JP2011253949A - Film for semiconductor and semiconductor device manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film for semiconductor which enables the manufacture of a highly reliable semiconductor device, while improving the easiness of picking up a workpiece and preventing the occurrence of a trouble with a semiconductor element, and to provide a semiconductor device manufacturing method using the film for semiconductor.SOLUTION: A film 10 for semiconductor has: a support film 4; a second adhesive layer 2; a first adhesive layer 1 and an adhesion layer 3, which are stacked in this order. The adhesion layer 3 includes, as a constituent, (meta) acrylic acid ester copolymer having a glass transition point of 0°C or below. The adhesion forces between the adhesion layer 3 and the first adhesive layer 1 at 23°C and 60°C are 30 N/m or below. A semiconductor wafer 7 is stacked on the adhesion layer 3 of the film 10 for semiconductor. When dicing the semiconductor wafer 7 into workpieces, the film for semiconductor supports the semiconductor wafer 7, and the adhesion layer 3 is exfoliated from the first adhesive layer 1 at picking up the resultant workpieces.

Description

  The present invention relates to a semiconductor film and a method for manufacturing a semiconductor device.

  In response to the recent increase in functionality of electronic devices and expansion to mobile applications, there is an increasing demand for higher density and higher integration of semiconductor devices, and IC packages are increasing in capacity and density.

  In these semiconductor device manufacturing methods, first, an adhesive sheet is attached to a semiconductor wafer made of silicon, gallium, arsenic, etc., and the semiconductor wafer is separated into individual semiconductors by a dicing process while fixing the periphery of the semiconductor wafer with a wafer ring. The device is cut and separated (divided into individual pieces). Next, an expanding process for separating the individual semiconductor elements separated from each other and a pickup process for picking up the separated semiconductor elements are performed. Thereafter, the picked-up semiconductor element is transferred to a die bonding process for mounting on a metal lead frame or a substrate (for example, a tape substrate, an organic hard substrate, etc.). Thereby, a semiconductor device is obtained.

  In the die bonding process, the picked-up semiconductor element is stacked on another semiconductor element, whereby a chip stack type semiconductor device in which a plurality of semiconductor elements are mounted in one package can be obtained.

  As an adhesive sheet used in such a method for manufacturing a semiconductor device, one obtained by laminating a first adhesive layer and a second adhesive layer in this order on a base film is known. (For example, refer to Patent Document 1).

  This adhesive sheet is subjected to the dicing process described above in a state of being attached to a semiconductor wafer. In the dicing step, the semiconductor wafer and the two adhesive layers are separated into a plurality of parts by providing a cut so that the tip of the dicing blade reaches the base film. In the pickup process, peeling occurs at the interface between the base film and the two adhesive layers, and the separated semiconductor element is picked up together with the separated two adhesive layers. Is done. The two adhesive layers picked up are responsible for adhesion between the separated semiconductor element and the metal lead frame (or substrate) in the die bonding step.

Incidentally, a device called a die bonder is used in the pickup process.
FIG. 5 is a diagram (longitudinal sectional view) showing a state in which a semiconductor element is picked up using a die bonder and placed on a substrate. In the following description, the upper side in FIG. 5 is referred to as “upper” and the lower side is referred to as “lower”.

  A laminated body 200 shown in FIG. 5 includes an adhesive sheet 210 in which a base film 211, a first adhesive layer 212, and a second adhesive layer 213 are laminated in this order from the lower side, A semiconductor wafer 220 stacked on the adhesive sheet 210 is laminated. When the dicing process is performed on the stacked body 200, the semiconductor wafer 220, the first adhesive layer 212, and the second adhesive layer 213 are separated into individual pieces 230.

  Here, the die bonder 250 shown in FIG. 5 picks up the individual pieces 230 obtained through the dicing process and then transfers them onto the substrate 240.

  The die bonder 250 includes a collet (chip adsorbing unit) 260 that adsorbs the individual pieces 230, a heater 270 that heats the substrate 240 from below, and an apparatus main body 280 that supports the collet 260 so as to be freely movable. The collet 260 can move from the placement portion of the stacked body 200 to the placement portion of the substrate 240 in a state where the individual pieces 230 are adsorbed.

  In the pickup process, the individual piece 230 is picked up by the collet 260, and the individual piece 230 is placed on the substrate 240. Then, the individual piece 230 is bonded to the substrate 240 by pressing the individual piece 230 to the substrate 240 while being heated by the heater 270.

  However, such a conventional pickup process has a problem that the pickup efficiency and the yield are low. As a result, there has been a problem that the productivity of the finally obtained semiconductor device is low.

  When the process of picking up the piece 230 by the die bonder 250 and then pressing the piece 230 to the substrate 240 is repeated, the heat of the heater 270 is transmitted to the collet 260 through the piece 230 and stored. . As a result, the collet 260 is heated, and the pickup process that is supposed to be performed at room temperature is performed at a high temperature due to the influence of the heat. As a result, the heat of the collet 260 is also transmitted to the laminate 200, and the adhesiveness of the first adhesive layer 212 and the second adhesive layer 213 in the laminate 200 is enhanced. It becomes. In such a state, the individual pieces 230 once separated from each other through the dicing process are bonded again, or the base film 211 to be peeled off in the pickup process and the two adhesive layers Adhesive strength is enhanced at the interface, and smooth pickup becomes difficult (pickup property is lowered). Such problems have led to problems such as cracking and chipping of the semiconductor element during pickup.

JP 2004-43761 A

  SUMMARY OF THE INVENTION An object of the present invention is to improve a pickup property and prevent the occurrence of a problem with a semiconductor element, and to manufacture a highly reliable semiconductor device and a semiconductor device using the semiconductor film. It is to provide a method.

Such an object is achieved by the present inventions (1) to (14) below.
(1) An adhesive layer, at least one adhesive layer, and a support film are laminated in this order, and a semiconductor wafer is laminated on the surface of the adhesive layer opposite to the adhesive layer, and in this state, the semiconductor wafer And a film for semiconductor used when cutting the adhesive layer into individual pieces, and picking up the obtained individual pieces from the support film,
As a constituent material of the adhesive layer, it includes a (meth) acrylic acid ester copolymer having a glass transition point of 0 ° C. or lower,
The film for semiconductors characterized by the adhesive force between the said adhesion layer and the said adhesion layer in 23 degreeC and 60 degreeC being 30 N / m or less.

  (2) The film for a semiconductor according to (1), wherein the (meth) acrylic acid ester copolymer has a weight average molecular weight of 100,000 or more.

  (3) The film for a semiconductor according to (1) or (2) above, which contains a phenoxy resin as a constituent material of the adhesive layer.

  (4) The film for semiconductor according to (3), wherein the glass transition point of the phenoxy resin is 90 ° C. or higher.

  (5) The film for semiconductors as described in said (3) or (4) whose weight average molecular weights of the said phenoxy resin are 30,000-80,000.

  (6) The film for a semiconductor according to any one of (1) to (5), wherein the adhesive layer is composed of a plurality of layers.

  (7) The plurality of layers are a first adhesive layer located on the semiconductor wafer side and a second adhesive that is adjacent to the support film side of the first adhesive layer and has a higher adhesiveness than the first adhesive layer. The film for semiconductor as described in said (6) containing the layer.

  (8) The film for a semiconductor according to (7), wherein the outer peripheral edge of the adhesive layer and the outer peripheral edge of the first adhesive layer are respectively positioned on the inner side of the outer peripheral edge of the second adhesive layer.

  (9) The film for a semiconductor according to (7) or (8), wherein the hardness of the second adhesive layer is smaller than the hardness of the first adhesive layer.

  (10) The film for semiconductor according to any one of (7) to (9), wherein the Shore D hardness of the first adhesive layer is 20 to 60.

  (11) Any one of the above (1) to (10), wherein a region of the adhesive layer side surface of the adhesive layer on which the semiconductor wafer is laminated is irradiated with ultraviolet rays prior to lamination with the semiconductor wafer. Film for semiconductor as described in 2.

(12) A laminate is prepared by laminating the semiconductor film and the semiconductor wafer so that the adhesive layer of the semiconductor film according to any one of (1) to (11) is in contact with the semiconductor wafer. A first step of:
A second step of obtaining a plurality of semiconductor elements by dividing the semiconductor wafer into pieces by providing a cut in the stacked body from the semiconductor wafer side;
And a third step of picking up the semiconductor element.

  (13) The method for manufacturing a semiconductor device according to (12), wherein the cut is provided so that a deepest portion thereof is located in the adhesive layer.

(14) In the one notch, the cross-sectional area of the tip side of the interface between the adhesive layer and the adhesive layer is 5 × 10 ^{−5 to} 300 × 10 ⁻⁵ mm ² above (12) or (13) A manufacturing method of a semiconductor device given in (13).

  According to the present invention, even if heat is transmitted to an individual piece at the time of picking up the individual piece, it is possible to prevent the pickup property from being deteriorated. Therefore, according to the present invention, it is possible to obtain a semiconductor film capable of increasing the manufacturing yield of a semiconductor device and manufacturing a highly reliable semiconductor device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view (longitudinal sectional view) for explaining a preferred embodiment of a semiconductor film of the present invention and a method of manufacturing a semiconductor device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view (longitudinal sectional view) for explaining a preferred embodiment of a semiconductor film of the present invention and a method of manufacturing a semiconductor device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view (longitudinal sectional view) for explaining a preferred embodiment of a semiconductor film of the present invention and a method of manufacturing a semiconductor device of the present invention. It is a figure for demonstrating the method to manufacture the film for semiconductors of this invention. It is a figure (longitudinal section) showing signs that a semiconductor element is picked up using a die bonder and placed on a substrate.

  Hereinafter, the film for semiconductor and the method for manufacturing a semiconductor device of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

  1 to 3 are diagrams (longitudinal sectional views) for explaining a preferred embodiment of the semiconductor film of the present invention and the method of manufacturing the semiconductor device of the present invention, and FIG. 4 is a diagram of the semiconductor film of the present invention. It is a figure for demonstrating the method to manufacture. In the following description, the upper side in FIGS. 1 to 4 is referred to as “upper” and the lower side is referred to as “lower”.

[Semiconductor film]
A semiconductor film 10 shown in FIG. 1 has a support film 4, a first adhesive layer 1, a second adhesive layer 2, and an adhesive layer 3. More specifically, the semiconductor film 10 is obtained by laminating the second adhesive layer 2, the first adhesive layer 1, and the adhesive layer 3 on the support film 4 in this order.

