WO2012043764A1 - 接着剤組成物、半導体装置の製造方法及び半導体装置 - Google Patents
接着剤組成物、半導体装置の製造方法及び半導体装置 Download PDFInfo
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- WO2012043764A1 WO2012043764A1 PCT/JP2011/072462 JP2011072462W WO2012043764A1 WO 2012043764 A1 WO2012043764 A1 WO 2012043764A1 JP 2011072462 W JP2011072462 W JP 2011072462W WO 2012043764 A1 WO2012043764 A1 WO 2012043764A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- 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
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- 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
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- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/01—Manufacture or treatment
- H10W72/013—Manufacture or treatment of die-attach connectors
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- H10W72/01—Manufacture or treatment
- H10W72/012—Manufacture or treatment of bump connectors, dummy bumps or thermal bumps
- H10W72/01251—Changing the shapes of bumps
- H10W72/01255—Changing the shapes of bumps by using masks
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- H10W72/071—Connecting or disconnecting
- H10W72/072—Connecting or disconnecting of bump connectors
- H10W72/07231—Techniques
- H10W72/07236—Soldering or alloying
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- H10W72/071—Connecting or disconnecting
- H10W72/073—Connecting or disconnecting of die-attach connectors
- H10W72/07331—Connecting techniques
- H10W72/07337—Connecting techniques using a polymer adhesive, e.g. an adhesive based on silicone or epoxy
- H10W72/07338—Connecting techniques using a polymer adhesive, e.g. an adhesive based on silicone or epoxy hardening the adhesive by curing, e.g. thermosetting
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- H10W72/00—Interconnections or connectors in packages
- H10W72/20—Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
- H10W72/251—Materials
- H10W72/252—Materials comprising solid metals or solid metalloids, e.g. PbSn, Ag or Cu
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- H10W72/00—Interconnections or connectors in packages
- H10W72/20—Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
- H10W72/29—Bond pads specially adapted therefor
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- H10W72/00—Interconnections or connectors in packages
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- H10W72/00—Interconnections or connectors in packages
- H10W72/30—Die-attach connectors
- H10W72/351—Materials of die-attach connectors
- H10W72/352—Materials of die-attach connectors comprising metals or metalloids, e.g. solders
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- H10W72/00—Interconnections or connectors in packages
- H10W72/30—Die-attach connectors
- H10W72/351—Materials of die-attach connectors
- H10W72/353—Materials of die-attach connectors not comprising solid metals or solid metalloids, e.g. ceramics
- H10W72/354—Materials of die-attach connectors not comprising solid metals or solid metalloids, e.g. ceramics comprising polymers
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- H10W72/00—Interconnections or connectors in packages
- H10W72/90—Bond pads, in general
- H10W72/941—Dispositions of bond pads
- H10W72/9415—Dispositions of bond pads relative to the surface, e.g. recessed, protruding
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- H10W72/00—Interconnections or connectors in packages
- H10W72/90—Bond pads, in general
- H10W72/941—Dispositions of bond pads
- H10W72/942—Dispositions of bond pads relative to underlying supporting features, e.g. bond pads, RDLs or vias
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- H10W72/00—Interconnections or connectors in packages
- H10W72/90—Bond pads, in general
- H10W72/941—Dispositions of bond pads
- H10W72/944—Dispositions of multiple bond pads
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- H10W72/00—Interconnections or connectors in packages
- H10W72/90—Bond pads, in general
- H10W72/951—Materials of bond pads
- H10W72/952—Materials of bond pads comprising metals or metalloids, e.g. PbSn, Ag or Cu
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- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W74/00—Encapsulations, e.g. protective coatings
- H10W74/10—Encapsulations, e.g. protective coatings characterised by their shape or disposition
- H10W74/15—Encapsulations, e.g. protective coatings characterised by their shape or disposition on active surfaces of flip-chip devices, e.g. underfills
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- H10W90/00—Package configurations
- H10W90/20—Configurations of stacked chips
- H10W90/26—Configurations of stacked chips the stacked chips being of the same size without any chips being laterally offset, e.g. chip stacks having a rectangular shape
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- H10W90/00—Package configurations
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- H10W90/297—Configurations of stacked chips characterised by the through-semiconductor vias [TSVs] in the stacked chips
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- H10W90/00—Package configurations
- H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
- H10W90/721—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors
- H10W90/722—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors between stacked chips
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- H10W90/00—Package configurations
- H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
- H10W90/721—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors
- H10W90/724—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors between a chip and a stacked insulating package substrate, interposer or RDL
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- H10W99/00—Subject matter not provided for in other groups of this subclass
Definitions
- the present invention relates to an adhesive composition, a semiconductor device manufacturing method, and a semiconductor device.
- a COB (Chip On Board) type connection method that is widely used in BGA (Ball Grid Array), CSP (Chip Size Package), and the like also corresponds to the FC connection method.
- the FC connection method is also widely used in a COC (Chip On Chip) type connection method in which connection parts (bumps and wirings) are formed on a semiconductor chip to connect the semiconductor chips (for example, patents). Reference 1).
- connection methods are stacked and multi-staged, such as a chip stack package, POP (Package On Package), TSV (Through-Silicon Via), etc.
- POP Package On Package
- TSV Through-Silicon Via
- Such stacking / multi-stage technology arranges semiconductor chips and the like three-dimensionally, so that the package can be made smaller than the two-dimensional arrangement technique.
- the TSV technology is effective for improving semiconductor performance, reducing noise, reducing the mounting area, and saving power, and is attracting attention as a next-generation semiconductor wiring technology.
- connection part solder, tin, gold, silver, copper, nickel and the like, and conductive materials including these plural types are also used.
- the metal used in the connection part may be oxidized on the surface and an oxide film may be formed, or impurities such as oxide may adhere to the surface, which may cause impurities on the connection surface of the connection part. . If such impurities remain, there is a concern that the connectivity / insulation reliability between the semiconductor chip and the substrate or between the two semiconductor chips is lowered, and the merit of employing the above-described connection method is impaired.
- a method for suppressing the generation of these impurities and improving the connectivity there is a method of pre-treating the surface of the substrate or the semiconductor chip before connection, such as a preflux used for OSP (Organic Solderability Preservatives) processing.
- a preflux used for OSP Organic Solderability Preservatives
- the method of giving a rust preventive agent is mentioned.
- the pre-flux and the rust preventive agent may remain and deteriorate after pretreatment, which may reduce the connectivity.
- connection part between the semiconductor chip and the substrate with a semiconductor sealing material (adhesive for semiconductor sealing)
- the connection part is sealed simultaneously with the connection between the semiconductor chip and the substrate or the semiconductor chip. It becomes possible to do. Therefore, oxidation of the metal used for the connection part and adhesion of impurities to the connection part can be suppressed, and the connection part can be protected from the external environment. Therefore, it is possible to effectively improve connectivity / insulation reliability, workability, and productivity.
- thermal stress derived from the difference in thermal expansion coefficient between the semiconductor chip and the substrate or between the semiconductor chips does not concentrate on the connection portion to cause connection failure. In order to do so, it is necessary to seal the gap between the semiconductor chip and the substrate with a semiconductor sealing material. In particular, components having different thermal expansion coefficients are often used between the semiconductor chip and the substrate, and it is required to improve the thermal shock resistance by sealing with a semiconductor sealing material.
- the above-described sealing methods using a semiconductor sealing material can be broadly divided into a capillary-flow method and a pre-applied method (see, for example, Patent Documents 2 to 6).
- the Capillary-Flow method is a method in which a liquid semiconductor sealing material is injected into the gap between the semiconductor chip and the substrate by capillary action after the semiconductor chip and the substrate are connected.
- the pre-applied method is a method of connecting a semiconductor chip and a substrate after supplying a semiconductor sealing material in the form of a paste or film to the semiconductor chip or substrate before connecting the semiconductor chip and the substrate.
- the gap between the semiconductor chip and the substrate is becoming narrower with the recent progress of miniaturization of semiconductor devices, and the Capillary-Flow method requires a long time for implantation and decreases productivity.
- the pre-applied method has become the mainstream as a method for manufacturing a package capable of high functionality, high integration, and high speed.
- the gap between the semiconductor chip and the substrate is sealed with the semiconductor sealing material at the same time as the connection by heating and pressurization, so the components contained in the semiconductor sealing material are selected in consideration of the connection conditions.
- metal bonding is used for connection between connection portions from the viewpoint of sufficiently ensuring connectivity and insulation reliability. Since metal bonding is a connection method using a high temperature (for example, 200 ° C. or higher), it is caused by volatile components remaining in the semiconductor sealing material and newly generated volatile components by decomposition of the components contained in the semiconductor sealing material.
