapsulated with a thermoplastic resin may be used.
- a non-platinum-based metal catalyst such as iron, ruthenium or iron / cobalt may be used as a catalyst for promoting the hydrosilylation reaction.
- the compounding amount of the component (D) is an amount sufficient to accelerate the curing of the composition, and when a platinum-based catalyst is used, the platinum metal atom is 0.01 in mass unit in the composition.
- the amount is in the range of ⁇ 500 ppm, the amount is in the range of 0.01 to 100 ppm, or the amount is in the range of 0.01 to 50 ppm. If the amount of the component (D) incorporated is less than this range, the curing rate of the resulting composition tends to be extremely slow, while even if the amount is beyond this range, the curing rate is too low. It has no influence, but rather causes problems such as coloring.
- the composition is obtained by uniformly mixing the components (A) to (D), and the composition is heated to a temperature range of room temperature or room temperature to 200 ° C., preferably to a temperature range of room temperature to 150 ° C.
- the hydrosilylation reaction can be carried out to form the silicone-based adhesive sheet of the present invention which is a crosslinked product of a crosslinkable silicone composition.
- a hydrosilylation reaction inhibitor such as 3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 3-phenyl-1-butyn-3-ol and the like Compounds; Enyne compounds such as 3-methyl-3-penten-1-yne and 3,5-dimethyl-3-hexen-1-yne; 1,3,5,7-tetramethyl-1,3,5,7 -Cycloalkenyl siloxanes such as -tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenyl cyclotetrasiloxane; and triazole compounds such as benzotriazole are used without particular limitation be able to.
- inorganic fillers such as carbon black, silicon carbide, silicon nitride and boron nitride; inorganic fillers obtained by treating these fillers with organosilicon compounds such as organohalosilanes, organoalkoxysilanes and organosilazanes; silicone resins, epoxy resins Fine particles of organic resin such as fluorine resin; Filler such as conductive metal powder such as silver and copper, dye, pigment, flame retardant, solvent and the like can be blended.
- curable epoxy resins curable epoxy-modified silicone resins, curable silicone-modified epoxy resins, curable polyimide resins, curable polyimide-modified silicone resins, curable silicone-modified polyimide resins, etc. It can be blended.
- the above-mentioned silicone-based adhesive sheet is formed, for example, by crosslinking the composition between substrates having releasability to a crosslinked product of the crosslinkable silicone composition, and at least one of the substrates has the composition. It can be manufactured by a method characterized in that it has an oxygen atom and / or a sulfur atom on the surface in contact with an object.
- the oxygen atom and / or the sulfur atom are as defined above.
- a method of producing a silicone-based adhesive sheet a method of crosslinking in a state where a crosslinkable silicone composition is sandwiched between the above-mentioned substrates, a support such as a silicone rubber sheet, an organic resin sheet
- the composition is uniformly coated on both sides and then crosslinked in a state of being sandwiched between these substrates, the composition containing a filler such as silicone rubber particles, organic resin particles, inorganic particles, etc.
- a method of crosslinking in a state of being sandwiched between In order to prepare a silicone-based adhesive sheet by being sandwiched between these substrates, it is possible to crosslink the crosslinkable silicone composition after forming it with a two-roll or press machine or while forming it. preferable.
- the silicone-based adhesive sheet according to the present invention is preferably used for bonding a semiconductor chip or a semiconductor wafer to its mounting portion, and in particular, is a die attach film application used for a MEMS device.
- the MEMS device is a generic term for a semiconductor device formed by using a semiconductor microfabrication technology generally called Micro Electro Mechanical Systems, and is an inertial sensor such as an acceleration sensor or an angular velocity sensor provided with a MEMS chip.
- the semiconductor device may be any known one without particular limitation, and examples include diodes, transistors, thyristors, monolithic ICs, hybrid ICs, LSIs, and VLSIs, and semiconductor chips of these semiconductor devices (including MEMS devices) according to the present invention It can be suitably used for applications where it is temporarily fixed to the chip mounting portion by the silicone adhesive sheet according to the above, and is permanently bonded by heating or the like.
- the above-mentioned silicone adhesive sheet is sandwiched between substrates having releasability with respect to the sheet from the viewpoint of handling workability, and at least one of the substrates is an oxygen atom on the contact surface with the sheet.
- it is a sheet-like laminated body characterized by having a sulfur atom, and it is preferable that it is a die attach film for semiconductor chips or wafers for semiconductors.
