WO2022209875A1 - 半導体用接着剤、半導体用接着剤シート、及び半導体装置の製造方法 - Google Patents
半導体用接着剤、半導体用接着剤シート、及び半導体装置の製造方法 Download PDFInfo
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- WO2022209875A1 WO2022209875A1 PCT/JP2022/011736 JP2022011736W WO2022209875A1 WO 2022209875 A1 WO2022209875 A1 WO 2022209875A1 JP 2022011736 W JP2022011736 W JP 2022011736W WO 2022209875 A1 WO2022209875 A1 WO 2022209875A1
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- adhesive
- semiconductor
- electrically connected
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- adhesive layer
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- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 description 1
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- 125000001827 mesitylenyl group Chemical group [H]C1=C(C(*)=C(C([H])=C1C([H])([H])[H])C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 229940057867 methyl lactate Drugs 0.000 description 1
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- 150000002894 organic compounds Chemical class 0.000 description 1
- AFEQENGXSMURHA-UHFFFAOYSA-N oxiran-2-ylmethanamine Chemical compound NCC1CO1 AFEQENGXSMURHA-UHFFFAOYSA-N 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
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- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- USFPINLPPFWTJW-UHFFFAOYSA-N tetraphenylphosphonium Chemical compound C1=CC=CC=C1[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 USFPINLPPFWTJW-UHFFFAOYSA-N 0.000 description 1
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- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
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- SRPWOOOHEPICQU-UHFFFAOYSA-N trimellitic anhydride Chemical compound OC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 SRPWOOOHEPICQU-UHFFFAOYSA-N 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/60—Attaching or detaching leads or other conductive members, to be used for carrying current to or from the device in operation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/731—Location prior to the connecting process
- H01L2224/73101—Location prior to the connecting process on the same surface
- H01L2224/73103—Bump and layer connectors
- H01L2224/73104—Bump and layer connectors the bump connector being embedded into the layer connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73201—Location after the connecting process on the same surface
- H01L2224/73203—Bump and layer connectors
- H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
- H01L2224/8119—Arrangement of the bump connectors prior to mounting
- H01L2224/81191—Arrangement of the bump connectors prior to mounting wherein the bump connectors are disposed only on the semiconductor or solid-state body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
- H01L2224/8119—Arrangement of the bump connectors prior to mounting
- H01L2224/81193—Arrangement of the bump connectors prior to mounting wherein the bump connectors are disposed on both the semiconductor or solid-state body and another item or body to be connected to the semiconductor or solid-state body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/8319—Arrangement of the layer connectors prior to mounting
- H01L2224/83191—Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed only on the semiconductor or solid-state body
Definitions
- the present disclosure relates to a semiconductor adhesive, a semiconductor adhesive sheet, and a method for manufacturing a semiconductor device.
- a flip-chip connection method is sometimes adopted in which a semiconductor chip having bumps as connection portions is directly connected to the connection portions (electrodes) of a wiring circuit board via the bumps.
- an adhesive is used to form an underfill that fills the gap between the semiconductor chip and the printed circuit board and seals the connection portion.
- the main object of the present disclosure is to provide a semiconductor adhesive that can suppress warping of a semiconductor chip while having good fluidity during mounting.
- One aspect of the present disclosure is a semiconductor device in which a plurality of connection portions of a semiconductor chip and a plurality of connection portions of a printed circuit board are electrically connected to each other, or a plurality of connection portions of a plurality of semiconductor chips are electrically connected to each other.
- the present invention relates to a semiconductor adhesive used for sealing at least a part of connection portions electrically connected to each other in a electrically connected semiconductor device.
- the semiconductor adhesive contains an epoxy resin, a curing agent, a thermoplastic resin, and an inorganic filler.
- the inorganic filler includes an inorganic filler having an average particle size of 100-400 nm.
- the semiconductor adhesive contains an epoxy resin, a curing agent, a thermoplastic resin, and an inorganic filler.
- the inorganic filler exhibits at least one maximum value at a particle size of 100 to 400 nm in the obtained particle size distribution when the particle size distribution of the inorganic filler is measured by a dynamic light scattering method.
- the content of the inorganic filler may be 20-60% by mass based on the total amount of the semiconductor adhesive.
- the inorganic filler may be at least one selected from the group consisting of silica, alumina, and silicon nitride.
- the thermoplastic resin may have a weight average molecular weight of 20,000 to 200,000.
- the curing agent may be an imidazole-based curing agent.
- the semiconductor adhesive may further contain an organic acid.
- the semiconductor adhesive sheet includes a supporting substrate and an adhesive layer provided on the supporting substrate and containing the semiconductor adhesive.
- the supporting substrate may have a plastic film and an adhesive layer provided on the plastic film. In this case, the adhesive layer is provided on the adhesive layer.
- the semiconductor device manufacturing method includes heating and heating the semiconductor chip, the wiring circuit board, and the adhesive while interposing the adhesive between the semiconductor chip having the plurality of connection parts and the wiring circuit board having the plurality of connection parts.
- the connection portion of the semiconductor chip and the connection portion of the printed circuit board are electrically connected to each other by applying pressure, and at least a part of the connection portions that are electrically connected to each other are sealed with the cured adhesive.
- a step of forming a bonded body connecting portions of a plurality of semiconductor chips by heating and pressurizing the semiconductor chips and the adhesive while interposing an adhesive between the plurality of semiconductor chips having a plurality of connection portions; are electrically connected to each other, and at least some of the electrically connected connections are sealed with a cured adhesive;
- the connection portions of the semiconductor chip and the connection portions of the semiconductor wafer are bonded to each other.
- the adhesive is the semiconductor adhesive described above.
- a method of manufacturing a semiconductor device includes steps of preparing a wafer body having two main surfaces and a semiconductor wafer having a plurality of connection portions provided on one of the main surfaces of the wafer body; A step of providing an adhesive layer containing an adhesive on the main surface, a step of thinning the wafer body by grinding the main surface of the wafer body opposite to the connecting portion, the thinned wafer body and bonding A step of forming a semiconductor chip with an adhesive and a semiconductor chip having an adhesive layer by dicing the adhesive layer may be further included.
- a semiconductor adhesive is provided that is capable of suppressing warping of a semiconductor chip while maintaining good fluidity during mounting.
- Some forms of adhesives for semiconductors are also excellent in visible light transmittance, so that alignment is easy and sensor recognition is excellent.
- a semiconductor adhesive sheet and a method for manufacturing a semiconductor device using the semiconductor adhesive are provided.