  As shown in FIG. 1A, such a semiconductor film 10 supports a semiconductor wafer 7 when the semiconductor wafer 7 is laminated on the upper surface of the adhesive layer 3 and the semiconductor wafer 7 is separated into individual pieces by dicing. At the same time, when the separated semiconductor wafer 7 (semiconductor element 71) is picked up, the first adhesive layer 1 and the adhesive layer 3 are selectively peeled off, so that the picked-up semiconductor element 71 is insulated from the insulating substrate. 5 has a function of providing an adhesive layer 31 for adhering onto the substrate 5. That is, the semiconductor film 10 and the adhesive layer 3 are separated into individual pieces, and the semiconductor film 10 is used to pick up the individual pieces 83 formed by laminating the semiconductor element 71 and the adhesive layer 31.

  Further, the outer peripheral portion 41 of the support film 4 and the outer peripheral portion 21 of the second adhesive layer 2 exist outside the outer peripheral edge 11 of the first adhesive layer 1, respectively.

  Among these, the wafer ring 9 is attached to the outer peripheral portion 21. Thereby, the semiconductor wafer 7 is reliably supported.

Hereinafter, the configuration of each part of the semiconductor film 10 will be described in detail.
(First adhesive layer)
The first adhesive layer 1 is composed of a general adhesive. Specifically, the 1st adhesion layer 1 is comprised by the 1st resin composition containing an acrylic adhesive, a rubber-type adhesive, etc.

  Examples of the acrylic pressure-sensitive adhesive include resins composed of (meth) acrylic acid and esters thereof, (meth) acrylic acid and esters thereof, and unsaturated monomers copolymerizable therewith (for example, vinyl acetate, And a copolymer with styrene, acrylonitrile, etc.). Two or more of these resins may be mixed.

  Of these, one or more selected from the group consisting of methyl (meth) acrylate, ethylhexyl (meth) acrylate and butyl (meth) acrylate, and selected from hydroxyethyl (meth) acrylate and vinyl acetate Preferred are copolymers with one or more of the above. Thereby, control of adhesiveness and adhesiveness with the other party (adherent body) which the 1st adhesion layer 1 adheres becomes easy.

  In addition, the first resin composition includes urethane acrylate, acrylate monomer, polyvalent isocyanate compound (for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate) in order to control adhesiveness (adhesiveness). Monomers and oligomers such as isocyanate compounds may be added.

  Further, in the first resin composition, when the first adhesive layer 1 is cured by ultraviolet rays or the like, methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone as a photopolymerization initiator, Acetophenone compounds such as 2-methyl-1- [4- (methylthio) -phenyl] -2-morpholinopropane-1, benzophenone compounds, benzoin compounds, benzoin isobutyl ether compounds, methyl benzoin benzoate compounds, benzoin Benzoic acid compounds, benzoin methyl ether compounds, benzylfinyl sulfide compounds, benzyl compounds, dibenzyl compounds, diacetyl compounds and the like may be added.

  Also, for the purpose of increasing adhesive strength and shear strength, tackifying rosin resin, terpene resin, coumarone resin, phenol resin, styrene resin, aliphatic petroleum resin, aromatic petroleum resin, aliphatic aromatic petroleum resin, etc. Materials and the like may be added.

  The average thickness of the first adhesive layer 1 is not particularly limited, but is preferably about 1 to 100 μm, more preferably about 3 to 50 μm. If the thickness is less than the lower limit value, it may be difficult to ensure sufficient adhesive strength. If the thickness exceeds the upper limit value, the characteristics are not significantly affected, and no advantage is obtained. When the thickness is within the above range, the first adhesive layer 1 having excellent dicing properties and pick-up properties can be obtained because it does not peel off particularly during dicing and can be peeled off relatively easily with a tensile load during pick-up. can get.

(Second adhesive layer)
The second adhesive layer 2 has higher adhesiveness than the first adhesive layer 1 described above. As a result, the adhesion between the second adhesive layer 2 and the wafer ring 9 is more tightly adhered than between the first adhesive layer 1 and the adhesive layer 3, and in the second step, the semiconductor wafer 7 is diced. Thus, when separating into pieces, the space between the second adhesive layer 2 and the wafer ring 9 is securely fixed. As a result, the positional deviation of the semiconductor wafer 7 is reliably prevented, and the dimensional accuracy of the semiconductor element 71 can be prevented from being lowered.

  As the second adhesive layer 2, the same material as the first adhesive layer 1 described above can be used. Specifically, the second adhesive layer 2 is composed of a second resin composition containing an acrylic adhesive, a rubber adhesive, and the like.

  Examples of the acrylic pressure-sensitive adhesive include resins composed of (meth) acrylic acid and esters thereof, (meth) acrylic acid and esters thereof, and unsaturated monomers copolymerizable therewith (for example, vinyl acetate, Copolymers with styrene, acrylonitrile, etc.) are used. Two or more kinds of these copolymers may be mixed.

  Of these, one or more selected from the group consisting of methyl (meth) acrylate, ethylhexyl (meth) acrylate and butyl (meth) acrylate, and selected from hydroxyethyl (meth) acrylate and vinyl acetate Preferred are copolymers with one or more of the above. Thereby, control of adhesiveness and adhesiveness with the other party (adhered body) which the 2nd adhesion layer 2 adheres becomes easy.

  In addition, the second resin composition includes urethane acrylate, an acrylate monomer, and a polyvalent isocyanate compound (for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate) in order to control adhesiveness (adhesiveness). Monomers and oligomers such as isocyanate compounds may be added.

  Furthermore, you may add the photoinitiator similar to a 1st resin composition to a 2nd resin composition.

  Also, for the purpose of increasing adhesive strength and shear strength, tackifying rosin resin, terpene resin, coumarone resin, phenol resin, styrene resin, aliphatic petroleum resin, aromatic petroleum resin, aliphatic aromatic petroleum resin, etc. Materials and the like may be added.

  The average thickness of the second adhesive layer 2 is not particularly limited, but is preferably about 1 to 100 μm, and more preferably about 3 to 20 μm. If the thickness is less than the lower limit, it may be difficult to ensure sufficient adhesive force, and even if the thickness exceeds the upper limit, a particularly excellent effect cannot be obtained. In addition, since the second adhesive layer 2 is higher in flexibility than the first adhesive layer 1, the shape following property of the second adhesive layer 2 is ensured if the average thickness of the second adhesive layer 2 is within the above range. Thus, the adhesion of the semiconductor film 10 to the semiconductor wafer 7 can be further enhanced.

(Adhesive layer)
The adhesive layer 3 is composed of a third resin composition containing a thermoplastic resin. Such a resin composition is excellent in film forming ability, adhesiveness, and heat resistance after curing.

  In the present invention, as a constituent material (thermoplastic resin) of the adhesive layer 3, the adhesive layer contains a (meth) acrylic acid ester copolymer having a glass transition point of 0 ° C. or lower, and at 23 ° C. and 60 ° C. 3 and the adhesion layer (1st adhesion layer) have the characteristics in the point which is 30 N / m or less.

  By adopting such a configuration, it is possible to prevent the adhesive layer 3 from being tacky (adhesive) due to heat accumulated in the collet during pick-up at the time of die mounting, and picking up continuously. Can do. As a result, it is possible to provide a semiconductor film capable of manufacturing a highly reliable semiconductor device while preventing the occurrence of defects in the semiconductor element.

  Examples of the (meth) acrylic acid ester copolymer include acrylic acid esters such as acrylic acid, methacrylic acid, methyl acrylate, and ethyl acrylate, methacrylic acid esters such as methyl methacrylate and ethyl methacrylate, acrylonitrile, and acrylamide. And a copolymer of these monomer components and copolymers of these monomer components with other monomer components.

  Further, as the (meth) acrylic acid ester copolymer, it is preferable to use a copolymer having a compound having a functional group such as an epoxy group, a hydroxyl group, a carboxyl group, or a nitrile group (copolymerization monomer component). Thereby, the adhesiveness to adherends, such as semiconductor element 71, can be improved more. Specific examples of the compound having a functional group include glycidyl methacrylate having a glycidyl ether group, hydroxy methacrylate having a hydroxyl group, carboxy methacrylate having a carboxyl group, and acrylonitrile having a nitrile group.

  Further, the content of the compound having the functional group is not particularly limited, but is preferably about 0.5 to 40% by mass of the entire (meth) acrylic acid ester copolymer, and particularly about 5 to 30% by mass. It is more preferable that When the content is less than the lower limit, the effect of improving the adhesion may be reduced, and when the content exceeds the upper limit, the adhesive force is too strong and the effect of improving the workability may be reduced.

  In the present invention, the glass transition point of the (meth) acrylic acid ester copolymer is 0 ° C. or less, more preferably −35 to −5 ° C., and further preferably −25 to −10 ° C. preferable. Thereby, the effect of this invention can be made more remarkable. The glass transition point of the (meth) acrylic acid ester copolymer can be controlled by the mixing ratio of the above-mentioned monomers. For example, the glass transition point can be lowered by increasing the content ratio of the monomer that increases the side chain length and decreasing the content ratio of acrylonitrile having a nitrile group. More specifically, the blending amount of ethyl acrylate and butyl acrylate as monomer units is 70 mol% or more in the (meth) acrylic acid ester copolymer, and the blending amount of acrylonitrile is 30 mol% or less, thereby setting the glass transition point. It can be 0 ° C. or lower.

  The weight average molecular weight of such a (meth) acrylic acid ester copolymer is preferably 100,000 or more, and more preferably 150,000 to 1,000,000. Thereby, the pick-up property can be further improved, and the film-forming property of the adhesive layer 3 can be improved.

  Examples of the thermoplastic resin include, in addition to the above (meth) acrylic acid ester copolymer, polyimide resins such as polyimide resins and polyetherimide resins, polyamide resins such as polyamide resins and polyamideimide resins, and phenoxy. Resin or the like may be contained. Among these, it is preferable to contain a phenoxy resin. Thereby, the pick-up property can be further improved.

  Moreover, when a phenoxy resin is included, it is preferable that the glass transition point of a phenoxy resin is 90 degreeC or more, and it is more preferable that it is 100-130 degreeC. Thereby, the pickup property can be further improved. Moreover, it can be excellent in adhesion to the organic substrate.

  Further, a thermosetting resin may be included as a constituent material (third resin composition) of the adhesive layer 3.

  Examples of thermosetting resins include phenol novolac resins, cresol novolac resins, novolac phenol resins such as bisphenol A novolac resins, phenol resins such as resole phenol resins, bisphenol epoxy resins such as bisphenol A epoxy resins and bisphenol F epoxy resins. , Novolac epoxy resins, cresol novolac epoxy resins, novolac epoxy resins, biphenyl epoxy resins, stilbene epoxy resins, triphenolmethane epoxy resins, alkyl-modified triphenolmethane epoxy resins, triazine nucleus-containing epoxy resins, dicyclo Epoxy resins such as pentadiene-modified phenolic epoxy resins, urea (urea) resins, resins having a triazine ring such as melamine resins, unsaturated poly Steal resin, bismaleimide resin, polyurethane resin, diallyl phthalate resin, silicone resin, resin having a benzoxazine ring, cyanate ester resin, etc. may be mentioned, and one or a mixture of two or more of these may be used. Good. Of these, epoxy resins or phenol resins are preferred. According to these resins, the heat resistance and adhesion of the adhesive layer 3 can be further improved.