- the above-mentioned silicone-based adhesive sheet may be laminated on a semiconductor member such as a semiconductor wafer or a semiconductor chip used for the above-mentioned semiconductor device (particularly, MEMS device etc.).
- the method of the lamination is not particularly limited, the lamination may be directly laminated utilizing the slight adhesiveness which is a feature of the present silicone-based adhesive sheet, or may be pressure-bonded or heat-pressed.
- the silicon-based adhesive of the present invention can be obtained by singulating the semiconductor wafer as a semiconductor wafer or a semiconductor chip provided with the silicone-based adhesive sheet in the state of the laminate using a known means such as dicing.
- the semiconductor chip (die) having a sheet can be placed (mounted) on a mounting portion on a semiconductor substrate such as a die pad. Also, at that time, the surface of the silicone-based adhesive sheet of the mounting portion is provided with the above-mentioned slight adhesiveness, so that the semiconductor chip (die) can be easily semiconductor only by pressure bonding or physical installation for a very short time. It has the advantage that it can be temporarily fixed on a base material, and moreover, it is difficult for displacement and peeling to occur due to vibration and the like.
- the semiconductor substrate is not particularly limited with respect to the material and the like, but may be a substantially flat plate, and the material is not particularly limited, but the semiconductor chip, aluminum, iron, zinc, copper, magnesium alloy And metal, ceramic, glass, epoxy resin, polyimide resin, phenol resin, Bakelite resin, melamine resin, glass fiber reinforced epoxy resin, acrylic resin, plastics such as ABS and SPS, and glass.
- the thickness of the substrate is not particularly limited, but may be 0.1 to 10 mm. In addition, these alone do not have tackiness and are non-tacky substrates.
- Such a laminate is a precursor of the above-mentioned semiconductor device (particularly, MEMS device etc.), and a semiconductor chip or a wafer for semiconductor is disposed on a substrate through the silicone adhesive sheet as described above. It is a laminated body which has a structure.
- the laminate has a structure in which semiconductor chips (dies) separated by dicing are disposed on a circuit board such as a die pad via the above-mentioned silicone adhesive sheet and temporarily held (temporarily fixed). It may be a precursor of a semiconductor device, in particular it may be a precursor of a MEMS device.
- a semiconductor device preferably having a structure in which a semiconductor chip or a semiconductor wafer is fixed on a substrate by the cured product of the above-mentioned silicone-based adhesive sheet by heating the entire laminate to, for example, 50 ° C. or higher.
- the heating temperature and heating time for exhibiting permanent adhesion are the same as the above.
- the semiconductor device (particularly, a MEMS device) further includes a circuit wire, a bonding wire or a bump for connecting the chip and the circuit wire, and a resin layer for sealing a part or all of the circuit wire or the chip. It can be designed appropriately according to the type or application of the semiconductor device. Further, the semiconductor device may have a horizontally arranged structure, a vertically arranged structure, or a three-dimensionally stacked structure.
- the silicone adhesive sheet described above can be temporarily fixed or repositioned even in an arrangement other than the horizontal direction because its surface is slightly tacky. Positional displacement is unlikely to occur due to shocks and vibrations caused by wiring etc., and chips can be attached permanently by heating the semiconductor device precursor as it is, so it is flexible in various semiconductor device design and manufacturing processes. There are benefits that can be addressed.
- the silicone-based adhesive sheet of the present invention is suitable for manufacturing a semiconductor device (preferably, a MEMS device), and is used in a method for manufacturing a semiconductor device, having the following steps.
- Process 1 A process of laminating the above-mentioned silicone adhesive sheet on the back surface of the semiconductor wafer
- Step 2 A step of singulating the laminate obtained in Step 1 by dicing
- Step 3 Step of placing the semiconductor wafer piece obtained in Step 2 on the semiconductor substrate through the silicone adhesive sheet
- Step 4 The piece of semiconductor wafer obtained in Step 3 is silicone Bonding individual pieces of the semiconductor wafer onto the semiconductor substrate with the silicone adhesive sheet by heating the structure disposed on the semiconductor substrate with the surface of the adhesive sheet in the range of 50 to 200 ° C.