- the semiconductor sealing material may foam. Thereby, bubbles called voids are generated, and the semiconductor sealing material is peeled off from the semiconductor chip and the substrate.
- connection failure such as breakage of the connection portion due to tearing of the connection bump connecting the connection portions occurs. Due to these reasons, there is a concern that the conventional semiconductor encapsulating material may deteriorate in connectivity and insulation reliability.
- the semiconductor sealing material does not have sufficient flux activity (removal effect of oxide film and impurities on the metal surface), the oxide film and impurities on the metal surface cannot be removed, and a good metal-metal junction is formed. In some cases, continuity cannot be ensured. Furthermore, if the insulation reliability of the semiconductor sealing material is low, it is difficult to cope with the narrow pitch of the connection portion, resulting in insulation failure. For these reasons, there is a concern that the conventional semiconductor encapsulating material may deteriorate in connectivity and insulation reliability.
- Semiconductor devices manufactured using a semiconductor sealing material are required to achieve a sufficient level in terms of reliability, more specifically, heat resistance, moisture resistance, and reflow resistance.
- heat resistance more specifically, heat resistance, moisture resistance, and reflow resistance.
- reflow resistance it is required to maintain a high adhesive strength that can suppress the peeling or breaking of the die bond layer (adhesive layer) at a reflow temperature of around 260 ° C.
- the present invention has been made in view of the above circumstances, and provides an adhesive composition capable of manufacturing a semiconductor device having excellent reflow resistance, connection reliability, and insulation reliability, and a semiconductor device using the adhesive composition
- An object of the present invention is to provide a manufacturing method and a semiconductor device.
- the present invention relates to a semiconductor device in which connection portions of a semiconductor chip and a printed circuit board are electrically connected to each other, or a connection portion in a semiconductor device in which connection portions of a plurality of semiconductor chips are electrically connected to each other.
- An adhesive composition containing an epoxy resin, a curing agent, and an acrylic surface-treated filler surface-treated with a compound having a group represented by the following general formula (1) A composition is provided.
- R 1 represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms
- R 2 represents an alkylene group having 1 to 30 carbon atoms.
- the present invention also provides a connection in a semiconductor device in which the connection portions of the semiconductor chip and the printed circuit board are electrically connected to each other, or a semiconductor device in which the connection portions of the plurality of semiconductor chips are electrically connected to each other.
- An adhesive composition for sealing a part which contains an epoxy resin, a curing agent, and a filler having a group represented by the following general formula (1).
- R 1 represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms
- R 2 represents an alkylene group having 1 to 30 carbon atoms.
- the adhesive composition of the present invention contains an epoxy resin and a curing agent, and further contains an acrylic surface treatment filler or a filler having a group represented by the general formula (1), thereby increasing the temperature (for example, high reflow resistance, connection reliability, and insulation reliability can be realized even when applied as an adhesive for semiconductor sealing in a flip chip connection method in which metal bonding is performed at 200 ° C. or higher.
- a silane coupling agent when included in a resin together with a filler that is not surface-treated, the filler surface is subjected to a silane coupling treatment, and fillers of various surface states are synthesized by substituents of the silane coupling agent. It is known that However, the volatility of the silane coupling agent is high, which causes voids in the manufacturing process of a semiconductor device having a process at a high temperature such as metal bonding that requires high-temperature connection. Similarly, when surface-treating a conventionally used filler, a highly volatile organic substance such as methanol may be generated, which causes a void.
- an insulating film called a solder resist is formed on a semiconductor substrate, and the solder resist often contains an acrylic material. Therefore, the present inventors include the above-mentioned acrylic surface treatment filler or a filler having a group represented by the above general formula (1), whereby the elastic modulus at high temperature and the adhesive strength after moisture absorption of the adhesive composition. It has been found that reflow resistance can be realized.
- the adhesive composition of the present invention the generation of a highly volatile substance is suppressed by using a surface-treated acrylic surface-treated filler or a filler having a group represented by the above general formula (1).
- the present inventors speculate that the acrylic compound can improve the connectivity with the substrate because of its excellent adhesion to the solder resist.
- the acrylic surface treatment filler or the filler having the group represented by the general formula (1) is difficult to lower the insulation reliability of the connection portion, and the thermal expansion coefficient and elastic modulus of the cured product of the adhesive composition are reduced.
- the present inventors presume that the connection reliability can be improved because it is difficult to lower.
- An acrylic surface-treated filler or a filler having a group represented by the above general formula (1) has excellent dispersibility in a resin component, and is a package (substrate-substrate) in a semiconductor device manufactured using the adhesive composition of the present invention.
- the strength of the end portion can be improved.
- the above-mentioned improvement in adhesive strength is not limited on the solder resist, but also appears between the semiconductor chips (SiO, SiN, etc.).
- the compound having a group represented by the general formula (1) is preferably a compound represented by the following general formula (2).
- R 1 represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms
- R 2 represents an alkylene group having 1 to 30 carbon atoms
- R 3 represents an alkyl group having 1 to 30 carbon atoms.
- the adhesive composition of the present invention can further improve reflow resistance, connection reliability and insulation reliability by containing a filler surface-treated with the compound represented by the general formula (2). .
- the adhesive composition of the present invention may further contain a polymer component having a weight average molecular weight of 10,000 or more from the viewpoint of improving the heat resistance and film forming property of the adhesive composition.
- the polymer component preferably has a weight average molecular weight of 30000 or more and a glass transition temperature of 100 ° C. or less.
- the adhesive composition of the present invention can further contain a flux activator to increase the flux activity and remove an oxide film and impurities on the metal surface of the connection portion to form a good metal-metal bond. it can.
- the adhesive composition of the present invention has a film shape. It is preferable that
- the present invention also provides a semiconductor device in which respective connection portions of a semiconductor chip and a printed circuit board are electrically connected to each other, or a semiconductor device in which respective connection portions of a plurality of semiconductor chips are electrically connected to each other. It is a method, Comprising: The manufacturing method of a semiconductor device provided with the process of sealing a connection part using said adhesive composition is provided.
- the method for manufacturing a semiconductor device of the present invention by using the adhesive composition, the reflow resistance, the connection reliability, and the insulation reliability of the semiconductor device can be improved.
- connection part contains at least one metal selected from the group consisting of gold, silver, copper, nickel, tin and lead as a main component, the electrical conductivity, thermal conductivity and connection reliability of the connection part are further improved. can do.
- the present invention also provides a semiconductor device obtained by the method for manufacturing a semiconductor device.
- the semiconductor device of the present invention is manufactured using the method for manufacturing a semiconductor device described above, the reflow resistance, connection reliability, and insulation reliability are sufficiently excellent.
- an adhesive composition excellent in reflow resistance, connection reliability, and insulation reliability a method for manufacturing a semiconductor device using the adhesive composition, and a semiconductor device.
- the adhesive composition (adhesive for semiconductor encapsulation) of the present embodiment is a semiconductor in which respective connection portions of a semiconductor chip and a printed circuit board (hereinafter simply referred to as “substrate” in some cases) are electrically connected to each other.
- the adhesive composition is optionally composed of a polymer component having a weight average molecular weight of 10,000 or more (hereinafter referred to as “(d) component”) or a flux activator (hereinafter referred to as “(e) component”. ").
- a polymer component having a weight average molecular weight of 10,000 or more hereinafter referred to as “(d) component”
- a flux activator hereinafter referred to as “(e) component”.
- Epoxy Resin Any epoxy resin can be used without particular limitation as long as it has two or more epoxy groups in the molecule.
- Specific examples of the component (a) include bisphenol A type, bisphenol F type, naphthalene type, phenol novolak type, cresol novolak type, phenol aralkyl type, biphenyl type, triphenylmethane type, dicyclopentadiene type and various polyfunctionalities.
- Epoxy resins can be used. These can be used alone or as a mixture of two or more.
- the thermal weight loss rate at 250 ° C. is 5% or less. It is preferable to use an epoxy resin. In the case of 300 ° C., it is preferable to use an epoxy resin having a thermal weight loss rate at 300 ° C. of 5% or less.
- (B) Component Curing Agent
- the (b) component include a phenol resin curing agent, an acid anhydride curing agent, an amine curing agent, an imidazole curing agent, and a phosphine curing agent.
- the component contains a phenolic hydroxyl group, an acid anhydride, an amine or an imidazole, it exhibits a flux activity that suppresses the formation of an oxide film at the connection part, and improves connection reliability and insulation reliability. it can.
