TW201627452A - Adhesive sheet, adhesive sheet with dicing sheet and method of manufacturing semiconductor device - Google Patents

Abstract

The purpose of the present invention is to provide an adhesive sheet that is possible to cure in a short period of time, reduce the poor bonding between the copper wire and the pad, and prevent from rupture of the semiconductor wafer, and an adhesive sheet with a dicing sheet. The present invention relates to an adhesive sheet, which is heated from 25DEG C to 175DEG C in 3 minutes and maintained at 175DEG C for 3 hours. Under this condition, the DSC curve depicted in a DSC measurement reveals that the time from the reach of 175DEG C to the disappearance of the reaction peak is less than 30 minutes. The cured product obtained by curing at 175DEG C and 10 Hz for 30 minutes is subject to viscoelasticity testing, and the tensile elastic coefficient measured at 200DEG C is more than 100 MPa. The present invention relates to an adhesive sheet with a dicing sheet, which includes a dicing sheet consisting of a substrate and an adhesive layer disposed on the substrate and an adhesive sheet disposed on the adhesive layer.

Description

Substrate, subsequent sheet with dicing sheet, and method of manufacturing semiconductor device

The present invention relates to a bonding sheet, a bonding sheet with a dicing sheet, and a method of manufacturing a semiconductor device.

As a method of the semiconductor device, for example, a method of fixing a semiconductor wafer with a subsequent sheet to a adherend such as a lead frame, a method of curing a subsequent sheet, and a method of soldering a semiconductor device are known. (For example, refer to Patent Document 1).

In recent years, the transition from wire bonding using gold wires to wire bonding using inexpensive copper wires has been carried out. Further, in consideration of the miniaturization of the semiconductor device, the semiconductor wafer has been miniaturized.

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-53190

Since the copper wire is easily oxidized, it is difficult to follow the pad of the semiconductor wafer, and the molten ball is hard. Therefore, in the wire bonding using the copper wire, the semiconductor wafer is easily vibrated by the ultrasonic waves emitted from the wire bonding apparatus, and the bonding failure of the copper wire and the pad is likely to occur, and the wafer is broken. Since a small semiconductor wafer having a small area in contact with the lead frame is easily vibrated, it is particularly likely to cause bonding failure and wafer breakage.

An object of the present invention is to solve the above problems and to provide a subsequent sheet which can be cured in a short period of time, which can reduce bonding failure between a copper wire and a pad, cracking of a semiconductor wafer, and a bonding sheet with a dicing sheet. Another object of the present invention is to provide a method of manufacturing a semiconductor device which can cure a bonding sheet in a short period of time, can reduce bonding failure between a copper wire and a pad, and break a semiconductor wafer.

The present invention relates to a follower sheet used in the manufacture of a semiconductor device. The succeeding sheet of the present invention has the following properties. That is, in the DSC curve measured by DSC under the conditions of raising the temperature from 25 ° C to 175 ° C for 3 minutes and then maintaining 175 ° C for 3 hours, the time from reaching 175 ° C until the reaction peak disappeared was less than 30 minutes. . Since the time from the arrival of 175 ° C to the disappearance of the reaction peak is less than 30 minutes, it can be cured in a short time. The succeeding sheet of the present invention further has the following properties. That is, the viscoelasticity of the cured product obtained by curing at 175 ° C for 30 minutes was measured at 10 Hz, and the tensile modulus at 200 ° C obtained was 100 MPa or more. Due to the tensile modulus of 200 ° C Since it is 100 MPa or more, the vibration of the semiconductor wafer can be reduced, and the bonding failure of the copper wire and the pad and the crack of the semiconductor wafer can be reduced.

The succeeding sheet of the present invention preferably further has the following properties. In other words, the heat of reaction obtained by DSC measurement under the conditions of raising the temperature at 10 ° C per minute in the range of 25 ° C to 300 ° C is preferably 80 mJ / mg or more.

The succeeding sheet of the present invention preferably further has the following properties. That is, the Tg of the cured product obtained by curing at 175 ° C for 30 minutes is preferably 150 ° C or higher.

The succeeding sheet of the present invention preferably contains a cerium oxide filler having a BET specific surface area of 4 m ² /g or more. The content of the cerium oxide filler is preferably 50% by weight or more.

The succeeding sheet of the present invention contains a resin component. The preferred resin component comprises an epoxy resin, a phenolic resin, and an acrylic resin. More preferably, the content of the acrylic resin in 100% by weight of the resin component is 14% by weight or less. The hydroxyl equivalent of the phenol resin is preferably 120 g/eq. or less.

The present invention still further relates to a back sheet comprising a dicing sheet comprising a dicing sheet comprising a substrate and an adhesive layer disposed on the substrate, and a back sheet disposed on the adhesive layer.

The present invention further relates to a method of fabricating a semiconductor device, comprising: a step of preparing a subsequent sheet with a dicing sheet, and a step of crimping a semiconductor wafer on a subsequent sheet; and cutting a semiconductor crystal disposed on the subsequent sheet Step of forming a die-bonding wafer including a semiconductor wafer having a pad and an adhesive film disposed on the semiconductor wafer And a step of forming a wafer-attached adherend by crimping the die-bonding wafer on the adherend having the terminal portion, and a step of curing the adhesive film by heating the adherend to which the wafer is attached And a step of bonding one end of the metal wire including copper to the pad and a step of bonding the other end of the metal wire to the terminal portion, which is performed after the step of curing the adhesive film.

10‧‧‧With a thin sheet of cut sheet

1‧‧‧ cutting piece

11‧‧‧Substrate

12‧‧‧Adhesive layer

3‧‧‧ followed by thin slices

4‧‧‧Semiconductor wafer

5‧‧‧Semiconductor wafer

501‧‧‧ pads

502‧‧‧ wafer main body

41‧‧‧Crystal wafer

6‧‧‧Adhesive

601‧‧‧ Terminals

602‧‧‧ Main body

61‧‧‧ Attached with semiconductor wafers

7‧‧‧welding line

8‧‧‧ Sealing resin

Fig. 1 is a schematic cross-sectional view of a sheet.

Fig. 2 is a schematic cross-sectional view of a succeeding sheet with a dicing sheet.

Fig. 3 is a schematic cross-sectional view showing a succeeding sheet with a dicing sheet according to a modification.

FIG. 4 is a schematic cross-sectional view showing a state in which a semiconductor wafer is placed on a subsequent sheet having a dicing sheet.

FIG. 5 is a schematic cross-sectional view showing a state in which a semiconductor wafer is singulated.

Fig. 6 is a schematic cross-sectional view showing a adherend with a semiconductor wafer.

FIG. 7 is a schematic cross-sectional view of a semiconductor device.

Fig. 8 is a DSC curve of Example 2.

[Formation for carrying out the invention]

The present invention will be described in detail below with reference to the embodiments, but the present invention is not limited to the embodiments.

[Embodiment 1] (following sheet 3)

As shown in Fig. 1, the form of the sheet 3 is then in the form of a sheet. The sheet 3 is then thermoset.

