WO2020136901A1 - 光硬化性粘着剤の評価方法、ダイシング・ダイボンディング一体型フィルム及びその製造方法、並びに半導体装置の製造方法 - Google Patents
光硬化性粘着剤の評価方法、ダイシング・ダイボンディング一体型フィルム及びその製造方法、並びに半導体装置の製造方法 Download PDFInfo
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- WO2020136901A1 WO2020136901A1 PCT/JP2018/048581 JP2018048581W WO2020136901A1 WO 2020136901 A1 WO2020136901 A1 WO 2020136901A1 JP 2018048581 W JP2018048581 W JP 2018048581W WO 2020136901 A1 WO2020136901 A1 WO 2020136901A1
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- adhesive layer
- sensitive adhesive
- dicing
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- pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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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
- 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
- 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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- 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
- H10P72/70—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
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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
- H10P72/70—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
- H10P72/7416—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
-
- 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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/071—Connecting or disconnecting
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/071—Connecting or disconnecting
- H10W72/073—Connecting or disconnecting of die-attach connectors
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/851—Dispositions of multiple connectors or interconnections
- H10W72/874—On different surfaces
- H10W72/884—Die-attach connectors and bond wires
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W74/00—Encapsulations, e.g. protective coatings
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W90/00—Package configurations
- H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
- H10W90/731—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors
- H10W90/734—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors between a chip and a stacked insulating package substrate, interposer or RDL
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W90/00—Package configurations
- H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
- H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
- H10W90/754—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between a chip and a stacked insulating package substrate, interposer or RDL
Definitions
- the present invention relates to a photocurable pressure sensitive adhesive evaluation method, a dicing/die bonding integrated film and its manufacturing method, and a semiconductor device manufacturing method.
- a dicing process for separating a semiconductor wafer into individual semiconductor chips and a die bonding process for adhering the separated semiconductor chips to a lead frame, a package substrate, etc. are usually provided.
- a dicing/die-bonding integrated film which is a combination of a die-bonding film having an adhesive layer used for adhesion, is mainly used.
- the dicing/die-bonding integrated film used for manufacturing a thin semiconductor chip is required to have a high success rate of pickup and a short peeling time in the pickup, and form a photocurable pressure-sensitive adhesive layer.
- the selection of photo-curable adhesive is important.
- JP-A-2003-338467 JP, 2004-017639 A JP, 2006-089521, A JP, 2006-266798, A JP, 2014-055250, A JP, 2014-181258, A JP, 2005-028146, A
- the present invention has been made in view of such circumstances, and its main object is to provide a new evaluation method for a photocurable pressure-sensitive adhesive used in a dicing/die-bonding integrated film.
- Factors that influence the releasability between the adherend and the adhesive include the adhesive strength of the adhesive (bulk property of the adhesive), the interaction at the interface between the adherend and the adhesive (surface property of the adhesive), etc. Can be mentioned. It is generally known that the bulk property contributes to the peeling property more than the surface property, and the peeling property tends to be controlled by adjusting the bulk property.
- the inventors of the present invention have made diligent studies and found that when the adherend and the pressure-sensitive adhesive were peeled off, a specific stringing phenomenon was observed more than when no stringing phenomenon was observed. In this case, it was found that the peeling progress was accelerated by the propagation of the breaking impact of the stringer, and the peeling speed was improved, and the present invention was completed.
- One aspect of the present invention provides a method for evaluating a photocurable pressure-sensitive adhesive used in a dicing/die-bonding integrated film.
- This photocurable pressure-sensitive adhesive evaluation method is a substrate layer, a photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive, and an adhesive layer are prepared in this order to prepare a dicing/die-bonding integrated film, Irradiate the photocurable pressure-sensitive adhesive layer with ultraviolet rays under the following irradiation conditions to form a cured product of the photocurable pressure-sensitive adhesive layer, and under the following peeling conditions, a cured product of the adhesive layer and the photocurable pressure-sensitive adhesive layer: The first step of measuring the peeling force when the film is peeled off, and the dicing/die bonding in which the base material layer, the photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive, and the adhesive layer are laminated in this order.
- Prepare a body film treat the photocurable pressure-sensitive adhesive layer under the following heating and cooling conditions, and irradiate the photocurable pressure-sensitive adhesive layer with ultraviolet rays under the following irradiation conditions to obtain a cured product of the photocurable pressure-sensitive adhesive layer.
- the adhesive layer and the cured product of the photocurable pressure-sensitive adhesive layer are peeled under the following peeling conditions, and the surface of the cured product of the photocurable pressure-sensitive adhesive layer after the adhesive layer is peeled off is scanned with a scanning probe microscope.
- the second step of measuring the number and width of traces of thread-plucking marks on the surface, and the quality of the photo-curable adhesive is determined based on the peeling force and the number and width of traces of plucking marks.
- a third step Irradiation conditions
- Irradiation intensity 70 mW/cm 2
- Integrated light intensity 150 mJ/cm 2
- Temperature 25 ⁇ 5°C
- Humidity 55 ⁇ 10% Peeling angle: 30° Peeling speed: 600 mm/min (heating and cooling conditions)
- Cooling treatment Air cooling to 25 ⁇ 5°C for 30 minutes
- Such a photo-curable pressure-sensitive adhesive evaluation method is to check in advance whether the photo-curable pressure-sensitive adhesive to be used as the photo-curable pressure-sensitive adhesive layer of the dicing/die-bonding integrated film has excellent pickup property. Useful for forecasting.
- the third step is a step of judging the quality of the photocurable pressure-sensitive adhesive based on whether or not the peeling force and the number and width of traces of the string-plucking traces satisfy the following conditions (a) and (b). Good.
- the median width of the thread-plucking marks is 120 to 200 nm.
- the photocurable pressure-sensitive adhesive contains a (meth)acrylic copolymer having a reactive functional group, a photopolymerization initiator, and a crosslinking agent having two or more functional groups capable of reacting with the reactive functional group.
- the (meth)acrylic copolymer may further contain a methacrylic acid monomer unit.
- the adhesive layer may contain an epoxy resin, an epoxy resin curing agent, and a (meth)acrylic copolymer having an epoxy group.
- the present invention on the substrate layer, a step of forming a photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive determined to be good in the above-mentioned photo-curable pressure-sensitive adhesive evaluation method, And a step of forming an adhesive layer on the photocurable pressure-sensitive adhesive layer, to provide a method for producing a dicing/die-bonding integrated film.
- the present invention provides a step of attaching an adhesive layer of a dicing/die-bonding integrated film obtained by the above-described manufacturing method to a semiconductor wafer, the semiconductor wafer, the adhesive layer, and the photocurable pressure-sensitive adhesive layer. Dicing into individual pieces, irradiating the photo-curable pressure-sensitive adhesive layer with ultraviolet rays to form a cured product of the photo-curable pressure-sensitive adhesive layer, and adhering from the cured product of the photo-curable pressure-sensitive adhesive layer.
- a method for manufacturing a semiconductor device which comprises a step of picking up a semiconductor element to which an agent layer is attached and a step of adhering the semiconductor element to a support substrate for mounting the semiconductor element via an adhesive layer.
- the thickness of the semiconductor wafer may be 35 ⁇ m or less.
- the dicing may be an application of stealth dicing.
- the present invention comprises a substrate layer, a photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive determined to be good in the above-mentioned photo-curable pressure-sensitive adhesive evaluation method, and an adhesive layer.
- a dicing/die bonding integrated film provided in this order is provided.
- a new evaluation method for a photocurable pressure-sensitive adhesive used in a dicing/die-bonding integrated film there is provided a dicing/die bonding integrated film and a method for producing the same, which is based on such a method for evaluating a photocurable pressure-sensitive adhesive. Further, according to the present invention, there is provided a method of manufacturing a semiconductor device using such a dicing/die bonding integrated film.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of an integrated dicing/die bonding film.
- FIG. 2 is a diagram showing an example of a shape image profile and a phase image profile of a surface of a cured product of a photocurable pressure-sensitive adhesive layer, FIG. 2( a) is a shape image profile, and FIG. 2( b) is , A phase image profile.
- FIG. 3 is a diagram showing an example of a cross-sectional profile of the surface of the cured product of the photocurable pressure-sensitive adhesive layer, FIG. 3( a) is a shape image profile, and FIG. 3( b) is FIG. 3) is a cross-sectional profile of the line drawing mark X taken along line iii-ii.
- FIG. 4 is a diagram showing an example of a cross-sectional profile of the surface of the cured product of the photocurable pressure-sensitive adhesive layer
- FIG. 4( a) is a shape image profile
- FIG. 4( b) is FIG. 4( a ).
- 4) is a cross-sectional profile of the line drawing mark Y taken along line iv-iv.
- FIG. 5 is a schematic cross-sectional view for explaining one embodiment of a method for manufacturing a semiconductor device, and FIGS. 5A, 5B, 5C, 5D, and 5E show each step. It is a schematic cross section which shows.
- FIG. 6 is a schematic cross-sectional view for explaining one embodiment of a method for manufacturing a semiconductor device, and FIGS. 6F, 6G, 6H, and 6I are schematic cross-sectional views showing each step. It is a figure.
- FIG. 7 is a schematic cross-sectional view showing an embodiment of a semiconductor device.
- the numerical range indicated by using “to” indicates the range including the numerical values before and after “to” as the minimum value and the maximum value, respectively.
- the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of another stepwise described numerical range.
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
- (meth)acrylate means acrylate or corresponding methacrylate.
- the “threading” is a modified form of the pressure-sensitive adhesive between the adherend and the pressure-sensitive adhesive, and when the pressure-sensitive adhesive is separated from the pressure-sensitive adhesive, It means a large deformation like a thread without being broken between and.
- “Threading mark” means that the adhesive is broken and partially contracted after the stringing occurs, that the adhesive is largely deformed and then partially contracted, or that the adhesive is irreversibly stretched or largely deformed. It means what is observed as a mark (projection) on the surface of the pressure-sensitive adhesive by being peeled off from the adherend and then partially contracted.
- the method for evaluating a photocurable pressure-sensitive adhesive used in the dicing/die-bonding integrated film is a base layer, a photocurable pressure-sensitive adhesive layer made of a photocurable pressure-sensitive adhesive, and an adhesive layer in this order.
- Prepare a laminated dicing/die-bonding integrated film irradiate the photocurable pressure-sensitive adhesive layer with ultraviolet light under specific irradiation conditions to form a cured product of the photocurable pressure-sensitive adhesive layer, and perform specific peeling.
- an adhesive layer are laminated in this order to prepare a dicing/die-bonding integrated film, treat the photocurable pressure-sensitive adhesive layer under specific heating and cooling conditions, and subject the photocurable pressure-sensitive adhesive layer to specific irradiation.
- UV light is irradiated under the conditions to form a cured product of the photocurable pressure-sensitive adhesive layer, and the adhesive layer and the cured product of the photocurable pressure-sensitive adhesive layer are separated under specific peeling conditions, and the adhesive layer is separated.
- a photocurable pressure-sensitive adhesive that is cured by irradiation with ultraviolet rays can be an evaluation target.
- a photocurable pressure-sensitive adhesive to be evaluated a (meth)acrylic copolymer having a reactive functional group, a photopolymerization initiator, and two or more functional groups capable of reacting with the reactive functional group are provided.
- a photocurable pressure-sensitive adhesive containing a crosslinking agent will be described.
- the (meth)acrylic copolymer having a reactive functional group is, for example, one or more types of (meth)acrylate monomer (a1) or (meth)acrylic acid, and one type having a reactive functional group. Alternatively, it can be obtained by copolymerizing two or more kinds of polymerizable compounds (a2).