- FIG. 1 is a schematic cross-sectional view showing one embodiment of an adhesive sheet.
- FIG. 2 is a schematic cross-sectional view showing another embodiment of the adhesive sheet.
- FIG. 3 is a schematic cross-sectional view showing an embodiment of a method for manufacturing a semiconductor device.
- FIG. 4 is a schematic cross-sectional view showing an embodiment of a method for manufacturing a semiconductor device.
- 5A and 5B are schematic cross-sectional views showing an embodiment of a method for manufacturing a semiconductor device, and FIGS. 5A and 5B are schematic cross-sectional views showing respective steps.
- FIG. 6 is a schematic cross-sectional view showing an embodiment of a method for manufacturing a semiconductor device.
- FIG. 7 is a schematic cross-sectional view showing an embodiment of a method for manufacturing a semiconductor device.
- 8A, 8B, 8C, 8D, and 8A are schematic cross-sectional views showing another embodiment of the method for manufacturing a semiconductor device.
- e) is a schematic cross-sectional view showing
- a numerical range indicated using "-" indicates a range that includes the numerical values before and after "-" as the minimum and maximum values, respectively.
- the upper limit value or lower limit value of the numerical range at one step may be replaced with the upper limit value or lower limit value of the numerical range at another step.
- the upper and lower limits of the numerical ranges may be replaced with the values shown in the examples.
- the upper limit value and the lower limit value described individually can be combined arbitrarily.
- "(meth)acrylate” means at least one of acrylate and methacrylate corresponding thereto.
- FIG. 1 is a schematic cross-sectional view showing one embodiment of the adhesive sheet.
- the adhesive sheet 10 shown in FIG. 1 is a semiconductor adhesive sheet comprising a supporting substrate 3, an adhesive layer 2 provided on the supporting substrate 3, and a protective film 1 covering the adhesive layer 2. be.
- the adhesive layer 2 is a layer formed with a thermosetting adhesive.
- the adhesive that forms the adhesive layer 2 includes an epoxy resin (hereinafter sometimes referred to as "(A) component”), a curing agent (hereinafter sometimes referred to as “(B) component”), and heat. It is an adhesive for semiconductors containing a plastic resin (hereinafter sometimes referred to as “component (C)”) and an inorganic filler (hereinafter sometimes referred to as “component (D)”).
- component (C) plastic resin
- component (D) inorganic filler
- Component (A) Epoxy resin
- the component (A) is not particularly limited as long as it cures and has an adhesive action.
- the epoxy resins described can be widely used.
- Examples of component (A) include bifunctional epoxy resins such as bisphenol A type epoxy, phenol novolac type epoxy resins, novolac type epoxy resins such as cresol novolac type epoxy resins, and trisphenolmethane type epoxy resins.
- Generally known resins such as polyfunctional epoxy resins, glycidylamine type epoxy resins, heterocycle-containing epoxy resins, and alicyclic epoxy resins can be used as component (A).
- component (A) has a thermal weight loss rate of 5% or less at 250°C when the temperature at the time of connection is 250°C. It is preferable to use an epoxy resin which is When the temperature at the time of connection is 300°C, it is preferable to use an epoxy resin having a thermal weight loss rate of 5% or less at 300°C.
- the content of component (A) is 100 parts by mass in total of component (A) and component (C) to be described later, from the viewpoint of maintaining the heat resistance and adhesiveness of the adhesive after curing and expressing high reliability. 40 to 95 parts by weight, 50 to 90 parts by weight, 60 to 85 parts by weight, or 70 to 80 parts by weight. When the content of component (A) is 40 parts by mass or more, higher connection reliability tends to be obtained. When the content of component (A) is 95 parts by mass or less, the adhesive layer tends to easily retain its shape.
- component (B) Component: Curing Agent
- component (B) include imidazole curing agents, phenolic resin curing agents, acid anhydride curing agents, amine curing agents, and phosphine curing agents.
- the (B) component may be an imidazole curing agent.
- the content of component (B) may be 0.1 to 40 parts by mass with respect to 100 parts by mass of component (A). When the content of component (A) is 0.1 part by mass or more, a sufficient curing reaction rate tends to be obtained. When the content of component (A) is 40 parts by mass or less, good heat resistance and adhesiveness tend to be maintained.
- the content of the curing agent may be 1 to 30 parts by weight, 3 to 20 parts by weight, or 5 to 10 parts by weight per 100 parts by weight of component (A).
- imidazole curing agents examples include 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-undecylimidazole.
- the imidazole-based curing agent is a 2,4-diamino-6-[2'-methylimidazolyl-(1')]-ethyl-s-triazineisocyanurate adduct from the viewpoint of excellent curability. you can
- the content of the imidazole curing agent may be the same as the content of component (B) above.
- phenol resin-based curing agents examples include phenol novolak resins, cresol novolak resins, phenol aralkyl resins, cresol naphthol formaldehyde polycondensates, and various polyfunctional phenol resins such as triphenylmethane type polyfunctional phenol resins.
- the equivalent ratio of the phenolic resin curing agent to the component (A) is 0.3 to 1.5, 0.4 to 1. .0, or 0.5 to 1.0.
- Acid anhydride-based curing agents include, for example, methylcyclohexanetetracarboxylic dianhydride, trimellitic anhydride, pyromellitic anhydride, benzophenonetetracarboxylic dianhydride, and ethylene glycol bisanhydrotrimellitate.
- the equivalent ratio of the acid anhydride curing agent to the component (A) is 0.3 to 1.5,0 .4 to 1.0, or 0.5 to 1.0.
- amine-based curing agents examples include dicyandiamide.
- the equivalent ratio of the amine-based curing agent to component (A) is 0.3 to 1.5, 0.4 to 1.0. , or from 0.5 to 1.0.
- phosphine-based curing agents examples include triphenylphosphine, tetraphenylphosphonium tetraphenylborate, tetraphenylphosphonium tetra(4-methylphenyl)borate, and tetraphenylphosphonium(4-fluorophenyl)borate.
- the content of the phosphine-based curing agent may be 0.1 to 10 parts by weight or 0.1 to 5 parts by weight per 100 parts by weight of component (A).
- Component (C) Thermoplastic resin
- component (C) include polyester resins, polyether resins, polyamide resins, polyamideimide resins, polyimide resins, polyvinyl butyral resins, polyvinyl formal resins, phenoxy resins, and polyhydroxy polyether resins. , acrylic resins, polystyrene resins, butadiene resins, acrylonitrile-butadiene copolymers, acrylonitrile-butadiene-styrene resins, styrene-butadiene copolymers, and acrylic acid copolymers.