The sheet 3 is further provided with the following properties. That is, in the DSC curve measured by DSC under the conditions of raising the temperature from 25 ° C to 175 ° C for 3 minutes and then maintaining 175 ° C for 3 hours, the time from reaching 175 ° C until the reaction peak disappeared was less than 30 minutes. . Since the time from the arrival of 175 ° C to the disappearance of the reaction peak is less than 30 minutes, it can be cured in a short time. In addition, it can be completely or substantially completely cured under standard wire bonding conditions, thereby reducing the vibration of the semiconductor wafer. The time from the arrival of 175 ° C to the disappearance of the reaction peak is preferably less than 25 minutes. On the other hand, the lower limit of the time from the arrival of 175 ° C to the disappearance of the reaction peak is, for example, 5 minutes, 10 minutes, 15 minutes, or the like.

The phrase "the disappearance of the reaction peak" means that the difference in the input of the thermal energy per unit time applied to both of the sample for measurement and the temperature of the reference sample is constant.

The time from the arrival of 175 ° C to the disappearance of the reaction peak can be controlled by the type of the curing accelerator, the content of the curing accelerator, the type of the resin, and the like.

The sheet 3 is then preferably further provided with the following properties. In other words, the heat of reaction obtained by DSC measurement under the condition of raising the temperature at 10 ° C per minute in the range of 25 ° C to 300 ° C is preferably 80 mJ / mg or more. More preferably, it is 85 mJ/mg or more. On the other hand, the heat of reaction is preferably 300 mJ/mg or less, more preferably 200 mJ/mg or less.

The "reaction heat" is a value calculated by dividing the amount of heat measured by DSC measurement under the conditions of temperature increase of 10 ° C per minute in the range of 25 ° C to 300 ° C by the weight of the test piece.

The tensile modulus at 200 ° C obtained by measuring the viscoelasticity of the cured product obtained by curing the succeeding sheet 3 at 10 Hz is 100 MPa or more, preferably 200 MPa or more. Since it is 100 MPa or more, the vibration of the semiconductor wafer can be reduced, and the bonding failure between the copper wire and the pad and the crack of the semiconductor wafer can be reduced. The tensile modulus at 200 ° C is preferably 1000 MPa or less, more preferably 700 MPa or less. As the upper limit of the tensile modulus of elasticity at 200 ° C, for example, 500 MPa, 400 MPa, or the like can be exemplified.

Further, the cured product was obtained by heating the subsequent sheet 3 at 175 ° C for 30 minutes to cure it.

The tensile modulus at 200 ° C of the cured product can be controlled by the hydroxyl equivalent of the phenol resin, the content of the ceria filler, the particle size of the ceria filler, and the like. For example, by using a phenol resin having a small hydroxyl equivalent, increasing the content of the cerium oxide filler, and using a cerium oxide filler having a small particle diameter, the tensile modulus of elasticity at 200 ° C can be improved.

The Tg of the cured product is preferably 150 ° C or higher, more preferably 180 ° C or higher. When it is 150 ° C or more, it is easy to set the tensile modulus of elongation of 200 ° C of the cured product to 100 MPa or more. On the other hand, the Tg of the cured product is preferably 250 ° C or lower, more preferably 220 ° C or lower.

The Tg ("glass transition temperature") of the cured product can be controlled by the hydroxyl equivalent of the phenol resin or the like.

The sheet 3 then contains a resin component. Examples of the resin component include an acrylic resin, an epoxy resin, and a phenol resin.

The acrylic resin is not particularly limited, and one or more esters of acrylic acid or methacrylic acid having a linear or branched alkyl group having a carbon number of 30 or less, particularly a carbon number of 4 to 18, may be mentioned. A polymer of a component (acrylic acid copolymer) or the like. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a n-butyl group, a t-butyl group, an isobutyl group, a pentyl group, an isopentyl group, a hexyl group, a heptyl group, a cyclohexyl group, and 2 -ethylhexyl, octyl, isooctyl, decyl, isodecyl, decyl, isodecyl, undecyl, lauryl, tridecyl, tetradecyl, stearyl, octadecyl Alkyl, or dodecyl, and the like.

Further, the other monomer forming the polymer (acrylic acid copolymer) is not particularly limited, and examples thereof include acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, and rich. Various acid anhydride monomers such as a carboxyl group-containing monomer such as horse acid or crotonic acid, maleic anhydride or itaconic anhydride, 2-hydroxyethyl (meth)acrylate, and 2-hydroxypropyl (meth)acrylate , 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, (meth)acrylic acid Various hydroxyl group-containing monomers such as 12-hydroxylauryl ester or (4-hydroxymethylcyclohexyl)methyl acrylate, styrenesulfonic acid, allylsulfonic acid, 2-(methyl)propenylamine-2- Methylpropanesulfonic acid, (meth) acrylamide Various kinds of sulfonic acid group-containing monomers such as sulfonic acid, sulfopropyl (meth) acrylate or (meth) propylene phthaloxy naphthalene sulfonic acid, or 2-hydroxyethyl acryl decyl phosphate, etc. Monomer.

Among the acrylic resins, an acrylic resin having a weight average molecular weight of 100,000 or more, more preferably an acrylic resin of 300,000 to 3,000,000, more preferably an acrylic resin of 500,000 to 2,000,000 is preferable. This is because if it is within this numerical range, it is excellent in adhesion and heat resistance. Further, the weight average molecular weight is a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene.

The acrylic resin preferably contains a functional group capable of reacting with an epoxy group. Thereby, the acrylic resin and the epoxy resin can be crosslinked.

Examples of the functional group reactive with the epoxy group include a carboxyl group and a hydroxyl group. Among them, a carboxyl group is preferred because of its high reactivity with an epoxy group.

The acid value of the acrylic resin is preferably 5 mgKOH/g or more, more preferably 10 mgKOH/g or more. On the other hand, the acid value of the acrylic resin is preferably 40 mgKOH/g or less, more preferably 25 mgKOH/g or less.

Further, the acid value can be measured by the neutralization titration method specified in JIS K 0070-1992.

The content of the acrylic resin in 100% by weight of the resin component is preferably 14% by weight or less, more preferably 12% by weight or less, still more preferably 11% by weight or less. If it is 14% by weight or less, the tensile modulus of elasticity at 200 ° C can be increased. The content of the acrylic resin in 100% by weight of the resin component is preferably 5% by weight or more, and more preferably 7% by weight or more.

The epoxy resin is not particularly limited, and for example, bisphenol A type, bisphenol F type, bisphenol S type, brominated bisphenol A type, hydrogenated bisphenol A type, bisphenol AF type, biphenyl type, naphthalene can be used. a difunctional epoxy resin or a polyfunctional epoxy resin such as a hydrazine type, a phenol type, a phenol novolac type, an o-cresol novolac type, a trishydroxyphenylmethane type, a tetrahydroxyphenylethane type, or a beta-urea urea type, An epoxy resin such as a triglycidyl isocyanurate type or a glycidylamine type. Among these epoxy resins, a phenolic epoxy resin, a biphenyl type epoxy resin, a trishydroxyphenylmethane type resin or a tetrahydroxyphenylethane type epoxy resin is particularly preferred. Therefore, these epoxy resins are excellent in reactivity with a phenol resin as a curing agent, and are excellent in heat resistance and the like.