- each curing agent will be described.
- Phenolic resin-based curing agent The phenolic resin-based curing agent is not particularly limited as long as it has two or more phenolic hydroxyl groups in the molecule.
- phenol novolak, cresol novolak, phenol aralkyl resin, cresol A naphthol formaldehyde polycondensate, a triphenylmethane type polyfunctional phenol, and various polyfunctional phenol resins can be used. These can be used alone or as a mixture of two or more.
- the equivalent ratio of the phenol resin curing agent to the component (a) is 0.3 to 1.5 from the viewpoint of good curability, adhesiveness and storage stability. It is preferably 0.4 to 1.0, more preferably 0.5 to 1.0.
- the equivalent ratio is 1.5 or less, the unreacted phenolic hydroxyl group does not remain excessively, and the water absorption is increased. It tends to be kept low and the insulation reliability improves.
- Acid anhydride curing agent examples include methylcyclohexanetetracarboxylic dianhydride, trimellitic anhydride, pyromellitic anhydride, benzophenonetetracarboxylic dianhydride, and ethylene glycol bis.
- Anhydro trimellitate can be used. These can be used alone or as a mixture of two or more.
- the equivalent ratio of the acid anhydride-based curing agent to the component (a) is 0.3 to 1. from the viewpoint of good curability, adhesiveness, and storage stability. 5 is preferable, 0.4 to 1.0 is more preferable, and 0.5 to 1.0 is still more preferable.
- the equivalence ratio is 0.3 or more, the curability is improved and the adhesive force tends to be improved.
- the equivalent ratio is 1.5 or less, the unreacted acid anhydride does not remain excessively, and the water absorption rate is increased. It tends to be kept low and the insulation reliability improves.
- Amine-based curing agent for example, dicyandiamide can be used.
- the equivalent ratio of the amine curing agent to the component (a) is preferably 0.3 to 1.5 from the viewpoint of good curability, adhesion and storage stability. 4-1.0 is more preferable, and 0.5-1.0 is still more preferable. If the equivalence ratio is 0.3 or more, the curability tends to be improved and the adhesive strength tends to be improved. If the equivalent ratio is 1.5 or less, excessive unreacted amine does not remain and the insulation reliability is improved. Tend to.
- Imidazole-based curing agent examples include 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1- Cyanoethyl-2-undecylimidazole, 1-cyano-2-phenylimidazole, 1-cyanoethyl-2-undecylimidazole trimellitate, 1-cyanoethyl-2-phenylimidazolium trimellitate, 2,4-diamino-6 -[2'-methylimidazolyl- (1 ')]-ethyl-s-triazine, 2,4-diamino-6- [2'-undecylimidazolyl- (1')]-ethyl-s-triazine, 2, 4-Diamino-6- [2′-ethyl-4′-methylimidazolyl
- the content of the imidazole curing agent is preferably 0.1 to 20 parts by mass, more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of component (a). If the content of the imidazole-based curing agent is 0.1 parts by mass or more, the curability tends to be improved, and if it is 20 parts by mass or less, the adhesive composition may be cured before the metal bond is formed. There is a tendency that poor connection is less likely to occur.
- (V) Phosphine curing agent examples include triphenylphosphine, tetraphenylphosphonium tetraphenylborate, tetraphenylphosphonium tetra (4-methylphenyl) borate and tetraphenylphosphonium (4-fluorophenyl) borate. Can be mentioned.
- the content of the phosphine-based curing agent is preferably 0.1 to 10 parts by mass and more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the component (a). If the content of the phosphine-based curing agent is 0.1 parts by mass or more, curability tends to be improved, and if it is 10 parts by mass or less, the adhesive composition may be cured before a metal bond is formed. There is a tendency that poor connection is less likely to occur.
- a phenol resin curing agent, an acid anhydride curing agent, and an amine curing agent can be used singly or as a mixture of two or more.
- the imidazole-based curing agent and the phosphine-based curing agent may each be used alone, but may be used together with a phenol resin-based curing agent, an acid anhydride-based curing agent, or an amine-based curing agent.
- the adhesive composition contains a phenol resin curing agent, an acid anhydride curing agent or an amine curing agent as the component (b), it exhibits a flux activity for removing an oxide film and further improves connection reliability. Can do.
- a surface treatment is performed with a compound having a group represented by the above general formula (1). If it is a filler, there is no restriction
- R 1 represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms, and is preferably a hydrogen atom, a methyl group, or an ethyl group.
- R 2 represents an alkylene group having 1 to 30 carbon atoms, preferably an alkylene group having 1 to 15 carbon atoms. When the number of carbon atoms of R 2 exceeds 30, it tends to prevent the surface treatment of the filler.
- Whether the component (c) has a group represented by the general formula (1) on the filler surface can be confirmed, for example, by the following method.
- the adhesive composition of the present embodiment is heated, and the generated methanol is measured using gas chromatography (for example, product name “GC-17A” manufactured by SHIMADZU). From the amount of the methanol, it can be confirmed that it has a group represented by the general formula (1) present on the filler surface. In this case, the methanol amount of the adhesive composition not containing the component (C) is measured in the same manner as a reference.
- gas chromatography for example, product name “GC-17A” manufactured by SHIMADZU.
- Examples of the insulating inorganic filler include glass, silica, alumina, titanium oxide, carbon black, mica, and boron nitride. Silica, alumina, titanium oxide, and boron nitride are preferable, and silica, alumina, and boron nitride are more preferable. preferable.
- Examples of whiskers include aluminum borate, aluminum titanate, zinc oxide, calcium silicate, magnesium sulfate, and boron nitride.
- Examples of the resin filler include polyurethane and polyimide. These fillers and whiskers can be used alone or as a mixture of two or more. The shape, particle size and blending amount of the filler are not particularly limited. Fine nanosilica may be used. Among these fillers, silica filler is preferable because of easy surface treatment and relatively good compatibility with the resin component.
- a filler surface-treated with the compound represented by the general formula (2) can be used as the component (c).
- silica filler surface-treated with an acrylic compound in which R 1 is a hydrogen atom silica filler surface-treated with a methacrylic compound in which R 1 is a methyl group, and R A silica filler surface-treated with an ethacryl compound in which 1 is an ethyl group can be used.
- R 1 is preferably a non-bulky group, and R 1 is a hydrogen atom or carbon.
- R 1 As the number of carbons in R 1 increases, the bulk increases. When the number of carbons exceeds 2, the reactivity tends to decrease. That is, as the component (c), a silica filler surface-treated with an acrylic compound, a methacrylic compound, or an ethacrylic compound can be used.
- R 2 represents an alkylene group having 1 to 30 carbon atoms, and is preferably an alkylene group having 1 to 15 carbon atoms because it has a small amount of volatile components.
- R 3 represents an alkyl group having 1 to 30 carbon atoms and can be appropriately selected depending on the ease of surface treatment. When the carbon number of R 3 is 30 or less, the filler tends to be surface treated.
- the shape and particle size of the component may be appropriately set according to the use of the adhesive composition, and are not particularly limited.
- the average particle diameter of component (C) is preferably 2 ⁇ m or less, and in packages where narrow pitch and narrow gap are advanced, avoiding a decrease in reliability due to trapping. Therefore, it is more preferably 1.5 ⁇ m or less, and particularly preferably 1.0 ⁇ m or less. Further, the lower limit is more preferably 0.005 ⁇ m or more, and particularly preferably 0.01 ⁇ m or less, from the viewpoint of handleability.
- the blending amount of component (c) is preferably 5 to 80% by mass, more preferably 10 to 70% by mass, based on the total solid content of the adhesive composition. If it is 5% by mass or more, the adhesive force tends to be strongly improved, and if it is 80% by mass or less, the viscosity is easily adjusted, the fluidity of the adhesive composition is lowered, and the filler bites into the connection part. It is difficult for trapping (trapping) to occur, and connection reliability tends to be improved.
- silane coupling agent is not surface-treated with the filler in advance and is added as a constituent component of the adhesive composition and the surface treatment is performed in the system, methanol or the like is generated, which causes foaming during a high-temperature process.
- Component (d) Polymer component having a weight average molecular weight of 10,000 or more
- component (d) include phenoxy resin, polyimide resin, polyamide resin, polycarbodiimide resin, cyanate ester resin, acrylic resin, polyester resin, polyethylene resin, poly Examples include ether sulfone resin, polyetherimide resin, polyvinyl acetal resin, urethane resin, and acrylic rubber.