- Examples of the (meth)acrylate monomer (a1) include linear or branched alkyl (meth)acrylate, alicyclic (meth)acrylate, aromatic (meth)acrylate, alkoxyalkyl (meth)acrylate, and alkoxy (poly). It may be at least one selected from the group consisting of alkylene glycol (meth)acrylate, alkoxyalkoxyalkyl (meth)acrylate, and dialkylaminoalkyl (meth)acrylate.
- linear or branched alkyl (meth)acrylate examples include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t- Examples thereof include butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, stearyl (meth)acrylate, lauryl (meth)acrylate, and tridecyl (meth)acrylate.
- alicyclic (meth)acrylate examples include cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentanyl (meth)acrylate and the like.
- aromatic (meth)acrylates examples include phenoxyethyl (meth)acrylate.
- alkoxyalkyl (meth)acrylates examples include ethoxyethyl (meth)acrylate and butoxyethyl (meth)acrylate.
- alkoxy(poly)alkylene glycol(meth)acrylate examples include methoxydiethylene glycol(meth)acrylate, ethoxydiethylene glycol(meth)acrylate, methoxytriethylene glycol(meth)acrylate, butoxytriethylene glycol(meth)acrylate, methoxydipropylene. Examples thereof include glycol (meth)acrylate.
- alkoxyalkoxyalkyl (meth)acrylates examples include 2-methoxyethoxyethyl (meth)acrylate and 2-ethoxyethoxyethyl (meth)acrylate.
- dialkylaminoalkyl (meth)acrylate examples include N,N-dimethylaminoethyl (meth)acrylate and N,N-diethylaminoethyl (meth)acrylate.
- the polymerizable compound (a2) may have at least one reactive functional group selected from the group consisting of a hydroxy group and an epoxy group. Since the hydroxy group and the epoxy group have good reactivity with the compound (b) having an isocyanate group or the like, they can be preferably used.
- the polymerizable compound (a2) preferably has a hydroxy group.
- Examples of the polymerizable compound (a2) having a hydroxy group as a reactive functional group include hydroxyalkyl such as 2-hydroxyethyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate. (Meth)acrylate etc. are mentioned.
- Examples of the polymerizable compound (a2) having an epoxy group as a reactive functional group include (meth)acrylate having an epoxy group such as glycidyl (meth)acrylate and 3,4-epoxycyclohexyl (meth)acrylate. ..
- the (meth)acrylic copolymer may contain (meth)acrylic acid as a monomer unit. Further, in addition to the (meth)acrylate monomer (a1) and the polymerizable compound (a2), another polymerizable compound may be contained as a monomer unit. Examples of other polymerizable compounds include aromatic vinyl compounds such as styrene and vinyltoluene.
- the (meth)acrylic copolymer having a reactive functional group may further have a chain-polymerizable functional group. That is, it may have a main chain made of a (meth)acrylic copolymer having a reactive functional group and a side chain containing a polymerizable double bond and bonded to the main chain.
- the side chain containing the polymerizable double bond may be a (meth)acryloyl group, but is not limited thereto.
- a (meth)acrylic copolymer having a chain-polymerizable functional group has a functional group that reacts with a reactive functional group of a (meth)acrylic copolymer having a reactive functional group and a chain-polymerizable functional group. It can be obtained by reacting one or more compounds (b) with each other to introduce a chain-polymerizable functional group into the side chain of the (meth)acrylic copolymer.
- Examples of the functional group that reacts with a reactive functional group include an isocyanate group and the like.
- compound (b) having an isocyanate group examples include 2-methacryloxyethyl isocyanate (for example, Showa Denko KK, trade name “Karenzu MOI”).
- the content of the compound (b) may be 0.3 to 1.5 mmol/g based on the (meth)acrylic copolymer having a reactive functional group.
- the acid value of the (meth)acrylic copolymer having a reactive functional group may be, for example, 0 to 150 mgKOH/g.
- the hydroxyl value of the (meth)acrylic copolymer having a reactive functional group may be, for example, 0 to 150 mgKOH/g.
- the acid value and the hydroxyl value are measured according to JIS K0070.
- the weight average molecular weight (Mw) of the (meth)acrylic copolymer having a reactive functional group may be 100,000 to 1,000,000, 200,000 to 800,000, or 300,000 to 700,000.
- the weight average molecular weight is a polystyrene conversion value using a calibration curve based on standard polystyrene by gel permeation chromatography (GPC).
- the photopolymerization initiator is not particularly limited as long as it initiates polymerization by irradiation with ultraviolet rays, and examples thereof include a photoradical polymerization initiator.
- the photoradical polymerization initiator include benzoin ketals such as 2,2-dimethoxy-1,2-diphenylethane-1-one; ⁇ -hydroxyketones such as 1-hydroxycyclohexylphenyl ketone; 2-benzyl-2- ⁇ -aminoketones such as dimethylamino-1-(4-morpholinophenyl)-butan-1-one; oximes such as 1-[4-(phenylthio)phenyl]-1,2-octadione-2-(benzoyl)oxime Ester; phosphine oxide such as bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide; 2,4,5-triarylimidazole diamine such as 2-(o-chloroph
- the content of the photopolymerization initiator may be 0.1 to 10 parts by mass or 0.5 to 5 parts by mass with respect to 100 parts by mass of the (meth)acrylic copolymer.
- the cross-linking agent is not particularly limited as long as it is a compound having two or more functional groups capable of reacting with the reactive functional group (epoxy group, hydroxy group, etc.) of the (meth)acrylic copolymer having a reactive functional group.
- the bond formed by the reaction between the cross-linking agent and the (meth)acrylic copolymer having a reactive functional group include an ester bond, an ether bond, an amide bond, an imide bond, a urethane bond, and a urea bond. ..
- cross-linking agent examples include compounds having two or more isocyanate groups in one molecule. When such a compound is used, it easily reacts with the reactive functional group of the (meth)acrylic copolymer, so that the tackiness and stringiness tend to be easily controlled.
- Examples of the compound having two or more isocyanate groups in one molecule include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylene diisocyanate, diphenylmethane-4, 4'-diisocyanate, diphenylmethane-2,4'-diisocyanate, 3-methyldiphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, dicyclohexylmethane-2,4'-diisocyanate, lysine isocyanate, etc. And the isocyanate compound of.
- Specific examples of the compound having two or more isocyanate groups in one molecule include polyfunctional isocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name “Coronate L”).
- the cross-linking agent may be a reaction product of the above-mentioned isocyanate compound and a polyhydric alcohol having two or more hydroxy groups in one molecule (isocyanate group-containing oligomer).
- examples of the polyhydric alcohol having two or more hydroxy groups in one molecule include ethylene glycol, propylene glycol, butylene glycol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, and 1 , 10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, glycerin, pentaerythritol, dipentaerythritol, 1,4-cyclohexanediol, 1,3-cyclohexanediol and the like.
- the crosslinking agent is a reaction product (isocyanate group-containing oligomer) of a polyfunctional isocyanate having two or more isocyanate groups in one molecule and a polyhydric alcohol having three or more hydroxy groups in one molecule. May be.
- isocyanate group-containing oligomer As a crosslinking agent, the photocurable pressure-sensitive adhesive layer 20 tends to form a denser crosslinked structure.
- the content of the cross-linking agent may be, for example, 3 to 50 mass% with respect to the total mass of the (meth)acrylic copolymer.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of an integrated dicing/die bonding film.
- the dicing/die-bonding integrated film 1 includes a base material layer 10, a photo-curable pressure-sensitive adhesive layer 20 made of a photo-curable pressure-sensitive adhesive, and an adhesive layer 30 laminated in this order.
- the base material layer 10 may be a known polymer sheet or film, and is not particularly limited as long as it is made of a material that can be expanded in the die bonding step.
- a material include crystalline polypropylene, amorphous polypropylene, high-density polyethylene, medium-density polyethylene, low-density polyethylene, ultra-low-density polyethylene, low-density linear polyethylene, polybutene, polymethylpentene, and other polyolefins; Ethylene-vinyl acetate copolymer; ionomer resin; ethylene-(meth)acrylic acid copolymer; ethylene-(meth)acrylic acid ester (random, alternating) copolymer; ethylene-propylene copolymer; ethylene-butene copolymer Polymers; ethylene-hexene copolymers; polyurethanes; polyesters such as polyethylene terephthalate and polyethylene na
- the base material layer 10 is made of polyethylene, polypropylene, polyethylene-polypropylene random copolymer, and polyethylene-from the viewpoint of properties such as Young's modulus, stress relaxation property, melting point, price, recycling of waste materials after use, and the like. It may have a surface containing at least one material selected from polypropylene block copolymers as a main component, and the surface is in contact with the photocurable pressure-sensitive adhesive layer 20.
- the base material layer 10 may be a single layer or a multilayer including two or more layers made of different materials.
- the base material layer 10 may be subjected to surface roughening treatment such as corona discharge treatment or mat treatment, if necessary, from the viewpoint of controlling the adhesion with the photo-curable pressure-sensitive adhesive layer 20 described later.
- the thickness of the base material layer 10 may be 70 to 120 ⁇ m or 80 to 100 ⁇ m. When the thickness of the base material layer 10 is 70 ⁇ m or more, damage due to expansion tends to be more suppressed. When the thickness of the base material layer 10 is 120 ⁇ m or less, the stress in the pickup easily reaches the adhesive layer, and the pickup property tends to be more excellent.
- the photocurable pressure-sensitive adhesive layer 20 is a layer made of the above-mentioned photocurable pressure-sensitive adhesive.
- the photocurable pressure-sensitive adhesive layer 20 is formed on the base material layer 10.
- a varnish for forming a photocurable pressure sensitive adhesive layer is prepared, and the varnish is applied to the base material layer 10 to obtain the varnish.
- the photo-curable pressure-sensitive adhesive layer 20 by removing the volatile components of the varnish, and coating the varnish on a release-treated film to remove the volatile components of the varnish to remove the volatile component of the photo-curable pressure-sensitive adhesive layer. 20 is formed, and the obtained photocurable pressure-sensitive adhesive layer 20 is transferred to the base material layer 10.
- the varnish for forming a photocurable pressure-sensitive adhesive layer comprises a (meth)acrylic copolymer having a reactive functional group, a photopolymerization initiator, and a crosslinking agent having two or more functional groups capable of reacting with the reactive functional group and an organic solvent.
- a (meth)acrylic copolymer having a reactive functional group, a photopolymerization initiator, and a cross-linking agent having two or more functional groups capable of reacting with the reactive functional group can be used. May be volatilized by.
- organic solvents examples include aromatic hydrocarbons such as toluene and xylene; cyclic ethers such as tetrahydrofuran and 1,4-dioxane; alcohols such as methanol, ethanol, ethylene glycol and propylene glycol; acetone, methyl ethyl ketone and methyl.
- Ketones such as isobutyl ketone and cyclohexanone; esters such as methyl acetate, ethyl acetate and ⁇ -butyrolactone; carbonic acid esters such as ethylene carbonate and propylene carbonate; ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether , Polyhydric alcohol alkyl ethers such as propylene glycol dimethyl ether; polyhydric alcohol alkyl ether acetates such as ethylene glycol monomethyl ether acetate and ethylene glycol monoethyl ether acetate; N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl Examples include amides such as 2-pyrrolidone. These may be used alone or in combination of two or more.
- the solid content concentration of the varnish may be 10 to 60% by weight, based on the total weight of the varnish.