The epoxy equivalent of the epoxy resin is preferably 120 g/eq. or more, more preferably 140 g/eq. or more, still more preferably 150 g/eq. or more. On the other hand, the epoxy equivalent of the epoxy resin is preferably 250 g/eq. or less, more preferably 200 g/eq. or less.

Further, the epoxy equivalent of the epoxy resin can be measured by the method specified in JIS K 7236-2009.

The phenol resin is a substance which functions as a curing agent for an epoxy resin, and examples thereof include a phenol type such as a phenol novolac resin, a phenol aralkyl resin, a cresol novolac resin, a t-butyl phenol novolak resin, and a nonylphenol phenol resin. A phenolic resin, a resol type phenol resin, a polyoxystyrene such as polyparaphenylene or the like. Among these phenol resins, a phenol phenol resin and a phenol aralkyl resin are particularly preferable. This is because the connection reliability of the semiconductor device can be improved.

The hydroxyl equivalent of the phenol resin is preferably 120 g/eq. or less, more Good is 110g/eq. below. If it is 120 g/eq. or less, the crosslinking density can be increased, and the tensile modulus of elasticity at 200 ° C can be improved. On the other hand, the hydroxyl equivalent of the phenol resin is preferably 80 g/eq. or more, more preferably 90 g/eq. or more.

The blending ratio of the epoxy resin to the phenol resin is, for example, suitably blended so that the hydroxyl group in the phenol resin is 0.5 to 2.0 equivalents per 1 equivalent of the epoxy group in the epoxy resin component. More suitable for 0.8~1.2 equivalents. That is, if the blending ratio of the two is out of the range, a sufficient curing reaction cannot be performed, and the properties of the cured product are likely to deteriorate.

The total content of the epoxy resin and the phenol resin in 100% by weight of the resin component is preferably 86% by weight or more, more preferably 88% by weight or more, still more preferably 89% by weight or more. If it is 86% by weight or more, the tensile modulus of elasticity at 200 ° C can be increased. On the other hand, the total content of the epoxy resin and the phenol resin is preferably 95% by weight or less, and more preferably 93% by weight or less.

Next, the sheet 3 preferably contains a cerium oxide filler having a BET specific surface area of 4 m ² /g or more.

The BET specific surface area of the cerium oxide filler is preferably 15 m ² /g or more. On the other hand, the BET specific surface area of the cerium oxide filler is preferably 100 m ² /g or less, more preferably 50 m ² /g or less.

The BET specific surface area was measured by a BET adsorption method (multipoint method). Specifically, the succeeding sheet 3 was ashed by heating at 700 ° C for 2 hours in an air atmosphere. After the obtained ash was vacuum degassed at 110 ° C for 6 hours or more, a 4-connected specific surface area ‧ pore diameter made of Quantachrome was used. The distribution measuring device "NOVA-4200e type" was measured under nitrogen at a temperature of 77.35 K.

The new Mohs hardness of the ceria filler is preferably 4 or more. If it is 4 or more, the tensile modulus of elasticity at 200 ° C can be efficiently improved. The upper limit of the new Mohs hardness of the cerium oxide filler is not particularly limited, but is, for example, 10.

The content of the cerium oxide filler in the sheet 3 is preferably 50% by weight or more, more preferably 51% by weight or more. If it is 50% by weight or more, the tensile modulus of elasticity at 200 ° C can be increased. On the other hand, the content of the cerium oxide filler is preferably 70% by weight or less, more preferably 65% by weight or less.

The sheet 3 then preferably comprises a curing accelerator. The content of the curing accelerator is preferably 0.1 to 5 parts by weight, more preferably 0.1 to 3 parts by weight, per 100 parts by weight of the resin component. If it is 0.1 part by weight or more, it can be cured in a short time.

The curing accelerator is not particularly limited, and examples thereof include an imidazole compound, a triphenylphosphine compound, an amine compound, a triphenylborane compound, and a trihaloborane compound.

Examples of the imidazole-based compound include 2-methylimidazole (trade name: 2MZ), 2-undecylimidazole (trade name: C11Z), 2-heptadecylimidazole (trade name: C17Z), and 1, 2-Dimethylimidazole (trade name: 1.2DMZ), 2-ethyl-4-methylimidazole (trade name: 2E4MZ), 2-phenylimidazole (trade name: 2PZ), 2-phenyl-4- Methylimidazole (trade name: 2P4MZ), 1-benzyl-2-methylimidazole (trade name: 1B2MZ), 1-benzyl-2-phenylimidazole (trade name: 1B2PZ), 1-cyanoethyl-2-methylimidazole (trade name: 2MZ-CN), 1-cyanoethyl-2- Undecylimidazole (trade name: C11Z-CN), 1-cyanoethyl-2-phenylimidazolium trimellitate (trade name: 2PZCNS-PW), 2,4-diamino-6 -[2'-methylimidazolyl-(1,)]-ethyl-s-triazine (trade name: 2MZ-A), 2,4-diamino-6-[2'-undecylimidazolyl -(1')]-ethyl s-triazine (trade name: C11Z-A), 2,4-diamino-6-[2'-ethyl-4'-methylimidazolyl-(1') ]-ethyl s-triazine (trade name: 2E4MZ-A), 2,4-diamino-6-[2'-methylimidazolyl-(1')]-ethyl s-triazine isocyanuric acid Adduct (trade name: 2MA-OK), 2-phenyl-4,5-dihydroxymethylimidazole (trade name: 2PHZ-PW), 2-phenyl-4-methyl-5-hydroxymethyl Imidazole (trade name: 2P4MHZ-PW), etc. (all manufactured by Shikoku Chemicals Co., Ltd.).

The triphenylphosphine-based compound is not particularly limited, and examples thereof include triphenylphosphine, tributylphosphine, tris(p-methylphenyl)phosphine, tris(nonylphenyl)phosphine, and diphenyltolyl. Triorganophosphine such as phosphine, tetraphenylphosphonium bromide (trade name: TPP-PB), methyltriphenylphosphonium (trade name: TPP-MB), methyltriphenylphosphonium chloride (trade name: TPP-MC), methoxymethyltriphenylphosphonium (trade name: TPP-MOC), benzyltriphenylphosphonium chloride (trade name: TPP-ZC), etc. (all manufactured by Beixing Chemical Co., Ltd.).