- phenoxy resin, polyimide resin, acrylic rubber, cyanate ester resin, and polycarbodiimide resin are preferable, and phenoxy resin, polyimide resin, and acrylic rubber are more preferable.
- These components (d) can be used alone or as a mixture or copolymer of two or more. However, the (d) component does not include the epoxy resin as the (a) component.
- polymer components such as the phenoxy resin and polyimide resin described above, or synthesized components may be used.
- the polyimide resin can be obtained, for example, by subjecting tetracarboxylic dianhydride and diamine to a condensation reaction by a known method. More specifically, tetracarboxylic dianhydride and diamine are mixed in equimolar or nearly equimolar amounts in an organic solvent (the order of addition of each component is arbitrary), and the reaction temperature is 80 ° C. or lower, preferably 0 to The addition reaction may be set at 60 ° C.
- the tetracarboxylic dianhydride is preferably recrystallized and purified with acetic anhydride in order to suppress deterioration of various properties of the adhesive composition.
- polyamic acid which is a polyimide precursor
- the polyimide resin can be obtained by dehydrating and ring-closing the polyamic acid.
- the dehydration ring closure can be performed by a thermal ring closure method in which heat treatment is performed or a chemical ring closure method using a dehydrating agent.
- the molecular weight of the polyamic acid can be adjusted by heating at 50 to 80 ° C. for depolymerization.
- the tetracarboxylic dianhydride used as a raw material for the polyimide resin is not particularly limited.
- a represents an integer of 2 to 20.
- the tetracarboxylic dianhydride represented by the above general formula (I) can be synthesized from trimellitic anhydride monochloride and the corresponding diol, specifically, 1,2- (ethylene) bis (trimellitate).
- Anhydride 1,3- (trimethylene) bis (trimellitic anhydride), 1,4- (tetramethylene) bis (trimellitic anhydride), 1,5- (pentamethylene) bis (trimellitic anhydride), 1, 6- (Hexamethylene) bis (trimellitic anhydride), 1,7- (heptamethylene) bis (trimellitic anhydride), 1,8- (octamethylene) bis (trimellitic anhydride), 1,9- (nonamethylene) Bis (trimellitic anhydride), 1,10- (decamethylene) bis (trimellitic anhydride), 1,12- (dodecamethylene) Scan (trimellitate anhydride), 1,16 (hexamethylene decamethylene) bis (trimellitate an
- tetracarboxylic dianhydride a tetracarboxylic dianhydride represented by the above formula (II) is preferable in that it can provide excellent moisture resistance reliability.
- the said tetracarboxylic dianhydride can be used individually or in combination of 2 or more types.
- the content of the tetracarboxylic dianhydride represented by the above formula (II) is preferably 40 mol% or more, more preferably 50 mol% or more, and more preferably 70 mol% or more based on the total tetracarboxylic dianhydride. Further preferred. When the content is 40 mol% or more, there is a tendency to sufficiently ensure the effect of moisture resistance reliability due to the use of the tetracarboxylic dianhydride represented by the above formula (II).
- the diamine used as a raw material for the polyimide resin is not particularly limited, and examples thereof include o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, 3,3′-diaminodiphenyl ether, 3,4′-diaminodiphenyl ether, 4,4′-diaminodiphenyl ether, 3,3′-diaminodiphenylmethane, 3,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylethermethane, bis (4-amino-3,5-dimethylphenyl) methane, bis ( 4-amino-3,5-diisopropylphenyl) methane, 3,3′-diaminodiphenyldifluoromethane, 3,4′-diaminodiphenyldifluoromethane, 4,4′-diaminodipheny
- Q 1 , Q 2 and Q 3 each independently represents an alkylene group having 1 to 10 carbon atoms, and b represents an integer of 1 to 80.
- Q 4 , Q 5 , Q 6 and Q 7 each independently represent an alkylene group having 1 to 10 carbon atoms, and c, d and e each independently represents an integer of 1 to 50.
- f represents an integer of 5 to 20.
- Q 8 and Q 13 each independently represent an alkylene group having 1 to 5 carbon atoms or a phenylene group which may have a substituent
- Q 9 , Q 10 , Q 11 and Q 12 are each Independently, it represents an alkyl group having 1 to 5 carbon atoms, a phenyl group or a phenoxy group
- g represents an integer of 1 to 5.
- the diamine represented by the above general formula (III), (IV) or (V) is preferable in that low stress property, low temperature laminating property and low temperature adhesiveness can be imparted, and has low water absorption and low water absorption.
- the diamine represented by the said general formula (VI) is preferable at the point which can provide.
- the content of the aliphatic ether diamine represented by the general formula (III) or (IV) is preferably 1 to 50 mol% of the total diamine, and the aliphatic diamine represented by the general formula (V)
- the content of is preferably 20 to 80 mol% of the total diamine, and the content of the siloxane diamine represented by the general formula (VI) is preferably 20 to 80 mol% of the total diamine.
- the content is within the above range, the effect of imparting low temperature laminating properties and low water absorption tends to increase.
- aliphatic ether diamine represented by the general formula (III) include aliphatic ether diamines represented by the following formulas (III-1) to (III-5).
- n represents an integer of 1 or more.
- the weight average molecular weight of the aliphatic ether diamine represented by the general formula (III-4) is preferably 350, 750, 1100 or 2100, for example.
- the weight average molecular weight of the aliphatic ether diamine represented by the general formula (III-5) is preferably 230, 400, or 2000, for example.
- the above general formula (IV), the following general formula (VII), (VIII) or (IX) is used in that low-temperature laminating properties and good adhesion to a substrate with an organic resist can be secured.
- the aliphatic ether diamine represented respectively is more preferable.
- h represents an integer of 2 to 80, more preferably 2 to 70.
- c, d and e represent an integer of 1 to 50, more preferably 2 to 40.
- j and k each independently represent an integer of 1 to 70.
- aliphatic ether diamine represented by the above general formula (VII) examples include Jeffamine D-230, D-400, D-2000, D-4000, and BASF manufactured by Sun Techno Chemical Co., Ltd. Polyether amines D-230, D-400 and D-2000 can be mentioned.
- Specific examples of the aliphatic ether diamine represented by the general formula (VIII) include Jeffamine ED manufactured by Sun Techno Chemical Co., Ltd. -600, ED-900, and ED-2001.
- Examples of the aliphatic ether diamine represented by the above formula (IX) examples include Jeffamine EDR-148 manufactured by Sun Techno Chemical Co., Ltd.
- Examples of the aliphatic diamine represented by the general formula (V) include 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6- Diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, 1,11-diaminoundecane, 1,12-diaminododecane and 1,2-diaminocyclohexane Is mentioned. Among these, 1,9-diaminononane, 1,10-diaminodecane, 1,11-diaminoundecane and 1,12-diaminododecane are preferable.
- siloxane diamine represented by the general formula (VI) when g in the general formula (VI) is 1, 1,1,3,3-tetramethyl-1,3-bis (4-amino) Phenyl) disiloxane, 1,1,3,3-tetraphenoxy-1,3-bis (4-aminoethyl) disiloxane, 1,1,3,3-tetraphenyl-1,3-bis (2-amino) Ethyl) disiloxane, 1,1,3,3-tetraphenyl-1,3-bis (3-aminopropyl) disiloxane, 1,1,3,3-tetramethyl-1,3-bis (2-amino) Ethyl) disiloxane, 1,1,3,3-tetramethyl-1,3-bis (3-aminopropyl) disiloxane, 1,1,3,3-tetramethyl-1,3-bis (3-aminopropyl) disiloxane, 1,1,3,3-tetramethyl-1,3-
- the above polyimide resins can be used alone or as a mixture of two or more.
- the glass transition temperature (Tg) of the component (d) is preferably 100 ° C. or less, more preferably 85 ° C. or less, from the viewpoint of excellent adhesiveness of the adhesive composition to the substrate or chip.
- Tg is 100 ° C. or less, bumps formed on the semiconductor chip, and unevenness such as electrodes and wiring patterns formed on the substrate can be easily embedded with the adhesive composition, and no voids remain without voids. Tends to be less likely to occur.
- the Tg is a Tg measured using a DSC (DSC-7 model manufactured by Perkin Elmer) under the conditions of a sample amount of 10 mg, a heating rate of 10 ° C./min, and a measurement atmosphere: air.
- the weight average molecular weight of the component (d) is 10000 or more in terms of polystyrene, but preferably 30000 or more, more preferably 40000 or more, and even more preferably 50000 or more in order to exhibit good film formability alone.
- the weight average molecular weight is 10,000 or more, film formability and heat resistance tend to be improved.