- the film formability of the adhesive can be improved.
- Film formability means mechanical properties such that when a film-like adhesive layer is formed from an adhesive, the adhesive layer does not easily tear, crack, or become sticky. If it is easy to handle as a film under normal conditions (for example, normal temperature (25° C.)), it can be said that the film formability is good.
- the component (C) may contain a polyimide resin or a phenoxy resin because they are excellent in heat resistance and mechanical strength.
- the weight average molecular weight of component (C) may be 10,000 to 800,000, 15,000 to 500,000, or 20,000 to 200,000.
- the weight-average molecular weight is in such a range, it becomes easy to achieve both strength and flexibility of the sheet-like or film-like adhesive layer 2, and the flowability of the adhesive layer 2 is good. Therefore, the circuit filling property (embedding property) of the wiring can be sufficiently secured.
- the weight average molecular weight means a value measured by gel permeation chromatography and converted using a standard polystyrene calibration curve.
- the glass transition temperature of the component (C) may be 20 to 170°C or 25 to 120°C from the viewpoint of imparting adhesive properties to the adhesive layer before curing while maintaining film formability.
- the glass transition temperature of the component (C) is 20°C or higher, the film formability at room temperature (25°C) can be maintained, and the adhesive layer 2 deforms during processing of the semiconductor wafer in the backgrinding step. tends to be difficult.
- the glass transition temperature of the component (C) is 170° C. or lower, the effect of improving the connection reliability by the adhesive after being subjected to heat history tends to be exhibited more remarkably.
- the content of component (C) is 5 to 60 parts by mass, 10 to 50 parts by mass, 15 to 40 parts by mass, or 20 to 30 parts by mass with respect to 100 parts by mass of the total amount of components (A) and (C). It may be parts by mass.
- the content of component (C) is within this range, the film-forming properties of the adhesive can be improved, fluidity can be exhibited during thermocompression bonding, and resin exclusion between bumps and circuit electrodes can be improved. tend to be able.
- (D) Component Inorganic Filler
- the (D) component include glass, silica, alumina, titanium oxide, carbon black, mica, and boron nitride.
- at least one selected from the group consisting of silica, alumina, titanium oxide, and boron nitride may be used, and at least one selected from the group consisting of silica, alumina, and silicon nitride may be used.
- the (D) component may be surface-treated with a surface treatment agent from the viewpoint of compatibility and adhesive strength between its surface and organic solvents and other components.
- surface treatment agents include silane coupling agents.
- the functional group of the silane coupling agent include vinyl group, (meth)acryloyl group, epoxy group, mercapto group, amino group, diamino group, alkoxy group and ethoxy group.
- Component (D) satisfies either condition (a) or condition (b) below, and preferably satisfies both condition (a) and condition (b).
- the average particle size of component (D1) is 100 to 400 nm, and may be, for example, 130 to 350 nm or 150 to 300 nm.
- the average particle diameter of the component (D1) is 100 nm or more, the specific surface area of the particles does not become too large, the viscosity (fluidity) can be maintained at an appropriate level, the embeddability into the projecting electrodes is improved, and voids are formed. Residue also tends to be less likely to occur.
- the average particle diameter of component (D1) is 400 nm or less, it tends to be possible to prevent a decrease in visible light transmittance due to scattering of visible light.
- the average particle diameter means the average particle diameter obtained by the dynamic light scattering method.
- the content of component (D1) based on the total amount of component (D), may be 50% by mass or more, 55% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass, It may be at least 90% by mass, at least 95% by mass, or at least 100% by mass.
- component (D) may contain an inorganic filler having an average particle size of less than 100 nm (hereinafter sometimes referred to as “component (D2)”) in addition to component (D1). Often, an inorganic filler having an average particle diameter exceeding 400 nm (hereinafter sometimes referred to as “(D3) component”) may be included.
- the (D) component may contain, for example, the (D3) component.
- the average particle size of component (D3) may be, for example, 1000 nm or less, 800 nm or less, or 600 nm or less.
- the total content of component (D2) and component (D3) is, based on the total amount of component (D), 0 to 50% by mass, 0 to 45% by mass, 0 to 40% by mass, 0 to 30% by mass, It may be 0-20% by weight, 0-10% by weight, or 0-5% by weight.
- the particle size distribution of component (D) can be measured by the following method using, for example, a semiconductor adhesive.
- a semiconductor adhesive is prepared, the semiconductor adhesive is mixed with acetone, and the mixture is irradiated with ultrasonic waves to dissolve components other than the component (D) (operation (a)).
- the mixed liquid is centrifuged using a centrifugal separator, and the supernatant is removed (operation (b)).
- Such operation (a) and operation (b) are repeated three times to obtain component (D) as a residue.
- the residual component (D) is re-dispersed in a solvent for measurement, and using this as a measurement sample, the particle size distribution is measured by the dynamic light scattering method.
- the component (D) exhibits at least one maximum value at a particle size of 100 to 400 nm in the resulting particle size distribution. As long as component (D) exhibits at least one maximum value at a particle size of 100 to 400 nm, it may have a maximum value at a particle size of less than 100 nm or at a particle size of more than 400 nm. Component (D) preferably exhibits at least one maximum value only at a particle diameter of 100 to 400 nm.
- the content of component (D) may be 10 to 80% by mass, 15 to 70% by mass, or 20 to 60% by mass based on the total amount of the semiconductor adhesive.
- the content of the component (D) is 10% by mass or more, an increase in the coefficient of linear expansion and a decrease in the elastic modulus of the adhesive layer 2 are prevented, and the connection reliability between the semiconductor chip and the substrate after pressure bonding is easily maintained. There is a tendency.
- the content of the component (D) is 80% by mass or less, the melt viscosity of the adhesive is easily maintained, and the wettability of the interface between the semiconductor chip and the adhesive layer 2 or the interface between the circuit board and the adhesive layer 2 By preventing a decrease in the , it tends to be possible to prevent the occurrence of residual voids due to peeling or insufficient filling.
- the semiconductor adhesive may further contain an organic acid (hereinafter sometimes referred to as "(E) component").
- (E) component functions as a fluxing agent. That is, the component (E) has a melting point lower than the melting point of the solder, and removes oxides on the solder surface and metal surfaces such as circuit electrodes after melting, thereby improving the solder wettability of the adhesive layer. can be improved.
- the (E) component may be an organic acid having a carboxyl group.