The triphenylborane-based compound is not particularly limited, and examples thereof include tris(p-methylphenyl)phosphine. Further, as the triphenylborane-based compound, a compound having a triphenylphosphine structure is further included. Things. The compound having a triphenylphosphine structure and a triphenylborane structure is not particularly limited, and examples thereof include tetraphenylphosphonium tetraphenylborate (trade name: TPP-K) and tetraphenylphosphonium tetra-pair. Triborate (trade name: TPP-MK), benzyltriphenylphosphonium tetraphenylborate (trade name: TPP-ZK), triphenylphosphine triphenylborane (trade name: TPP-S), etc. (All are manufactured by Beixing Chemical Co., Ltd.).

The amine-based compound is not particularly limited, and examples thereof include monoethanolamine trifluoroborate (manufactured by Stella-Chemifa Co., Ltd.) and dicyandiamide (manufactured by Nacalai Tesque Co., Ltd.).

The trihalogenated borane-based compound is not particularly limited, and examples thereof include trichloroborane and the like.

The sheet 3 may be appropriately contained in addition to the above-mentioned components, and a blending agent commonly used in film production, such as a crosslinking agent or the like, may be appropriately contained.

The sheet 3 can then be produced by a usual method. For example, a solution of an adhesive composition containing each of the above components can be prepared, and a solution of the adhesive composition can be applied onto a substrate separator so as to have a predetermined thickness to form a coating film, and then the coating film can be dried. The subsequent sheet 3 is produced.

The solvent to be used in the solution of the adhesive composition is not particularly limited, and an organic solvent in which the above components are uniformly dissolved, kneaded or dispersed can be preferably used. For example, a ketone solvent such as dimethylformamide, dimethylacetamide, N-methylpyrrolidone, acetone, methyl ethyl ketone or cyclohexanone, toluene or xylene may be mentioned. The coating method is not particularly limited. Examples of the method of solvent coating include die coating, gravure coating, and roll coating. Reverse coating, comma coating, tube coating, screen printing, and the like. Among them, die coating is preferred from the viewpoint of high uniformity of coating thickness.

As the substrate separator, surface coating can be carried out using polyethylene terephthalate (PET), polyethylene, polypropylene, or a release agent such as a fluorine-based release agent or a long-chain alkyl acrylate release agent. Plastic film or paper of cloth. Examples of the coating method of the adhesive composition solution include roll coating, screen coating, gravure coating, and the like. Further, the drying conditions of the coating film are not particularly limited, and for example, it can be carried out at a drying temperature of 70 to 160 ° C for a drying time of 1 to 5 minutes.

As a method of producing the succeeding sheet 3, for example, a method in which the above-described respective components are mixed by a mixer, and the obtained mixture is press-molded to produce the succeeding sheet 3 is also suitable. As a mixer, a planetary stirrer etc. are mentioned.

The thickness of the sheet 3 is not particularly limited, and is preferably 5 μm or more, and more preferably 15 μm or more. If it is less than 5 μm, there may be a case where a warped semiconductor wafer or a portion which does not follow the semiconductor wafer is generated, and the subsequent area may become unstable. Further, the thickness of the sheet 3 is preferably 100 μm or less, more preferably 50 μm or less. If it is larger than 100 μm, the subsequent sheet 3 is excessively protruded due to the load of the wafer bonding, and there is a case where the pad is contaminated.

The sheet 3 is then used in the manufacture of a semiconductor device. Specifically, it is used as a film for adhering an adherend such as a lead frame to a semiconductor wafer (hereinafter referred to as a "wafer mounting film"). Examples of the adherend include a lead frame, an interposer, and a semiconductor wafer.

The sheet 3 is then preferably used in the form of a sheet with a dicing sheet attached thereto.

(with the sheet 10 of the cut sheet)

The following sheet 10 with the dicing sheet attached will be described.

As shown in FIG. 2, the succeeding sheet 10 with the dicing sheet is provided with the dicing sheet 1 and the contiguous sheet 3 disposed on the dicing sheet 1. The dicing sheet 1 includes a base material 11 and an adhesive layer 12 disposed on the base material 11. The sheet 3 is then placed on the adhesive layer 12.

As shown in FIG. 3, the succeeding sheet 10 to which the dicing sheet is attached may be a structure in which the subsequent sheet 3 is formed only on the attached portion of the workpiece (semiconductor wafer 4 or the like).

The base material 11 is a strength matrix which is a back sheet 10 to which a dicing sheet is attached, and is preferably a material having ultraviolet ray permeability. Examples of the substrate 11 include low density polyethylene, linear polyethylene, medium density polyethylene, high density polyethylene, ultra low density polyethylene, random copolymer polypropylene, block copolymer polypropylene, and homopolymerization. Polyolefins such as propylene, polybutene, polymethylpentene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-(meth)acrylic acid copolymer, ethylene-(meth)acrylate (random) , alternating) copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, polyurethane, polyethylene terephthalate, polyethylene naphthalate, polyester, polycarbonate, poly Yttrium, polyetheretherketone, polyimine, polyetherimide, polyamine, wholly aromatic polyamine, polyphenylene sulfide, aramid (paper), glass, fiberglass cloth, fluororesin , polyvinyl chloride, poly A vinylidene chloride, a cellulose resin, an anthrone resin, a metal (foil), paper, or the like.

The surface of the substrate 11 can be subjected to conventional surface treatment such as chromic acid treatment, ozone exposure, flame exposure, high-voltage shock exposure, ionizing radiation treatment, etc., in order to improve adhesion to adjacent layers, retention, and the like. Chemical or physical treatment, coating treatment by a primer (for example, a binder described later).

The thickness of the substrate 11 is not particularly limited and may be appropriately determined, but is generally about 5 to 200 μm.

The adhesive used for the formation of the adhesive layer 12 is not particularly limited, and for example, a general pressure-sensitive adhesive such as an acrylic adhesive or a rubber-based adhesive can be used. As a pressure-sensitive adhesive, it is preferable to use an acrylic polymer as a base polymer from the viewpoints of cleaning and cleaning properties of an organic solvent such as ultrapure water or alcohol, such as a semiconductor wafer or glass. Acrylic adhesive.

As the acrylic polymer, for example, an alkyl (meth)acrylate (for example, methyl ester, ethyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, sec-butyl ester, tert-butyl ester, or amyl ester) may be mentioned. , isoamyl ester, hexyl ester, heptyl ester, octyl ester, 2-ethylhexyl ester, isooctyl ester, decyl ester, decyl ester, isodecyl ester, undecyl ester, dodecyl ester, tridecane The alkyl group of the ester, the tetradecyl ester, the hexadecyl ester, the octadecyl ester, the eicosyl ester or the like has a carbon number of 1 to 30, particularly a linear chain having a carbon number of 4 to 18. Acrylic polymerization using one or more of a cycloalkyl (meth)acrylate (for example, a cyclopentyl ester or a cyclohexyl ester) as a monomer component. Compounds, etc. Further, the term "(meth)acrylate" means acrylate and/or methacrylate, and the so-called (meth) of the present invention means the same.