  Further, the content of the thermosetting resin is not particularly limited, but is preferably about 1 to 400 parts by mass, more preferably about 3 to 300 parts by mass with respect to 100 parts by mass of the thermoplastic resin. . If the content exceeds the upper limit, chipping and cracking may occur, or the effect of improving the adhesion may be reduced.If the content is lower than the lower limit, the adhesive force is too strong and pickup failure is caused. This may occur or the effect of improving workability may be reduced.

Moreover, the third resin composition may further contain a curing agent.
Examples of the curing agent include aliphatic polyamines such as diethylenetriamine (DETA), triethylenetetramine (TETA), and metaxylylenediamine (MXDA), diaminodiphenylmethane (DDM), m-phenylenediamine (MPDA), diaminodiphenylsulfone ( DDS) and other aromatic polyamines, dicyandiamide (DICY), amine-based curing agents such as polyamine compounds containing organic acid dihydralazide, and the like, alicyclic acids such as hexahydrophthalic anhydride (HHPA) and methyltetrahydrophthalic anhydride (MTHPA) Acid anhydride curing agents such as anhydrides (liquid acid anhydrides), trimellitic anhydride (TMA), pyromellitic anhydride (PMDA), and benzophenone tetracarboxylic acid (BTDA), phenolic resins Phenolic Agents, and the like. Among these, a phenolic curing agent is preferable, and specifically, bis (4-hydroxy-3,5-dimethylphenyl) methane (common name: tetramethylbisphenol F), 4,4′-sulfonyldiphenol, 4,4′- Isopropylidenediphenol (commonly called bisphenol A), bis (4-hydroxyphenyl) methane, bis (2-hydroxyphenyl) methane, (2-hydroxyphenyl) (4-hydroxyphenyl) methane, and bis (4- Hydroxyphenyl) methane, bis (2-hydroxyphenyl) methane, (2-hydroxyphenyl) (4-hydroxyphenyl) methane, a mixture of three types (for example, bisphenol FD manufactured by Honshu Chemical Industry Co., Ltd.) Bisphenols, 1,2-benzenediol, 1,3-benzenedio Dihydroxybenzenes such as 1,4-benzenediol, trihydroxybenzenes such as 1,2,4-benzenetriol, various isomers of dihydroxynaphthalene such as 1,6-dihydroxynaphthalene, 2,2′-biphenol , Compounds such as various isomers of biphenols such as 4,4′-biphenol.

  Further, the content of the curing agent (particularly phenol-based curing agent) is not particularly limited, but is preferably 1 to 200 parts by mass, particularly 3 to 150 parts by mass with respect to 100 parts by mass of the thermoplastic resin. Is more preferable. If the content is less than the lower limit, the effect of improving the heat resistance of the adhesive layer 3 may be reduced, and if the content exceeds the upper limit, the storage stability of the adhesive layer 3 may be reduced.

  Further, when the thermosetting resin described above is an epoxy resin, it can be determined by calculating the equivalent ratio of the epoxy equivalent and the curing agent. The epoxy equivalent of the epoxy resin and the equivalent of the functional group of the curing agent (for example, phenol resin) If present, the ratio of hydroxyl equivalent) is preferably 0.5 to 1.5, particularly preferably 0.7 to 1.3. When the content is less than the lower limit value, the storage stability may be lowered, and when the content exceeds the upper limit value, the effect of improving the heat resistance may be lowered.

  Further, the third resin composition is not particularly limited, but may further contain a curing catalyst (curing accelerator). Thereby, the sclerosis | hardenability of the contact bonding layer 3 can be improved.

  Examples of the curing catalyst include amine catalysts such as imidazoles and 1,8-diazabicyclo (5,4,0) undecene, phosphorus catalysts such as triphenylphosphine, and the like. Of these, imidazoles are preferred. Thereby, especially quick curability and preservability can be made compatible.

  Examples of imidazoles include 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 2-phenyl-4-methylimidazole, 1-cyanoethyl-2- Phenylimidazolium trimellitate, 2,4-diamino-6- [2'-methylimidazolyl- (1 ')]-ethyl-s-triazine, 2,4-diamino-6- [2'-undecylimidazolyl- (1 ′)]-Ethyl-s-triazine, 2,4-diamino-6- [2′-ethyl-4′methylimidazolyl- (1 ′)]-ethyl-s-triazine, 2,4-diamino-6 -[2'-Methylimidazolyl- (1 ')]-ethyl-s-triazine isocyanuric acid adduct, 2-phenylimidazole Null acid adduct, 2-phenyl-4,5-dihydroxymethylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole, 2,4-diamino-6-vinyl-s-triazine, 2,4-diamino -6-vinyl-s-triazine isocyanuric acid adduct, 2,4-diamino-6-methacryloyloxyethyl-s-triazine, 2,4-diamino-6-methacryloyloxyethyl-s-triazine isocyanuric acid adduct, etc. Can be mentioned. Among these, 2-phenyl-4,5-dihydroxymethylimidazole or 2-phenyl-4-methyl-5-hydroxymethylimidazole is preferable. Thereby, the storage stability can be particularly improved.

  Further, the content of the curing catalyst is not particularly limited, but is preferably about 0.01 to 30 parts by mass, particularly about 0.5 to 10 parts by mass with respect to 100 parts by mass of the thermoplastic resin. More preferred. If the content is less than the lower limit, the curability may be insufficient, and if the content exceeds the upper limit, the storage stability may decrease.

  The average particle diameter of the curing catalyst is not particularly limited, but is preferably 10 μm or less, and more preferably 1 to 5 μm. When the average particle size is within the above range, the reactivity of the curing catalyst is particularly excellent.

  The third resin composition is not particularly limited, but may further contain a coupling agent. Thereby, the adhesiveness of resin, a to-be-adhered body, and a resin interface can be improved more.

  Examples of the coupling agent include a silane coupling agent, a titanium coupling agent, and an aluminum coupling agent. Of these, silane coupling agents are preferred. Thereby, heat resistance can be improved more.

  Among these, as the silane coupling agent, for example, vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropyltriethoxysilane, N-β (aminoethyl) γ-aminopropylmethyl Dimethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysila N-phenyl-γ-aminopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, bis (3 -Triethoxysilylpropyl) tetrasulfane and the like.

  Although content of a coupling agent is not specifically limited, It is preferable that it is about 0.01-10 mass parts with respect to 100 mass parts of thermoplastic resins, and it is more about 0.5-10 mass parts especially. preferable. If the content is less than the lower limit, the effect of adhesion may be insufficient, and if it exceeds the upper limit, it may cause outgassing or voids.

  In forming the adhesive layer 3, such a third resin composition is dissolved in a solvent such as methyl ethyl ketone, acetone, toluene, dimethylformaldehyde and the like to form a varnish, followed by a comma coater, a die coater, The adhesive layer 3 can be obtained by coating on a carrier film using a gravure coater or the like and drying.

  The average thickness of the adhesive layer 3 is not particularly limited, but is preferably about 3 to 100 μm, and more preferably about 5 to 70 μm. When the thickness is within the above range, it is particularly easy to control the thickness accuracy.

  Moreover, the 3rd resin composition may contain the filler as needed. By including the filler, the mechanical properties and adhesive strength of the adhesive layer 3 can be improved.

  Examples of the filler include particles of silver, titanium oxide, silica, mica, and the like.

  Moreover, it is preferable that the average particle diameter of a filler is about 0.1-25 micrometers. If the average particle size is less than the lower limit, the effect of filler addition is reduced, and if it exceeds the upper limit, the adhesive strength as a film may be reduced.

  Although content of a filler is not specifically limited, It is preferable that it is about 0.1-100 mass part with respect to 100 mass parts of thermoplastic resins, and it is more preferable that it is especially about 5-90 mass parts. Thereby, the adhesive force can be further increased while enhancing the mechanical properties of the adhesive layer 3.

(Support film)
The support film 4 is a support that supports the first adhesive layer 1, the second adhesive layer 2, and the adhesive layer 3 as described above.

  Examples of the constituent material of the support film 4 include polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polyvinyl chloride, vinyl chloride copolymer, polyethylene terephthalate, polybutylene terephthalate, polyurethane, and ethylene vinyl acetate copolymer. , Ionomer, ethylene / (meth) acrylic acid copolymer, ethylene / (meth) acrylic acid ester copolymer, polystyrene, vinyl polyisoprene, polycarbonate, etc., and one or a mixture of two or more of these Is mentioned.

  The average thickness of the support film 4 is not particularly limited, but is preferably about 5 to 200 μm, and more preferably about 30 to 150 μm. Thereby, since the support film 4 has moderate rigidity, the first adhesive layer 1, the second adhesive layer 2, and the adhesive layer 3 are reliably supported to facilitate the handling of the semiconductor film 10. At the same time, when the semiconductor film 10 is appropriately curved, adhesion to the semiconductor wafer 7 can be enhanced.

(Characteristics of semiconductor film)
Although the 1st adhesion layer 1, the 2nd adhesion layer 2, and the contact bonding layer 3 have mutually different adhesive force (adhesion force), it is preferable that they have the following characteristics.

  First, the adhesive force of the first adhesive layer 1 to the adhesive layer 3 is preferably smaller than the adhesive force of the second adhesive layer 2 to the wafer ring 9. Thereby, in the 3rd process mentioned later, when picking up the piece 83, between the adhesion layer 3 and the 1st adhesion layer 1 without peeling between the 2nd adhesion layer 2 and the wafer ring 9, Peels selectively. When dicing, the laminated body 8 can be reliably supported by the wafer ring 9.

  That is, in this embodiment, since the two adhesive layers of the 1st adhesion layer 1 and the 2nd adhesion layer 2 are used, by making each adhesive force differ, as above-mentioned, it is reliable of the laminated body 8. Therefore, it is possible to achieve both the simple fixing and the easy pickup of the piece 83. In other words, both dicing properties and pickup properties can be achieved.

  In the present invention, the adhesion between the adhesive layer 3 and the first adhesive layer 1 at 23 ° C. and 60 ° C. is 30 N / m or less as described above. For this reason, even when the temperature of the adhesive layer 3 is unintentionally raised due to the heat accumulated in the collet at the time of picking up at the time of die mounting, it is possible to pick up continuously and smoothly. As a result, it is possible to provide a semiconductor film capable of manufacturing a highly reliable semiconductor device while preventing the occurrence of defects in the semiconductor element.

  The adhesion force of the first adhesive layer 1 to the adhesive layer 3 and the adhesion force of the second adhesive layer 2 to the wafer ring 9 are the kind (composition) of the acrylic resin, the kind of monomer, and the content, respectively. It can be adjusted by changing the hardness or the like.