- the above step 1 is a step of laminating the above-mentioned silicone adhesive sheet on the back surface of the semiconductor wafer, and for semiconductors having a silicone adhesive sheet on at least one side by means such as pressure bonding or placement on a slightly adhesive surface. It is a process of creating a wafer. At this time, if necessary, an electrode or a protective film may be formed on the wafer in advance. In addition, after the application of the silicone adhesive sheet, an excess silicone adhesive sheet may be cut off, and the peelable sheet-like base material covering the mounting surface side of the silicone adhesive sheet to the semiconductor base material is peeled off in advance. It is also good.
- the above-mentioned step 2 is a so-called dicing step and is a step of forming a semiconductor wafer having a silicone-based adhesive sheet on at least one side into individual pieces (die) of semiconductor chips.
- a semiconductor chip having a length of 10 mm or less, preferably 5 mm or less, may be produced and is preferable.
- the attachment surface side to the semiconductor base material of a silicone type adhesive sheet is covered by the peelable sheet-like base material, it is necessary to peel off the said sheet-like base before the process 3.
- the above step 3 is a so-called mounting step, in which a semiconductor chip (die) separated by dicing is disposed on a circuit board such as a die pad through the above silicone adhesive sheet and temporarily held ( It is a process of producing the temporarily fixed semiconductor precursor. Note that after the step, processing of a semiconductor chip by sputtering, wiring processing with an electrode, or the like may be performed.
- the above step 4 is a step of permanently bonding the adherend and the silicone-based adhesive sheet of the present invention, and the pieces of the semiconductor wafer are adhered on the semiconductor substrate by the silicone-based adhesive sheet by post curing.
- the heating conditions and the like are as described above.
- the individual pieces of a large number of semiconductor wafers can simultaneously process the structure disposed on the semiconductor substrate by the surface of the semiconductor adhesive sheet in the step 4, the industrial production efficiency is remarkably excellent, such as a MEMS device. Even minute and high precision semiconductor devices can be easily mass-produced.
- high energy radiation such as ultraviolet light may be used in combination.
- the method of manufacturing a semiconductor device comprises the above steps 1 to 4, but if desired, a step of forming a protective film on a wafer, a step of wiring processing to a semiconductor substrate, a step of connecting chips and electrodes, It goes without saying that the polishing process step or a part or all of the sealing step may be included at a desired timing.
- the silicone adhesive sheet of the present invention may be used as a method of manufacturing a semiconductor device (preferably, a MEMS device) in a method including the following steps.
- Step 1 Separating the above-mentioned silicone adhesive sheet into a size close to a semiconductor chip
- Step 2 A step of disposing the singulated silicone adhesive sheet obtained in the above step 1 on the semiconductor substrate
- Step 3 On the singulated silicone adhesive sheet disposed on the semiconductor substrate in the step 2
- Step 4 By heating the structure obtained by Step 3 above, in which the semiconductor chip is disposed on the semiconductor substrate by the silicone adhesive sheet surface, in the range of 50 to 200 ° C.
- the above step 1 is a step in which the above silicone adhesive sheet is separated into pieces in advance, and the size is made similar to a semiconductor chip to which the silicone adhesive sheet is adhered by means such as die cutting, laser cutting, punching and the like. It is a process. At this time, the silicone-based adhesive sheet may be in contact with the substrate on one side or both sides, and may be replaced with another substrate. In order to facilitate handling of the silicone-based adhesive sheet singulated in the above-mentioned step 2, it is preferable that a substrate singulated in the same size be in contact with one side.
- the above-mentioned step 2 is a step of arranging the singulated adhesive sheet on the semiconductor substrate and temporarily holding (temporarily fixing) it. Pick up two layers of silicone adhesive sheet single layer or releasable sheet-like substrate by collet etc., place on semiconductor substrate and heat to increase peeling force between semiconductor substrate and silicone adhesive sheet . In addition, also in this stage, when the attachment surface side to the semiconductor base material of a silicone type adhesive sheet is covered by the peelable sheet-like base material, it is necessary to peel off the said sheet-like base before the process 3.
- Step 3 described above is a so-called mounting step, in which semiconductor chips (die) separated by dicing are disposed on a silicone adhesive sheet disposed on a semiconductor substrate and temporarily held (temporarily fixed) ) Is a step of producing the semiconductor precursor. Note that after the step, processing of a semiconductor chip by sputtering, wiring processing with an electrode, or the like may be performed.
- the said member has the structure where semiconductor base material / silicone type adhesive sheet / semiconductor chip was laminated
- the above step 4 is a step of permanently bonding the adherend and the silicone-based adhesive sheet of the present invention, and the pieces of the semiconductor wafer are adhered on the semiconductor substrate by the silicone-based adhesive sheet by post curing.