The acrylic polymer may contain a unit corresponding to another monomer component copolymerizable with the alkyl (meth)acrylate or the cycloalkyl ester, as needed, for the purpose of modification such as cohesive force and heat resistance. Examples of such a monomer component include acrylic acid, methacrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and the like. A carboxyl group-containing monomer: an anhydride monomer such as maleic anhydride or itaconic anhydride: 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate Ester, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, (methyl) a hydroxyl group-containing monomer such as (4-hydroxymethylcyclohexyl)methyl acrylate: styrenesulfonic acid, allylsulfonic acid, 2-(methyl)acrylamido-2-methylpropanesulfonic acid, a sulfonic acid group-containing monomer such as methyl acrylamide propyl sulfonic acid, (meth) sultone, or (meth) propylene phthaloxy naphthalene sulfonic acid: 2-hydroxyethyl propylene decyl phosphate A monomer containing a phosphate group, such as acrylamide or acrylonitrile. These monomer components which can be copolymerized may be used alone or in combination of two or more. The amount of such copolymerizable monomers used is preferably 40% by weight or less based on the total of the monomer components.

Further, in order to crosslink the acrylic polymer, a polyfunctional monomer or the like may be contained as a monomer component for copolymerization as needed. As Examples of such a polyfunctional monomer include hexanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, and new Pentandiol di(meth)acrylate, pentaerythritol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate Ester, epoxy (meth) acrylate, polyester (meth) acrylate, urethane (meth) acrylate, and the like. These polyfunctional monomers may be used alone or in combination of two or more. The amount of the polyfunctional monomer to be used is preferably 30% by weight or less based on the total of the monomer components from the viewpoint of adhesion characteristics and the like.

The acrylic polymer can be obtained by polymerizing a single monomer or a mixture of two or more kinds of monomers. The polymerization can be carried out by any method such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization or the like. From the viewpoint of preventing contamination of the cleaned adherend, etc., an acrylic polymer having a small content of a low molecular weight substance is preferred. From this point of view, the number average molecular weight of the acrylic polymer is preferably 300,000 or more, more preferably about 400,000 to 3,000,000.

Further, in the above-mentioned adhesive, in order to increase the number average molecular weight of the acrylic polymer or the like as the base polymer, an external crosslinking agent may be suitably used. As a specific method of the external crosslinking method, a method of adding a crosslinking agent such as a polyisocyanate compound, an epoxy compound, an aziridine compound, or a melamine crosslinking agent, and reacting them may be mentioned. In the case of using an external crosslinking agent, the amount used may be based on the equilibrium with the base polymer to be crosslinked, and further, based on adhesion The use of the agent is appropriately determined. In general, it is preferably blended in an amount of about 5 parts by weight or less, more preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the base polymer. Further, in the adhesive, if necessary, additives such as various conventionally known tackifiers and anti-aging agents may be used in addition to the above components.

The adhesive layer 12 can be formed using a radiation curable adhesive. The radiation-curable adhesive can be irradiated with radiation such as ultraviolet rays to increase the degree of crosslinking and to easily reduce the adhesion.

By irradiating only the portion 12a of the adhesive layer 12 corresponding to the workpiece attachment portion shown in Fig. 2 with radiation, the difference in adhesion to the other portion 12b can be set. In this case, the portion 12b formed of the uncured radiation-curable adhesive adheres to the succeeding sheet 3, and the holding force at the time of cutting can be ensured.

Further, by curing the radiation-curable adhesive layer 12 corresponding to the succeeding sheet 3 shown in Fig. 3, the portion 12a in which the adhesive force is remarkably lowered can be formed. In this case, the wafer ring can be fixed to the aforementioned portion 12b formed of an uncured radiation-curable adhesive.

In other words, in the case where the adhesive layer 12 is formed by the radiation-curable adhesive, it is preferable to irradiate the portion 12a with the adhesion of the portion 12a in the adhesive layer 12 to the adhesion of the other portion 12b. .

The radiation-curable adhesive can be used without any particular limitation, and a radiation-curable functional group having a carbon-carbon double bond or the like can be used and displayed. Adhesive adhesive. As a radiation-curable adhesive, for example, an additive type in which a radiation-curable monomer component or an oligomer component is blended in a general pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive or a rubber-based pressure-sensitive adhesive can be exemplified. Radiation-curing adhesive.

Examples of the radiation-curable monomer component to be blended include a urethane oligomer, a urethane (meth) acrylate, and a trimethylolpropane tri(meth) acrylate. , tetramethylol methane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol monohydroxy penta (meth) acrylate, dipentaerythritol hexa (methyl) ) acrylate, 1,4-butanediol di(meth)acrylate, and the like. In addition, examples of the radiation curable oligomer component include various oligomers such as a urethane type, a polyether type, a polyester type, a polycarbonate type, and a polybutadiene type, and the molecular weight thereof is preferably 100~. The range is around 30,000. The blending amount of the radiation-curable monomer component or the oligomer component can be appropriately determined according to the type of the pressure-sensitive adhesive layer to reduce the adhesion of the pressure-sensitive adhesive layer. In general, it is, for example, 5 to 500 parts by weight, preferably about 40 to 150 parts by weight, per 100 parts by weight of the base polymer of the acrylic polymer or the like constituting the pressure-sensitive adhesive.

In addition, as the radiation-curable adhesive, in addition to the above-described additive-type radiation-curable adhesive, carbon-carbon having a carbon-carbon in a polymer side chain or a main chain or a main chain end may be used as a base polymer. An intrinsic type of radiation-curable adhesive of a double bond polymer. The intrinsic radiation-curable adhesive does not need to contain an oligomer component or the like as a low molecular component, or is not contained in a large amount, and thus the oligomer component or the like is not It is preferred to move in the adhesive over time to form a stable layer structure of the adhesive layer.

The aforementioned base polymer having a carbon-carbon double bond can be a polymer having a carbon-carbon double bond and having adhesiveness without particular limitation. As such a base polymer, a polymer having an acrylic polymer as a basic skeleton is preferred. The basic skeleton of the acrylic polymer may, for example, be an acrylic polymer exemplified above.

The introduction method of the carbon-carbon double bond to the acrylic polymer is not particularly limited, and various methods can be employed. However, introduction of a carbon-carbon double bond into the polymer side chain facilitates molecular design. For example, a method in which a monomer having a functional group in an acrylic polymer is copolymerized, and a compound having a functional group capable of reacting with the functional group and a carbon-carbon double bond is maintained in the radiation curing property of the carbon-carbon double bond is maintained. A method of performing a condensation or addition reaction at the same time.