- the (E) component is preferably dissolved in the organic solvent used for preparing the resin varnish. Thereafter, in the film forming process, the organic solvent is vaporized by heating, and the dissolved component (E) precipitates again and is uniformly present in the film as fine powder. As a result, the specific surface area of the fluxing agent is increased and the number of contact points with the oxide film is increased, so that the oxide film is easily removed and the solderability is improved.
- the melting point of the component (E) may be 50 to 200° C. from the viewpoint that the fine powder flux agent is melted and liquefied during thermocompression bonding, thereby improving the flux properties.
- the melting point of the component (E) is within this range, higher connection reliability tends to be obtained.
- the melting point of component (E) can be measured using a general melting point measuring device.
- a sample for measuring the melting point is required to be pulverized into a fine powder and to use a small amount to reduce the temperature deviation within the sample.
- a capillary tube closed at one end is often used as a container for a sample, but depending on the measurement device, the container is sandwiched between two microscope cover glasses. Also, if the temperature is rapidly raised, a temperature gradient will occur between the sample and the thermometer, resulting in measurement errors. desirable.
- the content of component (E) may be 0.1 to 20% by mass or 0.5 to 10% by mass based on the total amount of the semiconductor adhesive. When the content of the component (E) is within this range, good solder wettability is likely to be ensured.
- the semiconductor adhesive may further contain an organic filler (hereinafter sometimes referred to as "(F) component").
- an organic filler hereinafter sometimes referred to as "(F) component”
- component (F) component By including the component (F) in the adhesive for semiconductors, it is possible to control the adhesiveness and the like of the adhesive. Since component (F) is generally insoluble in organic solvents, it can be blended into the adhesive while maintaining its particle shape. Therefore, the component (F) can be dispersed like islands in the adhesive layer 2 after curing, and the strength of the connecting body can be kept high. Thereby, the adhesive can be provided with a function as an impact modifier having stress relaxation properties.
- Component (F) includes, for example, acrylic resin, silicone resin, butadiene rubber, polyester, polyurethane, polyvinyl butyral, polyarylate, polymethyl methacrylate, acrylic rubber, polystyrene, NBR, SBR, silicone-modified resin, etc. polymers.
- the component (F) may be an organic filler having a molecular weight of 1,000,000 or more or an organic filler having a three-dimensional crosslinked structure, from the viewpoint of dispersibility in adhesives, stress relaxation properties, and improvement of adhesiveness.
- organic fillers include alkyl (meth)acrylate-butadiene-styrene copolymer; alkyl (meth)acrylate-silicone copolymer; silicone-(meth)acrylic copolymer; etc.
- an organic filler having a molecular weight of 1,000,000 or more or an organic filler having a three-dimensional crosslinked structure means that the solvent has poor solubility due to its ultrahigh molecular weight, or has a three-dimensional network structure.
- Component (F) has a core-shell structure, and an organic filler having different compositions between the core layer and the shell layer can also be used.
- Core-shell type organic fillers include particles obtained by grafting an acrylic resin to a silicone-acrylic rubber core, and particles obtained by grafting an acrylic resin to an acrylic copolymer.
- the average particle size of component (F) may be, for example, 0.1 to 2 ⁇ m. When the average particle diameter is 0.1 ⁇ m or more, the void suppressing effect tends to be easily obtained.
- the content of the component (F) may be 5 to 20% by mass based on the total amount of the adhesive for semiconductors in order to give the adhesive layer a void suppression effect during connection and a stress relaxation effect after connection.
- Various coupling agents can be added to adhesives for semiconductors in order to modify the surface of the filler, improve interfacial bonding between dissimilar materials, and increase adhesive strength.
- the coupling agent include silane-based, titanium-based, and aluminum-based coupling agents.
- the coupling agent may be a silane-based coupling agent because of its high effectiveness.
- Silane-based coupling agents include, for example, ⁇ -methacryloxypropyltrimethoxysilane, ⁇ -methacryloxypropylmethyldimethoxysilane, ⁇ -mercaptopropyltrimethoxysilane, ⁇ -mercaptopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, ethoxysilane, 3-ureidopropyltriethoxysilane, 3-ureidopropyltrimethoxysilane and the like.
- Ion trapping agent can be added to semiconductor adhesives to absorb ionic impurities and improve insulation reliability when moisture is absorbed.
- Ion scavengers include, for example, triazinethiol compounds; compounds known as copper damage inhibitors, such as bisphenol-based reducing agents, to prevent ionization and leaching of copper; zirconium-based compounds; antimony-bismuth-based compounds; Inorganic ion adsorbents such as organic compounds can be mentioned.
- the adhesive layer 2 may be an anisotropic conductive adhesive film (ACF) containing conductive particles, or the adhesive layer 2 may be a non-conductive adhesive film (NCF) containing no conductive particles. There may be.
- ACF anisotropic conductive adhesive film
- NCF non-conductive adhesive film
- the adhesive layer 2 formed from the semiconductor adhesive may have a reaction rate of 60% or more or 70% or more as measured by DSC after being heated at 250°C for 10 seconds. After storing the adhesive sheet for 14 days at room temperature, the reaction rate of the adhesive layer 2 measured by DSC may be less than 10%.
- the visible light transmittance of the adhesive layer 2 formed from the semiconductor adhesive may be 5% or more, 8% or more, or 10% or more. Alignment tends to be difficult when the visible light transmittance is 5% or more. On the other hand, the upper limit of visible light transmittance is not particularly limited.
- the adhesive layer 2 can be formed by dissolving or dispersing a semiconductor adhesive in an organic solvent to form a resin varnish, applying the resin varnish on the protective film 1, and removing the organic solvent by heating. can. After that, the support base material 3 is laminated on the adhesive layer 2 at room temperature (25° C.) to 80° C. to obtain the adhesive sheet 10 of the present embodiment.
- the adhesive layer 2 can also be formed by applying the above resin varnish onto the support substrate 3 and removing the organic solvent by heating.
- organic solvents examples include aromatic hydrocarbons such as toluene, xylene, mesitylene, cumene and p-cymene; aliphatic hydrocarbons such as hexane and heptane; cyclic alkanes such as methylcyclohexane; tetrahydrofuran, 1,4-dioxane and the like.