- the thickness of the photocurable pressure-sensitive adhesive layer 20 may be, for example, 1 to 200 ⁇ m, 3 to 50 ⁇ m, or 5 to 30 ⁇ m.
- the adhesive layer 30 is a layer made of an adhesive.
- the adhesive is not particularly limited as long as it is an adhesive used in the field of die bonding film.
- an adhesive containing an epoxy resin, an epoxy resin curing agent, and a (meth)acrylic copolymer having an epoxy group will be described.
- the adhesive layer 30 made of such an adhesive it is possible to provide excellent adhesiveness between the chips and the substrate and between the chips, and to impart electrode embedding properties, wire embedding properties, and the like. In addition, it becomes possible to bond at low temperature in the die bonding process.
- epoxy resin examples include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, bisphenol A novolac type epoxy resin, bisphenol F novolac type epoxy resin.
- Dicyclopentadiene skeleton-containing epoxy resin Dicyclopentadiene skeleton-containing epoxy resin, stilbene type epoxy resin, triazine skeleton-containing epoxy resin, fluorene skeleton-containing epoxy resin, triphenolphenol methane type epoxy resin, biphenyl type epoxy resin, xylylene type epoxy resin, biphenylaralkyl type epoxy resin, Examples thereof include naphthalene type epoxy resins, polyfunctional phenols, and diglycidyl ether compounds of polycyclic aromatics such as anthracene. These may be used alone or in combination of two or more.
- the epoxy resin curing agent may be, for example, a phenolic resin.
- the phenol resin can be used without particular limitation as long as it has a phenolic hydroxyl group in the molecule.
- examples of the phenolic resin include phenols such as phenol, cresol, resorcin, catechol, bisphenol A, bisphenol F, phenylphenol and aminophenol, and/or naphthols such as ⁇ -naphthol, ⁇ -naphthol and dihydroxynaphthalene, and formaldehyde.
- a novolak type phenolic resin obtained by condensation or co-condensation with a compound having an aldehyde group such as, for example, allylated bisphenol A, allylated bisphenol F, allylated naphthalene diol, phenol novolac, phenols and the like, and Examples thereof include phenol aralkyl resin and naphthol aralkyl resin synthesized from naphthols and dimethoxyparaxylene or bis(methoxymethyl)biphenyl. These may be used alone or in combination of two or more.
- the (meth)acrylic copolymer having an epoxy group may be a copolymer prepared by adjusting glycidyl (meth)acrylate as a raw material in an amount of 0.5 to 6% by mass based on the resulting copolymer. .. When the amount is 0.5% by mass or more, high adhesive strength tends to be easily obtained, and when the amount is 6% by mass or less, gelation tends to be suppressed.
- the balance of glycidyl (meth)acrylate may be a mixture of alkyl (meth)acrylate having an alkyl group having 1 to 8 carbon atoms such as methyl (meth)acrylate and styrene and acrylonitrile.
- the alkyl (meth)acrylate may include ethyl (meth)acrylate and/or butyl (meth)acrylate.
- the mixing ratio of each component can be adjusted in consideration of the Tg (glass transition point) of the obtained (meth)acrylic copolymer having an epoxy group.
- Tg glass transition point
- the upper limit of Tg of the (meth)acrylic copolymer having an epoxy group may be, for example, 30°C.
- the weight average molecular weight of the (meth)acrylic copolymer having an epoxy group may be 100,000 or more, and may be 300,000 to 3,000,000 or 500,000 to 2,000,000. When the weight average molecular weight is 3,000,000 or less, deterioration of the filling property between the semiconductor chip and the supporting substrate tends to be controlled.
- the weight average molecular weight is a polystyrene conversion value using a calibration curve based on standard polystyrene by gel permeation chromatography (GPC).
- the adhesive may further contain a curing accelerator such as a tertiary amine, imidazoles, or quaternary ammonium salts, if necessary.
- a curing accelerator such as a tertiary amine, imidazoles, or quaternary ammonium salts, if necessary.
- the curing accelerator include 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-phenylimidazolium trimellitate. These may be used alone or in combination of two or more.
- the adhesive may further contain an inorganic filler, if necessary.
- an inorganic filler for example, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, aluminum nitride, aluminum borate whiskers, boron nitride, crystalline Examples thereof include silica and amorphous silica. These may be used alone or in combination of two or more.
- the adhesive layer 30 is formed on the photocurable pressure-sensitive adhesive layer 20.
- an adhesive layer-forming varnish is prepared, and the varnish is applied on a release-treated film to form an adhesive.
- a method of forming the layer 30 and transferring the obtained adhesive layer 30 to the photocurable pressure-sensitive adhesive layer 20 can be mentioned.
- the adhesive layer-forming varnish contains an epoxy resin, an epoxy resin curing agent, a (meth)acrylic copolymer having an epoxy group, and an organic solvent.
- the organic solvent may be the same as the organic solvent used in the varnish for forming a photocurable pressure-sensitive adhesive layer.
- the thickness of the adhesive layer 30 may be, for example, 1 to 300 ⁇ m, 5 to 150 ⁇ m, or 10 to 100 ⁇ m.
- the stringing can occur due to the interaction at the interface between the adhesive layer and the cured product of the photocurable pressure-sensitive adhesive layer. Therefore, one of the influencing factors of the stringing phenomenon is the type and content of the crosslinking agent. For example, when the content of the cross-linking agent is decreased, the number of traces of the thread-plucking marks tends to increase and the width of the traces of the thread-plucking marks tends to increase. Therefore, by adjusting the type and content of the cross-linking agent, it is possible to control the number and width of the line-plucking marks.
- the coating conditions can be mentioned.
- the coating conditions such as the coating speed, the coating temperature, and the air volume
- the number and width of the line-plucking traces can be controlled.
- a dicing/die-bonding integrated film for evaluation in which a base material layer, a photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive to be evaluated, and an adhesive layer are laminated in this order is prepared. ..
- the types of the base material layer, the photo-curable pressure-sensitive adhesive layer, and the adhesive layer are not particularly limited, and an arbitrarily selected dicing/die-bonding integrated film should be used.
- the thickness of the photo-curable pressure-sensitive adhesive composed of the photo-curable pressure-sensitive adhesive that is the object of evaluation can be set to 10 ⁇ m, for example.
- the thickness of the adhesive layer may be 10 ⁇ m, for example.
- the photocurable adhesive layer is irradiated with ultraviolet rays under the following irradiation conditions to form a cured product of the photocurable adhesive layer.
- the ultraviolet light source can be appropriately selected depending on the type of photopolymerization initiator used.
- the light source of ultraviolet light is not particularly limited, but may be one kind selected from the group consisting of a low pressure mercury lamp, a far ultraviolet lamp, an excimer ultraviolet lamp, a high pressure mercury lamp, and a metal halide lamp. Of these, the ultraviolet light source is preferably a high pressure mercury lamp having a central wavelength of 365 nm. Further, in the irradiation of ultraviolet rays, a cold mirror or the like may be used together in order to reduce the influence of heat emitted from the light source.
- the irradiation temperature under UV irradiation conditions may be 60°C or lower or 40°C or lower.
- a dicing/die-bonding integrated film for evaluation in which a base material layer, a photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive to be evaluated, and an adhesive layer are laminated in this order is prepared. ..
- the evaluation dicing/die-bonding integrated film in the second step may be the same as the evaluation dicing/die-bonding integrated film in the first step, but the peeling force in the first step is measured. Use what is not.
- the photo-curable pressure-sensitive adhesive layer of the dicing/die-bonding integrated film for evaluation is treated under the following heating and cooling conditions. If the photocurable pressure-sensitive adhesive layer is not treated under heating and cooling conditions, the adhesiveness between the photocurable pressure-sensitive adhesive layer and the adhesive layer may be insufficient, and the cured product of the adhesive layer and the photocurable pressure-sensitive adhesive layer When the and are peeled off, the stringing marks tend to be difficult to be observed.
- the heating/cooling conditions described below assume a wafer laminating process for a semiconductor device, and tend to cause stringing marks to be more easily observed.
- the heat treatment under heating and cooling conditions is preferably performed from the side of the base material layer using a heater or the like.
- the base material layer a material that does not cause deformation such as wrinkles and sagging by heat treatment (65° C., 15 minutes).
- heat treatment it is preferable that the evaluation dicing/die bonding integrated film is heated while being suppressed by a cloth or the like that can withstand heating so as not to bend.
- the surface pressure at this time may be about 0.1 g/cm 2 . If the surface pressure is too high, the photocurable pressure-sensitive adhesive layer and the adhesive layer may adhere to each other more than necessary, and excessive stringing marks may be formed. In order to prevent curing of the photocurable pressure-sensitive adhesive layer, it is preferable to perform the treatment while shielding light.
- the photocurable pressure-sensitive adhesive layer is irradiated with ultraviolet rays under the same irradiation conditions as in the first step to form a cured product of the photocurable pressure-sensitive adhesive layer, and the adhesive layer is formed in the same manner as in the first step.
- the adhesive layer and the cured product of the photocurable pressure-sensitive adhesive layer are peeled off by pulling under the peeling condition of.
- the base material layer including the cured product of the photocurable pressure-sensitive adhesive layer after the adhesive layer is peeled off is collected as a measurement sample.
- the cured product of the photocurable pressure-sensitive adhesive layer after the adhesive layer is peeled off is collected so as not to be contaminated.
- the base material layer provided with the cured product of the photocurable pressure-sensitive adhesive layer after the adhesive layer has been peeled is cut into a size of 5 mm ⁇ 5 mm to obtain a measurement sample.
- the probe of the scanning probe microscope is preferably provided with a cantilever having a low spring constant, which is optimal for measuring the surface of the cured product of the photocurable adhesive layer after the adhesive layer is peeled off. .. Further, it is preferable that the observation with the scanning probe microscope is performed in the dynamic force mode (DFM).
- DFM dynamic force mode
- the stringing marks are observed as marks (protrusions) on the surface of the cured product of the photocurable pressure-sensitive adhesive layer, and data of the phase image of the surface of the cured product of the photocurable pressure-sensitive adhesive layer are acquired, In the phase image, a portion where the hardness is obviously different from the surrounding can be used as the string-plucking mark.
- the number of traces of the stringing mark is the number of places where the hardness is clearly different from the surroundings in the phase image.
- the width of the stringing trace can be obtained as follows. First, using a scanning probe microscope, the shape image profile and the phase image profile of the surface of the cured product of the photocurable pressure-sensitive adhesive layer including the portion where the hardness is apparently different from the surroundings are acquired.
- FIG. 2 is a diagram showing an example of a shape image profile and a phase image profile of a surface of a cured product of a photocurable pressure-sensitive adhesive layer
- FIG. 2( a) is a shape image profile
- FIG. 2( b) is , A phase image profile.
- FIG. 2( a) is a shape image profile
- FIG. 2( b) is , A phase image profile.
- the stringing trace is observed as a graph in which the raised portion is convex upward and is shown in the lightest color (for example, white in the case of a monochrome image).
- the phase difference being smaller than the surroundings means that the phase difference is harder than the surroundings.
- the thread-plucking traces are observed as locations where the phase difference from the surroundings is 50% or less than the surroundings because the photo-curable adhesive layer is stretched to the limit, and the most It is shown in a dark color (for example, black in the case of a monochrome image). In this way, the stringing marks can be observed not only from the shape image profile but also from the phase image profile.
- FIG. 3 is a diagram showing an example of a cross-sectional profile of the surface of the cured product of the photocurable pressure-sensitive adhesive layer
- FIG. 3( a) is a shape image profile
- FIG. 3( b) is FIG. 3) is a cross-sectional profile of the line drawing mark X taken along line iii-iii.