Examples of the combination of such functional groups include a carboxylic acid group and an epoxy group, a carboxylic acid group and an aziridine group, a hydroxyl group and an isocyanate group. Among these combinations of functional groups, a combination of a hydroxyl group and an isocyanate group is suitable from the viewpoint of easiness of reaction tracking. Further, by using a combination of these functional groups, if a combination of the above-mentioned acrylic polymer having a carbon-carbon double bond is produced, the functional group may be on either side of the acrylic polymer and the above compound, but it is preferred. In the combination, the acrylic polymer has a hydroxyl group, and the compound has an isocyanate group. In this case, examples of the isocyanate compound having a carbon-carbon double bond include methacryl oxime isocyanate and 2-methyl propylene methoxyethyl isocyanate. Ester, m-isopropenyl-α,α-dimethylbenzyl isocyanate, and the like. Further, as the acrylic polymer, a hydroxyl group-containing monomer exemplified above, an ether compound of 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether or diethylene glycol monovinyl ether, or the like is used. Copolymerized polymer.

The above-mentioned intrinsic radiation-curable adhesive may be a base polymer (particularly an acrylic polymer) having a carbon-carbon double bond as described above, but may be blended with the above-mentioned radiation curable to such an extent that the properties are not deteriorated. Monomer component or oligomer component. The radiation curable oligomer component or the like is usually in the range of 30 parts by weight, preferably 0 to 10 parts by weight, per 100 parts by weight of the base polymer.

In the radiation-curable pressure-sensitive adhesive, a photopolymerization initiator is contained when it is cured by ultraviolet rays or the like. Examples of the photopolymerization initiator include 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl) ketone and α-hydroxy-α,α'-dimethylacetophenone. α-Ethyl alcohol compound such as 2-methyl-2-hydroxypropiophenone or 1-hydroxycyclohexyl phenyl ketone: methoxyacetophenone, 2,2-dimethoxy-2-phenylbenzene Ethyl ketone, 2,2-diethoxyacetophenone, 2-methyl-1-[4-(methylthio)-phenyl]-2-morpholinopropan-1-acetophenone-based compound: A benzoin ether compound such as benzoin ethyl ether, benzoin isopropyl ether or fennel dimethyl ether: a ketal compound such as benzoin dimethyl ketal: an aromatic compound such as 2-naphthalenesulfonium chloride a sulfonium chloride compound: a photoactive lanthanide compound such as 1-benzophenone-1,1-propanedione-2-(o-ethoxycarbonyl)anthracene: benzophenone, benzamidine benzoic acid, 3, a benzophenone compound such as 3'-dimethyl-4-methoxybenzophenone: thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethyl Thiophenone, isopropyl thioxanthone, 2,4-di Thioxanone compounds such as chlorothioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone, etc.: camphorquinone: halogenated ketone: mercaptophosphine oxide: mercaptophosphine Acid esters, etc. The blending amount of the photopolymerization initiator is, for example, about 0.05 to 20 parts by weight based on 100 parts by weight of the base polymer such as the acrylic polymer constituting the pressure-sensitive adhesive.

In addition, examples of the radiation-curable adhesive include an addition polymerizable compound having two or more unsaturated bonds and an alkoxy group having an epoxy group, which are disclosed in JP-A-60-196956. A photopolymerizable compound such as decane, a rubber-based adhesive such as a photopolymerization initiator such as a carbonyl compound, an organic sulfur compound, a peroxide, an amine or a phosphonium salt compound, or an acrylic adhesive.

In the radiation-curable adhesive layer 12, a compound colored by radiation irradiation may be contained as needed. By including the compound colored by the radiation irradiation in the adhesive layer 12, it is possible to color only the portion irradiated with the radiation. The compound which is colored by radiation irradiation is a colorless or pale color before radiation irradiation, and becomes a colored compound by radiation irradiation, and examples thereof include a leuco dye. The ratio of use of the compound colored by radiation irradiation can be appropriately set.

The thickness of the adhesive layer 12 is not particularly limited, but is preferably about 1 to 50 μm from the viewpoint of preventing the chipping of the wafer cut surface or the fixing of the sheet 3. It is preferably 2 to 30 μm, more preferably 5 to 25 μm.

The backing sheet 10 with the dicing sheet is preferably protected by a diaphragm (not shown). That is, it is preferable to arrange a separator on the subsequent sheet 3. The separator has a function as a protective material for protecting the succeeding sheet 3 before being used for actual use. The separator is peeled off when the workpiece is attached to the succeeding sheet 3. As the separator, polyethylene terephthalate (PET), polyethylene, polypropylene, or a release agent such as a fluorine-based release agent or a long-chain alkyl acrylate release agent may be used for surface coating. Plastic film or paper.

The succeeding sheet 10 to which the cut sheet is attached can be manufactured by a usual method. For example, by bonding the adhesive layer 12 of the dicing sheet 1 to the subsequent sheet 3, the succeeding sheet 10 with the dicing sheet can be manufactured.

At a peeling temperature of 25 ° C and a peeling speed of 300 mm/min, the peeling force when the sheet 3 is peeled off from the dicing sheet 1 is preferably 0.1 N/10 mm or more. If it is less than 0.1 N/10 mm, it is possible to cause the wafer to fly out. On the other hand, the peeling force is preferably 0.2 N/10 mm or less. If it is larger than 0.2 N/10 mm, there is a tendency that picking becomes difficult.

(Method of Manufacturing Semiconductor Device)

As shown in FIG. 4, the semiconductor wafer 4 is crimped onto the subsequent sheet 10 to which the dicing sheet is attached. Examples of the semiconductor wafer 4 include a tantalum wafer, a tantalum carbide wafer, and a compound semiconductor wafer. As the compound semiconductor wafer, a gallium nitride wafer or the like can be given.

As the pressure bonding method, for example, a method of pressing by a pressing mechanism such as a pressure roller or the like can be given.

The crimping temperature (attachment temperature) is preferably 35 ° C or higher, more preferably 37 ° C or higher. The lower limit of the crimping temperature is preferably as low as possible, and is preferably 50 ° C or lower, more preferably 45 ° C or lower. By the pressure bonding at a low temperature, the thermal influence on the semiconductor wafer 4 can be prevented, and the warpage of the semiconductor wafer 4 can be suppressed. Further, the pressure is preferably from 1 × 10 ⁵ Pa to 1 × 10 ⁷ Pa, more preferably from 2 × 10 ⁵ Pa to 8 × 10 ⁶ Pa.

As shown in FIG. 5, the die wafer 41 is formed by cutting the semiconductor wafer 4. The die bond wafer 41 includes a semiconductor wafer 5 and an adhesive film 31 disposed on the semiconductor wafer 5. The semiconductor wafer 5 includes a wafer main body portion 502 and a pad 501 disposed on the wafer main body portion 502. The pad 501 is an electrode pad. As a material of the pad 501, aluminum etc. are mentioned. In this step, a cutting method called a full cut that cuts into the succeeding sheet 10 with the cut sheet may be employed. The cutting device is not particularly limited, and a conventionally known device can be used. Further, since the semiconductor wafer 4 is subsequently fixed by the succeeding sheet 10 with the dicing sheet attached, it is possible to suppress wafer notch or wafer scattering, and it is also possible to suppress breakage of the semiconductor wafer 4.