- cyclic ethers such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone; esters such as methyl acetate, ethyl acetate, butyl acetate, methyl lactate, ethyl lactate, ⁇ -butyrolactone carbonic acid esters such as ethylene carbonate and propylene carbonate; amides such as N,N-dimethylformamide, N,N-dimethylacetamide and N-methyl-2-pyrrolidone;
- the protective film 1 examples include plastic films such as polyethylene terephthalate, polytetrafluoroethylene film, polyethylene film, polypropylene film, and polymethylpentene film. From the viewpoint of releasability, as the protective film 1, a film having a low surface energy made of a fluororesin such as a polytetrafluoroethylene film may be used.
- the surface of the protective film 1 on which the adhesive layer 2 is to be formed is treated with a release agent such as a silicone-based release agent, a fluorine-based release agent, or a long-chain alkyl acrylate-based release agent.
- a release agent such as a silicone-based release agent, a fluorine-based release agent, or a long-chain alkyl acrylate-based release agent.
- a commercially available protective film treated with a release agent for example, Toyobo Film Solution Co., Ltd. "A-63" (release agent: modified silicone) and "A-31" (release agent: Pt silicone-based) are available.
- the thickness of the protective film 1 may be 10-100 ⁇ m, 10-75 ⁇ m, or 25-50 ⁇ m. When the thickness of the protective film 1 is 10 ⁇ m or more, the protective film tends to be difficult to tear during coating, and when the thickness of the protective film 1 is 100 ⁇ m or less, it tends to be inexpensive and easy to obtain.
- Examples of the method for applying the resin varnish onto the protective film 1 (or the support substrate 3) include known methods such as knife coating, roll coating, spray coating, gravure coating, bar coating, and curtain coating. is mentioned.
- the thickness of the adhesive layer 2 is not particularly limited, but may be 5-200 ⁇ m, 7-150 ⁇ m, or 10-100 ⁇ m. When the thickness of the adhesive layer 2 is 5 ⁇ m or more, it tends to be easy to secure a sufficient adhesive strength and to easily fill the convex electrodes of the circuit board. When the thickness of the adhesive layer 2 is 200 ⁇ m or less, it is economically advantageous and tends to meet the demand for miniaturization of semiconductor devices.
- the supporting substrate 3 examples include plastic films such as polyethylene terephthalate film, polytetrafluoroethylene film, polyethylene film, polypropylene film, polymethylpentene film, polyvinyl acetate film, polyvinyl chloride film, and polyimide film.
- the support base material 3 may be a mixture of two or more selected from the above materials, or a multi-layered film of the above films.
- the thickness of the support base material 3 may be, for example, 5 to 250 ⁇ m. When the thickness of the supporting base material 3 is 5 ⁇ m or more, there is a tendency that the supporting base material can be prevented from being damaged during grinding (back grinding) of the semiconductor wafer. When the thickness of the support base material 3 is 250 ⁇ m or less, it tends to be economically advantageous.
- the minimum light transmittance of the supporting substrate 3 in the wavelength range of 500 to 800 nm may be 10% or more.
- the support base material 3 one having an adhesive layer laminated on the plastic film can be used.
- FIG. 2 is a schematic cross-sectional view showing another embodiment of the adhesive sheet.
- the adhesive sheet 11 shown in FIG. 2 is provided on the support substrate 3 having the plastic film 3b and the adhesive layer 3a provided on the plastic film 3b, and the adhesive layer 3a, and the semiconductor of the present embodiment is provided on the adhesive layer 3a. and a protective film 1 covering the adhesive layer 2 .
- the surface of the plastic film 3b is subjected to chemical or physical treatment such as chromic acid treatment, ozone exposure, flame exposure, high voltage shock exposure, and ionizing radiation treatment. may be applied.
- the adhesive layer 3a is adhesive at room temperature (25°C) and may have the necessary adhesion to the adherend.
- the pressure-sensitive adhesive layer 3a may have a property of being cured by high-energy rays such as radiation or heat (that is, the adhesive strength is reduced).
- the adhesive layer 3a can be formed using, for example, an acrylic resin, various synthetic rubbers, natural rubbers, or polyimide resins.
- the thickness of the adhesive layer 3a may be, for example, 5-20 ⁇ m.
- the adhesive sheets 10 and 11 are a semiconductor device in which a plurality of connection portions of a semiconductor chip and a plurality of connection portions of a wiring circuit board are electrically connected to each other, or a plurality of connection portions of a plurality of semiconductor chips are connected to each other. In an electrically connected semiconductor device, it can be used to seal at least a part of the connecting portions electrically connected to each other.
- the adhesive sheets 10 and 11 can also be used as adhesives in lamination techniques using through silicon vias.
- FIGS. 3-7 are schematic cross-sectional views showing an embodiment of the method for manufacturing a semiconductor device.
- the method shown in FIGS. 3-7 includes the steps of preparing a semiconductor wafer 30 having a wafer body A having two major surfaces and a plurality of connections 20 provided on one of the major surfaces of the wafer body A; The step of providing an adhesive layer 2 containing an adhesive on the main surface of the wafer main body A on the connecting portion 20 side, and grinding the main surface of the wafer main body A on the side opposite to the connecting portion 20, thereby removing the wafer main body A.
- the connection portion 20 of the semiconductor chip 30' and the connection portion 22 of the wiring circuit board 40 are electrically connected to each other, and the connection in which they are electrically connected to each other is established. and forming a joined body 50 in which the parts 20 and 22 are sealed by the cured adhesive layer 2a.
- the adhesive layer 2 on the support base material 3 is adhered to the main surface of the wafer main body A on which the connecting part 20 is provided, and the structure is such that the support base material 3/adhesive layer 2/semiconductor wafer is formed. 30 is laminated to obtain a laminate.
- Some or all of the plurality of connection portions 20 provided on the wafer body A may be solder bumps for solder bonding.
- Some or all of the connection portions 22 of the printed circuit board 40 may be solder bumps.
- the applying device may include a heating mechanism and a pressure mechanism, and may further include a vacuum suction mechanism.
- the adhesive layer 2 may be attached to the semiconductor wafer 30 using a roll-shaped or sheet-shaped adhesive sheet 10 that has been processed to match the outer shape of the semiconductor wafer 30 .
- the temperature for application may be 40-80°C, 50-80°C, or 60-80°C.
- the surface of the wafer main body A opposite to the side on which the connecting portion 20 is provided is ground by a grinder 4 to thin the wafer main body A.
- the thickness of the thinned wafer body A may be, for example, 10-300 ⁇ m or 20-100 ⁇ m.
- the grinding of the wafer body A can be performed using a general back grind (B/G) device.
- B/G back grind
- the adhesive layer 2 may be evenly attached to the semiconductor wafer 30 without inclusion of voids.