  In addition, “N / m”, which is a unit of the above-mentioned adhesion strength, is a 25 mm wide strip of a sample in which the adhesive layer 3 is pasted on the surface of the first adhesive layer 1, and then at 23 ° C. (room temperature) In the laminated film, the load (unit N) when the adhesive layer portion was peeled off at a peeling angle of 180 ° and a pulling speed of 1000 mm / min was a value converted per 1 m width (1000 mm / 25 mm = 40 times). That is, here, the adhesion force of the first adhesive layer 1 to the adhesive layer 3 will be described as 180 ° peel strength.

  As a composition of the 1st adhesion layer 1 which has the above characteristics, 1-50 mass parts of acrylate monomers and 0.1-10 mass parts of isocyanate compounds are mix | blended with respect to 100 mass parts of acrylic resins, for example. The thing which was done is mentioned.

  On the other hand, the adhesion force of the second adhesive layer 2 to the wafer ring 9 is not particularly limited, but is preferably about 100 to 2,000 N / m on the average of the adhesion interface, particularly about 400 to 1,200 N / m. More preferably. When the adhesion is within the above range, when the laminate 8 is expanded (expanded) as described later, or when the laminate 8 is diced, the interface between the first adhesive layer 1 and the second adhesive layer 2 is peeled off. As a result, the semiconductor element 71 is reliably prevented from falling off. Further, the laminated body 8 can be reliably supported by the wafer ring 9.

  In addition, “N / m”, which is a unit of the above-mentioned adhesion force, is a support film 4 in which a strip-shaped second adhesive layer 2 having a width of 25 mm is laminated so that the second adhesive layer 2 is in contact with the upper surface of the wafer ring 9. At 23 ° C. (room temperature), the support film 4 on which the second adhesive layer 2 was laminated was peeled off from the wafer ring 9 at a peeling angle of 180 ° and a pulling speed of 1000 mm / min. The load (unit N) is a value converted per 1 m width (1000 mm / 25 mm = 40 times). That is, here, the adhesion force of the second adhesive layer 2 to the wafer ring 9 will be described as 180 ° peel strength.

  As a composition of the 2nd adhesion layer 2 which has the above characteristics, 1-50 mass parts of urethane acrylate and 0.5-10 mass parts of isocyanate compounds are blended with respect to 100 mass parts of acrylic resin, for example. The thing which was done is mentioned.

Incidentally, the adhesion to the first adhesive layer 3 of the adhesive layer 1 and A _1, when the adhesion to the first adhesive layer 1 of the second adhesive layer 2 and the A _2, A 2 _/ A ₁ is not particularly limited However, it is preferable that it is about 5-200, and it is more preferable that it is about 10-50. Thereby, the 1st adhesion layer 1, the 2nd adhesion layer 2, and the contact bonding layer 3 become the thing especially excellent in dicing property and pick-up property.

  Further, the adhesion force of the first adhesive layer 1 to the adhesive layer 3 is preferably smaller than the adhesion force of the adhesive layer 3 to the semiconductor wafer 7. Thereby, when the piece 83 is picked up, it is possible to prevent the interface between the semiconductor wafer 7 and the adhesive layer 3 from being unintentionally peeled off. That is, peeling can be selectively caused at the interface between the first adhesive layer 1 and the adhesive layer 3.

  The adhesion force of the adhesive layer 3 to the semiconductor wafer 7 is not particularly limited, but is preferably about 50 to 500 N / m, and more preferably about 80 to 250 N / m. When the adhesion force is within the above range, it is possible to sufficiently prevent the occurrence of so-called “chip jump” in which the semiconductor element 71 flies off due to vibration or impact particularly during dicing.

  Here, “N / m”, which is a unit of the above-mentioned adhesion force, is a strip-shaped adhesive layer 3 having a width of 25 mm and a polyethylene terephthalate film (PET film) so that the adhesive layer 3 is in contact with the upper surface of the semiconductor wafer 7. The laminated laminate is pasted at 23 ° C. (room temperature), and then the load when the laminate is peeled off from the semiconductor wafer 7 at a peeling angle of 180 ° and a pulling speed of 1000 mm / min at 23 ° C. (room temperature). This is a value obtained by converting (unit N) per 1 m width (1000 mm / 25 mm = 40 times). That is, here, the adhesion force of the adhesive layer 3 to the semiconductor wafer 7 will be described as 180 ° peel strength.

  Moreover, it is preferable that the adhesive force with respect to the adhesive layer 3 of the 1st adhesive layer 1 is smaller than the adhesive force with respect to the 2nd adhesive layer 2 of the 1st adhesive layer 1. FIG. Thereby, when the piece 83 is picked up, it can prevent that the interface of the 1st adhesion layer 1 and the 2nd adhesion layer 2 peels unintentionally. That is, peeling can be selectively caused at the interface between the first adhesive layer 1 and the adhesive layer 3.

  In addition, although the adhesive force with respect to the 2nd adhesion layer 2 of the 1st adhesion layer 1 is not specifically limited, It is preferable that it is about 100-1,000 N / m, and it is more preferable that it is especially about 300-600 N / m. . When the adhesion is within the above range, the dicing property and the pickup property are particularly excellent.

  Here, “N / m”, which is a unit of the above-mentioned adhesion, is a 25 mm wide strip formed by laminating the first adhesive layer 1 on the surface of the second adhesive layer 2 on the support film 4. Then, at 23 ° C. (room temperature), the load (unit N) when the first adhesive layer 1 part was peeled off at a peeling angle of 180 ° and a pulling speed of 1000 mm / min in this laminated film was converted per 1 m width. (1000 mm / 25 mm = 40 times). That is, here, the adhesion force of the first adhesive layer 1 to the second adhesive layer 2 will be described as 180 ° peel strength.

(Manufacturing method of semiconductor film)
The semiconductor film 10 as described above is manufactured, for example, by the following method.

  First, the base material 4a shown in FIG. 4A is prepared, and the first adhesive layer 1 is formed on one surface of the base material 4a. Thereby, the laminated body 61 of the base material 4a and the 1st adhesion layer 1 is obtained. The first adhesive layer 1 is formed by applying the above-described resin varnish containing the first resin composition by various application methods and then drying the applied film, or laminating a film made of the first resin composition. It can be performed by a method or the like. Further, the coating film may be cured by irradiating radiation such as ultraviolet rays.

  Examples of the coating method include a knife coating method, a roll coating method, a spray coating method, a gravure coating method, a bar coating method, and a curtain coating method.

  Further, similarly to the laminated body 61, as shown in FIG. 4A, the adhesive layer 3 is formed on one surface of the prepared base material 4b, whereby the base material 4b and the adhesive layer 3 are formed. The laminate 62 is obtained.

  Further, in the same manner as each of the laminates 61 and 62, as shown in FIG. 4A, the second adhesive layer 2 is formed on one surface of the prepared support film 4, and thereby the support film 4 And the second adhesive layer 2 are obtained.

  Next, as illustrated in FIG. 4B, the stacked body 61 and the stacked body 62 are stacked so that the first adhesive layer 1 and the adhesive layer 3 are in contact with each other to obtain a stacked body 64. This lamination can be performed by, for example, a roll lamination method.

  Next, as shown in FIG. 4C, the base material 4 a is peeled from the laminate 64. And as shown in FIG.4 (d), the outer side part of the effective area | region of the said adhesive layer 3 and the said 1st adhesion layer 1 leaves the base material 4b with respect to the laminated body 64 which peeled the said base material 4a. Is removed in a ring shape. Here, the effective area refers to an area whose outer periphery is larger than the outer diameter of the semiconductor wafer 7 and smaller than the inner diameter of the wafer ring 9.

  Next, as shown in FIG. 4 (e), a laminate in which the base 4 a is peeled off and the outer portion of the effective area is removed in a ring shape so that the second adhesive layer 2 is in contact with the exposed surface of the first adhesive layer 1. 64 and the laminated body 63 are laminated. Then, the film 10 for semiconductors shown in FIG.4 (f) is obtained by peeling the base material 4b.

[Method for Manufacturing Semiconductor Device]
Next, a method for manufacturing the semiconductor device 100 using the semiconductor film 10 as described above (first embodiment of the method for manufacturing a semiconductor device of the present invention) will be described.

  The semiconductor device manufacturing method shown in FIGS. 1 to 3 includes a first step of laminating a semiconductor wafer 7 and a semiconductor film 10 to obtain a laminated body 8, and an outer peripheral portion 21 of the semiconductor film 10 with a wafer ring 9. The semiconductor wafer 7 and the adhesive layer 3 are separated into individual pieces by providing a cut 81 in the laminated body 8 from the side of the semiconductor wafer 7 (dicing), and a plurality of semiconductor elements 71 and adhesive layers 31 are formed. A second step of obtaining the piece 83; a third step of picking up at least one of the pieces 83; and a fourth step of obtaining the semiconductor device 100 by placing the picked piece 83 on the insulating substrate 5. It has these processes. Hereinafter, each step will be described in detail.

[1]
[1-1] First, a semiconductor wafer 7 and a semiconductor film 10 are prepared.
The semiconductor wafer 7 has a plurality of circuits formed on its surface in advance. Examples of the semiconductor wafer 7 include a silicon semiconductor, a compound semiconductor wafer such as gallium arsenide and gallium nitride.

  The average thickness of the semiconductor wafer 7 is not particularly limited, and is preferably about 0.01 to 1 mm, more preferably about 0.03 to 0.5 mm. According to the method for manufacturing a semiconductor device of the present invention, the semiconductor wafer 7 having such a thickness can be cut into pieces easily and reliably without causing defects such as chipping and cracking. .

  [1-2] Next, as shown in FIG. 1A, the semiconductor film 10 and the semiconductor wafer 7 are bonded to each other while the adhesive layer 3 of the semiconductor film 10 and the semiconductor wafer 7 are brought into close contact with each other. Are stacked (first step). Note that in the semiconductor film 10 shown in FIG. 1, the size and shape of the adhesive layer 3 in plan view are set in advance to be larger than the outer diameter of the semiconductor wafer 7 and smaller than the inner diameter of the wafer ring 9. Has been. For this reason, the entire lower surface of the semiconductor wafer 7 is in close contact with the entire upper surface of the adhesive layer 3, whereby the semiconductor wafer 7 is supported by the semiconductor film 10.

  As a result of the above lamination, as shown in FIG. 1B, a laminated body 8 in which the semiconductor film 10 and the semiconductor wafer 7 are laminated is obtained.

[2]
[2-1] Next, a wafer ring 9 is prepared. Subsequently, the stacked body 8 and the wafer ring 9 are stacked so that the upper surface of the outer peripheral portion 21 of the second adhesive layer 2 and the lower surface of the wafer ring 9 are in close contact with each other. Thereby, the outer peripheral part of the laminated body 8 is supported by the wafer ring 9.