The wafer 41 for the die bonding is picked up. The method of picking up is not particularly limited, and various conventionally known methods can be employed. For example, a method in which each of the semiconductor wafers 5 is lifted from the side of the succeeding sheet 10 with the dicing sheet, and then the wafer 41 is picked up by the pick-up device.

When the adhesive layer 12 is of an ultraviolet curing type, the adhesive layer 12 is irradiated with ultraviolet rays and then picked up. Thereby, since the adhesive force of the adhesive layer 12 to the die-bonding wafer 41 is lowered, the die-bonding wafer 41 can be easily picked up. Irradiation intensity when irradiated with ultraviolet light, when irradiated The conditions such as the interval are not particularly limited, and may be appropriately set as needed.

As shown in FIG. 6, the adherend 61 with the semiconductor wafer is obtained by crimping the die-bonding wafer 41 against the adherend 6. The adherend 61 with the semiconductor wafer is provided with the adherend 6 , the adhesive film 31 disposed on the adherend 6 , and the semiconductor wafer 5 disposed on the adhesive film 31 . The adherend 6 includes a main body portion 602 and a terminal portion 601 disposed on the main body portion 602.

The temperature at which the die bond wafer 41 is pressure-bonded to the adherend 6 (hereinafter referred to as "wafer mounting temperature") is preferably 80 ° C or higher, more preferably 90 ° C or higher. Further, the wafer mounting temperature is preferably 150 ° C or lower, more preferably 130 ° C or lower.

The adhesive film 31 is cured by heating the adherend 61 with the semiconductor wafer under pressure. Thereby, the semiconductor wafer 5 is fixed to the adherend 6. By curing the adhesive film 31 under pressure, the void existing between the adhesive film 31 and the adherend 6 can be eliminated, and the area in which the film 31 is in contact with the adherend 6 can be secured.

As a method of heating under pressure, for example, a method of heating the adherend 61 with a semiconductor wafer placed in a chamber filled with an inert gas may be mentioned. The pressure of the pressurized atmosphere is preferably 0.5 kg/cm ² (4.9 × 10 ^-2 MPa) or more, more preferably 1 kg/cm ² (9.8 × 10 ^-2 MPa) or more, further preferably 5 kg/cm ² (4.9). ×10 ^-1 MPa) or more. If it is 0.5 kg/cm ² or more, the void existing between the adhesive film 31 and the adherend 6 can be easily eliminated. Pressure of the pressurized atmosphere is preferably 20kg / cm ² (1.96MPa) or less, more preferably 18kg / cm ² (1.77MPa) or less, more preferably 15kg / cm ² (1.47MPa) or less. If it is 20 kg/cm ² or less, the protrusion of the adhesive film 31 caused by excessive pressurization can be suppressed.

The heating temperature is preferably 80 ° C or higher, more preferably 120 ° C or higher, further preferably 150 ° C or higher, and particularly preferably 170 ° C or higher. When it is 80 ° C or more, the adhesive film 31 can be set to an appropriate hardness, and the voids can be effectively eliminated by pressurization and aging. The heating temperature is preferably 260 ° C or lower, more preferably 200 ° C or lower, more preferably 180 ° C or lower. If it is 260 ° C or less, decomposition of the adhesive film 31 can be prevented.

The heating time is preferably 0.1 hour or longer, more preferably 0.2 hour or longer. The heating time is preferably 24 hours or shorter, more preferably 3 hours or shorter, further preferably 1 hour or shorter, and particularly preferably 30 minutes or shorter.

As shown in FIG. 7, a wire bonding step of electrically connecting the pad 501 and the terminal portion 601 with the bonding wires 7 is performed. As a material of the bonding wire 7, copper etc. are mentioned.

The wire bonding step includes a step of joining one end of the bonding wire 7 to the pad 501, a step of bonding the other end of the bonding wire 7 to the terminal portion 601, and the like.

For the step of bonding one end of the bonding wire 7 to the pad 501, specifically, the bonding wire 7 is applied by applying ultrasonic waves to the bonding wire 7 while crimping one end of the bonding wire 7 onto the pad 501. The step of bonding the pads 501.

Bonding is preferably carried out at 175 ° C or higher, more preferably at 200 ° C or higher. On the other hand, it is preferably at least 300 ° C, more preferably below 260 ° C. Line bonding.

For the step of joining the other end of the bonding wire 7 to the terminal portion 601, specifically, the bonding wire is applied to the bonding wire 7 while the other end of the bonding wire 7 is crimped onto the terminal portion 601. 7 is a step of joining the terminal portion 601.

After the wire bonding step, a sealing step of sealing the semiconductor wafer 5 with the sealing resin 8 is performed. This step is performed to protect the semiconductor wafer 5 and the bonding wires 7 mounted on the adherend 6. This step is carried out by molding a resin for sealing with a mold. As the sealing resin 8, for example, an epoxy resin is used. The heating temperature at the time of resin sealing is preferably 165 ° C or higher, more preferably 170 ° C or higher, and the heating temperature is preferably 185 ° C or lower, more preferably 180 ° C or lower.

Heating may also be carried out after sealing as needed (post-cure step). Thereby, the sealing resin 8 which is insufficiently cured in the sealing step can be completely cured. The heating temperature can be set as appropriate.

As described above, the semiconductor device can be manufactured by a method including the steps of preparing the succeeding sheet 10 with the dicing sheet attached thereto, and the step of crimping the semiconductor wafer 4 on the succeeding sheet 3 by dicing Next, a step of forming the semiconductor wafer 5 including the pad 501 and the die-bonding wafer 41 of the bonding film 31 disposed on the semiconductor wafer 5 on the semiconductor wafer 4 on the sheet 3, and the step of including the terminal portion 601 The step of forming the wafer-attached adherend 61 by crimping the die-bonding wafer 41 onto the adherend 6 and the step of curing the adhesive film 31 by heating the adherend 61 with the wafer, and the bonding film 31 curing steps after the advance The row includes a step of bonding one end of the bonding wire 7 including copper to the pad 501 and a step of bonding the other end of the bonding wire 7 to the terminal portion 601.

[Examples]

Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the following examples as long as the invention is not exceeded.

The components used in the examples will be described.

Acrylic rubber: Teisan Resin SG-708-6 manufactured by Nagase ChemteX Co., Ltd. (acrylate copolymer containing carboxyl group and hydroxyl group, Mw: 700,000, acid value: 9 mgKOH/g, glass transition temperature: 4 ° C)

Epoxy Resin 1: EPPN-501HY (epoxy equivalent 169g/eq. epoxy resin) manufactured by Nippon Kayaku Co., Ltd.

Epoxy Resin 2: EOCN-1020 (epoxy equivalent 198 g/eq. epoxy resin) manufactured by Nippon Kayaku Co., Ltd.

Epoxy Resin 3: jER828 (epoxy equivalent: 190 g/eq. epoxy resin) manufactured by Mitsubishi Chemical Corporation

Phenolic Resin 1: MEH-7851S (phenolic resin having a hydroxyl equivalent of 209 g/eq.) manufactured by Minghe Chemical Co., Ltd.