- the dicing tape 5 is attached to the semiconductor wafer 30 of the laminate, placed in a predetermined device, and the supporting base material 3 is peeled off.
- the support base material 3 has an adhesive layer 3a like the adhesive sheet 11 shown in FIG.
- the radiation used here includes, for example, ultraviolet rays, electron beams, infrared rays, and the like. Thereby, the support base material 3 can be easily peeled off.
- the wafer body A and the adhesive layer 2 of the semiconductor wafer 30 are diced by a dicing saw 6 as shown in FIG. 5(b).
- the wafer body A is divided into a plurality of chip bodies A' and the adhesive layer 2 is divided into a plurality of portions on the chip bodies A'.
- individualized semiconductor chips 30 ′ each having a chip body A′ and a plurality of connection portions 20 are formed.
- the semiconductor chips 30' and the adhesive are pushed up from the dicing tape 5 side with a needle while separating the semiconductor chips 30' from each other.
- the adhesive-attached semiconductor chip 35 composed of the layer 2 is sucked by the suction collet 7 and picked up.
- the adhesive-attached semiconductor chips 35 may be packed in a tray and collected, or may be directly mounted on the wiring circuit board 40 by a flip chip bonder.
- the work of attaching the dicing tape 5 to the ground wafer main body A can be performed in the same process as fixing to the dicing frame using a general wafer mounter.
- a commercially available dicing tape can be applied as the dicing tape 5, and it may be a UV-curing type or a pressure-sensitive type.
- the connecting portion 20 of the semiconductor chip 30' and the connecting portion 22 of the wiring circuit board 40 are aligned, and the adhesive-attached semiconductor chip 35 and the wiring circuit board 40 are thermocompression bonded.
- a bonded body 50 composed of the wiring circuit board 40, the semiconductor chip 30' and the cured adhesive layer 2a is formed.
- the wired circuit board 40 has a substrate 8 and a plurality of connection portions 22 provided on the substrate 8 .
- the connecting portion 20 and the connecting portion 22 are electrically and mechanically connected by soldering or the like.
- a hardened adhesive layer 2 a is formed between the semiconductor chip 30 ′ and the printed circuit board 40 .
- the step of forming the joined body 50 includes forming a temporary pressure-bonded body by thermocompression bonding the adhesive-attached semiconductor chip 35 and the wiring circuit board 40 at a temperature lower than the melting point of the connecting portions 20 and 22; forming the bonded body 50 by heating and pressing the crimped body to a temperature at which at least one of the connecting portions 20 or 22 melts.
- the temperature during thermocompression may be 200°C or higher or 220 to 260°C from the viewpoint of solder joint.
- the thermocompression bonding time may be 1 to 20 seconds.
- the thermocompression pressure may be 0.1 to 5 MPa.
- the connecting portions 20 and 22 can be aligned by referring to the alignment marks formed on the circuit surface of the chip body A'.
- the wiring circuit board 40, the semiconductor chip 30' mounted on the wiring circuit board 40, and the adhesive layer 2a interposed therebetween and sealing the connecting portions 20 and 22 are provided.
- a semiconductor device including the bonded body 50 is obtained.
- FIG. 8 is a schematic cross-sectional view showing another embodiment of the method for manufacturing a semiconductor device.
- the manufacturing method of the semiconductor device shown in FIG. the semiconductor chip 30', the semiconductor wafer 30, and the adhesive layer 2 are heated to electrically connect the connection portion 20 of the semiconductor chip 30' and the connection portion 23 of the semiconductor wafer A to each other. and a step of forming a joined body 50 in which the connected portions 22 and 23 are sealed with an adhesive layer 2a made of a cured adhesive. More specifically, the steps of forming the bonded body 50 include placing the semiconductor wafer 30 on the stage 60 as shown in FIG.
- an adhesive layer 2 and a semiconductor chip 30' and forming a temporary pressure-bonded body 55 which is a laminated body composed of the adhesive layer 2 and the semiconductor chip 30'; forming a joined body 50 in which the connecting portion 20 and the connecting portion 23 are electrically connected as shown in FIG. further heating and pressing the bonded body 50 in a pressure oven 90 as shown in FIG. 8(e).
- connection portion 20 of the semiconductor chip 30' has pillars or bumps 20a provided on the chip body A' and solder 20b provided on the pillars or bumps 20a.
- the semiconductor wafer 30 includes a wafer body A, wirings 15 provided on the wafer body A, connection portions 24 provided on the wirings 15, and a passivation film 16 provided on the wafer body A and covering the wirings 15.
- the temporary pressure-bonded body 55 is formed by thermo-compression bonding the semiconductor chip 35 with adhesive to the semiconductor wafer 30 with the pressure bonding tool 70 on the heated stage 60 .
- the heating temperature of the stage 60 is a temperature lower than the melting point of the connecting portion 20 (particularly the solder 20b) and the melting point of the connecting portion 23, and may be 60 to 150°C or 70 to 100°C, for example.
- the temperature of the crimping tool 70 may be, for example, 80-350°C or 100-170°C.
- the thermocompression bonding time for forming the temporary compression body 55 may be, for example, 5 seconds or less, 3 seconds or less, or 2 seconds or less.
- the bonded body 50 is heated to at least one of the melting point of the connecting portion 20 (especially the solder 20b) and the melting point of the connecting portion 23 using the crimping tool 80. It is formed by pressing while
- the temperature of the crimping tool 80 may be, for example, 180°C or higher, 220°C or higher, or 250°C or higher, and may be 350°C or lower, 320°C or lower, or 300°C or lower.
- the heating temperature of the stage 60 during thermocompression to form the bonded body 50 may be 60-150°C or 70-100°C.
- the duration of thermocompression with the crimping tool 80 to form the joint 50 may be, for example, 5 seconds or less, 3 seconds or less, or 2 seconds or less.
- the curing of the adhesive layer 2 is sufficiently advanced by heating and pressing in the pressure oven 90 . However, the curing of the adhesive layer 2 may partially progress during the heating and pressing process for forming the joined body 50 .
- the heating temperature of the pressure oven 90 may be a temperature that is lower than the melting point of the connecting portions 20 and 24 and at which the curing of the adhesive layer 2 progresses.
- a bonded body 50 having a plurality of semiconductor chips 30' is formed, and then the bonded body 50 is formed. It may be heated and pressurized in a pressurized oven 90 .