- the heating conditions and the like are as described above.
- the individual pieces of a large number of semiconductor wafers can simultaneously process the structure disposed on the semiconductor substrate by the surface of the semiconductor adhesive sheet in the step 4, the industrial production efficiency is remarkably excellent, such as a MEMS device. Even minute and high precision semiconductor devices can be easily mass-produced.
- high energy radiation such as ultraviolet light may be used in combination.
- the method of manufacturing a semiconductor device comprises the above steps 1 to 4, but if desired, a step of forming a protective film on a wafer, a step of wiring processing to a semiconductor substrate, a step of connecting chips and electrodes, It goes without saying that the polishing process step or a part or all of the sealing step may be included at a desired timing.
- the silicone-based adhesive sheet of the present invention has a certain degree of elastomer (flexibility) when used as a permanent adhesive layer, it can be formed on a semiconductor substrate as compared with synthetic resin sheets such as conventionally known epoxy-based adhesive sheets. It has the advantage of being superior in impact and stress relaxation to a mounted semiconductor chip (die). As a result, the production efficiency of a fine and high-precision semiconductor device such as a MEMS device can be improved, and the reliability and yield thereof can be improved.
- the silicone-based adhesive sheet of the present invention will be described in detail by way of examples and comparative examples, but the present invention is not limited thereto.
- the viscosities in the examples are values measured at 25 ° C., and the adhesion of the silicone adhesive sheet and the surface condition of the sheet are evaluated as follows using a texture analyzer (Model: TAXTplus, manufactured by Eiko Seiki) did.
- Examples 1 to 5, Comparative Examples 1 to 4 Hereinafter, the present invention will be described by way of examples, but the present invention is not limited thereto.
- Examples 1 to 5 and Comparative Examples 1 and 2 shown below the following compounds or compositions were used as raw materials.
- Comparative Examples 3 and 4 a commercially available silicone pressure-sensitive adhesive product was used as it was.
- A1 Dimethylvinylsiloxy-blocked dimethylpolysiloxane having a viscosity of 2,000 mPa ⁇ s and having both chain ends (a vinyl content of 0.23% by weight)
- (D) a complex of platinum and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane having a platinum concentration of 0.6% by weight
- Comparative Example 3 A silicone adhesive SD4580 FC made by Toray Dow Corning was coated on a PET film of 50 ⁇ m thickness and heat cured under the conditions of 120 ° C. for 5 minutes to obtain a silicone film of 80 ⁇ m thickness. Comparative Example 4 A silicone adhesive SD4584 FC manufactured by Toray Dow Corning was coated on a 50 ⁇ m-thick PET film and heat cured under the conditions of 120 ° C. for 5 minutes to obtain a silicone film having a thickness of 80 ⁇ m.
- the stress applied to the probe as it rose was measured.
- the maximum value was obtained when the maximum value was obtained at the time of measurement, the maximum value was not obtained when the maximum value was not obtained, and the maximum value of the values obtained during the measurement was taken as tackiness (gf).
- the silicone adhesive sheet having the maximum value the adhesive sheet peeled off at the interface from the probe, and no adhesive residue or the like was caused due to the cohesive failure of the adhesive layer.
- the silicone-based adhesive sheet in which the peeling mode exhibits interfacial peeling and the behavior of having a maximum value in the surface tackiness test was temporarily fixed to the silicon chip. It has excellent properties, and also has the property of developing permanent adhesion after heating under heating conditions of 100 to 200 ° C. within 3 hours.
- Comparative Examples 3 to 4 although the silicone pressure-sensitive adhesive exhibits good temporary fixation, it does not exhibit permanent adhesiveness after heating as in the silicone-based adhesive sheet of the present invention, and is fine and like MEMS devices. The production efficiency of high precision semiconductor devices can not be improved. Further, in Comparative Examples 1 and 2, the surface tackiness is insufficient, and it is difficult to use for temporarily fixing or temporarily arranging a silicon chip.