- the weight average molecular weight means a weight average molecular weight when measured in terms of polystyrene using high performance liquid chromatography (for example, product name “C-R4A” manufactured by Shimadzu Corporation).
- the content of the component (d) is not particularly limited, but is preferably 1 to 500 parts by mass with respect to 100 parts by mass of the component (a), in order to maintain a good film shape, and 5 to 300 parts by mass. More preferred is 10 to 200 parts by mass.
- the content of the component (d) is 1 part by mass or more, there is a tendency that an effect of improving the film formability is easily obtained, and when it is 500 parts by mass or less, the curability of the adhesive composition is improved and the adhesive strength is increased. There is a tendency to improve.
- the adhesive composition of the present invention can contain a component (e), that is, a flux activator that is a compound exhibiting flux activity (activity for removing oxides and impurities).
- a flux activator that is a compound exhibiting flux activity (activity for removing oxides and impurities).
- the flux activator include nitrogen-containing compounds having lone pairs such as imidazoles and amines, carboxylic acids, phenols, and alcohols.
- carboxylic acids have a strong flux activity and react with the epoxy resin as the component (a) and are not present in a free state in the cured product of the adhesive composition, thereby preventing a decrease in insulation reliability. it can.
- carboxylic acids examples include ethanoic acid, propanoic acid, butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid and the like.
- Fatty saturated carboxylic acids Fatty saturated carboxylic acids; oleic acid, linoleic acid, linolenic acid, arachidonic acid, docosahesaenoic acid, eicosapentaenoic acid, etc .; aliphatic unsaturated carboxylic acids; maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid Aliphatic dicarboxylic acids such as adipic acid; fragrances such as benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, trimesic acid, hemimellitic acid, pyromellitic acid, pentanecarboxylic acid, melittic acid Group carboxylic acids.
- Examples of the carboxylic acid having a hydroxyl group include lactic acid, malic acid, citric acid, and salicylic acid.
- the aromatic carboxylic acid has an electron-withdrawing or electron-donating substituent
- an aromatic carboxylic acid in which the acidity of the carboxylic acid on the aromatic is changed by the substituent can also be used.
- the flux activity tends to improve as the acidity of the carboxylic acid increases, the insulation reliability may decrease if the acidity is too high.
- the electron-withdrawing substituent that increases the acidity of the carboxylic acid include a nitro group, a cyano group, a trifluoromethyl group, a halogen group, and a phenyl group.
- Examples of the electron-donating substituent that weakens the acidity of the carboxylic acid include a methyl group, an ethyl group, an isopropyl group, a tertiary butyl group, a dimethylamino group, and a trimethylamino group.
- the number and position of the substituents are not particularly limited as long as the flux activity and the insulation reliability are not lowered.
- a filler may be further blended.
- an insulating inorganic filler, whisker or resin filler can be used as the filler.
- the insulating inorganic filler, whisker, or resin filler the same material as the component (c) can be used.
- These fillers, whiskers, and resin fillers can be used alone or as a mixture of two or more.
- the shape, average particle diameter and content of the filler are not particularly limited.
- additives such as an antioxidant, a silane coupling agent, a titanium coupling agent, a leveling agent, and an ion trap agent may be blended in the adhesive composition of the present embodiment. You may use these individually by 1 type or in combination of 2 or more types. About these compounding quantities, what is necessary is just to adjust suitably so that the effect of each additive may express.
- the adhesive composition of this embodiment can be formed into a film.
- a method for producing a film adhesive using the adhesive composition of the present embodiment is shown below. First, the component (a), the component (b) and the component (c), and the component (d) or the component (e) added as necessary are added to an organic solvent, and mixed by stirring, kneading, etc. A resin varnish is prepared by dissolving or dispersing. Then, after applying the resin varnish on the base film subjected to the release treatment using a knife coater, roll coater or applicator, the organic solvent is removed by heating, whereby a film adhesive is applied on the base film. Is obtained.
- organic solvent used for preparing the resin varnish those having characteristics capable of uniformly dissolving or dispersing each component are preferable.
- dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, dimethyl sulfoxide, diethylene glycol dimethyl ether examples include toluene, benzene, xylene, methyl ethyl ketone, tetrahydrofuran, ethyl cellosolve, ethyl cellosolve acetate, butyl cellosolve, dioxane, cyclohexanone, and ethyl acetate.
- These organic solvents can be used alone or in combination of two or more.
- Stir mixing and kneading at the time of preparing the resin varnish can be performed using, for example, a stirrer, a raking machine, a three roll, a ball mill, a bead mill, and a homodisper.
- the substrate film is not particularly limited as long as it has heat resistance that can withstand the heating conditions when the organic solvent is volatilized.
- Polyolefin films such as polypropylene film and polymethylpentene film, polyethylene terephthalate film, polyethylene naphthalate Examples thereof include polyester films such as phthalate films, polyimide films, and polyetherimide films.
- the base film is not limited to a single layer made of these films, and may be a multilayer film made of two or more materials.
- the drying conditions when the organic solvent is volatilized from the resin varnish applied to the base film is preferably set so that the organic solvent is sufficiently volatilized, specifically, 50 to 200 ° C. for 0.1 to 90 minutes. It is preferable to perform heating.
- the adhesive composition of the present embodiment can also be used by spin-coating directly on a wafer and drying it if necessary after separating the wafer from the viewpoint of improving workability.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of a semiconductor device of the present invention.
- a semiconductor device 100 includes a semiconductor chip 10 and a substrate (circuit wiring board) 20 that face each other, and wirings 15 that are respectively disposed on mutually facing surfaces of the semiconductor chip 10 and the substrate 20.
- the connection bump 30 connects the semiconductor chip 10 and the wiring 15 of the substrate 20 to each other, and the adhesive composition 40 is filled in the gap between the semiconductor chip 10 and the substrate 20 without a gap.
- the semiconductor chip 10 and the substrate 20 are flip-chip connected by wiring 15 and connection bumps 30.
- the wiring 15 and the connection bump 30 are sealed with an adhesive composition 40 and are shielded from the external environment.
- the semiconductor device 200 includes a semiconductor chip 10 and a substrate 20 that face each other, a bump 32 that is disposed on a surface that faces the semiconductor chip 10 and the substrate 20, respectively, And an adhesive composition 40 filled in the gaps between the substrates 20 without any gaps.
- the semiconductor chip 10 and the substrate 20 are flip-chip connected by connecting opposing bumps 32 to each other.
- the bumps 32 are sealed with the adhesive composition 40 and are blocked from the external environment.
- FIG. 2 is a schematic cross-sectional view showing another embodiment of the semiconductor device of the present invention.
- the semiconductor device 300 is the same as the semiconductor device 100 except that two semiconductor chips 10 are flip-chip connected by wirings 15 and connection bumps 30.
- the semiconductor device 400 is the same as the semiconductor device 200 except that the two semiconductor chips 10 are flip-chip connected by the bumps 32.
- the semiconductor chip 10 is not particularly limited, and an elemental semiconductor composed of the same kind of element such as silicon or germanium, or a compound semiconductor such as gallium arsenide or indium phosphide can be used.
- the substrate 20 is not particularly limited as long as it is a circuit board, and an unnecessary portion of a metal film is etched on the surface of an insulating substrate mainly composed of glass epoxy, polyimide, polyester, ceramic, epoxy, bismaleimide triazine, or the like.
- Connections such as wiring 15 and bumps 32 are mainly composed of gold, silver, copper, and solder (main components are, for example, tin-silver, tin-lead, tin-bismuth, tin-copper, tin-silver-copper). Nickel, tin, lead, etc., and may contain a plurality of metals.
- gold, silver, and copper are preferable, and silver and copper are more preferable from the viewpoint of providing a package with excellent electrical and thermal conductivity of the connection portion.
- silver, copper, and solder are preferable, copper and solder are more preferable, and solder is more preferable, based on being inexpensive. If an oxide film is formed on the surface of a metal at room temperature, the productivity may decrease or the cost may increase. From the viewpoint of suppressing the formation of the oxide film, gold, silver, copper and solder are preferable, and gold, silver Solder is more preferable, and gold and silver are more preferable.
- the surface of the wiring 15 and the bump 32 is mainly composed of gold, silver, copper, solder (main components are, for example, tin-silver, tin-lead, tin-bismuth, tin-copper), tin, nickel, etc.
- the metal layer may be formed by plating, for example. This metal layer may be composed of only a single component or may be composed of a plurality of components.
- the metal layer may have a structure in which a single layer or a plurality of metal layers are stacked.