  Since the wafer ring 9 is generally made of various metal materials such as stainless steel and aluminum, the wafer ring 9 has high rigidity and can surely prevent the laminate 8 from being deformed.

  By having two adhesive layers (first adhesive layer 1 and second adhesive layer 2) having different adhesiveness as described above, the semiconductor film 10 utilizes the difference in adhesiveness, Both dicing and pickup properties can be achieved.

  [2-2] Next, a dicer table (not shown) is prepared, and the laminate 8 is placed on the dicer table so that the dicer table and the support film 4 are in contact with each other.

  Subsequently, as shown in FIG. 1C, a plurality of cuts 81 are formed in the laminate 8 using a dicing blade 82 (dicing). The dicing blade 82 is composed of a disk-shaped diamond blade or the like, and a cut 81 is formed by pressing the dicing blade 82 against the surface of the laminated body 8 on the semiconductor wafer 7 side. Then, the semiconductor wafer 7 is separated into a plurality of semiconductor elements 71 by relatively moving the dicing blade 82 along the gap between the circuit patterns formed on the semiconductor wafer 7 (second step). ). Similarly, the adhesive layer 3 is divided into a plurality of adhesive layers 31. During such dicing, vibration and impact are applied to the semiconductor wafer 7, but the lower surface of the semiconductor wafer 7 is supported by the semiconductor film 10, so that the vibration and impact are alleviated. As a result, the occurrence of defects such as cracks and chippings in the semiconductor wafer 7 can be reliably prevented.

  The depth of the notch 81 is not particularly limited as long as it can penetrate the semiconductor wafer 7 and the adhesive layer 3. That is, the tip of the cut 81 only needs to reach any of the first adhesive layer 1, the second adhesive layer 2, and the support film 4. Thereby, the semiconductor wafer 7 and the adhesive layer 3 are surely separated into individual pieces, and the semiconductor element 71 and the adhesive layer 31 are formed, respectively.

  In the present embodiment, as shown in FIG. 1C, the case where the tip of the cut 81 is fastened in the first adhesive layer 1 will be described later.

[3]
[3-1] Next, the laminate 8 in which the plurality of cuts 81 are formed is radially expanded (expanded) by an expanding device (not shown). Thereby, as shown in FIG.1 (d), the width | variety of the notch 81 formed in the laminated body 8 spreads, and the space | interval of the semiconductor elements 71 separated into pieces is also expanded in connection with it. As a result, there is no possibility that the semiconductor elements 71 interfere with each other, and the individual semiconductor elements 71 can be easily picked up. Note that the expanding device is configured to maintain such an expanded state even in a process described later.

  [3-2] Next, the die bonder 250 shown in FIG. 2 attracts and pulls up one of the separated semiconductor elements 71 upward. As a result, as shown in FIG. 2 (e), the interface between the adhesive layer 31 and the first adhesive layer 1 is selectively peeled off, and an individual piece 83 formed by laminating the semiconductor element 71 and the adhesive layer 31 is picked up. (Third step).

[4]
[4-1] Next, the insulating substrate 5 for mounting (mounting) the semiconductor element 71 (chip) is prepared.

  Examples of the insulating substrate 5 include an insulating substrate on which a semiconductor element 71 is mounted and wiring and terminals for electrically connecting the semiconductor element 71 and the outside are provided.

Specifically, flexible substrates such as polyester copper-clad film substrates, polyimide copper-clad film substrates, aramid copper-clad film substrates, glass-based copper-clad laminates such as glass cloth and epoxy copper-clad laminates, and glass nonwoven fabrics -Composite copper-clad laminates such as epoxy copper-clad laminates, heat-resistant and thermoplastic substrates such as polyetherimide resin substrates, polyetherketone resin substrates, polysulfone resin substrates, alumina substrates, aluminum nitride substrates And ceramic substrates such as silicon carbide substrates, bismaleimide-triazine (BT) substrates, and the like.
Instead of the insulating substrate 5, a lead frame or the like may be used.

  Next, as shown in FIG. 2 (f), the picked-up pieces 83 are placed on the insulating substrate 5 by the die bonder 250.

Here, the die bonder 250 will be described.
The die bonder 250 shown in FIG. 2 picks up the piece 83 obtained through the dicing process and then transfers it onto the insulating substrate 5 described later.

  The die bonder 250 includes a collet (chip adsorbing portion) 260 that adsorbs the pieces 83, a heater 270 that heats the insulating substrate 5 from below, and an apparatus main body 280 that supports the collet 260. The collet 260 can move from the placement portion of the stacked body 8 to the placement portion of the insulating substrate 5 in a state where the individual pieces 83 are adsorbed.

  In this step, as shown in FIG. 2 (e), the piece 83 is picked up by the collet 260, and the piece 83 is placed on the insulating substrate 5. Then, the pieces 83 are bonded to the insulating substrate 5 by pressing the pieces 83 to the insulating substrate 5 while being heated by the heater 270 (see FIG. 2F).

  Note that the reason why the interface between the adhesive layer 31 and the first adhesive layer 1 is selectively peeled during such pickup is that the adhesiveness of the second adhesive layer 2 is the first adhesive layer 1 as described above. Therefore, the adhesive force at the interface between the support film 4 and the second adhesive layer 2 and the adhesive force at the interface between the second adhesive layer 2 and the first adhesive layer 1 are the same as those of the first adhesive layer 1. This is because the adhesive strength with the adhesive layer 3 is greater. That is, when the semiconductor element 71 is picked up, the interface between the first adhesive layer 1 and the adhesive layer 3 having the smallest adhesion force among these three locations is selectively peeled off.

  Further, when picking up the individual piece 83, the individual piece 83 to be picked up may be selectively pushed up from below the semiconductor film 10. Thereby, since the piece 83 is pushed up from the laminated body 8, the pickup of the piece 83 mentioned above can be performed more easily. In order to push up the individual piece 83, a needle-like body (needle) (not shown) that pushes up the semiconductor film 10 from below is used. That is, the die bonder 250 may have this needle-like body.

  [4-2] Next, as shown in FIG. 3G, the pieces 83 placed on the insulating substrate 5 are heated and pressure-bonded. As a result, the semiconductor element 71 and the insulating substrate 5 are bonded (die bonding) via the adhesive layer 31 (fourth step).

  As conditions for heating and pressure bonding, for example, the heating temperature is preferably about 100 to 300 ° C, and more preferably about 100 to 200 ° C. Further, the pressure bonding time is preferably about 1 to 10 seconds, and more preferably about 1 to 5 seconds.

  Moreover, you may heat-process after that. The heating conditions in this case are such that the heating temperature is preferably about 100 to 300 ° C., more preferably about 150 to 250 ° C., and the heating time is preferably about 1 to 240 minutes, more preferably about 10 to 60 minutes. The

  Thereafter, a terminal (not shown) of the semiconductor element 71 and a terminal (not shown) on the insulating substrate 5 are electrically connected by a wire 84. For this connection, instead of the wire 84, a conductive paste, a conductive film, or the like may be used.

  Then, the individual pieces 83 and the wires 84 placed on the insulating substrate 5 are covered with a resin material to form a mold layer 85. Examples of the resin material constituting the mold layer 85 include various mold resins such as an epoxy resin.

  Further, a semiconductor device as shown in FIG. 3 (h) in which a semiconductor element 71 is accommodated in a package by bonding a ball-shaped electrode 86 to a terminal (not shown) provided on the lower surface of the insulating substrate 5. 100 is obtained.

  According to the method as described above, in the third step, the adhesive layer 31 is picked up in the state where the adhesive layer 31 is attached to the semiconductor element 71, that is, in the state of the piece 83. Can be used for bonding to the insulating substrate 5 as they are. For this reason, it is not necessary to separately prepare an adhesive or the like, and the manufacturing efficiency of the semiconductor device 100 can be further increased.

  By the way, when the process of picking up the piece 83 by the die bonder 250 and then pressing the piece 83 to the insulating substrate 5 is repeated, the heat of the heater 270 is transmitted to the collet 260 through the piece 83 and gradually. Heat is stored. As a result, the collet 260 is heated, and the pickup that is supposed to be performed at room temperature is performed at a high temperature due to the influence of the heat. At this time, the temperature of the heated collet 260 generally rises to a temperature exceeding 60 ° C., although it depends on the temperature of the heater 270.

  If the temperature of the collet 260 rises, this time, the temperature of the collet 260 is also transmitted to the laminate 8 at the time of pickup, and the adhesiveness of the adhesive layer 3 in the laminate 8 may be unintentionally enhanced. is there. As a result, the individual pieces 83 that should have been separated by dicing may be adhered (attached) again as the adhesive layer 3 is increased in adhesion or reduced in viscosity, or peeled off during pickup. There is a possibility that the adhesion force at the interface between the adhesive layer 3 and the first pressure-sensitive adhesive layer 1 to be strengthened may cause a problem that smooth pickup becomes difficult.

  In response to this problem, the present inventor has intensively studied a semiconductor film that enables smooth pickup even if the temperature of the laminated body 8 rises unintentionally. As a result, the semiconductor having the adhesive layer as described above. The present inventors have found that the above-mentioned problems can be solved by using a film for use, and have completed the present invention.

  In other words, the semiconductor film 10 (semiconductor film of the present invention) contains a (meth) acrylic acid ester copolymer having a glass transition point of 0 ° C. or less as a constituent material (thermoplastic resin) of the adhesive layer 3. And the adhesive force between the contact bonding layer 3 and the adhesion layer (1st adhesion layer) in 23 degreeC and 60 degreeC is 30 N / m or less, It is characterized by the above-mentioned.

  According to such a film 10 for semiconductors, even if the temperature of the collet 260 rises at the time of picking up at room temperature, and the temperature of the laminated body 8 thereby rises, the picking up of the pieces 83 is smoothly performed. It can be carried out. For this reason, it is possible to reliably suppress the occurrence of problems (pickup defects) such as cracks and chips in the semiconductor element 71 during pickup. That is, the highly reliable semiconductor device 100 can be manufactured with a high manufacturing yield.

  On the other hand, when the adhesion at each temperature exceeds the upper limit, smooth pickup cannot be performed at room temperature.

  According to the semiconductor film 10 as described above, even if the temperature of the collet 260 of the die bonder 250 is increased, and the temperature of the laminated body 8 is increased accordingly, the significant increase in the adhesiveness of the adhesive layer 3 is suppressed, It is possible to prevent the pickup property from deteriorating.

  By the way, the manufacturing method of the semiconductor device of the present invention including the step of dicing the semiconductor wafer 7 using the semiconductor film 10 as described above is particularly characterized in the second step.

First, prior to the description of this feature, a conventional dicing process will be described.
The conventional dicing process is performed such that the tip of the dicing blade penetrates the semiconductor wafer, the adhesive layer, and each adhesive layer, and reaches the support film.