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Abstract
Description
工程1:上記のシリコーン系接着シートを半導体用ウェハの背面に積層する工程、
工程2:上記工程1で得た積層体をダイシングにより個片化する工程、
工程3:上記工程2で得た半導体用ウェハの個片を、シリコーン系接着シート面を介して半導体基材上に配置する工程
工程4:工程3で得た、半導体用ウェハの個片がシリコーン系接着シート面により半導体基材上に配置された構造体を50~200℃の範囲で加熱することにより、半導体用ウェハの個片をシリコーン系接着シートにより半導体基材上に接着する工程
工程1:上記のシリコーン系接着シートを半導体チップに近似した大きさに個片化する工程、
工程2:上記工程1で得た個片化したシリコーン系接着シートを半導体基材上に配置する工程
工程3:上記工程2で半導体基材上に配置された個片化したシリコーン系接着シート上に半導体チップを配置する工程
工程4:工程3で得た、半導体用チップがシリコーン系接着シート面により半導体基材上に配置された構造体を50~200℃の範囲で加熱することにより、半導体用チップをシリコーン系接着シートにより半導体基材上に接着する工程
本発明にかかるシリコーン系接着シートは、被着体に貼着した後、これを加熱等することにより、該被着体に対する永久接着性を発現するものである。ここで、永久接着とは、当該被着体からシリコーン系接着シートまたはその硬化物(加熱により得られたポストキュア硬化物を含む)を剥離させる場合、その剥離モードがシリコーン系接着シートまたはその硬化物である接着層が、接着面のほぼ全面において凝集破壊を起こし、被着体上に残留する接着状態である。なお、ここで、接着面のほぼ全面とは、全体の少なくとも過半(50%以上)の範囲で凝集破壊が生じるものであり、いわゆる斑模様に接着層の凝集破壊が発生してもよい。
このシリコーン系接着性シートにおいて、架橋性シリコーン組成物としてはヒドロシリル化反応型のものを用いることが好ましく、特に、このヒドロシリル化反応型架橋性シリコーン組成物として、(A)一分子中に少なくとも2個のケイ素原子結合アルケニル基を有するオルガノポリシロキサン、(B)一分子中に少なくとも2個のケイ素原子水素原子を有するオルガノポリシロキサン、(C)少なくとも一種の接着促進剤、および(D)ヒドロシリル化反応用触媒から少なくともなる架橋性シリコーン組成物であることが好ましい。
で表される基からなる群から選択される基であり、R3は同じかまたは異なる水素原子もしくはアルキル基である。}
で表されるカルバシラトラン誘導体を含有することが特に好ましい。このようなカルバシラトラン誘導体として、以下の構造で表される1分子中にアルケニル基およびケイ素原子結合アルコキシ基を有するシラトラン誘導体が例示される。
上記のシリコーン系接着性シートは、例えば、架橋性シリコーン組成物の架橋物に対して剥離性を有する基材の間で該組成物を架橋させてなり、該基材の少なくとも一方が、該組成物に接する面に酸素原子および/または硫黄原子を有するものであることを特徴とする方法により製造可能である。この酸素原子および/または硫黄原子は前記同様である。
本発明にかかるシリコーン系接着シートは、半導体チップまたは半導体用ウェハをその取付部に接着する目的で使用されるものであることが好ましく、特に、MEMSデバイスに利用するダイアタッチフィルム用途であることが好ましい。ここで、MEMSデバイスとは、一般的にMicro Electro Mechanical Systemsと呼ばれる半導体微細加工技術を用いて形成された半導体装置の総称であり、MEMSチップを備えた加速度センサや角速度センサなどの慣性センサであってよい。また、半導体装置は公知のものが特に制限なく利用され、ダイオード、トランジスタ、サイリスタ、モノリシックIC、ハイブリッドIC、LSI、VLSIが例示され、これらの半導体装置(MEMSデバイス含む)の半導体チップを、本発明にかかるシリコーン系接着シートにより該チップ取付部に仮固定し、さらに加熱等により永久接着する用途に好適に利用できる。
上記のシリコーン系接着シートは、取扱作業性の見地から、当該シートに対して剥離性を有する基材間に挟持されており、かつ、少なくとも一方の基材が当該シートとの接触面に酸素原子または硫黄原子を有することを特徴とするシート状の積層体であり、半導体チップ用または半導体用ウェハ用のダイアタッチフィルムであることが好ましい。