- FIG. 3B is a cross-sectional profile in the case where there is substantially no difference in the height of both ends of the observed thread-plucking trace (for example, 1 nm or less).
- the width Wx between both ends (minimum value) of the thread pulling trace X can be set as the width of the thread pulling trace X.
- FIG. 4 is a diagram showing an example of a cross-sectional profile of the surface of the cured product of the photocurable pressure-sensitive adhesive layer
- FIG. 4A is a shape image profile
- FIG. 4B is FIG. It is the iv-iv line cross-sectional profile of the stringing trace Y in (a).
- the end (minimum value) whose height is closer to the apex of the thread pulling trace Y can be set as the reference height Hy
- the width Wy at the reference height Hy can be set as the trace width of the thread pulling trace Y.
- ⁇ Third step> the quality of the photocurable pressure-sensitive adhesive is judged based on the peeling force and the number and width of traces of the string-plucking traces.
- the criteria of the peeling force, the number of traces of the line-plucking traces, and the width of the traces, which are the evaluation criteria, can be appropriately set according to the thickness of the semiconductor wafer and the like.
- the third step is a step of judging the quality of the photocurable pressure-sensitive adhesive based on whether or not the peeling force and the number and width of traces of the string-plucking traces satisfy the following conditions (a) and (b).
- Good A dicing/die-bonding integrated film including a photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive that satisfies the following conditions (a) and (b) is a semiconductor wafer having a relatively small thickness (for example, 35 ⁇ m or less). Can be suitably used for the dicing process applied to (for example, stealth dicing).
- the peeling force under the condition (a) may be 0.65 N/25 mm or less or 0.63 N/25 mm or less.
- the lower limit of the peeling force under the condition (a) is not particularly limited, but may be 0.10 N/25 mm or more.
- the presence of a specific region on the surface of the cured product of the photocurable pressure-sensitive adhesive layer after the adhesive layer has been peeled off tends to improve the stress propagation property and improve the peeling speed.
- the number of traces of the stringing present in the specific region may be 15 or more or 20 or more, and 70 or less, 60 or less, or 50 or less.
- the peeling speed is contributed by both the existence of the specific region and the width of the string piercing marks existing in the specific region.
- the number of traces of the string-plucking traces is 15 or more in the specific region, the stress propagation property is high and the peeling speed tends to be promoted.
- the specific region if the number of traces of the string-plucking traces is 70 or less, it tends to be possible to prevent the peeling force from increasing excessively.
- the scratch marks existing in these specific areas Calculate the median of the scar width.
- the median means a value located at the center when a finite number of data are arranged in ascending order, and when the data is an even number, it means an average value of values close to the center.
- the trace width of the 8th string-pulling trace when the trace widths of the string-pulling traces are arranged in ascending order is the median value
- the number of traces of the string-pulling trace is 16
- the average value of the trace widths of the eighth and the ninth pulling marks when the trace widths of the pulling marks are arranged in ascending order is the median value.
- the median width of the thread-plucking marks existing in the specific region may be 130 nm or more or 150 nm or more, and 190 nm or less or 180 nm or less.
- the median value of the widths of the string-pulling marks existing in the specific region is 120 nm or more, the breaking impact of the string-pulling is easily propagated, and the peeling speed tends to be improved.
- the median value of the widths of the thread-plucking marks existing in the specific region is 200 nm or less, the thread-pulling is likely to break and the peeling speed tends to be improved.
- a method for producing a dicing/die-bonding integrated film is a photocurable adhesive comprising a photocurable adhesive determined to be good by the above-mentioned photocurable adhesive evaluation method on a base material layer. And a step of forming an adhesive layer on the photo-curable pressure-sensitive adhesive layer.
- the base material layer and the adhesive layer may be the same as those exemplified in the above-mentioned evaluation method for the photocurable pressure-sensitive adhesive.
- the method for forming the photocurable pressure-sensitive adhesive layer and the method for forming the adhesive layer may be the same as the method exemplified in the above-mentioned evaluation method for the photocurable pressure-sensitive adhesive.
- the dicing/die-bonding integrated film is a substrate layer, and a photo-curable pressure-sensitive adhesive layer made of a photo-curable pressure-sensitive adhesive that is determined to be good by the above-described photo-curable pressure-sensitive adhesive evaluation method, An adhesive layer is provided in this order.
- the base material layer and the adhesive layer may be the same as those exemplified in the above-mentioned evaluation method for the photocurable pressure-sensitive adhesive.
- FIG. 5 and 6 are schematic cross-sectional views for explaining one embodiment of a method for manufacturing a semiconductor device.
- the semiconductor device manufacturing method according to the present embodiment includes a step (wafer laminating step) of attaching the adhesive layer 30 of the dicing/die-bonding integrated film 1 obtained by the above-described manufacturing method to the semiconductor wafer W2, and a semiconductor wafer W2.
- a step of dicing the adhesive layer 30 and the photocurable pressure-sensitive adhesive layer 20 into pieces (dicing step), a step of irradiating the photocurable pressure-sensitive adhesive layer 20 with ultraviolet rays (ultraviolet ray irradiation step), and a substrate
- a step of picking up a semiconductor element (semiconductor element 50 with an adhesive layer) to which the adhesive layer 30a is attached from the layer 10 (pickup step), and mounting the semiconductor element 50 with an adhesive layer on the semiconductor element via the adhesive layer 30a.
- a step of adhering to the supporting substrate 60 (semiconductor element adhering step).
- the dicing in the dicing process is not particularly limited, and examples thereof include blade dicing, laser dicing, stealth dicing and the like.
- the dicing may be stealth dicing.
- stealth dicing is mainly used as the dicing will be described in detail.
- the method for manufacturing a semiconductor device may include a modified layer forming step before the wafer laminating step.
- a semiconductor wafer W1 having a thickness H1 is prepared.
- the thickness H1 of the semiconductor wafer W1 forming the modified layer may exceed 35 ⁇ m.
- the protective film 2 is attached to one main surface of the semiconductor wafer W1 (see FIG. 5A).
- the surface to which the protective film 2 is attached is preferably the circuit surface of the semiconductor wafer W1.
- the protective film 2 may be a back grinding tape used for back surface grinding (back grinding) of a semiconductor wafer.
- the modified layer 4 is formed by irradiating the inside of the semiconductor wafer W1 with a laser beam (see FIG. 5B), and the side of the semiconductor wafer W1 opposite to the side to which the protective film 2 is attached (back side).
- the semiconductor wafer W2 having the modified layer 4 is manufactured by performing back grinding (back surface grinding) and polishing (polishing) on the above (see FIG. 5C).
- the thickness H2 of the obtained semiconductor wafer W2 may be 35 ⁇ m or less.
- the adhesive layer 30 of the dicing/die bonding integrated film 1 is placed in a predetermined device. Then, the dicing/die bonding integrated film 1 is attached to the main surface Ws of the semiconductor wafer W2 via the adhesive layer 30 (see FIG. 5D), and the protective film 2 of the semiconductor wafer W2 is peeled off ( See FIG. 5(e).
- the photocurable adhesive layer 20 is cured by irradiating the photocurable adhesive layer 20 with ultraviolet rays to form a cured product of the photocurable adhesive layer (see FIG. 6G). Thereby, the adhesive force between the photocurable pressure-sensitive adhesive layer 20 and the adhesive layer 30 can be reduced.
- ultraviolet rays it is preferable to use ultraviolet rays having a wavelength of 200 to 400 nm.
- the ultraviolet irradiation conditions are preferably adjusted so that the illuminance is 30 to 240 mW/cm 2 and the irradiation amount is 200 to 500 mJ/cm 2 .
- the base material layer 10 is expanded to separate the diced semiconductor elements 50 with an adhesive layer from each other, while sucking the semiconductor element 50 with an adhesive layer pushed up by the needle 42 from the base material layer 10 side. It is sucked by the collet 44 and picked up from the cured product 20ac of the photocurable pressure-sensitive adhesive layer (see FIG. 6(h)).
- the semiconductor element 50 with the adhesive layer has the semiconductor element Wa and the adhesive layer 30a.
- the semiconductor element Wa is obtained by dividing the semiconductor wafer W2 by dicing
- the adhesive layer 30a is obtained by dividing the adhesive layer 30 by dicing.
- the cured product 20ac of the photocurable adhesive layer is obtained by dividing the cured product of the photocurable adhesive layer by dicing.
- the cured product 20ac of the photocurable pressure-sensitive adhesive layer may remain on the base material layer 10 when the semiconductor element 50 with the adhesive layer is picked up. In the pickup process, it is not always necessary to expand, but the expandability can be further improved by expanding.
- the amount of thrust by the needle 42 can be set appropriately. Further, for example, two-stage or three-stage pickup may be performed from the viewpoint of ensuring a sufficient pickup property even for an extremely thin wafer.
- the semiconductor element 50 with the adhesive layer may be picked up by a method other than the method using the suction collet 44.
- the semiconductor element 50 with an adhesive layer is bonded to the semiconductor element mounting support substrate 60 via the adhesive layer 30a by thermocompression bonding (see FIG. 6(i)). ..
- a plurality of adhesive layer-equipped semiconductor elements 50 may be bonded to the semiconductor element mounting support substrate 60.
- FIG. 7 is a sectional view schematically showing an embodiment of a semiconductor device.
- the semiconductor device 100 shown in FIG. 7 includes the above steps, the step of electrically connecting the semiconductor element Wa and the semiconductor element mounting support substrate 60 by wire bonds 70, and the step of electrically connecting the semiconductor element Wa and the semiconductor element mounting support substrate 60 on the surface 60 a of the semiconductor element mounting support substrate 60. And a step of resin-sealing the semiconductor element Wa using the resin sealing material 80.
- Solder balls 90 may be formed on the surface of the semiconductor element mounting support substrate 60 opposite to the surface 60a for electrical connection with an external substrate (motherboard).
- the acid value and hydroxyl value of the (meth)acrylic copolymer in the (meth)acrylic copolymer solutions A to E were measured according to JIS K0070. The results are shown in Table 1. Further, the obtained acrylic resin was vacuum dried at 60° C. overnight, and the obtained solid content was subjected to elemental analysis by a fully automatic elemental analyzer varioEL manufactured by Elemental Co., Ltd. The content of methacryloxyethyl isocyanate was calculated. The results are shown in Table 1. Further, using SD-8022/DP-8020/RI-8020 manufactured by Tosoh Corporation as a GPC device, Gelpack GL-A150-S/GL-A160-S manufactured by Hitachi Chemical Co., Ltd. as a column, and tetrahydrofuran as an eluent, The weight average molecular weight (Mw) in terms of polystyrene was measured. The results are shown in Table 1.
- ⁇ Production Example 1 Preparation of dicing/die bonding integrated film A> (Production of dicing film) 100 parts by mass of the (meth)acrylic copolymer solution A prepared above as a (meth)acrylic copolymer having a reactive functional group as a solid content, 1-hydroxycyclohexyl phenyl ketone (Ciba Specialty Chemicals) as a photopolymerization initiator 0.5 g by weight of Irgacure 184) manufactured by Co., Ltd., and 2 parts by weight of a polyfunctional isocyanate (trade name “Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd., solid content: 75%) as a cross-linking agent were mixed.
- a polyfunctional isocyanate trade name “Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd., solid content: 75%
- Ethyl acetate was added to this mixture so that the total solid content was 25% by mass, and the mixture was uniformly stirred for 10 minutes to obtain a varnish for forming a photocurable pressure-sensitive adhesive layer.