- the adhesive layer 2 between the semiconductor chips 30' initially placed on the semiconductor wafer 30 and the semiconductor wafer 30 is given a thermal history by the stage 60 until the mounting of all the semiconductor chips 30' is completed. continue to be Even after being subjected to a long-term heat history, the adhesive layer 2 containing the adhesive according to the above-described embodiments can provide the joined body 50 with high reliability.
- the method for manufacturing a semiconductor device heats the connection portions and the adhesive layer of the semiconductor chips while interposing an adhesive layer containing an adhesive between a plurality of semiconductor chips having a plurality of connection portions. and a step of electrically connecting the connection portions of the plurality of semiconductor chips to each other and sealing at least a part of the connection portions electrically connected to each other with a hardened adhesive.
- the semiconductor adhesive of the present embodiment and the adhesive layer formed therefrom have excellent embedding properties and adhesive strength after curing, and remove oxide films formed on the solder surface even in short-time soldering. It is possible to improve solder wettability. Therefore, in the joined body 50, the occurrence of voids is sufficiently suppressed, the connection portions are satisfactorily joined together, and the semiconductor chip 30' and the wiring circuit board 40, the semiconductor wafer 30, or other semiconductor chips have sufficient adhesive strength. It can be adhered and have excellent reflow crack resistance and connection reliability.
- the obtained resin varnish is coated on a substrate film (manufactured by Teijin DuPont Films Limited, trade name "Purex A55") with a small precision coating device (Radoi Seiki Co., Ltd.), and a clean oven (ESPEC by drying under conditions of 100° C./5 min. to obtain film-like adhesives for semiconductors of Examples 1 to 4 and Comparative Example 1 with a thickness of 20 ⁇ m.
- CTE coefficient of linear expansion
- Visible light transmittance was measured for the semiconductor adhesives of Examples 1 to 4, which were excellent in melt viscosity and coefficient of linear expansion (CTE).
- the visible light transmittance was measured using a U-3310 spectrophotometer (manufactured by Hitachi, Ltd.).
- the measurement procedure is, after performing baseline correction measurement using a base film (trade name “Purex A55” manufactured by Teijin DuPont Films Co., Ltd.) as a reference material, the film adhesive of the example is exposed to visible light of 400 to 800 nm.
- the transmittance of the area was measured, and the transmittance at 550 nm was taken as the visible light transmittance. Table 1 shows the results.
- the adhesives for semiconductors of Examples 1 to 4 tended to have smaller melt viscosities at 130° C. and similar or lower coefficients of linear expansion than the adhesives for semiconductors of Comparative Example 1. . From these results, it was confirmed that the semiconductor adhesive of the present disclosure can suppress warping of semiconductor chips while having good fluidity during mounting.
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Abstract
Description
(A)成分としては、硬化して接着作用を有するものであれば特に限定されず、例えば、エポキシ樹脂ハンドブック(新保正樹編、日刊工業新聞社、1987年)等に記載されるエポキシ樹脂を広く使用することができる。(A)成分としては、例えば、ビスフェノールA型エポキシ等の二官能エポキシ樹脂、フェノールノボラック型エポキシ樹脂、クレゾールノボラック型エポキシ樹脂等のノボラック型エポキシ樹脂、トリスフェノールメタン型エポキシ樹脂などが挙げられる。(A)成分は、多官能エポキシ樹脂、グリシジルアミン型エポキシ樹脂、複素環含有エポキシ樹脂、脂環式エポキシ樹脂等の一般に知られているものを用いることができる。
(B)成分としては、例えば、イミダゾール系硬化剤、フェノール樹脂系硬化剤、酸無水物系硬化剤、アミン系硬化剤、ホスフィン系硬化剤等が挙げられる。これらの中でも、(B)成分は、イミダゾール系硬化剤であってよい。