このような積層体は、上記の半導体装置(特にMEMSデバイス等)の前駆体であり、端的には記のシリコーン系接着シートを介して、基材上に半導体チップまたは半導体用ウェハが配置された構造を有する積層体である。当該積層体はダイパッド等の回路基板上に、ダイシングにより個片化された半導体チップ(ダイ)が上記のシリコーン系接着シートを介して配置され、一時的に保持(仮固定)された構造を有する半導体装置の前駆体であってよく、特に、MEMSデバイスの前駆体であってよい。当該積層体全体を、例えば50℃以上に加熱することにより、上記のシリコーン系接着シートの硬化物により、基材上に半導体チップまたは半導体用ウェハが固定された構造を有する、半導体装置(好適には、MEMSデバイス)を得ることができる。なお、永久接着を発現させるための加熱温度や加熱時間は、前記同様である。
本発明のシリコーン系接着シートは、半導体装置(好適には、MEMSデバイス)の製造に適しており、以下の工程を有する、半導体装置の製造方法に用いられる。
工程1:上記のシリコーン系接着シートを半導体用ウェハの背面に積層する工程、
工程2:上記工程1で得た積層体をダイシングにより個片化する工程、
工程3:上記工程2で得た半導体用ウェハの個片を、シリコーン系接着シート面を介して半導体基材上に配置する工程
工程4:工程3で得た、半導体用ウェハの個片がシリコーン系接着シート面により半導体基材上に配置された構造体を50~200℃の範囲で加熱することにより、半導体用ウェハの個片をシリコーン系接着シートにより半導体基材上に接着する工程
工程1:上記のシリコーン系接着シートを半導体チップに近似した大きさに個片化する工程、
工程2:上記工程1で得た個片化したシリコーン系接着シートを半導体基材上に配置する工程
工程3:上記工程2で半導体基材上に配置された個片化したシリコーン系接着シート上に半導体チップを配置する工程
工程4:上記工程3で得た、半導体用チップがシリコーン系接着シート面により半導体基材上に配置された構造体を50~200℃の範囲で加熱することにより、半導体用チップをシリコーン系接着シートにより半導体基材上に接着する工程
以下、本発明に関して実施例を挙げて説明するが、本発明は、これらによって限定されるものではない。以下に示す実施例1~5および比較例1、2では下記の化合物ないし組成物を原料に用いた。なお、比較例3、4では、市販のシリコーン粘着剤製品をそのまま用いた。
[硬化性オルガノポリシロキサン組成物の成分]
(A1) 粘度2,000mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.23重量%)
(A2) 粘度40,000mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.08重量%)
(A3) 粘度400mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.44重量%)
(A4) 粘度80mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=1.50重量%)
(A5) 粘度2,000mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.23重量%)70重量%、SiO4/2単位と(CH3)3SiO1/2単位と(CH3)2(CH2=CH)SiO1/2単位からなるオルガノポリシロキサンレジン(ビニル基の含有量=2.5重量%)30重量%からなるシリコーンレジンポリシロキサン混合物
(A6)粘度20,000mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=1.75重量%)50重量部、SiO4/2単位と(CH3)3SiO1/2単位と(CH3)2(CH2=CH)SiO1/2単位からなるオルガノポリシロキサンレジン(ビニル基の含有量=4.1重量%)50重量%からなる、シリコーンレジンポリシロキサン混合物
(A7)粘度80mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=1.50重量%)20重量部、SiO4/2単位と(CH3)3SiO1/2単位と(CH3)2(CH2=CH)SiO1/2単位からなるオルガノポリシロキサンレジン(ビニル基の含有量=3.0重量%)80重量%からなる、シリコーンレジンポリシロキサン混合物
(A8) 粘度2,000mPa・sの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.23重量%)80重量部およびBET法による被表面積が200m2/gであるフュームドシリカ20重量部の混合物
(B1) 粘度60mPa・sの分子鎖両末端トリメチルシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体(ケイ素原子結合水素原子の含有量=0.7重量%)
(B2) 粘度15mPa・sの分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルポリシロキサン(ケイ素原子結合水素原子の含有量=0.12重量%)