  However, as a result of the tip of the dicing blade reaching the support film, the support film is scraped, and shavings are generated. And this shavings will move to the periphery of each adhesion layer, the periphery of an adhesive layer, and the periphery of a semiconductor wafer, without staying around a support film, and will bring about various malfunctions. Specifically, when picking up a semiconductor element, the chip is caught, or in the fourth process described later, shavings enter between the insulating substrate and the semiconductor element, or the chips formed on the semiconductor wafer are scraped. May cause problems such as sticking and hindering wire bonding.

  In contrast, in the present invention, in the second step, the cutting depth is set so that the tip of the dicing blade 82 remains in the adhesive layer. In other words, the dicing is performed so that the tip of the cut 81 does not reach the support film 4 and remains in the first adhesive layer 1. If it does in this way, since the shavings of the support film 4 cannot generate | occur | produce, the problem accompanying the shavings as mentioned above will be eliminated reliably. That is, when the semiconductor element 71 is picked up, the occurrence of catching or the like is prevented, and when the picked-up semiconductor element 71 is mounted on the insulating substrate 5, the entry of foreign matters and the occurrence of defective wire bonding are prevented. As a result, the manufacturing yield of the semiconductor device 100 can be improved, and the highly reliable semiconductor device 100 can be obtained.

  In particular, by performing dicing so that the front end of the notch 81 is positioned in the first adhesive layer 1, the components of the second adhesive layer 2 can pass through the notch 81 and the periphery of the adhesive layer 3 or the semiconductor wafer 7. It is prevented from oozing out to the periphery. As a result, it is possible to prevent the exuded substance from unintentionally increasing the adhesion between the adhesive layer 3 and the first adhesive layer 1 and to prevent a problem that hinders the pickup of the piece 83. Can do. Furthermore, it is possible to prevent the exuded substance from causing deterioration or deterioration of the semiconductor element 71.

  Such exudation of the component inevitably causes the second adhesive layer 2 to be more flexible than the first adhesive layer 1 because the adhesiveness of the second adhesive layer 2 is stronger than the adhesiveness of the first adhesive layer 1. Therefore, the substance contained in the second adhesive layer 2 is considered to be a phenomenon caused by the fact that the fluidity and the outflow property are higher than those of the first adhesive layer 1. That is, as in this embodiment, the adhesive layer is composed of a plurality of layers, and the adhesive layer on the support film 4 side (in FIG. 1, the first adhesive layer 1 in FIG. 1) (the adhesive layer 3 side in FIG. 1). When the adhesiveness of the second adhesive layer 2) is strong, as shown in FIG. 1C, it is particularly effective to prevent the above-mentioned problems to keep the tip of the notch 81 in the first adhesive layer 1. .

  From the above viewpoint, the hardness of the second adhesive layer 2 is preferably smaller than the hardness of the first adhesive layer 1. Thereby, the second adhesive layer 2 is surely higher in adhesiveness than the first adhesive layer 1, while the first adhesive layer 1 is excellent in pick-up property.

  Moreover, it is preferable that the Shore D hardness of the 1st adhesion layer 1 is about 20-60, and it is more preferable that it is about 30-50. The first pressure-sensitive adhesive layer 1 having such hardness is moderately suppressed in adhesiveness, but relatively low in fluidity and flowability of components, so that the notch 81 is formed in the first pressure-sensitive adhesive layer 1. In addition, it is possible to achieve both improvement in pick-up property and prevention of troubles due to leaching of the substance from the first adhesive layer 1.

  Moreover, it is preferable that the Shore A hardness of the 2nd adhesion layer 2 is about 20-90, and it is more preferable that it is about 30-80. Since the second adhesive layer 2 having such hardness has sufficient adhesiveness, the fluidity and flowability of the components can be relatively suppressed, so that the dicing property (fixing of the laminate 8 and the wafer ring 9 in dicing) Property) and prevention of defects due to the exudation of substances.

From the above viewpoint, the cross-sectional area of the portion of the notch 81 on the tip side from the interface between the adhesive layer 3 and the first adhesive layer 1 is the thickness of the dicing blade 82, the adhesive layers 1, Although it differs depending on the thickness of 2, it is preferably about ^{5 to} 300 (× 10 ⁻⁵ mm ² ), more preferably about 10 to 200 (× 10 ⁻⁵ mm ² ). Of the cuts 81, by setting the cross-sectional area of the portion on the tip side from the interface between the adhesive layer 3 and the first adhesive layer 1 within the above range, the adhesive layer 3 is surely separated into pieces and the first adhesive The cross-sectional area of the cut portion with respect to the layer 1 can be minimized. As a result, it is possible to achieve both a reliable pickup of the individual pieces 83 and a suppression of the exudation of components from the first adhesive layer 1 at a high level.

  Moreover, when the film thickness of the 1st adhesion layer 1 is set to t, it is preferable that the depth of the part located in the 1st adhesion layer 1 among the notches 81 is 0.2t-0.8t, 0 More preferably, it is 3 to 0.7 t. Thereby, reliable pick-up of the piece 83 and suppression of the exudation of the component from the 1st adhesion layer 1 can be made to make compatible both more highly.

  As described above, the front end of the notch 81 is retained in the first adhesive layer 1, or even if not, the cross-sectional area of the front end side portion of the notch 81 from the interface between the adhesive layer 3 and the first adhesive layer 1 In the above range, the exudation of the component from the first adhesive layer 1 and the second adhesive layer 2 can be minimized, so that the exudation of this component adheres to the first adhesive layer 1. The influence on the adhesion with the layer 3 is also minimized. As a result, it is possible to prevent the close contact force from increasing unintentionally and hindering the pick-up property of the piece 83.

  Specifically, by controlling the depth, cross-sectional area, and the like of the notch 81, the adhesion between the first adhesive layer 1 and the adhesive layer 3 is reliably within the numerical range described above. As a result, the pick-up property of the individual piece 83 is particularly improved, and it is possible to prevent the semiconductor element 71 from suffering defects such as cracks, chips and burrs during pick-up. As a result, the highly reliable semiconductor device 100 can be finally manufactured with a high yield.

  In particular, when the thickness of the semiconductor wafer 7 is thin (for example, 200 μm or less), the adhesive force between the first adhesive layer 1 and the adhesive layer 3 is within the above range, so that the semiconductor element 71 has the above-described state. The effect of preventing various problems becomes remarkable.

  In addition, the adhesion between the first adhesive layer 1 and the adhesive layer 3 is often different between the central portion and the edge portion (edge portion) of each individual piece 83. This is due to the fact that, at the edge, the component in the first adhesive layer 1 crawls up on the end face of the piece 83 and the adhesive force tends to increase compared to the central portion. For this reason, when picking up the individual piece 83, the adhesive force is greatly different between the center portion and the edge portion, which may cause cracking or chipping of the semiconductor element 71.

  On the other hand, according to the present invention, by controlling the dicing depth so that the tip of the notch 81 stays in the first adhesive layer 1, the range of variation in the adhesion force of the individual pieces 83 is kept small. It becomes possible. For this reason, when picking up the individual piece 83, it is possible to prevent the semiconductor element 71 from being cracked or chipped.

  Here, when the piece 83 is peeled off, the load applied to the edge of the piece 83 (edge contact force) is defined as a, and the load applied to the center of the piece 83 (center contact force) is defined as b. The a / b is preferably 1 or more and 4 or less, more preferably about 1 to 3, and still more preferably about 1 to 2. As a result, the variation in the load of each part of the semiconductor element 71 is suppressed to a relatively narrow range, so that the occurrence of defects such as cracking and chipping of the semiconductor element 71 during pickup is surely suppressed. be able to. By using the semiconductor film 10 as described above, the manufacturing yield of the semiconductor device 100 can be improved, and the highly reliable semiconductor device 100 can be finally obtained.

The adhesion force a and the adhesion force b are measured in detail as follows.
First, after laminating the semiconductor film 10 and the semiconductor wafer 7 to obtain the laminated body 8, the lamination before performing the third step in a state after the semiconductor wafer 7 is separated into 10 mm × 10 mm squares. A strip-shaped adhesive film having a width of 1 cm is attached to the upper surface of the body 8 at 23 ° C. (room temperature).

  Next, at 23 ° C. (room temperature), the first adhesive layer 1, the second adhesive layer 2 and the support film 4 are peeled off from the laminate 8 at a peeling angle of 90 ° and a pulling speed of 50 mm / min. At this time, the magnitude of the tensile load (unit N) applied to the first adhesive layer 1, the second adhesive layer 2, and the support film 4 while peeling off the first adhesive layer 1, the second adhesive layer 2, and the support film 4 is determined. taking measurement. And the average value of the tensile load applied to the first adhesive layer 1, the second adhesive layer 2, and the support film 4 when the edge of the piece 83 is separated from the first adhesive layer 1 corresponds to the “adhesion force a”. The average value of the tensile load applied to the first adhesive layer 1, the second adhesive layer 2, and the support film 4 when the central portion (portion other than the edge portion) of the piece 83 is separated from the first adhesive layer 1 is “adhesion force b”. Is equivalent to.

  That is, according to the semiconductor film 10, when the edge of the piece 83 is about to be separated from the first adhesive layer 1, and when the center portion of the piece 83 is about to be separated from the first adhesive layer 1, Since the difference in the magnitude of the tensile load applied to the first adhesive layer 1, the second adhesive layer 2, and the support film 4 can be suppressed to be relatively small, even if the semiconductor element 71 is warped during pick-up, the warp Will be minimized. As a result, problems such as cracks and chipping of the semiconductor element 71 can be minimized.

  Moreover, it is preferable that the adhesive force b of the center part (parts other than an edge part) of the piece 83 exists in the range of the adhesive force of the 1st adhesion layer 1 and the contact bonding layer 3 mentioned above.

  In particular, when the thickness of the semiconductor wafer 7 is thin (for example, 200 μm or less), the effect of preventing the above-described problems occurring in the semiconductor element 71 becomes remarkable by setting the adhesion force b within the above range.

  The edge of the piece 83 refers to a region that is 10% or less of the width of the semiconductor element 71 from the outer edge of the semiconductor element 71. On the other hand, the central portion of the piece 83 refers to a region other than the edge portion. That is, when the shape of the semiconductor element 71 is, for example, a 10 mm square in a plan view, a region 1 mm wide from the outer edge is an edge, and the remaining region is a center.