(C)成分としては、例えば、ポリエステル樹脂、ポリエーテル樹脂、ポリアミド樹脂、ポリアミドイミド樹脂、ポリイミド樹脂、ポリビニルブチラール樹脂、ポリビニルホルマール樹脂、フェノキシ樹脂、ポリヒドロキシポリエーテル樹脂、アクリル樹脂、ポリスチレン樹脂、ブタジエン樹脂、アクリロニトリル・ブタジエン共重合体、アクリロニトリル・ブタジエン・スチレン樹脂、スチレン・ブタジエン共重合体、アクリル酸共重合体が挙げられる。
(D)成分としては、例えば、ガラス、シリカ、アルミナ、酸化チタン、カーボンブラック、マイカ、窒化ホウ素が挙げられる。これらの中でも、シリカ、アルミナ、酸化チタン、及び窒化ホウ素からなる群より選ばれる少なくとも1種であってよく、シリカ、アルミナ、及び窒化ケイ素からなる群より選ばれる少なくとも1種であってもよい。
・条件(a):(D)成分は、平均粒径が100~400nmである無機フィラー(以下、「(D1)成分」という場合がある。)を含む。
・条件(b):(D)成分は、(D)成分の粒度分布を動的光散乱法で測定したときに、得られる粒度分布において、粒径100~400nmの位置に少なくとも1つの極大値を示す。
(A)成分:エポキシ樹脂
・A-1:トリフェノールメタン骨格含有多官能固形エポキシ樹脂(三菱ケミカル株式会社製、商品名「EP1032H60」)
・A-2:ビスフェノールF型液状エポキシ樹脂(三菱ケミカル株式会社製、商品名「YL983U」)
・A-3:柔軟性エポキシ樹脂(三菱ケミカル株式会社製、商品名「YX7110B80」)
(B)成分:硬化剤
・B-1:2,4-ジアミノ-6-[2’-メチルイミダゾリル-(1’)]-エチル-s-トリアジンイソシアヌル酸付加体(四国化成工業株式会社製、商品名「2MAOK-PW」)
(C)成分:熱可塑性樹脂
・C-1:フェノキシ樹脂(新日鉄住金化学株式会社製、商品名「FX293」)
(D)成分:無機フィラー
・D1-1:メタクリルシラン処理シリカフィラー(平均粒径:180nm)(株式会社アドマテックス製、商品名「KG180G-HLA」)
・D1-2:メタクリルシラン処理シリカフィラー(平均粒径300nm)(株式会社アドマテックス製、商品名「3SM-EH1」)
・D2-1:メタクリルシラン表面処理シリカフィラー(平均粒径50nm)(株式会社アドマテックス製、商品名「YA050C-SE1」)
・D3-1:シリカフィラー(平均粒径500nm)(株式会社アドマテックス製、商品名「SE2050」)
・D3-2:エポキシシラン処理シリカフィラー(平均粒径500nm)(株式会社アドマテックス製、商品名「SE2050-SEJ」)
表1に示す配合量(単位:質量部)の(A)成分、(B)成分、(C)成分、及び(D)成分を、NV値(固形分量)が50質量%になるように有機溶媒(シクロヘキサノン)に添加した。その後、固形分量と同質量のΦ1.0mmのビーズ及びΦ2.0mmのジルコニアビーズを同容器内に加え、ボールミル(フリッチュ・ジャパン株式会社、遊星型微粉砕機P-7)で30分撹拌した。撹拌後、ジルコニアビーズをろ過によって除去し、樹脂ワニスを調製した。
(溶融粘度の測定)
実施例及び比較例の半導体用接着剤を用いて、130℃での溶融粘度(130℃ずり粘度)を回転式レオメーター(TAInstruments社製、商品名:ARES-G2)を用いて測定した。結果を表1に示す。
実施例及び比較例の半導体用接着剤を、170℃で2時間の条件で硬化させることによって、評価サンプルを作製した。得られた評価サンプルについて、熱機械分析装置(商品名「TMA/SS7100」、株式会社日立ハイテクサイエンス製)を用いて線膨張係数(CTE)を測定した。測定モードは引張りモードであり、測定荷重は20~49mNであり、測定雰囲気は大気雰囲気であり、昇温速度は1stランが10℃/分、2ndランが5℃/分とし、2ndランの50~70℃における測定結果をα1(ppm/℃)とした。結果を表1に示す。
溶融粘度及び線膨張係数(CTE)に優れていた実施例1~4の半導体用接着剤について可視光透過率を測定した。可視光透過率は、U-3310形分光光度計(株式会社日立製作所製)を用いて測定した。測定手順は、基材フィルム(帝人デュポンフィルム株式会社製、商品名「ピューレックスA55」)を基準物質としてベースライン補正測定を行った後、実施例のフィルム状接着剤を400~800nmの可視光領域の透過率を測定し、550nmにおける透過率を可視光透過率とした。結果を表1に示す。
Claims (11)
- 半導体チップの複数の接続部及び配線回路基板の複数の接続部が互いに電気的に接続された半導体装置、又は、複数の半導体チップのそれぞれの複数の接続部が互いに電気的に接続された半導体装置において、互いに電気的に接続された前記接続部のうち少なくとも一部を封止するために用いられる半導体用接着剤であって、
前記半導体用接着剤が、エポキシ樹脂と、硬化剤と、熱可塑性樹脂と、無機フィラーとを含有し、
前記無機フィラーが、平均粒径が100~400nmである無機フィラーを含む、半導体用接着剤。 - 半導体チップの複数の接続部及び配線回路基板の複数の接続部が互いに電気的に接続された半導体装置、又は、複数の半導体チップのそれぞれの複数の接続部が互いに電気的に接続された半導体装置において、互いに電気的に接続された前記接続部のうち少なくとも一部を封止するために用いられる半導体用接着剤であって、
前記半導体用接着剤が、エポキシ樹脂と、硬化剤と、熱可塑性樹脂と、無機フィラーとを含有し、
前記無機フィラーが、前記無機フィラーを動的光散乱法によって粒度分布を測定したときに、得られる粒度分布において、粒径100~400nmの位置に少なくとも1つの極大値を示す、半導体用接着剤。 - 前記無機フィラーの含有量が、半導体用接着剤の全量を基準として、20~60質量%である、請求項1又は2に記載の半導体用接着剤。
- 前記無機フィラーが、シリカ、アルミナ、及び窒化ケイ素からなる群より選ばれる少なくとも1種である、請求項1~3のいずれか一項に記載の半導体用接着剤。
- 前記熱可塑性樹脂の重量平均分子量が20000~200000である、請求項1~4のいずれか一項に記載の半導体用接着剤。
- 前記硬化剤がイミダゾール系硬化剤である、請求項1~5のいずれか一項に記載の半導体用接着剤。
- 有機酸をさらに含有する、請求項1~6のいずれか一項に記載の半導体用接着剤。
- 支持基材と、前記支持基材上に設けられ、請求項1~7のいずれか一項に記載の半導体用接着剤を含む接着剤層とを備える、半導体用接着剤シート。
- 前記支持基材が、プラスチックフィルムと前記プラスチックフィルム上に設けられた粘着剤層とを有し、前記接着剤層が前記粘着剤層上に設けられている、請求項8に記載の半導体用接着剤シート。
- 複数の接続部を有する半導体チップと複数の接続部を有する配線回路基板との間に接着剤を介在させながら、前記半導体チップ、前記配線回路基板、及び前記接着剤を加熱及び加圧することにより、前記半導体チップの前記接続部及び前記配線回路基板の前記接続部が互いに電気的に接続され、互いに電気的に接続された前記接続部のうち少なくとも一部が、硬化した前記接着剤によって封止されている、接合体を形成する工程、
複数の接続部を有する複数の半導体チップの間に接着剤を介在させながら、前記半導体チップ、及び前記接着剤を加熱及び加圧することにより、複数の前記半導体チップの前記接続部が互いに電気的に接続され、互いに電気的に接続された前記接続部のうち少なくとも一部が、硬化した前記接着剤によって封止されている、接合体を形成する工程、並びに、
複数の接続部を有する半導体チップと複数の接続部を有する半導体ウエハとの間に接着剤を介在させながら、前記半導体チップ、前記半導体ウエハ、及び前記接着剤を加熱することにより、前記半導体チップの前記接続部及び前記半導体ウエハの前記接続部が互いに電気的に接続され、互いに電気的に接続された前記接続部のうち少なくとも一部が、硬化した前記接着剤によって封止されている、接合体を形成する工程
から選ばれる少なくとも1つの工程を備え、
前記接着剤が、請求項1~7のいずれか一項に記載の半導体用接着剤である、半導体装置の製造方法。 - 2つの主面を有するウエハ本体、及び前記ウエハ本体の一方の主面上に設けられた複数の前記接続部を有する半導体ウエハを準備する工程と、
前記ウエハ本体の前記接続部側の主面上に前記接着剤を含む接着剤層を設ける工程と、
前記ウエハ本体の前記接続部とは反対側の主面を研削することにより、前記ウエハ本体を薄化する工程と、
薄化した前記ウエハ本体及び前記接着剤層をダイシングすることにより、前記半導体チップ及び前記接着剤層を有する接着剤付き半導体チップを形成する工程と、
をさらに備える、請求項10に記載の半導体装置の製造方法。
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