(B3) 粘度23mPa・sの分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンポリシロキサン(ケイ素原子結合水素原子の含有量=1.55重量%)
(B4)SiO4/2単位とH(CH3)2SiO1/2単位からなる粘度25mPa・sのオルガノポリシロキサンレジン(ケイ素原子結合水素原子の含有量=0.97重量%)
(C1)粘度30mPa・sの分子鎖両末端水酸基封鎖ジメチルシロキサン-メチルビニルシロキサンコポリマーと3-グリシドキシプロピルトリメトキシシランとの質量比1:1の縮合反応物である接着付与剤
(D)白金濃度が0.6重量%である白金と1,3-ジビニル-1,1,3,3-テトラメチルジシロキサンの錯体
反応制御剤として下記(E)成分:
(E1) エチニルシクロヘキサノール
(E2) 1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサン
前記の各成分を下の表1に記載の重量比(重量部)で、成分(D)以外の各成分を均一に混合し、最後に成分(D)を表1に記載の重量比(重量部)で混合した。当該組成物を真空脱泡後、厚さ50μmのポリエーテルサルホン樹脂フィルムの間に挟み込み、クリアランスを調整したステンレス製の2本ロールにより、該組成物の厚さが80μmとなるよう調整し、100℃の熱風循環式オーブン中で30分間加熱することにより、該組成物を架橋させてなる実施例1~5、および比較例1,2のシリコーン系接着性シートを得た。なお、表1に、組成物中のビニル基(Vi)1モルに対するケイ素原子結合原子数(SiH)のモル数をモル比で示した。
(比較例4) 東レ・ダウコーニング製シリコーン粘着剤SD4584 FCを50μm厚のPETフィルムにコーティングし、120℃―5分間の条件で加熱硬化させ、厚さ80μmのシリコーンフィルムを得た。
[シリコーン系接着シートの表面タック性]
シリコーン系接着シート(20mm×20mm)を、シリコーン用両面テープ(日東電工製5302A)を用いてガラス(25mm×75mm)上に貼着して試験体を作成した。テクスチャーアナライザーの直径8mmのステンレス製プローブをシート表面に対し0.01mm/秒の速度で下降させ、50gfの荷重がかかってから0.5秒保持し、その後0.5mm/秒の速度でプローブを上昇させた。上昇時にプローブに対してかかる応力を測定した。測定時に極大値が得られたものを極大値有、極大値が得られなかったものを極大値無とし、測定中に得られた値の最大値をタック性(gf)とした。なお、極大値有のシリコーン性接着シートについては、全て、当該接着シートがプローブから界面剥離し、接着層の凝集破壊に伴う糊残り等は生じなかった。
ガラスに貼り付けたシリコーン系接着シートの上に2mm角のシリコンチップ(厚さ625um)を配置し、25℃のダイアタッチプレスで50gfの荷重を0.5秒間与えた。その後5分以内に100mmの高さから垂直に自然落下させた。シリコーン系接着シート表面からシリコンチップが剥がれたものを×、シート上に保持されていたものを○とした。また、シート上に保持されていたシリコンチップは、ステンレススチール製ピンセットで容易に界面剥離することができた。
シリコーン系接着シート (5mm×20mm)を、シリコンウェハ(30mm×30mm)上に貼着した後、これらを130℃のダイアタッチプレスにおいて3kgfで5分加熱する(=)ことにより、このフィルムを基材に接着させてなる試験体を作成した。これらの試験体におけるシリコーン系接着シートをステンレススチール製ピンセットで剥がすことにより、基材に対するフィルムの接着性を以下の基準により評価した。
○:加熱後の接着面を剥離した場合、接着面の過半において接着層の凝集破壊に伴う糊残りが発生した。
×:加熱後の接着面を剥離した場合、その接着面において、僅かな移行成分を除き、接着層が凝集破壊を伴わずに被着体との界面で剥離した。
実施例1~5、比較例1~2の試験結果から明らかなように、表面タック性試験で剥離モードが界面剥離かつ極大値を持つ挙動を示したシリコーン系接着シートは、シリコンチップの仮固定性に優れ、かつ100~200℃の範囲で3時間以内の加熱条件において、加熱後の永久接着性を発現する性質を併せ持つものであった。一方、比較例3~4のように、シリコーン粘着剤は良好な仮固定性を示すが、本願シリコーン系接着シートのように加熱後に永久接着性を示すものではなく、MEMSデバイスのような微細かつ高精度の半導体装置の生産効率を改善することができない。また、比較例1~2においては、表面タック性が不十分であり、シリコンチップの仮固定や一時的な配置に用いることは困難である。
Claims (17)