- the semiconductor device of this embodiment may be formed by stacking a plurality of structures (packages) as shown in the semiconductor devices 100 to 400.
- the semiconductor devices 100 to 400 include gold, silver, copper, solder (main components are, for example, tin-silver, tin-lead, tin-bismuth, tin-copper, tin-silver-copper), tin, nickel, etc. May be electrically connected to each other by a bump or wiring including
- FIG. 3 is a schematic cross-sectional view showing another embodiment of the semiconductor device of the present invention, which is a semiconductor device using the TSV technology.
- the wiring 15 formed on the interposer 50 is connected to the wiring 15 of the semiconductor chip 10 via the connection bumps 30, so that the semiconductor chip 10 and the interposer 50 are flip-chip connected. ing.
- the gap between the semiconductor chip 10 and the interposer 50 is filled with the adhesive composition 40 without a gap.
- the semiconductor chip 10 On the surface of the semiconductor chip 10 opposite to the interposer 50, the semiconductor chip 10 is repeatedly stacked via the wiring 15, the connection bumps 30, and the adhesive composition 40.
- the wirings 15 on the pattern surface on the front and back sides of the semiconductor chip 10 are connected to each other by through electrodes 34 filled in holes that penetrate the inside of the semiconductor chip 10.
- the penetration electrode 34 copper, aluminum, etc. can be used as a material of the penetration electrode 34.
- Such a TSV technology makes it possible to acquire a signal from the back surface of a semiconductor chip that is not normally used. Furthermore, since the through electrode 34 passes vertically through the semiconductor chip 10, the distance between the semiconductor chips 10 facing each other and between the semiconductor chip 10 and the interposer 50 can be shortened and flexible connection is possible.
- the adhesive composition of the present embodiment can be applied as an adhesive for semiconductor sealing between the semiconductor chips 10 facing each other or between the semiconductor chip 10 and the interposer 50 in such TSV technology.
- a semiconductor chip can be directly mounted on a motherboard without using an interposer.
- the adhesive composition of this embodiment can also be applied when such a semiconductor chip is directly mounted on a mother board.
- the adhesive composition of this embodiment can be applied also when sealing the space
- FIG. 4 is a process cross-sectional view schematically showing one embodiment of a method for manufacturing a semiconductor device of the present invention.
- solder resist 60 having openings at positions where connection bumps 30 are formed is formed on a substrate 20 having wirings 15.
- the solder resist 60 is not necessarily provided. However, by providing a solder resist on the substrate 20, it is possible to suppress the occurrence of a bridge between the wirings 15 and improve the connection reliability and insulation reliability.
- the solder resist 60 can be formed using, for example, commercially available solder resist ink for packages. Specific examples of commercially available solder resist ink for packaging include SR series (trade name, manufactured by Hitachi Chemical Co., Ltd.) and PSR4000-AUS series (trade name, manufactured by Taiyo Ink Manufacturing Co., Ltd.).
- connection bumps 30 are formed in the openings of the solder resist 60.
- a film-like adhesive composition hereinafter sometimes referred to as “film-like adhesive” 40 is formed on the substrate 20 on which the connection bumps 30 and the solder resist 60 are formed.
- the film adhesive 40 can be attached by a hot press, roll lamination, vacuum lamination, or the like. The supply area and thickness of the film adhesive 40 are appropriately set according to the size of the semiconductor chip 10 and the substrate 20 and the height of the connection bump 30.
- the wiring 15 and the connection bumps 30 of the semiconductor chip 10 are aligned using a connection device such as a flip chip bonder. Subsequently, the semiconductor chip 10 and the substrate 20 are pressure-bonded while being heated at a temperature equal to or higher than the melting point of the connection bump 30 to connect the semiconductor chip 10 and the substrate 20 as shown in FIG. The gap between the semiconductor chip 10 and the substrate 20 is sealed and filled with the adhesive 40. Thus, the semiconductor device 600 is obtained.
- the semiconductor device is temporarily fixed (in a state where the semiconductor adhesive is interposed), and heat-treated in a reflow furnace, thereby melting the connection bumps 30 and the semiconductor chip 10.
- the substrate 20 may be connected. Since it is not always necessary to form a metal joint at the temporary fixing stage, it can be crimped with a low load, in a short time, and at a low temperature as compared with the above-mentioned method of crimping while heating. Deterioration of the part can be suppressed.
- the heating temperature is preferably a temperature at which curing of the film adhesive proceeds, and more preferably a temperature at which the film adhesive is completely cured.
- the heating temperature and the heating time are appropriately set.
- the substrate 20 may be connected after the film adhesive 40 is attached to the semiconductor chip 10. Further, after the semiconductor chip 10 and the substrate 20 are connected by the wiring 15 and the connection bumps 30, the gap between the semiconductor chip 10 and the substrate 20 may be filled with a paste-like adhesive composition.
- the adhesive composition is supplied onto the semiconductor chip 10 by supplying the adhesive composition to a semiconductor wafer connected with a plurality of semiconductor chips 10 and then dicing into individual pieces.
- the obtained structure may be obtained.
- the adhesive composition is in a paste form, it is not particularly limited, but it is sufficient to embed wirings and bumps on the semiconductor chip 10 and make the thickness uniform by a coating method such as spin coating. In this case, since the supply amount of the resin becomes constant, productivity is improved and generation of voids due to insufficient embedding and a decrease in dicing property can be suppressed.
- the adhesive composition is in the form of a film, it is not particularly limited.
- the adhesive composition is in a film form so as to embed wirings and bumps on the semiconductor chip 10 by a sticking method such as heating press, roll lamination, and vacuum lamination. What is necessary is just to supply a resin composition. In this case, since the supply amount of the resin is constant, productivity is improved, and generation of voids due to insufficient embedding and a decrease in dicing property can be suppressed.
- connection load is set in consideration of variations in the number and height of the connection bumps 30, the amount of deformation of the wiring that receives the connection bumps 30 due to pressurization, or the bumps of the connection portions.
- the connection temperature is preferably such that the temperature of the connection portion is equal to or higher than the melting point of the connection bump 30, but may be any temperature at which metal connection of each connection portion (bump or wiring) is formed.
- the connection bump 30 is a solder bump, about 240 ° C. or higher is preferable.
- connection time at the time of connection varies depending on the constituent metal of the connection part, but a shorter time is preferable from the viewpoint of improving productivity.
- connection time is preferably 20 seconds or less, more preferably 10 seconds or less, and even more preferably 5 seconds or less.
- connection time is preferably 60 seconds or less.
- the adhesive composition of the present invention exhibits excellent reflow resistance, connection reliability, and insulation reliability even in flip chip connection portions having various package structures described above.
- Polyimide A A solvent (NMP) was removed from the obtained polyimide resin, and a solution obtained by dissolving in methyl ethyl ketone (MEK) so as to have a solid content of 50% by mass was designated as “polyimide A”.
- Polyimide A had a Tg of 30 ° C., a weight average molecular weight of 50,000, and an SP value (solubility parameter) of 10.2.
- Example 1 100 parts by weight of epoxy resin (EP1032), 7.5 parts by weight of curing agent (2PHZ), 175 parts by weight of filler (SM silica), 25 parts by weight of flux activator (diphenolic acid), and MEK solvent with a solid content of 60% by weight Add the same amount of beads with a diameter of 0.8 mm and beads with a diameter of 2.0 mm as the solid content, and stir for 30 minutes in a bead mill (Fritch Japan Co., Ltd., planetary pulverizer “P-7”). did. Next, 100 parts by mass (in terms of solid content) of polyimide A was added, and the mixture was again stirred for 30 minutes with a bead mill. Then, the beads used for stirring were removed by filtration to obtain a resin varnish.
- the resulting resin varnish was applied to a base film (trade name “Purex A53” manufactured by Teijin DuPont Films Ltd.) with a small precision coating device (manufactured by Yanai Seiki Co., Ltd.) Manufactured) and dried at 70 ° C. for 10 minutes to produce a film adhesive.
- a base film trade name “Purex A53” manufactured by Teijin DuPont Films Ltd.
- a small precision coating device manufactured by Yanai Seiki Co., Ltd.
- Example 2 to 3 and Comparative Examples 1 to 6 Except that the composition of the raw materials used was changed as shown in Table 1 below, film-like adhesives of Examples 2 to 3 and Comparative Examples 1 to 6 were produced in the same manner as Example 1.
- the film adhesive was cut into a predetermined size (length 37 mm ⁇ width 4 mm ⁇ thickness 0.13 mm), and cured in a clean oven (manufactured by ESPEC Corporation) at 180 ° C. for 3 hours.