- the thickness of the photocurable pressure-sensitive adhesive layer after drying was applied to a polyethylene terephthalate (PET) film having a width of 350 mm, a length of 400 mm, and a thickness of 38 ⁇ m, the one side of which was subjected to mold release treatment. Of 10 ⁇ m was applied while adjusting the gap, and the varnish for forming a photocurable pressure-sensitive adhesive layer was heated and dried at 80 to 100° C. for 3 minutes.
- PET polyethylene terephthalate
- a polyolefin film (base material layer, thickness: 90 ⁇ m) that has been subjected to a corona discharge treatment on one side is bonded, cured at 40° C. for 72 hours, and subjected to a crosslinking treatment to form a base material layer.
- the dicing film provided with the photocurable adhesive layer was obtained.
- the cross-linking treatment was performed while confirming the progress of curing by using FT-IR spectrum.
- NUCA-189 manufactured by Nippon Unicar Co., Ltd., trade name, ⁇ - 1.7 parts by mass of mercaptopropyltrimethoxysilane
- NUCA-1160 manufactured by Nippon Unicar Co., Ltd., trade name, ⁇ -ureidopropyltriethoxysilane
- Aerosil R972 as a filler (silica surface is dimethyldi).
- HTR-860P-3 manufactured by Nagase Chemtex Co., Ltd., trade name, acrylic rubber containing a weight-average molecular weight of 800,000, glycidyl acrylate or 3% by mass of glycidyl methacrylate
- Curezol 2PZ-CN manufactured by Shikoku Kasei Co., Ltd., trade name, 1-cyanoethyl-2-phenylimidazole
- the obtained varnish for forming an adhesive layer is applied on a polyethylene terephthalate (PET) film which has been subjected to a release treatment so as to have a set thickness, and is heated and dried at 140° C. for 5 minutes to have a B stage state of 10 ⁇ m in thickness.
- PET polyethylene terephthalate
- the adhesive layer was formed, and a die bonding film including the adhesive layer was produced.
- the die bonding film produced above was cut into a size that was easy to handle together with the PET film.
- the PET film was peeled off and the photocurable pressure-sensitive adhesive layer of the dicing film was bonded to the adhesive layer of the cut die bonding film immediately before bonding.
- the bonding was performed in a clean room (23° C., 50% humidity-free room) using a laminating machine without heating the roll (that is, 23° C.).
- the dicing/die-bonding integrated film A was obtained by storing the film in a refrigerator at 4° C. for 1 day.
- ⁇ Production Example 7 Production of dicing/die-bonding integrated film G> Dicing/die-bonding integrated film in the same manner as in Production Example 1 except that the (meth)acrylic copolymer solution was changed from A to D and the content of the crosslinking agent was changed from 8 parts by mass to 6 parts by mass. Got G.
- ⁇ Manufacturing Example 12 Preparation of dicing/die-bonding integrated film L>
- the PET film of the dicing film was peeled off in a clean room (temperature 23°C, humidity 50% in a dust-free room), and the photocurable pressure-sensitive adhesive layer was exposed to air and left for 1 day or more.
- a dicing/die-bonding integrated film L was obtained in the same manner as in Production Example 1 except that the above was attached to the adhesive layer of the die-bonding film.
- the dicing/die-bonding integrated films A to M are each cut into a width of 30 mm and a length of 200 mm, the PET film on the adhesive layer side of the die bonding film is peeled off, and a supporting film (EC tape manufactured by Oji Tuck Co., Ltd.) is used as an adhesive. It stuck on the layer side using a roller and cut out to width 25 mm and length 170 mm.
- a supporting film EC tape manufactured by Oji Tuck Co., Ltd.
- the dicing/die-bonding integrated film was the same as the one used in the measurement of the peeling force, and the one in which the peeling force was not measured was used.
- the dicing/die bonding integrated films A to M were cut into a width of 30 mm and a length of 50 mm or more.
- a heater was brought into contact with the base material layer (polyolefin film) of the dicing/die-bonding integrated film to heat the photocurable pressure-sensitive adhesive layer at 65° C. for 15 minutes, and then air-cooled to 25 ⁇ 5° C.
- the PET film on the adhesive layer side of the die bonding film was peeled off, a supporting film (EC tape manufactured by Oji Tuck Co., Ltd.) was attached, and the width was cut to 25 mm. Then, from the base material layer (polyolefin film) side of the dicing die-bonding integrated film with a supporting film after heating and cooling, an ultraviolet irradiation device (GS Yuasa Co., Ltd., UV SYSTEM, central wavelength 365 nm ultraviolet light) is used. , irradiation temperature 40 ° C.
- the support film is pulled, the adhesive layer and the cured product of the photocurable pressure-sensitive adhesive layer are peeled off, and the base material layer comprising the cured product of the photocurable pressure-sensitive adhesive layer after the adhesive layer is peeled off is recovered, A measurement sample was obtained by cutting into a size of 5 mm ⁇ 5 mm.
- the dynamic force mode (DFM) is observed, and at the same time, the data of the phase image is acquired, and in the phase image, the part where the hardness is obviously different from the surroundings is threaded. It was a tow mark. In the observation of the measurement sample, it was confirmed whether or not there was a 25 ⁇ m ⁇ 25 ⁇ m region (specific region) in which the number of traces of the string-plucking marks was 15 or more on the surface to be observed.
- the width of the thread-plucking marks existing in the specific area The median value of was calculated.
- the trace width of the stringing trace was determined as follows. First, using a scanning probe microscope, the shape image profile and the phase image profile of the surface of the cured product of the photocurable pressure-sensitive adhesive layer including the portion where the hardness is clearly different from the surroundings in the phase image were acquired.
- the width of each thread pulling trace is The maximum cross-sectional profile of the cross-sectional line was output, and the trace width of the string-plucking trace was determined based on the above criteria.
- the thread-plucking marks are shown in the lightest color (for example, white in the case of a black-and-white image), but the number of places where the hardness is obviously different from the surroundings in the phase image is the shape image. The number was the same as the number of places indicated by the lightest color in the profile. The results are shown in Tables 2, 3, and 4.
- ⁇ Preparation of evaluation sample> (Formation of modified layer) A back grinding tape was attached to one surface of a semiconductor wafer (silicon wafer (thickness 750 ⁇ m, outer diameter 12 inches)) to obtain a semiconductor wafer with a back grinding tape. The surface of the semiconductor wafer opposite to the side to which the back grinding tape was attached was irradiated with laser light to form a modified layer inside the semiconductor wafer.
- the laser irradiation conditions are as follows.
- Laser oscillator model Semiconductor laser pumped Q-switch solid-state laser Wavelength: 1342 nm Oscillation form: pulse Frequency: 90 kHz Output: 1.7W Moving speed of semiconductor wafer mounting table: 700 mm/sec
- the PET film of the dicing/die bonding integrated film was peeled off from the surface of the semiconductor wafer opposite to the side to which the back grinding tape was stuck, and the adhesive layer was stuck.
- the dicing/die-bonding integrated film-equipped semiconductor wafer having the modified layer was fixed to an expanding device.
- the dicing film was expanded under the following conditions to separate the semiconductor wafer, the adhesive layer, and the photocurable pressure-sensitive adhesive layer into individual pieces.
- Cool expanding conditions Temperature: -15°C, Height: 9 mm, Cooling time: 90 seconds, Speed: 300 mm/second, Standby time: 0 seconds
- Heat shrink condition Temperature: 220°C, height: 7 mm, holding time: 15 seconds, speed: 30 mm/sec, heater speed: 7°C/sec
- UV irradiation The center wavelength of 365nm ultraviolet irradiation with a light-curable pressure-sensitive adhesive layer of the singulated semiconductor wafer irradiation intensity 70 mW / cm 2 and cumulative light quantity 150 mJ / cm 2, to form a cured product of the photocurable pressure-sensitive adhesive layer As a result, a sample for evaluation of pickup property described later was obtained.
- a die bonder DB-830P manufactured by Fasford Technology Co., Ltd. (former Hitachi High-Technologies Corporation) was used to perform a pick-up test with 9 pins.
- the pick-up collet was a RUBBER TIP 13-087E-33 (micro).
- the push-up pin was EJECTOR NEEDLE SEN2-83-05 (manufactured by Micromechanics company, product name, diameter: 0.7 mm, tip shape: diameter 350 ⁇ m)
- the semi-circle was used.
- the thrust pins were arranged at equal intervals from the center of the pin.
- the high-speed camera MEMRECM GX-1Plus manufactured by NAC Image Technology Co., Ltd., trade name
- the time until complete peeling was evaluated as the peeling time.
- Pickup was performed by pushing up to 300 ⁇ m at 1 mm/sec.
- the frame rate was 1000 frames/second.
- the peeling time of 60 msec or less was evaluated as "A”
- the peeling time of more than 60 msec and less than 90 msec was evaluated as "B”
- the peel time of more than 90 msec was evaluated as "C”.
- the results are shown in Tables 2, 3, and 4.
- the dicing/die-bonding integrated films A to E of Production Examples 1 to 5 have a peeling force of 0.70 N/25 mm or less, and the adhesive layer peels off.
- the surface of the cured product of the photocurable pressure-sensitive adhesive layer after being treated has a region of 25 ⁇ m ⁇ 25 ⁇ m in which the number of traces of the thread-plucking marks is 15 or more, and the median value of the width of the traces of the thread-plucking marks in the area is 120 to It was 200 nm, and both the condition (a) and the condition (b) were satisfied. It was found that the dicing/die-bonding integrated films A to E of Production Examples 1 to 5 were excellent in evaluation of pickup property.
- SYMBOLS 1 Dicing/die-bonding integrated film, 2... Protective film, 4... Modification layer, 10... Base material layer, 20... Photocurable adhesive layer, 20ac... Cured product of photocurable adhesive layer, 30, 30a... Adhesive layer, 42... Needle, 44... Suction collet, 50... Adhesive layer-equipped semiconductor element, 60... Support substrate for mounting semiconductor element, 70... Wire bond, 80... Resin encapsulant, 90... Solder ball, W1, W2... Semiconductor wafer, H1... Thickness of semiconductor wafer W1, H2... Thickness of semiconductor wafer W2, 100... Semiconductor device.