- 加熱前は、接着面の他の非粘着性基材からの剥離モードが界面剥離であり、当該接着面を50~200℃の範囲で加熱した後は、当該接着面の他の非粘着性基材からの剥離モードが凝集破壊に変化し、永久接着性を示す、シリコーン系接着シート。
- 請求項1のシリコーン系接着シートであって、テクスチャーアナライザーを用いて当該シートのいずれかの表面に対して、直径8mmのステンレス製プローブをシート表面に対し0.01mm/秒の速度で下降させ、50gfの荷重がかかってから0.5秒保持し、その後0.5mm/秒の速度でプローブを上昇させた際に、当該接着シートがプローブから界面剥離し、かつ、その接着力の極大値を示し、さらに、当該接着力の極大値を示す表面を100~200℃の範囲で3時間加熱した場合、当該接着面の他の非粘着性基材からの剥離モードが凝集破壊に変化し、永久接着性を示すことを特徴とするもの。
- 上記の接着力の極大値が10gf以上の値である、請求項1または請求項2に記載のシリコーン系接着シート。
- シートの厚みが5~1000μmの範囲である、請求項1~請求項3のいずれか1項に記載のシリコーン系接着シート
- 請求項1~請求項4のいずれか1項に記載のシリコーン系接着シートであって、当該シートに対して剥離性を有する基材間に挟持されており、かつ、少なくとも一方の基材が当該シートとの接触面に酸素原子または硫黄原子を有することを特徴とするもの。
- シリコーン系接着性シートが架橋性シリコーン組成物の架橋物であり、当該架橋物に対して剥離性を有する基材の間で該組成物を架橋させてなり、少なくとも一方の基材が当該組成物との接触面に酸素原子または硫黄原子を有することを特徴とする、請求項5のシリコーン系接着シート。
- 基材が有機樹脂からなるシート状基材であり、酸素原子が、カルボニル基、アルコキシ基、エステル基、およびエーテル基からなる群より選択される基を構成する原子であり、また、硫黄原子が、スルホン基、およびチオエーテル基からなる群より選択される基を構成する原子であることを特徴とする、請求項5または請求項6に記載のシリコーン系接着シート。
- 請求項1~請求項5のいずれか1項に記載のシリコーン系接着シートであって、以下の成分(A)~成分(D)を含む架橋性シリコーン組成物の架橋物であるもの:
(A)一分子中に少なくとも2個のケイ素原子結合アルケニル基を有するオルガノポリシロキサン、
(B)一分子中に少なくとも2個のケイ素原子結合水素原子を有するオルガノポリシロキサン、
(C)少なくとも一種の接着促進剤、および
(D)ヒドロシリル化反応用触媒 - 半導体チップまたは半導体用ウェハをその取付部に接着する目的で使用される、請求項1~請求項8のいずれか1項のシリコーン系接着シート
- 請求項1~請求項9のシリコーン系接着シートを含む、積層体。
- 半導体チップ用または半導体用ウェハ用のダイアタッチフィルムである、請求項10の積層体。
- シリコーン系接着シートを介して、基材上に半導体チップまたは半導体用ウェハが配置された構造を有する、請求項10の積層体。
- 請求項1~請求項9のシリコーン系接着シートの硬化物により、基材上に半導体チップまたは半導体用ウェハが固定された構造を有する、半導体装置。
- MEMS(micro electro mechanical systems)デバイスである、請求項13の半導体装置。
- 以下の工程を有する、半導体装置の製造方法。
工程1:請求項1~請求項9のシリコーン系接着シートを半導体用ウェハの背面に積層する工程、
工程2:上記工程1で得た積層体をダイシングにより個片化する工程、
工程3:上記工程2で得た半導体用ウェハの個片を、シリコーン系接着シート面を介して半導体基材上に配置する工程
工程4:工程3で得た、半導体用ウェハの個片がシリコーン系接着シート面により半導体基材上に配置された構造体を50~200℃の範囲で加熱することにより、半導体用ウェハの個片をシリコーン系接着シートにより半導体基材上に接着する工程 - 以下の工程を有する、半導体装置の製造方法。
工程1:請求項1~請求項9のシリコーン系接着シートを半導体チップに近似した大きさに個片化する工程、
工程2:上記工程1で得た個片化したシリコーン系接着シートを半導体基材上に配置する工程
工程3:上記工程2で半導体基材上に配置された個片化したシリコーン系接着シート上に半導体チップを配置する工程
工程4:上記工程3で得た、半導体用チップがシリコーン系接着シートにより半導体基材上に配置された構造体を50~200℃の範囲で加熱することにより、半導体用チップをシリコーン系接着シートにより半導体基材上に接着する工程 - 半導体装置がMEMS(micro electro mechanical systems)デバイスである、請求項15または請求項16に記載の半導体装置の製造方法。
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