  Further, in the present embodiment, the semiconductor wafer 7 and the adhesive layer 3 are surely separated into pieces by retaining the tip of the cut 81 in the first adhesive layer 1, while the first adhesive layer 1 and the second adhesive layer 2 is not singulated. Therefore, when picking up the piece 83 in the third step, the first adhesive layer 1 and the second adhesive layer 2 should be left on the support film 4 side, but unintentionally stuck to the piece 83 side. Picking up in a state can be prevented. This is because, since the first adhesive layer 1 and the second adhesive layer 2 are not separated into individual pieces, the connection in the surface direction is maintained, so that the adhesion between the first adhesive layer 1 and the second adhesive layer 2 is maintained. This is because a decrease in the adhesion between the second adhesive layer 2 and the support film 4 is prevented. That is, the adhesive force between the first adhesive layer 1 and the second adhesive layer 2 and the adhesive force between the second adhesive layer 2 and the support film 4 have sufficient resistance against the upward pulling force in the pickup. Because.

  As mentioned above, although the film for semiconductors of this invention and the manufacturing method of a semiconductor device were demonstrated based on embodiment of illustration, this invention is not limited to these.

  For example, the package form is a CSP (Chip Size Package) such as BGA (Ball Grid Array) or LGA (Land Grid Array), a surface mount type package such as TCP (Tape Carrier Package), or DIP (Dual Inline Package). Further, it may be an insertion type package such as PGA (Pin Grid Array), and is not particularly limited.

  In the above-described embodiment, the case where the piece 83 is mounted on the insulating substrate 5 has been described. However, the piece 83 may be mounted on another semiconductor element. That is, the method for manufacturing a semiconductor device of the present invention can also be applied to manufacturing a chip stack type semiconductor device in which a plurality of semiconductor elements are stacked. Thereby, there is no possibility of pick-up failure or the possibility of chips entering between the semiconductor elements, and a highly reliable chip stack type semiconductor device can be manufactured with a high manufacturing yield.

  In the above-described embodiment, the case where the cut 81 is formed so that the tip remains in the first adhesive layer 1 is described. However, the cut 81 is formed so that the tip stays in the second adhesive layer 2. Even in this case, although the effect of suppressing the exudation of the substance is slightly reduced, the same operation and effect as those of the second embodiment can be obtained.

  In the above-described embodiment, the adhesive layer has a two-layer structure. However, the present invention is not limited to this, and may be one layer or three or more layers.

  Moreover, in the method for manufacturing a semiconductor device of the present invention, an optional step can be added as necessary.

Hereinafter, specific examples of the present invention will be described.
1. Manufacturing of a semiconductor device (Example 1)
<1> Formation of First Adhesive Layer 100 parts by mass of a copolymer having a weight average molecular weight of 300,000 obtained by copolymerizing 30% by mass of 2-ethylhexyl acrylate and 70% by mass of vinyl acetate, and a molecular weight of 700 Peeling treatment of 45 parts by mass of pentafunctional acrylate monomer, 5 parts by mass of 2,2-dimethoxy-2-phenylacetophenone, and 3 parts by mass of tolylene diisocyanate (Coronate T-100, manufactured by Nippon Polyurethane Industry Co., Ltd.) It apply | coated so that the thickness after drying might be set to 10 micrometers with respect to the 38-micrometer-thick polyethylene terephthalate film, and it dried at 80 degreeC after that for 5 minutes. And the ultraviolet-ray 500mJ / cm < ² > was irradiated with respect to the obtained coating film, and the 1st adhesion layer was formed into a film on the polyethylene terephthalate film.
In addition, the Shore D hardness of the obtained 1st adhesion layer was 40.

<2> Formation of Second Adhesive Layer 100 parts by mass of a copolymer having a weight average molecular weight of 500,000 obtained by copolymerizing 70% by mass of butyl acrylate and 30% by mass of 2-ethylhexyl acrylate, and tolylene 3 parts by mass of isocyanate (Coronate T-100, manufactured by Nippon Polyurethane Industry Co., Ltd.) was applied to a polyethylene terephthalate film having a thickness of 38 μm which was subjected to a release treatment so that the thickness after drying was 10 μm. And dried at 80 ° C. for 5 minutes. And the 2nd adhesion layer was formed into a film on the polyethylene terephthalate film. Thereafter, a polyethylene sheet having a thickness of 100 μm was laminated as a support film.
In addition, the Shore A hardness of the obtained 2nd adhesion layer was 80.

<3> Formation of Adhesive Layer Acrylic ester copolymer (ethyl acrylate-butyl acrylate-acrylonitrile-acrylic acid-hydroxyethyl methacrylate copolymer methyl ethyl ketone (MEK) / toluene as (meth) acrylic ester copolymer Dissolved product, Nagase ChemteX Corp. SG-70L, glass transition point: -17 ° C, weight average molecular weight: 800,000) as a solid component, 100 parts by mass, phenoxy resin (YX6954, Mw: 40,000, Mitsubishi) 10 parts by mass made by Kagaku Co., Ltd., glass transition point: 130 ° C., 115 parts by mass of spherical silica (SC1050, average particle size 0.3 μm, manufactured by Admatex) as an inorganic filler (filler), and coupling agent Γ-glycidoxypropyltrimethoxysilane (KBM4 3E, a Shin-Etsu Chemical Co., Ltd.) 1.1 parts by weight, and dissolved in methyl ethyl ketone to obtain a resin solid content of 20% by weight of the resin varnish.

  Next, the obtained resin varnish was applied to a polyethylene terephthalate film (manufactured by Teijin DuPont, product number Purex A43, thickness 38 μm) with a comma coater, and then dried at 150 ° C. for 3 minutes to form a polyethylene terephthalate film. An adhesive layer having a thickness of 20 μm was formed.

<4> Manufacture of a film for semiconductor A film in which a first adhesive layer is formed and a film in which an adhesive layer is formed are laminated (laminated) so that the first adhesive layer and the adhesive layer are in contact with each other. The layer-side polyethylene terephthalate film was peeled off to obtain a laminate.

  Next, using a roll-shaped die, the first adhesive layer and the adhesive layer are punched out to be larger than the outer diameter of the semiconductor wafer and smaller than the inner diameter of the wafer ring, and then unnecessary portions are removed, and the second laminated body is removed. Got.

  Further, the polyethylene terephthalate film on one surface side of the second adhesive layer is peeled off. And these were laminated | stacked so that the 1st adhesion layer and 2nd adhesion layer of a said 2nd laminated body might contact | connect. Thereby, the film for semiconductors obtained by laminating five layers of the polyethylene sheet (support film), the second adhesive layer, the first adhesive layer, the adhesive layer, and the polyethylene terephthalate film in this order was obtained.

<5> Manufacturing of Semiconductor Device Next, a silicon wafer having a thickness of 100 μm and 8 inches was prepared.

  And the polyethylene terephthalate film was peeled from the film for semiconductors, and the silicon wafer was laminated | stacked at 60 degreeC on the peeling surface. Thereby, the laminated body formed by laminating | stacking 5 layers of a polyethylene sheet (support film), a 2nd adhesion layer, a 1st adhesion layer, an adhesion layer, and a silicon wafer in this order was obtained.

  Next, the laminate was diced (cut) from the silicon wafer side using a dicing saw (DFD6360, manufactured by DISCO Corporation) under the following conditions. As a result, the silicon wafer was singulated, and a semiconductor element having the following dicing size was obtained.

<Dicing conditions>
・ Dicing size: 10 mm × 10 mm square ・ Dicing speed: 50 mm / sec
・ Spindle speed: 40,000 rpm
・ Maximum depth of dicing: 0.130 mm (the amount of cut from the surface of the silicon wafer)
・ Dicing blade thickness: 15μm
・ Cross sectional area: 7.5 × 10 ⁻⁵ mm ² (cross sectional area at the tip side from the interface between the adhesive layer and the first adhesive layer)

  In addition, the notch formed by this dicing had the front-end | tip reached in the 1st adhesion layer.

Here, in order to evaluate the pickup property of the semiconductor element, 180 ° peel strength (adhesion force) between the adhesive layer and the first adhesive layer was measured. This peel strength is obtained when the adhesive film for a semiconductor is made into a strip having a width of 25 mm, and then the adhesive layer portion is peeled off at 23 ° C. (room temperature) at a peeling angle of 180 ° and a pulling speed of 1000 mm / min. Load. Note that peeling in the laminate occurred at the interface between the first adhesive layer and the adhesive layer.
As a result of this measurement, the peel strength (adhesion strength) at 23 ° C. was 16 N / m.

Next, the temperature of the laminate was raised to 60 ° C., and the peel strength was measured in the same manner as in the case of 23 ° C.
As a result of this measurement, the peel strength (adhesion strength) at 60 ° C. was 6 N / m.

  Thereafter, the above semiconductor element was used on a bismaleimide-triazine resin substrate (circuit level difference: 5 to 10 μm) coated with a solder resist (manufactured by Taiyo Ink Manufacturing Co., Ltd., trade name: AUS308) using a die bonder (manufactured by ASM, AD898). The quality when 100 semiconductor elements were picked up continuously was evaluated at a die mount temperature of 23 ° C. and 130 ° C., respectively.

  As a result, all 100 pickups were good under both the die mount temperature conditions of 23 ° C. and 130 ° C.

  Next, the picked-up piece is applied to a bismaleimide-triazine resin substrate (circuit level difference: 5 to 10 μm) coated with a solder resist (manufactured by Taiyo Ink Manufacturing Co., Ltd., trade name: AUS308) at a temperature of 130 ° C. and a load of 5 N. For 1.0 second and die bonded.

Next, the semiconductor element and the resin substrate were electrically connected by wire bonding.
Then, the semiconductor element and the bonding wire on the resin substrate were sealed with a sealing resin EME-G760 (trade name, manufactured by Sumitomo Bakelite Co., Ltd.), and further subjected to a heat treatment at a temperature of 175 ° C. for 2 hours. Thereby, the sealing resin was cured to obtain a semiconductor device. Note that 100 semiconductor devices were manufactured in this example.

(Example 2)
A semiconductor device was manufactured in the same manner as in Example 1 except that jER1256 (manufactured by Mitsubishi Chemical Corporation, Mw: 55,000, glass transition point: 98 ° C.) was used as the phenoxy resin in the adhesive layer.

By the way, about the adhesive film for semiconductors, it carried out similarly to Example 1, and measured 180 degree peel strength (adhesion force) between an adhesive layer and a 1st adhesion layer.
As a result of this measurement, the peel strength (adhesion strength) at 23 ° C. was 27 N / m.

Next, the temperature of the laminate was sequentially raised to 40 ° C. and 60 ° C. At each temperature, the peel strength was measured in the same manner as at 23 ° C.
As a result of this measurement, the peel strength (adhesion strength) at 60 ° C. was 20 N / m.

  Moreover, the said semiconductor element was used for the bismaleimide-triazine resin board | substrate (circuit level | step difference 5-10 micrometers) which coated the soldering resist (The Taiyo Ink Manufacturing Co., Ltd. brand name: AUS308) using the die bonder (ASM company make, AD898). The quality when 100 semiconductor elements were picked up continuously was evaluated at a die mount temperature of 23 ° C. and 130 ° C., respectively.