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Abstract
Description
(照射条件)
照射強度:70mW/cm2
積算光量:150mJ/cm2
(剥離条件)
温度:25±5℃
湿度:55±10%
剥離角度:30°
剥離速度:600mm/分
(加熱冷却条件)
加熱処理:65℃、15分間
冷却処理:25±5℃まで30分間空冷静置
条件(a):剥離力が0.70N/25mm以下である。
条件(b):接着剤層が剥離された後の光硬化性粘着剤層の硬化物の表面に、糸曳き痕の痕数が15以上である25μm×25μmの領域が存在し、領域内における糸曳き痕の痕幅の中央値が120~200nmである。
一実施形態に係るダイシング・ダイボンディング一体型フィルムに用いられる光硬化性粘着剤の評価方法は、基材層、光硬化性粘着剤からなる光硬化性粘着剤層、及び接着剤層がこの順に積層されたダイシング・ダイボンディング一体型フィルムを準備し、光硬化性粘着剤層に対して特定の照射条件で紫外線を照射して、光硬化性粘着剤層の硬化物を形成し、特定の剥離条件で接着剤層と光硬化性粘着剤層の硬化物とを剥離させたときの剥離力を測定する第1の工程と、基材層、光硬化性粘着剤からなる光硬化性粘着剤層、及び接着剤層がこの順に積層されたダイシング・ダイボンディング一体型フィルムを準備し、光硬化性粘着剤層を特定の加熱冷却条件で処理し、光硬化性粘着剤層に対して特定の照射条件で紫外線を照射して、光硬化性粘着剤層の硬化物を形成し、特定の剥離条件で接着剤層と光硬化性粘着剤層の硬化物とを剥離させ、接着剤層が剥離された後の光硬化性粘着剤層の硬化物の表面を走査型プローブ顕微鏡で観察し、表面における糸曳き痕の痕数及び痕幅を計測する第2の工程と、剥離力並びに糸曳き痕の痕数及び痕幅に基づいて、光硬化性粘着剤の良否を判定する第3の工程とを備える。
本実施形態に係る光硬化性粘着剤の評価方法では、紫外線の照射によって硬化する光硬化性粘着剤が評価対象となり得る。以下、評価対象となる光硬化性粘着剤の一例として、反応性官能基を有する(メタ)アクリル共重合体と、光重合開始剤と、反応性官能基と反応可能な官能基を2以上有する架橋剤とを含有する光硬化性粘着剤を説明する。
反応性官能基を有する(メタ)アクリル共重合体は、例えば、1種又は2種以上の(メタ)アクリレート単量体(a1)又は(メタ)アクリル酸と、反応性官能基を有する1種又は2種以上の重合性化合物(a2)とを共重合することによって得ることができる。
光重合開始剤としては、紫外線の照射によって重合を開始させるものであれば特に制限されず、例えば、光ラジカル重合開始剤等が挙げられる。光ラジカル重合開始剤としては、例えば、2,2-ジメトキシ-1,2-ジフェニルエタン-1-オン等のベンゾインケタール;1-ヒドロキシシクロヘキシルフェニルケトン等のα-ヒドロキシケトン;2-ベンジル-2-ジメチルアミノ-1-(4-モルフォリノフェニル)-ブタン-1-オン等のα-アミノケトン;1-[4-(フェニルチオ)フェニル]-1,2-オクタジオン-2-(ベンゾイル)オキシム等のオキシムエステル;ビス(2,4,6-トリメチルベンゾイル)フェニルホスフィンオキシド等のホスフィンオキシド;2-(o-クロロフェニル)-4,5-ジフェニルイミダゾール二量体等の2,4,5-トリアリールイミダゾール二量体;ベンゾフェノン、N,N,N’,N’-テトラメチル-4,4’-ジアミノベンゾフェノン等のベンゾフェノン化合物;2-エチルアントラキノン等のキノン化合物;ベンゾインメチルエーテル等のベンゾインエーテル;ベンゾイン等のベンゾイン化合物;ベンジルジメチルケタール等のベンジル化合物;9-フェニルアクリジン等のアクリジン化合物:N-フェニルグリシン、クマリンなどが挙げられる。これらは1種を単独で用いてもよく、適切な増感剤と組み合わせて用いてもよい。
架橋剤は、反応性官能基を有する(メタ)アクリル共重合体の反応性官能基(エポキシ基、ヒドロキシ基等)と反応可能な官能基を2以上有する化合物であれば特に制限されない。架橋剤と反応性官能基を有する(メタ)アクリル共重合体との反応によって形成される結合としては、例えば、エステル結合、エーテル結合、アミド結合、イミド結合、ウレタン結合、ウレア結合等が挙げられる。
図1は、ダイシング・ダイボンディング一体型フィルムの一実施形態を示す模式断面図である。ダイシング・ダイボンディング一体型フィルム1は、基材層10、光硬化性粘着剤からなる光硬化性粘着剤層20、及び接着剤層30がこの順に積層されている。
基材層10は、既知のポリマーシート又はフィルムを用いることができ、ダイボンディング工程においてエキスパンドすることが可能な材料で構成されているのであれば、特に制限されない。このような材料としては、例えば、結晶性ポリプロピレン、非晶性ポリプロピレン、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン、超低密度ポリエチレン、低密度直鎖ポリエチレン、ポリブテン、ポリメチルペンテン等のポリオレフィン;エチレン-酢酸ビニル共重合体;アイオノマー樹脂;エチレン-(メタ)アクリル酸共重合体;エチレン-(メタ)アクリル酸エステル(ランダム、交互)共重合体;エチレン-プロピレン共重合体;エチレン-ブテン共重合体;エチレン-ヘキセン共重合体;ポリウレタン;ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル;ポリカーボネート;ポリイミド;ポリエーテルエーテルケトン;ポリイミド;ポリエーテルイミド;ポリアミド;全芳香族ポリアミド;ポリフェニルスルフイド;アラミド(紙);ガラス;ガラスクロス;フッ素樹脂;ポリ塩化ビニル;ポリ塩化ビニリデン;セルロース系樹脂;シリコーン樹脂などが挙げられる。これらの材料は、可塑剤、シリカ、アンチブロッキング材、スリップ剤、帯電防止剤等と混合した材料であってもよい。
光硬化性粘着剤層20は、上述の光硬化性粘着剤からなる層である。光硬化性粘着剤層20は、基材層10上に形成されている。基材層10上に光硬化性粘着剤層20を形成する方法としては、例えば、光硬化性粘着剤層形成用ワニスを調製し、当該ワニスを基材層10に塗工して、当該ワニスの揮発成分を除去し、光硬化性粘着剤層20を形成する方法、当該ワニスを離型処理されたフィルム上に塗工し、当該ワニスの揮発成分を除去して、光硬化性粘着剤層20を形成し、得られた光硬化性粘着剤層20を基材層10に転写する方法が挙げられる。
接着剤層30は、接着剤からなる層である。接着剤は、ダイボンディングフィルムの分野で使用される接着剤であれば特に制限されない。以下、接着剤の一例として、エポキシ樹脂と、エポキシ樹脂硬化剤と、エポキシ基を有する(メタ)アクリル共重合体とを含有する接着剤を説明する。このような接着剤からなる接着剤層30によれば、チップと基板との間、チップとチップとの間の接着性に優れ、電極埋め込み性、ワイヤー埋め込み性等を付与することが可能であり、かつダイボンディング工程において、低温で接着することが可能となる。
糸曳きは、接着剤層と光硬化性粘着剤層の硬化物との界面での相互作用で発生し得る。そのため、糸曳き現象の影響因子の1つとしては、架橋剤の種類及び含有量が挙げられる。例えば、架橋剤の含有量を減少させると、糸曳き痕の痕数は増加し、糸曳き痕の痕幅も大きくなる傾向にある。したがって、架橋剤の種類及び含有量を調整することによって、糸曳き痕数及び痕幅を制御し得る。また、光硬化性粘着剤の組成以外の糸曳き現象の影響因子としては、塗工条件が挙げられる。塗工速度、塗工温度、風量等の塗工条件を変更させることによって、糸曳き痕数及び痕幅を制御し得る。さらに、糸曳き現象の影響因子としては、ダイシング・ダイボンディング一体型フィルムの作製時の接着剤層と光硬化性粘着剤層とを貼り合わせるときの条件、接着剤層及び光硬化性粘着剤層の表面物性(表面粗さ、表面自由エネルギー等)、反応性官能基を有する(メタ)アクリル共重合体の分子量、極性及びガラス転移点等が挙げられる。
本工程では、まず、基材層、評価対象である光硬化性粘着剤からなる光硬化性粘着剤層、及び接着剤層がこの順に積層された評価用ダイシング・ダイボンディング一体型フィルムを準備する。
照射強度:70mW/cm2
積算光量:150mJ/cm2
温度:25±5℃
湿度:55±10%
剥離角度:30°
剥離速度:600mm/分
本工程では、まず、基材層、評価対象である光硬化性粘着剤からなる光硬化性粘着剤層、及び接着剤層がこの順に積層された評価用ダイシング・ダイボンディング一体型フィルムを準備する。第2の工程の評価用ダイシング・ダイボンディング一体型フィルムは、第1の工程の評価用ダイシング・ダイボンディング一体型フィルムと同じものであってよいが、第1の工程の剥離力の測定を行っていないものを用いる。
加熱処理:65℃、15分間
冷却処理:25±5℃まで空冷
本工程では、剥離力並びに糸曳き痕の痕数及び痕幅に基づいて、光硬化性粘着剤の良否を判定する。評価基準である剥離力並びに糸曳き痕の痕数及び痕幅の基準は、半導体ウエハの厚み等に合わせて適宜設定することができる。
条件(b):接着剤層が剥離された後の光硬化性粘着剤層の硬化物の表面に糸曳き痕の痕数が15以上である25μm×25μmの領域(場合により「特定領域」という場合がある。)が存在し、領域内における糸曳き痕の痕幅の中央値が120~200nmである。
一実施形態に係るダイシング・ダイボンディング一体型フィルムの製造方法は、基材層上に、上述の光硬化性粘着剤の評価方法で良と判定された光硬化性粘着剤からなる光硬化性粘着剤層を形成する工程と、光硬化性粘着剤層上に接着剤層を形成する工程とを備える。基材層及び接着剤層は、上述の光硬化性粘着剤の評価方法で例示したものと同様のものであってよい。光硬化性粘着剤層の形成方法及び接着剤層の形成方法も、上述の光硬化性粘着剤の評価方法で例示した方法と同様であってよい。
一実施形態に係るダイシング・ダイボンディング一体型フィルムは、基材層と、上述の光硬化性粘着剤の評価方法で良と判定された光硬化性粘着剤からなる光硬化性粘着剤層と、接着剤層とをこの順に備える。基材層及び接着剤層は、上述の光硬化性粘着剤の評価方法で例示したものと同様のものであってよい。
図5及び図6は、半導体装置の製造方法の一実施形態を説明するための模式断面図である。本実施形態に係る半導体装置の製造方法は、上述の製造方法によって得られるダイシング・ダイボンディング一体型フィルム1の接着剤層30を半導体ウエハW2に貼り付ける工程(ウエハラミネート工程)と、半導体ウエハW2、接着剤層30、及び光硬化性粘着剤層20を個片化する工程(ダイシング工程)と、光硬化性粘着剤層20に対して紫外線を照射する工程(紫外線照射工程)と、基材層10から接着剤層30aが付着した半導体素子(接着剤層付き半導体素子50)をピックアップする工程(ピックアップ工程)と、接着剤層30aを介して、接着剤層付き半導体素子50を半導体素子搭載用支持基板60に接着する工程(半導体素子接着工程)とを備える。
ダイシングがステルスダイシングを適用したものである場合、半導体装置の製造方法は、ウエハラミネート工程の前に改質層形成工程を備えていてよい。
次いで、ダイシング・ダイボンディング一体型フィルム1の接着剤層30を所定の装置に配置する。続いて、半導体ウエハW2の主面Wsに、接着剤層30を介してダイシング・ダイボンディング一体型フィルム1を貼り付け(図5(d)参照)、半導体ウエハW2の保護フィルム2を剥離する(図5(e)参照)。
次に、少なくとも半導体ウエハW2及び接着剤層30をダイシングによって個片化する(図6(f)参照)。ダイシングがステルスダイシングを適用したものである場合、ク-ルエキスパンド及びヒートシュリンクを行うことによって個片化することができる。
次に、光硬化性粘着剤層20に紫外線を照射することによって光硬化性粘着剤層20を硬化させ、光硬化性粘着剤層の硬化物を形成する(図6(g)参照)。これによって、光硬化性粘着剤層20と接着剤層30との間の粘着力を低下させることができる。紫外線照射においては、波長200~400nmの紫外線を用いることが好ましい。紫外線照射条件は、照度:30~240mW/cm2で照射量200~500mJ/cm2となるように調整することが好ましい。