Phenolic Resin 2: P-180 (phenolic resin having a hydroxyl equivalent of 105 g/eq.) manufactured by Arakawa Chemical Co., Ltd.

Ceria filler: SO-25R manufactured by Admatechs Co., Ltd. (spherical cerium oxide having a BET specific surface area of 6.5 m ² /g and a new Mohs hardness of 7)

Catalyst: TPP-MK manufactured by Beixing Chemical Industry Co., Ltd. (tetraphenylphosphonium tetra-p-tolyl borate)

[Following of the sheet and the subsequent sheet with the cut sheet]

The components and the solvent (methyl ethyl ketone) described in Table 1 were placed in a stirred tank of a hybrid mixer (HM-500 manufactured by Kyence) in accordance with the blending ratios shown in Table 1, and stirred and mixed in a stirring mode for 3 minutes. The obtained varnish was applied onto a release-treated film (MRA50, manufactured by Mitsubishi Plastics Co., Ltd.) by a die coater, and then dried to obtain a subsequent sheet having a thickness of 20 μm. A circular backing sheet having a diameter of 230 mm was cut out from the succeeding sheet, and a circular succeeding sheet was attached to an adhesive layer of a dicing sheet (P2130G manufactured by Nitto Denko Corporation) at 25 ° C to prepare a cut sheet. The next sheet of the sheet.

[assessment]

The following evaluation was performed on the obtained succeeding sheet and the succeeding sheet with the cut sheet. The results are shown in Table 1.

(Measurement of elastic modulus and Tg)

The laminated sheet was bonded at 60 ° C to obtain a laminated sheet having a thickness of 400 μm. The processed product was obtained by processing the laminated sheet into a size of 10 mm × 30 mm × 400 μm. The processed product was cured by heating at 175 ° C for 30 minutes. After curing, the viscoelasticity of the processed product was measured using a dynamic viscoelasticity measuring apparatus (RSA III manufactured by TA Instruments). The measurement conditions are in the temperature range of -10 ° C to 285 ° C, the temperature increase rate is 10 ° C / min, The chuck spacing was 22.5 mm at 10 Hz. According to the obtained elastic coefficient data, the elastic coefficient of 200 ° C was read. Further, the temperature of the peak of the obtained tan δ was defined as Tg.

(Measurement of reaction heat)

10 mg of the test piece was cut out from the subsequent sheet. The test piece was sandwiched with an aluminum pan to prepare a measurement sample. A reference sample containing only an aluminum pan was also prepared. The measurement was carried out using a differential scanning calorimeter (DSC6220 manufactured by Seiko Instruments Co., Ltd.) at a temperature elevation rate of 10 ° C/min and a temperature range of 25 ° C to 300 ° C. The heat of reaction was calculated by dividing the heat of the obtained exothermic reaction peak by the weight of the sample.

(Measurement of peak disappearance time)

10 mg of the test piece was cut out from the subsequent sheet. The test piece was sandwiched with an aluminum pan to prepare a sample for measurement. A reference sample containing only an aluminum pan was also prepared. DSC measurement was carried out under the conditions of raising the temperature from 25 ° C to 175 ° C for 3 minutes and then maintaining 175 ° C for 3 hours using a differential scanning calorimeter (DSC 6220 manufactured by Seiko Instruments Co., Ltd.). The time from the arrival of 175 ° C to the disappearance of the reaction peak was read from the DSC curve. In addition, "the disappearance of the reaction peak" means that the difference in the input of the thermal energy per unit time applied to both of the sample for measurement and the temperature of the reference sample is constant. The DSC curve of Example 2 is shown in Fig. 8.

(wire solderability)

A wafer on which aluminum vapor deposition was performed on one side was ground to obtain a wafer for dicing having a thickness of 100 μm. The dicing wafer was attached to the subsequent sheet with the dicing sheet, and then cut into 2 mm squares, thereby obtaining a wafer with the subsequent sheet. The wafer with the succeeding sheet was placed on the Cu lead frame at 120 ° C, 0.1 MPa, and 1 sec. The subsequent sheet was cured by heating at 175 ° C for 30 minutes. Five wire metal wires having a wire diameter of 20 μm were welded on one wafer using a wire bonding apparatus (Maxum Plus manufactured by K & S). The Cu metal wire was attached to the Cu lead frame under the conditions of output 80 Amp, time 10 ms, and load 50 g. The Cu metal wire was attached to the wafer at 200 ° C, output of 125 Amp, time of 10 ms, and load of 80 g. The case where one of the five Cu metal wires could not be soldered to the wafer was judged as ×, and the case where five of the five Cu metal wires could be soldered to the wafer was judged as ○.

3‧‧‧ followed by thin slices

Claims (9)

A follow-up sheet used in the manufacture of a semiconductor device, which was measured by DSC under conditions of a temperature increase from 25 ° C to 175 ° C for 3 minutes and then 175 ° C for 3 hours, from reaching 175 ° C to The time at which the reaction peak disappeared was less than 30 minutes, and the viscoelasticity of the cured product obtained by curing at 175 ° C for 30 minutes was measured at 10 Hz, and the obtained tensile modulus at 200 ° C was 100 MPa or more. In the subsequent sheet of the claim 1, the heat of reaction obtained by DSC measurement under the condition of raising the temperature at 10 ° C per minute in the range of 25 ° C to 300 ° C is 80 mJ / mg or more. The subsequent sheet of claim 1 wherein the cured product obtained by curing at 175 ° C for 30 minutes has a Tg of 150 ° C or higher. The succeeding sheet of claim 1, which comprises a cerium oxide filler having a BET specific surface area of 4 m ² /g or more, and the content of the cerium oxide filler is 50% by weight or more. A subsequent sheet of claim 1 comprising a phenolic resin having a hydroxyl equivalent weight of 120 g/eq. or less. An adhesive sheet according to claim 1, which comprises a resin component, and the resin component comprises an epoxy resin, a phenol resin, and an acrylic resin. The content of the acrylic resin in 100% by weight of the resin component is 14% by weight or less. The subsequent sheet of claim 6, wherein the phenolic resin has a hydroxyl equivalent of 120 g/eq. or less. A succeeding sheet with a dicing sheet, comprising: a dicing sheet comprising a substrate, an adhesive layer disposed on the substrate, and a subsequent sheet of the claim 1 disposed on the adhesive layer. A method of manufacturing a semiconductor device, comprising: preparing a step of attaching a dicing sheet with a dicing sheet, a step of crimping a semiconductor wafer with the splicing sheet, and splicing the semiconductor disposed on the splicing sheet a step of forming a semiconductor wafer having a pad and a die-bonding wafer disposed on the semiconductor wafer, and a wafer bonded to the die-bonding body by a bonding body having a terminal portion a step of adhering the wafer, a step of curing the adhesive film by heating the bonded body attached to the wafer, and a step of curing the adhesive film to include one end of a metal wire containing copper a step of bonding to the pad and a step of bonding the other end of the wire to the terminal.