- the elastic modulus at 260 ° C. which is the ultimate temperature of the reflow furnace at the time of evaluation of the reflow resistance, was measured using a viscoelasticity measuring device (trade name “RASII” manufactured by Rheometrics). The measurement was performed at a temperature range of ⁇ 30 to 270 ° C., a temperature increase rate of 5 ° C./min, and a measurement wavelength of 10 Hz.
- a film adhesive is cut out to a predetermined size (length 5 mm x width 5 mm x thickness 0.025 mm) and attached to a silicon chip (length 5 mm x width 5 mm x thickness 0.725 mm, oxide film coating) at 60 ° C.
- the produced film adhesive is cut out to a predetermined size (length 8 mm ⁇ width 8 mm ⁇ thickness 0.025 mm) and placed on a glass epoxy substrate (glass epoxy substrate: 420 ⁇ m thickness, copper wiring: 9 ⁇ m thickness, 80 ⁇ m pitch).
- Affixed semiconductor chip with solder bumps chip size: length 7mm x width 7mm x height 0.15mm, bump: copper pillar and solder, 80 ⁇ m pitch
- flip chip mounting device "FCB3" product name, manufactured by Panasonic
- connection resistance value of the obtained semiconductor device was measured using a multimeter (trade name “R6871E” manufactured by ADVANTEST) to evaluate whether initial conduction after mounting was possible.
- the case where the connection resistance value was 11 to 14 ⁇ was evaluated as “A”, and the connection resistance value other than that or the case where the connection value (Open) occurred and the resistance value was not displayed was evaluated as “B”. .
- the above-described semiconductor device is molded into a predetermined shape using a sealing material (trade name “CEL9700HF10K” manufactured by Hitachi Chemical Co., Ltd.) under the conditions of 180 ° C., 6.75 MPa, and 90 seconds.
- the product was cured at 175 ° C. for 5 hours to obtain a package.
- the package was passed through an IR reflow oven (manufactured by FURUKAWA ELECTRIC, trade name “SALAMANDER”) after high-temperature moisture absorption under JEDEC level 2 conditions.
- the connectivity of the package after the reflow was evaluated by the same method as the evaluation of the initial connectivity described later, and the reflow resistance was evaluated. The case where there was no separation and the connection was good was designated as “A”, and the case where the separation or connection failure occurred and the resistance value was not displayed was designated as “B”.
- connection reliability (TCT resistance evaluation)>
- the above-described semiconductor device is molded into a predetermined shape using a sealing material (trade name “CEL9700HF10K” manufactured by Hitachi Chemical Co., Ltd.) under the conditions of 180 ° C., 6.75 MPa, and 90 seconds.
- the product was cured at 175 ° C. for 5 hours to obtain a package.
- this package is left in a thermal cycle tester (manufactured by ETAC, THERMAL SHOCK CHAMBER NT1200), a current of 1 mA is applied, and 25 ° C. 2 minutes / ⁇ 55 ° C. 15 minutes / 25 ° C. 2 minutes / 125 ° C.
- connection resistance was measured by setting one minute at 25 ° C. for 2 minutes, and the change in the connection resistance after 1000 cycles was evaluated. The case where there was no significant change after 1000 cycles compared to the initial resistance value waveform was designated as “A”, and the case where a difference of 1 ⁇ or more occurred was designated as “B”.
- the produced film adhesive was cut out to a predetermined size (length 10 mm ⁇ width 5 mm ⁇ thickness 25 ⁇ m) and attached to a comb-type electrode substrate (wiring pitch: 0.05 mm) in which wiring copper wiring was formed on a polyimide substrate, As shown in FIG. 5, a sample in which the film adhesive 40 was laminated on the substrate 20 on which the comb-shaped electrode 90 was formed was produced. In FIG. 5, the film adhesive is not shown for convenience. Subsequently, the sample was cured by being held at 185 ° C. for 3 hours in a clean oven (manufactured by ESPEC Corporation).
- each sample was taken out and placed in an accelerated life test apparatus (trade name “PL-422R8”, manufactured by HIRAYAMA, condition: 130 ° C./85% relative humidity / 200 hours / 5 V applied), and the insulation resistance was measured. . Throughout 200 hours, the case where the insulation resistance was 10 8 ⁇ or more was evaluated as “A”, and the case where it was less than 10 8 ⁇ was evaluated as “B”.
- Table 1 shows the composition (unit: parts by mass) of the raw materials of the adhesive compositions of Examples and Comparative Examples, and Table 2 shows the results of each test.
- Examples 1 to 3 using the acrylic surface treatment filler had high adhesive strength at 260 ° C. after moisture absorption, and were excellent in all the characteristics of reflow resistance, TCT resistance and HAST resistance. .
- SYMBOLS 10 Semiconductor chip, 15 ... Wiring (connection part), 20 ... Board
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Abstract
Description
本実施形態の接着剤組成物(半導体封止用接着剤)は、半導体チップ及び配線回路基板(以下、場合により単に「基板」という。)のそれぞれ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接続部を封止する接着剤組成物であって、エポキシ樹脂(以下、場合により「(a)成分」という。)と、硬化剤(以下、場合により「(b)成分」という。)と、アクリル系表面処理フィラー又は上記一般式(1)で表される基を有するフィラー(以下、場合により「(c)成分」という。)とを含有する。また、接着剤組成物は、必要に応じて、重量平均分子量10000以上の高分子成分(以下、場合により「(d)成分」という。)又はフラックス活性剤(以下、場合により「(e)成分」という。)を含有する。以下、本実施形態の接着剤組成物を構成する各成分について説明する。