次に、基材層10をエキスパンドすることによって、ダイシングされた接着剤層付き半導体素子50を互いに離間させつつ、基材層10側からニードル42で突き上げられた接着剤層付き半導体素子50を吸引コレット44で吸引して、光硬化性粘着剤層の硬化物20acからピックアップする(図6(h)参照)。なお、接着剤層付き半導体素子50は、半導体素子Waと接着剤層30aとを有する。半導体素子Waは半導体ウエハW2がダイシングによって分割されたものであり、接着剤層30aは接着剤層30がダイシングによって分割されたものである。光硬化性粘着剤層の硬化物20acは光硬化性粘着剤層の硬化物がダイシングによって分割されたものである。光硬化性粘着剤層の硬化物20acは接着剤層付き半導体素子50をピックアップする際に基材層10上に残存し得る。ピックアップ工程では、必ずしもエキスパンドする必要はないが、エキスパンドすることによってピックアップ性をより向上させることができる。
接着剤層付き半導体素子50をピックアップした後、接着剤層付き半導体素子50を、熱圧着によって、接着剤層30aを介して半導体素子搭載用支持基板60に接着する(図6(i)参照)。半導体素子搭載用支持基板60には、複数の接着剤層付き半導体素子50を接着してもよい。
((メタ)アクリル共重合体溶液A~Eの調製)
スリーワンモータ、撹拌翼、及び窒素導入管が備え付けられた容量2000mLのオートクレーブに、2-エチルヘキシルアクリレート(2EHA)、2-ヒドロキシエチルアクリレート(HEA)、及びメタクリル酸(MAA)を表1に示す割合(単位:質量部)で加え、さらに酢酸エチル127質量部及びアゾビスイソブチロニトリル0.04質量部を加えた。これを均一になるまで撹拌し、流量500ml/minで60分間バブリングを実施し、系中の溶存酸素を脱気した。次いで、1時間かけて78℃まで昇温し、78~83℃で維持したまま6時間重合させた。その後、スリーワンモータ、撹拌翼、及び窒素導入管が備え付けられた容量2000mLの加圧釜に反応溶液を移し、120℃、0.28MPa条件で4.5時間加温した後、室温(25℃、以下同様)まで冷却した。次に、酢酸エチルを98質量部さらに加えて希釈した。これに重合禁止剤としてヒドロキノン・モノメチルエーテルを0.05質量部及びウレタン化触媒としてジオクチルスズジラウレート0.02質量部を添加し、連鎖重合可能な官能基を有する化合物として2-メタクリロキシエチルイソシアネート(昭和電工株式会社製、商品名「カレンズMOI」)10質量部を加えて、70℃で6時間反応させ、室温まで冷却した。その後、不揮発分(固形分)含有量が35質量%となるように酢酸エチルを加えて、反応性官能基としてヒドロキシ基を有する(メタ)アクリル共重合体溶液A~Eを得た。
(ダイシングフィルムの作製)
反応性官能基を有する(メタ)アクリル共重合体として上記で調製した(メタ)アクリル共重合体溶液Aを固形分として100質量部、光重合開始剤として1-ヒドロキシシクロヘキシルフェニルケトン(チバスペシャリティケミカルズ株式会社製、イルガキュア184)0.5質量部、及び架橋剤として多官能イソシアネート(日本ポリウレタン工業株式会社製、商品名「コロネートL」、固形分75%)2質量部を混合した。この混合物に対して、固形分の総含有量が25質量%となるように酢酸エチルを加え、10分間均一に撹拌して、光硬化性粘着剤層形成用ワニスを得た。得られた光硬化性粘着剤層形成用ワニスを、片面が離型処理された幅350mm、長さ400mm、厚み38μmのポリエチレンテレフタレート(PET)フィルム上に乾燥後の光硬化性粘着剤層の厚みが10μmとなるように、ギャップを調整しながら塗工し、80~100℃で光硬化性粘着剤層形成用ワニスを3分間加熱乾燥した。その後、片面にコロナ放電処理が施されたポリオレフィン製フィルム(基材層、厚み:90μm)を貼り合わせ、40℃、72時間の条件で養生を行い、架橋処理を行うことによって、基材層と光硬化性粘着剤層とを備えるダイシングフィルムを得た。なお、架橋処理は、FT-IRスペクトルを用いて、養生の進行を確認しながら行った。
エポキシ樹脂としてYDCN-703(東都化成株式会社製、商品名、クレゾールノボラック型エポキシ樹脂、エポキシ当量210、分子量1200、軟化点80℃)55質量部、フェノール樹脂としてミレックスXLC-LL(三井化学株式会社製、商品名、水酸基当量175、吸水率1.8%、350℃における加熱質量減少率4%)45質量部、シランカップリング剤としてNUCA-189(日本ユニカー株式会社製、商品名、γ-メルカプトプロピルトリメトキシシラン)1.7質量部及びNUCA-1160(日本ユニカー株式会社製、商品名、γ-ウレイドプロピルトリエトキシシラン)3.2質量部、並びにフィラーとしてアエロジルR972(シリカ表面をジメチルジクロロシランで被覆し、400℃の反応器中で加水分解して、メチル基等の有機基によって表面修飾されたシリカフィラー、日本アエロジル株式会社製、商品名、平均粒径0.016μm)32質量部に、シクロヘキサノンを加えて撹拌混合し、さらにビーズミルを用いて90分混錬した。得られた混合物に対して、アクリルゴムとしてHTR-860P-3(ナガセケムテックス株式会社製、商品名、重量平均分子量80万、グリシジルアクリレート又はグリシジルメタクリレート3質量%を含むアクリルゴム)280質量部及び硬化促進剤としてキュアゾール2PZ-CN(四国化成工業株式会社製、商品名、1-シアノエチル-2-フェニルイミダゾール)0.5質量部加えて撹拌混合し、真空脱気することによって、接着剤層形成用ワニスを得た。得られた接着剤層形成用ワニスを設定の厚みとなるように離型処理されたポリエチレンテレフタレート(PET)フィルム上に塗布し、140℃で5分間加熱乾燥して、厚みが10μmのBステージ状態の接着剤層を形成し、接着剤層を備えるダイボンディングフィルムを作製した。
上記で作製したダイボンディングフィルムをPETフィルムごと取り扱いし易いサイズにカットした。カットしたダイボンディングフィルムの接着剤層に、貼り付ける直前にPETフィルムを剥がしてダイシングフィルムの光硬化性粘着剤層を貼り合わせた。貼り合わせは、クリーンルーム(温度23℃、湿度50%の無塵室内)でラミネートマシンを用い、ロールを加温しない(すなわち、温度23℃)で行った。その後、接着剤層と光硬化性粘着剤層との密着性を一定に保つ観点から、4℃の冷蔵庫で1日保管することによってダイシング・ダイボンディング一体型フィルムAを得た。
架橋剤の含有量を8質量部から10質量部に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムBを得た。
(メタ)アクリル共重合体溶液をAからBに変更し、架橋剤の含有量を8質量部から6質量部に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムCを得た。
光硬化性粘着剤層形成用ワニスの塗工速度を製造例1の塗工速度に対して0.8倍に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムDを得た。
光硬化性粘着剤層形成用ワニスの塗工速度を製造例1の塗工速度に対して1.2倍に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムEを得た。
(メタ)アクリル共重合体溶液をAからCに変更し、架橋剤の含有量を8質量部から6質量部に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムFを得た。
(メタ)アクリル共重合体溶液をAからDに変更し、架橋剤の含有量を8質量部から6質量部に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムGを得た。
架橋剤の含有量を8質量部から6質量部に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムHを得た。
(メタ)アクリル共重合体溶液Aから(メタ)アクリル共重合体溶液Eに変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムIを得た。
光硬化性粘着剤層形成用ワニスの塗工速度を製造例1の塗工速度に対して1.5倍に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムJを得た。
光硬化性粘着剤層形成用ワニスの塗工速度を製造例1の塗工速度に対して0.6倍に変更した以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムKを得た。
ダイシング・ダイボンディング一体型フィルムの作製において、クリーンルーム(温度23℃、湿度50%の無塵室内)で、ダイシングフィルムのPETフィルムを剥がし、光硬化性粘着剤層を空気暴露させて1日以上放置したものをダイボンディングフィルムの接着剤層に貼り付けた以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムLを得た。
ダイシング・ダイボンディング一体型フィルムの作製において、ラミネートマシンのロールを50℃に加温しながら、ダイボンディングフィルムの接着剤層とダイシングフィルムの光硬化性粘着剤層とを貼り付けた以外は、製造例1と同様にして、ダイシング・ダイボンディング一体型フィルムMを得た。
<測定サンプルの作製>
ダイシング・ダイボンディング一体型フィルムA~Mをそれぞれ幅30mm、長さ200mmに切り分け、ダイボンディングフィルムの接着剤層側のPETフィルムを剥がし、支持フィルム(王子タック株式会社製、ECテープ)を接着剤層側にローラーを用いて貼り付け、幅25mm、長さ170mmに切り出した。次に、切り出した粘着フィルム付きダイシング・ダイボンディング一体型フィルムの基材層(ポリオレフィン製フィルム)側から、紫外線照射装置(株式会社GSユアサ製、UV SYSTEM、中心波長365nmの紫外線)を用いて、照射温度40℃以下、照射強度70mW/cm2、及び積算光量150mJ/cm2で照射し、光硬化性粘着剤層の硬化物を形成することによって測定サンプルを得た。
上記で作製した測定サンプルを角度自在タイプの粘着・被膜剥離解析装置VPA-2S(協和界面科学株式会社製)を用い、温度25±5℃、湿度55±10%、剥離角度30°、及び剥離速度600mm/分で支持フィルムを引っ張り、接着剤層と光硬化性粘着剤層の硬化物とを剥離させたときの剥離力(低角(30°)ピール強度)を測定した。同様の測定を3回行い、その平均値を低角ピール強度とした。結果を表2、表3、及び表4に示す。また、条件(a)(剥離力が0.70N/25mm以下である)の充足性についても表2、表3、及び表4に示す。
<測定サンプルの作製>
ダイシング・ダイボンディング一体型フィルムは、上記剥離力の測定で用いたものと同じものであって、上記剥離力の測定を行っていないものを用いた。ダイシング・ダイボンディング一体型フィルムA~Mをそれぞれ幅30mm、長さ50mm以上に切り分けた。次に、ダイシング・ダイボンディング一体型フィルムの基材層(ポリオレフィン製フィルム)にヒーターを接して、光硬化性粘着剤層を65℃、15分間加熱し、その後、25±5℃まで空冷した。空冷後、ダイボンディングフィルムの接着剤層側のPETフィルムを剥がし、支持フィルム(王子タック株式会社製、ECテープ)を貼り合わせて、幅が25mmになるように切りそろえた。次いで、加熱冷却後の支持フィルム付きダイシング・ダイボンディング一体型フィルムの基材層(ポリオレフィン製フィルム)側から、紫外線照射装置(株式会社GSユアサ製、UV SYSTEM、中心波長365nmの紫外線)を用いて、照射温度40℃以下、照射強度70mW/cm2、及び積算光量150mJ/cm2で照射し、光硬化性粘着剤層の硬化物を形成した。次いで、角度自在タイプの粘着・被膜剥離解析装置VPA-2S(協和界面科学株式会社製)を用い、温度25±5℃、湿度55±10%、剥離角度30°、及び剥離速度600mm/分で支持フィルムを引っ張り、接着剤層と光硬化性粘着剤層の硬化物とを剥離させ、接着剤層が剥離された後の光硬化性粘着剤層の硬化物を備える基材層を回収し、5mm×5mmのサイズに切り分けることによって、計測サンプルを得た。