  As a result, all 100 pickups were good under both the die mount temperature conditions of 23 ° C. and 130 ° C.

(Example 3)
An acrylic ester copolymer in the adhesive layer having a polymerization ratio of 52 mol% ethyl acrylate, 24 mol% butyl acrylate, 20 mol% acrylonitrile, 2.0 mol% acrylic acid, and 2.0 mol% hydroxyethyl methacrylate (glass transition point: A semiconductor device was manufactured in the same manner as in Example 1 except that −10 ° C. and weight average molecular weight: 750,000) were used.

By the way, about the adhesive film for semiconductors, it carried out similarly to Example 1, and measured 180 degree peel strength (adhesion force) between an adhesive layer and a 1st adhesion layer.
As a result of this measurement, the peel strength (adhesion strength) at 23 ° C. was 22 N / m.

Next, the temperature of the laminate was sequentially raised to 40 ° C. and 60 ° C. At each temperature, the peel strength was measured in the same manner as at 23 ° C.
As a result of this measurement, the peel strength (adhesion strength) at 60 ° C. was 25 N / m.

  Moreover, the said semiconductor element was used for the bismaleimide-triazine resin board | substrate (circuit level | step difference 5-10 micrometers) which coated the soldering resist (The Taiyo Ink Manufacturing Co., Ltd. brand name: AUS308) using the die bonder (ASM company make, AD898). The quality when 100 semiconductor elements were picked up continuously was evaluated at a die mount temperature of 23 ° C. and 130 ° C., respectively.

  As a result, all 100 pickups were good under both the die mount temperature conditions of 23 ° C. and 130 ° C.

Example 4
An acrylic ester copolymer in the adhesive layer having a polymerization ratio of 62 mol% ethyl acrylate, 24 mol% butyl acrylate, 10 mol% acrylonitrile, 2.0 mol% acrylic acid, and 2.0 mol% hydroxyethyl methacrylate (glass transition point: A semiconductor device was manufactured in the same manner as in Example 1 except that −20 ° C. and weight average molecular weight: 750,000) were used.

By the way, about the adhesive film for semiconductors, it carried out similarly to Example 1, and measured 180 degree peel strength (adhesion force) between an adhesive layer and a 1st adhesion layer.
As a result of this measurement, the peel strength (adhesion strength) at 23 ° C. was 25 N / m.

Next, the temperature of the laminate was sequentially raised to 40 ° C. and 60 ° C. At each temperature, the peel strength was measured in the same manner as at 23 ° C.
As a result of this measurement, the peel strength (adhesion strength) at 60 ° C. was 16 N / m.

  Moreover, the said semiconductor element was used for the bismaleimide-triazine resin board | substrate (circuit level | step difference 5-10 micrometers) which coated the soldering resist (The Taiyo Ink Manufacturing Co., Ltd. brand name: AUS308) using the die bonder (ASM company make, AD898). The quality when 100 semiconductor elements were picked up continuously was evaluated at a die mount temperature of 23 ° C. and 130 ° C., respectively.

  As a result, all 100 pickups were good under both the die mount temperature conditions of 23 ° C. and 130 ° C.

(Comparative Example 1)
SG-708-6 (ethyl acrylate-butyl acrylate-acrylonitrile-acrylic acid-hydroxyethyl methacrylate copolymer methyl ethyl ketone (MEK) dissolved product, manufactured by Nagase ChemteX Corporation) as an acrylate ester copolymer in the adhesive layer A semiconductor device was manufactured in the same manner as in Example 1 except that glass transition point: 6 ° C., weight average molecular weight: 500,000) was used.

By the way, about the adhesive film for semiconductors, it carried out similarly to Example 1, and measured 180 degree peel strength (adhesion force) between an adhesive layer and a 1st adhesion layer.
As a result of this measurement, the peel strength (adhesion strength) at 23 ° C. was 14 N / m.

Next, the temperature of the laminate was raised to 60 ° C., and the peel strength was measured in the same manner as in the case of 23 ° C.
As a result of this measurement, the peel strength (adhesion strength) at 60 ° C. was 40 N / m.

  Moreover, the said semiconductor element was used for the bismaleimide-triazine resin board | substrate (circuit level | step difference 5-10 micrometers) which coated the soldering resist (The Taiyo Ink Manufacturing Co., Ltd. brand name: AUS308) using the die bonder (ASM company make, AD898). The quality when 100 semiconductor elements were picked up continuously was evaluated at a die mount temperature of 23 ° C. and 130 ° C., respectively.

  As a result, at the die mount temperature of 23 ° C., all 100 pickups were good, but at the die mount temperature of 130 ° C., all pickup failures occurred.

(Comparative Example 2)
SG-708-6 (ethyl acrylate-butyl acrylate-acrylonitrile-acrylic acid-hydroxyethyl methacrylate copolymer methyl ethyl ketone (MEK) dissolved product, manufactured by Nagase ChemteX Corporation) as an acrylate ester copolymer in the adhesive layer A semiconductor device was manufactured in the same manner as in Example 2 except that glass transition point: 6 ° C., weight average molecular weight: 500,000) was used.

By the way, about the adhesive film for semiconductors, it carried out similarly to Example 1, and measured 180 degree peel strength (adhesion force) between an adhesive layer and a 1st adhesion layer.
As a result of this measurement, the peel strength (adhesion strength) at 23 ° C. was 10 N / m.

Next, the temperature of the laminate was raised to 60 ° C., and the peel strength was measured in the same manner as in the case of 23 ° C.
As a result of this measurement, the peel strength (adhesion strength) at 60 ° C. was 32 N / m.

  Moreover, the said semiconductor element was used for the bismaleimide-triazine resin board | substrate (circuit level | step difference 5-10 micrometers) which coated the soldering resist (The Taiyo Ink Manufacturing Co., Ltd. brand name: AUS308) using the die bonder (ASM company make, AD898). The quality when 100 semiconductor elements were picked up continuously was evaluated at a die mount temperature of 23 ° C. and 130 ° C., respectively.

  As a result, at the die mount temperature of 23 ° C., all 100 pickups were good, but at the die mount temperature of 130 ° C., all pickup failures occurred.

2. Evaluation of Dicing Property and Pickup Property Table 1 shows the production conditions of the adhesive layer and the evaluation result of the pickup in each example and each comparative example.

  The dicing property in each example and each comparative example was good. That is, no chipping or peeling of the semiconductor element occurred during dicing.

  Further, as apparent from Table 1, it was found that in each of the examples, the semiconductor element (piece) can be stably picked up. Further, stable pickup was possible regardless of the die mount temperature (23 ° C. or 130 ° C.) at the time of pickup. Therefore, according to each embodiment, even if the die bonder collet is heated, and the temperature of the laminated body rises at the time of pick-up, it is possible to suppress the adhesion of the adhesive layer from being significantly enhanced by heat. As a result, it has been clarified that a pickup failure can be prevented.

  On the other hand, in each comparative example, many pick-up defects occurred when die-mounted at a high temperature. This indicates that in the comparative example, when the collet of the die bonder is heated, a large number of pickup failures can occur.

DESCRIPTION OF SYMBOLS 1 1st adhesion layer 11 Outer periphery 2 2nd adhesion layer 21 Outer peripheral part 3, 31 Adhesive layer 4 Support film 41 Outer peripheral part 4a, 4b Base material 5 Insulating substrate 61-64 Laminated body 7 Semiconductor wafer 71 Semiconductor element 8 Laminated body 81 Notch 82 Dicing blade 83 pieces 84 Wire 85 Mold layer 86 Ball-shaped electrode 9 Wafer ring 10 Semiconductor film 100 Semiconductor device 200 Laminate 210 Adhesive sheet 211 Base film 212 First adhesive layer 213 Second viscosity Adhesive layer 220 Semiconductor wafer 230 Pieces 240 Substrate 250 Die bonder 260 Collet 270 Heater 280 Device body

Claims (14)

An adhesive layer, at least one adhesive layer and a support film are laminated in this order, and a semiconductor wafer is laminated on the surface of the adhesive layer opposite to the adhesive layer, and in this state, the semiconductor wafer and the adhesive film are laminated. It is a film for a semiconductor that is used when a layer is cut into individual pieces, and the obtained individual pieces are picked up from the support film,
As a constituent material of the adhesive layer, it includes a (meth) acrylic acid ester copolymer having a glass transition point of 0 ° C. or lower,
The film for semiconductors characterized by the adhesive force between the said adhesion layer and the said adhesion layer in 23 degreeC and 60 degreeC being 30 N / m or less.   The film for semiconductor according to claim 1, wherein the (meth) acrylic acid ester copolymer has a weight average molecular weight of 100,000 or more.   The film for semiconductors of Claim 1 or 2 containing a phenoxy resin as a constituent material of the said contact bonding layer.   The film for semiconductor according to claim 3, wherein the glass transition point of the phenoxy resin is 90 ° C. or higher.   The film for semiconductor according to claim 3 or 4, wherein the phenoxy resin has a weight average molecular weight of 30,000 to 80,000.   The film for a semiconductor according to claim 1, wherein the adhesive layer is composed of a plurality of layers.   The plurality of layers include a first adhesive layer located on the semiconductor wafer side, and a second adhesive layer adjacent to the support film side of the first adhesive layer and having higher adhesiveness than the first adhesive layer. The film for semiconductors of Claim 6 which contains.   The film for a semiconductor according to claim 7, wherein an outer peripheral edge of the adhesive layer and an outer peripheral edge of the first adhesive layer are respectively located on an inner side than an outer peripheral edge of the second adhesive layer.   The film for semiconductor according to claim 7 or 8, wherein the hardness of the second adhesive layer is smaller than the hardness of the first adhesive layer.   The film for a semiconductor according to any one of claims 7 to 9, wherein the first adhesive layer has a Shore D hardness of 20 to 60.   The film for semiconductor according to any one of claims 1 to 10, wherein a region where the semiconductor wafer is laminated on a surface of the adhesive layer on the adhesive layer side is irradiated with ultraviolet rays in advance prior to lamination with the semiconductor wafer. . A first step of preparing a laminate formed by laminating the semiconductor film and the semiconductor wafer so that the adhesive layer of the semiconductor film according to claim 1 and the semiconductor wafer are in contact with each other. ,
A second step of obtaining a plurality of semiconductor elements by dividing the semiconductor wafer into pieces by providing a cut in the stacked body from the semiconductor wafer side;
And a third step of picking up the semiconductor element.   The method of manufacturing a semiconductor device according to claim 12, wherein the cut is provided so that a deepest portion thereof is located in the adhesive layer. 14. The cross-sectional area of a portion on the tip side from the interface between the adhesive layer and the pressure-sensitive adhesive layer in one notch is 5 × 10 ^{−5 to} 300 × 10 ⁻⁵ mm ² . A method for manufacturing a semiconductor device.

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