上記で作製した計測サンプルを板状のステージに固定した。計測サンプルの固定には、カーボン両面テープを用いた。走査型プローブ顕微鏡(エスアイアイ・ナノテクノロジー株式会社製、商品名「SPA400」)を用いて、接着剤層が剥離された後の光硬化性粘着剤層の硬化物の表面を観察し、画像解析ソフト(「SPA400」に付属)を用いて解析した。走査型プローブ顕微鏡の探針には、バネ定数の低いカンチレバー(オリンパス株式会社製、商品名「OMCL-AC240TS」)を設置して行った。光硬化性粘着剤層の硬化物の観察においては、ダイナミックフォースモード(DFM)で観察し、同時に位相像のデータを取得し、その位相像において明らかに硬さが周囲と異なっている箇所を糸曳き痕とした。計測サンプルの観察においては、観察の対象である表面に糸曳き痕の痕数が15以上である25μm×25μmの領域(特定領域)が存在するか否かを確認した。接着剤層が剥離された後の光硬化性粘着剤層の硬化物の表面に糸曳き痕の痕数が15以上である特定領域が存在した場合、特定領域に存在する糸曳き痕の痕幅の中央値を算出した。糸曳き痕の痕幅は、以下のようにして求めた。まず、走査型プローブ顕微鏡を用いて、位相像において硬さが明らかに周囲と異なっている箇所を含む光硬化性粘着剤層の硬化物の表面の形状像プロファイル及び位相像プロファイルを取得した。次いで、取得した形状像プロファイルから、市販の画像処理ソフト(走査型プローブ顕微鏡付属の画像処理ソフト等)を用いて、測定対象となる糸曳き痕全てに対して、各糸曳き痕の痕幅が最大となるような断面線の断面プロファイルをそれぞれ出力し、上述の基準に基づき、糸曳き痕の痕幅を求めた。なお、形状像プロファイルにおいて、糸曳き痕は、最も淡い色(白黒画像の場合、例えば、白色)で示されるが、位相像において硬さが明らかに周囲と異なっている箇所の個数は、形状像プロファイルにおいて最も淡い色で示される箇所の個数と同数であった。結果を表2、表3、及び表4に示す。また、条件(b)(接着剤層が剥離された後の光硬化性粘着剤層の硬化物の表面に糸曳き痕の痕数が15以上である25μm×25μmの領域が存在し、領域内における糸曳き痕の痕幅の中央値が120~200nmである)の充足性についても表2、表3、及び表4に示す。
得られた製造例1~13のダイシング・ダイボンディング一体型フィルムA~Mについて、ダイシング工程の所定の条件におけるピックアップの成功率及びピックアップにかかる剥離時間を評価した。
(改質層形成)
半導体ウエハ(シリコンウエハ(厚み750μm、外径12インチ))の片面に、バックグラインドテープを貼り付け、バックグラインドテープ付き半導体ウエハを得た。半導体ウエハのバックグラインドテープが貼り付けられた側とは反対側の面に対してレーザ光を照射して半導体ウエハ内部に改質層を形成した。レーザの照射条件は以下のとおりである。
波長:1342nm
発振形式:パルス
周波数:90kHz
出力:1.7W
半導体ウエハの載置台の移動速度:700mm/秒
半導体ウエハのバックグラインドテープが貼り付けられた側とは反対側の面に、ダイシング・ダイボンディング一体型フィルムのPETフィルムを剥がし、接着剤層を貼り付けた。
次いで、改質層を有するダイシング・ダイボンディング一体型フィルム付き半導体ウエハをエキスパンド装置に固定した。次いで、ダイシングフィルムを下記条件でエキスパンドし、半導体ウエハ、接着剤層、及び光硬化性粘着剤層を個片化した。
クールエキスパンド条件:
温度:-15℃、高さ:9mm、冷却時間:90秒、速度:300mm/秒、待機時間:0秒
ヒートシュリンク条件:
温度:220℃、高さ:7mm、保持時間:15秒、速度:30mm/秒、ヒーター速度:7℃/秒
個片化された半導体ウエハの光硬化性粘着剤層を照射強度70mW/cm2及び積算光量150mJ/cm2で中心波長365nmの紫外線を照射し、光硬化性粘着剤層の硬化物を形成することによって後述のピックアップ性の評価サンプルを得た。
ダイボンダDB-830P(ファスフォードテクノロジ株式会社製(旧株式会社日立ハイテクノロジーズ製)を用いて、ピン本数9本でピックアップ試験を行った。ピックアップ用コレットには、RUBBER TIP 13-087E-33(マイクロメカニクス社製、商品名、サイズ:10×10mm)を用いた。突上げピンには、EJECTOR NEEDLE SEN2-83-05(マイクロメカニクス社製、商品名、直径:0.7mm、先端形状:直径350μmの半円)を用いた。突上げピンは、ピン中心から等間隔に9本を配置した。
上記ピックアップ試験において、ピックアップの成功率が95~100%であったものを「A」、95%未満であったものを「B」と評価した。結果を表2、表3、及び表4に示す。
高速度カメラMEMRECM GX-1Plus(株式会社ナックイメージテクノロジー製、商品名)を用いて、上記ピックアップ試験を撮影し、コレットがチップに接触してから、接着剤層と光硬化性粘着剤層とが完全に剥離されるまでの時間を剥離時間として評価した。ピックアップは1mm/秒で300μmまで突き上げることによって行った。フレームレートは1000フレーム/秒とした。剥離時間が60m秒以下であったものを「A」、60m秒を超え90m秒未満であったものを「B」、90m秒を超えたものを「C」と評価した。結果を表2、表3、及び表4に示す。
Claims (10)
- ダイシング・ダイボンディング一体型フィルムに用いられる光硬化性粘着剤の評価方法であって、
基材層、光硬化性粘着剤からなる光硬化性粘着剤層、及び接着剤層がこの順に積層されたダイシング・ダイボンディング一体型フィルムを準備し、前記光硬化性粘着剤層に対して下記照射条件で紫外線を照射して、前記光硬化性粘着剤層の硬化物を形成し、下記剥離条件で前記接着剤層と前記光硬化性粘着剤層の硬化物とを剥離させたときの剥離力を測定する第1の工程と、
基材層、光硬化性粘着剤からなる光硬化性粘着剤層、及び接着剤層がこの順に積層されたダイシング・ダイボンディング一体型フィルムを準備し、前記光硬化性粘着剤層を下記加熱冷却条件で処理し、前記光硬化性粘着剤層に対して下記照射条件で紫外線を照射して、前記光硬化性粘着剤層の硬化物を形成し、下記剥離条件で前記接着剤層と前記光硬化性粘着剤層の硬化物とを剥離させ、前記接着剤層が剥離された後の前記光硬化性粘着剤層の硬化物の表面を走査型プローブ顕微鏡で観察し、前記表面における糸曳き痕の痕数及び痕幅を計測する第2の工程と、
前記剥離力並びに前記糸曳き痕の痕数及び痕幅に基づいて、前記光硬化性粘着剤の良否を判定する第3の工程と、
を備える、光硬化性粘着剤の評価方法。
(照射条件)
照射強度:70mW/cm2
積算光量:150mJ/cm2
(剥離条件)
温度:25±5℃
湿度:55±10%
剥離角度:30°
剥離速度:600mm/分
(加熱冷却条件)
加熱処理:65℃、15分間
冷却処理:25±5℃まで30分間空冷静置 - 前記第3の工程は、前記剥離力並びに前記糸曳き痕の痕数及び痕幅が下記条件(a)及び下記条件(b)を満たすか否かによって前記光硬化性粘着剤の良否を判定する工程である、請求項1に記載の光硬化性粘着剤の評価方法。
条件(a):前記剥離力が0.70N/25mm以下である。
条件(b):前記接着剤層が剥離された後の前記光硬化性粘着剤層の硬化物の表面に、糸曳き痕の痕数が15以上である25μm×25μmの領域が存在し、前記領域内における前記糸曳き痕の痕幅の中央値が120~200nmである。 - 前記光硬化性粘着剤が、反応性官能基を有する(メタ)アクリル共重合体と、光重合開始剤と、前記反応性官能基と反応可能な官能基を2以上有する架橋剤とを含有する、請求項1又は2に記載の光硬化性粘着剤の評価方法。
- 前記(メタ)アクリル共重合体が、(メタ)アクリル酸を単量体単位として含む、請求項3に記載の光硬化性粘着剤の評価方法。
- 前記接着剤層が、エポキシ樹脂と、エポキシ樹脂硬化剤と、エポキシ基を有する(メタ)アクリル共重合体とを含有する、請求項1~4のいずれか一項に記載の光硬化性粘着剤の評価方法。
- 基材層上に、請求項1~5のいずれか一項に記載の光硬化性粘着剤の評価方法で良と判定された光硬化性粘着剤からなる光硬化性粘着剤層を形成する工程と、
前記光硬化性粘着剤層上に接着剤層を形成する工程と、
を備える、ダイシング・ダイボンディング一体型フィルムの製造方法。 - 請求項6に記載の製造方法によって得られるダイシング・ダイボンディング一体型フィルムの前記接着剤層を半導体ウエハに貼り付ける工程と、
前記半導体ウエハ、前記接着剤層、及び前記光硬化性粘着剤層をダイシングによって個片化する工程と、
前記光硬化性粘着剤層に対して紫外線を照射し、前記光硬化性粘着剤層の硬化物を形成する工程と、
前記光硬化性粘着剤層の硬化物から前記接着剤層が付着した半導体素子をピックアップする工程と、
前記接着剤層を介して、前記半導体素子を半導体素子搭載用の支持基板に接着する工程と、
を備える、半導体装置の製造方法。 - 前記半導体ウエハの厚みが、35μm以下である、請求項7に記載の製造方法。
- 前記ダイシングが、ステルスダイシングを適用したものである、請求項7又は8に記載の製造方法。
- 基材層と、請求項1~5のいずれか一項に記載の光硬化性粘着剤の評価方法で良と判定された光硬化性粘着剤からなる光硬化性粘着剤層と、接着剤層とをこの順に備える、ダイシング・ダイボンディング一体型フィルム。
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| JP2020562295A JP7099547B2 (ja) | 2018-12-28 | 2018-12-28 | 光硬化性粘着剤の評価方法、ダイシング・ダイボンディング一体型フィルム及びその製造方法、並びに半導体装置の製造方法 |
| MYPI2021003243A MY207898A (en) | 2018-12-28 | 2018-12-28 | Method for evaluating photocurable adhesive, dicing/die attach film, method for manufacturing same, and method for manufacturing semiconductor device |
| SG11202106221PA SG11202106221PA (en) | 2018-12-28 | 2018-12-28 | Method for evaluating photocurable adhesive, dicing/die attach film, method for manufacturing same, and method for manufacturing semiconductor device |
| KR1020217021116A KR102699401B1 (ko) | 2018-12-28 | 2018-12-28 | 광경화성 점착제의 평가 방법, 다이싱·다이본딩 일체형 필름과 그 제조 방법, 및 반도체 장치의 제조 방법 |
| PCT/JP2018/048581 WO2020136901A1 (ja) | 2018-12-28 | 2018-12-28 | 光硬化性粘着剤の評価方法、ダイシング・ダイボンディング一体型フィルム及びその製造方法、並びに半導体装置の製造方法 |
| TW108147291A TWI816004B (zh) | 2018-12-28 | 2019-12-24 | 光硬化性黏著劑的評價方法、切割-黏晶一體型膜及其製造方法、以及半導體裝置的製造方法 |
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| TWI816004B (zh) | 2023-09-21 |
| CN113228237A (zh) | 2021-08-06 |
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