エポキシ樹脂としては、分子内に2個以上のエポキシ基を有するものであれば特に制限なく用いることができる。(a)成分として、具体的には、ビスフェノールA型、ビスフェノールF型、ナフタレン型、フェノールノボラック型、クレゾールノボラック型、フェノールアラルキル型、ビフェニル型、トリフェニルメタン型、ジシクロペンタジエン型及び各種多官能エポキシ樹脂を使用することができる。これらは単独で又は2種以上の混合物として使用することができる。
(b)成分としては、例えば、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、イミダゾール系硬化剤及びホスフィン系硬化剤が挙げられる。(b)成分がフェノール性水酸基、酸無水物、アミン類又はイミダゾール類を含むと、接続部に酸化膜が生じることを抑制するフラックス活性を示し、接続信頼性・絶縁信頼性を向上させることができる。以下、各硬化剤について説明する。
フェノール樹脂系硬化剤としては、分子内に2個以上のフェノール性水酸基を有するものであれば特に制限はなく、例えば、フェノールノボラック、クレゾールノボラック、フェノールアラルキル樹脂、クレゾールナフトールホルムアルデヒド重縮合物、トリフェニルメタン型多官能フェノール及び各種多官能フェノール樹脂を使用することができる。これらは単独で又は2種以上の混合物として使用することができる。
酸無水物系硬化剤としては、例えば、メチルシクロヘキサンテトラカルボン酸二無水物、無水トリメリット酸、無水ピロメリット酸、ベンゾフェノンテトラカルボン酸二無水物及びエチレングリコールビスアンヒドロトリメリテートを使用することができる。これらは単独で又は2種以上の混合物として使用することができる。
アミン系硬化剤としては、例えばジシアンジアミドを使用することができる。
イミダゾール系硬化剤としては、例えば、2-フェニルイミダゾール、2-フェニル-4-メチルイミダゾール、1-ベンジル-2-メチルイミダゾール、1-ベンジル-2-フェニルイミダゾール、1-シアノエチル-2-ウンデシルイミダゾール、1-シアノ-2-フェニルイミダゾール、1-シアノエチル-2-ウンデシルイミダゾールトリメリテイト、1-シアノエチル-2-フェニルイミダゾリウムトリメリテイト、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、2,4-ジアミノ-6-[2’-ウンデシルイミダゾリル-(1’)]-エチル-s-トリアジン、2,4-ジアミノ-6-[2’-エチル-4’-メチルイミダゾリル-(1’)]-エチル-s-トリアジン、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、2-フェニルイミダゾールイソシアヌル酸付加体、2-フェニル-4,5-ジヒドロキシメチルイミダゾール、2-フェニル-4-メチル-5-ヒドロキシメチルイミダゾール、及び、エポキシ樹脂とイミダゾール類の付加体が挙げられる。これらの中でも、優れた硬化性、保存安定性及び接続信頼性の観点から、1-シアノエチル-2-ウンデシルイミダゾール、1-シアノ-2-フェニルイミダゾール、1-シアノエチル-2-ウンデシルイミダゾールトリメリテイト、1-シアノエチル-2-フェニルイミダゾリウムトリメリテイト、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、2,4-ジアミノ-6-[2’-エチル-4’-メチルイミダゾリル-(1’)]-エチル-s-トリアジン、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、2-フェニルイミダゾールイソシアヌル酸付加体、2-フェニル-4,5-ジヒドロキシメチルイミダゾール及び2-フェニル-4-メチル-5-ヒドロキシメチルイミダゾールが好ましい。これらは単独で又は2種以上を併用して用いることができる。また、これらをマイクロカプセル化した潜在性硬化剤としてもよい。
ホスフィン系硬化剤としては、例えば、トリフェニルホスフィン、テトラフェニルホスホニウムテトラフェニルボレート、テトラフェニルホスホニウムテトラ(4-メチルフェニル)ボレート及びテトラフェニルホスホニウム(4-フルオロフェニル)ボレートが挙げられる。
(c)成分としては、上記一般式(1)で表される基を有する化合物で表面処理されたフィラーであれば特に制限はなく、例えば絶縁性無機フィラー、ウィスカー及び樹脂フィラーを表面処理したものを用いることができる。すなわち、(c)成分としては、上記一般式(1)で表される基を有するフィラーを用いることができる。
(d)成分としては、例えば、フェノキシ樹脂、ポリイミド樹脂、ポリアミド樹脂、ポリカルボジイミド樹脂、シアネートエステル樹脂、アクリル樹脂、ポリエステル樹脂、ポリエチレン樹脂、ポリエーテルスルホン樹脂、ポリエーテルイミド樹脂、ポリビニルアセタール樹脂、ウレタン樹脂及びアクリルゴムが挙げられる。これらの中でも耐熱性及びフィルム形成性に優れる観点から、フェノキシ樹脂、ポリイミド樹脂、アクリルゴム、シアネートエステル樹脂及びポリカルボジイミド樹脂が好ましく、フェノキシ樹脂、ポリイミド樹脂及びアクリルゴムがより好ましい。これらの(d)成分は単独で又は2種以上の混合物や共重合体として使用することもできる。但し、(d)成分には、(a)成分であるエポキシ樹脂が含まれない。
本発明の接着剤組成物には(e)成分、すなわち、フラックス活性(酸化物や不純物を除去する活性)を示す化合物であるフラックス活性剤を含有することができる。フラックス活性剤としては、イミダゾール類やアミン類のように非共有電子対を有する含窒素化合物、カルボン酸類、フェノール類及びアルコール類が挙げられる。
本実施形態の接着剤組成物には、粘度や硬化物の物性を制御するため、及び、半導体チップ及び基板を接続した際のボイドの発生や吸湿率の上昇を抑制するために、(c)成分の他に更にフィラーを配合してもよい。
本実施形態の半導体装置について、図1及び2を用いて以下説明する。図1は、本発明の半導体装置の一実施形態を示す模式断面図である。図1(a)に示すように、半導体装置100は、互いに対向する半導体チップ10及び基板(回路配線基板)20と、半導体チップ10及び基板20の互いに対向する面にそれぞれ配置された配線15と、半導体チップ10及び基板20の配線15を互いに接続する接続バンプ30と、半導体チップ10及び基板20間の空隙に隙間なく充填された接着剤組成物40とを有している。半導体チップ10及び基板20は、配線15及び接続バンプ30によりフリップチップ接続されている。配線15及び接続バンプ30は、接着剤組成物40により封止されており外部環境から遮断されている。
本実施形態の半導体装置の製造方法について、図4を用いて以下説明する。図4は、本発明の半導体装置の製造方法の一実施形態を模式的に示す工程断面図である。
温度計、攪拌機及び塩化カルシウム管を備えた300mLフラスコに、1,12-ジアミノドデカン2.10g(0.035モル)、ポリエーテルジアミン(BASF製、商品名「ED2000」、分子量:1923)17.31g(0.03モル)、1,3-ビス(3-アミノプロピル)テトラメチルジシロキサン(信越化学製、商品名「LP-7100」)2.61g(0.035モル)及びN-メチル-2-ピロリドン(関東化学製、以下「NMP」という)150gを仕込み攪拌した。上記ジアミンの溶解後、フラスコを氷浴中で冷却しながら、無水酢酸で再結晶精製した4,4’-(4,4’-イソプロピリデンジフェノキシ)ビス(フタル酸二無水物)(ALDRICH製、商品名「BPADA」)15.62g(0.10モル)を少量ずつ添加した。室温で8時間反応させたのち、キシレン100gを加え、窒素ガスを吹き込みながら180℃で加熱し、水と共にキシレンを共沸除去し、ポリイミド樹脂を得た。得られたポリイミド樹脂から溶媒(NMP)を除去し、メチルエチルケトン(MEK)に固形分50質量%となるように溶解したものを「ポリイミドA」とした。ポリイミドAのTgは30℃、重量平均分子量は50000、SP値(溶解度パラメーター)は10.2であった。
(a)エポキシ樹脂
・トリフェノールメタン骨格含有多官能固形エポキシ(ジャパンエポキシレジン株式会社製、商品名「EP1032H60」、以下「EP1032」という。)
・ビスフェノールF型液状エポキシ(ジャパンエポキシレジン株式会社製、商品名「YL983U」、以下「YL983」という。)
・柔軟性エポキシ(ジャパンエポキシレジン株式会社製、商品名「YL7175」、以下「YL7175」という。)
(b)硬化剤
・2-フェニル-4,5-ジヒドロキシメチルイミダゾール(四国化成株式会社製、商品名「2PHZ-PW」、以下「2PHZ」いう。)
・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(四国化成株式会社製、商品名「2MAOK-PW」、以下「2MAOK」という。)
(c)アクリル系表面処理フィラー又は上記一般式(1)で表される基を有するフィラー
・メタクリル表面処理シリカフィラー(株式会社アドマテックス製、商品名「SE2050-SMJ」、平均粒径0.5μm、以下「SMシリカ」という。)
・メタクリル表面処理ナノシリカフィラー(株式会社アドマテックス製、商品名「YA050C-SM」、以下「SMナノシリカ」という。)
(c’)その他のフィラー
・未処理のシリカフィラー(株式会社アドマテックス製、商品名「SE2050」、平均粒径0.5μm、以下、「未処理シリカ」という。)
・アミノシラン処理シリカフィラー(株式会社アドマテックス製、商品名「SE2050-SXJ」、平均粒径0.5μm、以下「SXシリカ」という。)
・エポキシシラン処理シリカフィラー(株式会社アドマテックス製、商品名「SE2050-SEJ」、平均粒径0.5μm、以下「SEシリカ」という。)
・フェニルシラン処理シリカフィラー(株式会社アドマテックス製、商品名「SE2050-SPJ」、平均粒径0.5μm、以下「SPシリカ」という。)
・フェニル表面処理ナノシリカフィラー(株式会社アドマテックス製、商品名「YA050C-SP」、平均粒径50nm、以下「SPナノシリカ」という。)
・有機フィラー(1)(三菱レイヨン製、商品名「W5500」、以下「W5500」という。)
・有機フィラー(2)(ロームアンドハースジャパン(株)社製、商品名「EXL-2655」、コアシェルタイプ有機微粒子、以下「EXL2655」という。)
(d)分子量10000以上の高分子成分
・フェノキシ樹脂(東都化成株式会社製、商品名「ZX1356」、Tg:約71℃、Mw:約63000、以下「ZX1356」という。)
・上述の通り合成したポリイミドA
(e)フラックス活性剤(フラックス剤)
・ジフェノール酸(東京化成株式会社製)
・アジピン酸(和光純薬工業株式会社製)
(実施例1)
エポキシ樹脂(EP1032)100質量部、硬化剤(2PHZ)7.5質量部、フィラー(SMシリカ)175質量部、フラックス活性剤(ジフェノール酸)25質量部並びにMEK溶媒を固形分が60質量%になるように仕込み、直径0.8mmのビーズ及び直径2.0mmのビーズを固形分と同量加え、ビーズミル(フリッチュ・ジャパン株式会社、遊星型微粉砕機「P-7」)で30分間撹拌した。次いで、ポリイミドAを100質量部(固形分換算)加え、再度ビーズミルで30分間撹拌した後、撹拌に用いたビーズをろ過によって除去し、樹脂ワニスを得た。
使用した原材料の組成を下記の表1の通りに変更したことを除いては、実施例1と同様にして、実施例2~3及び比較例1~6のフィルム状接着剤を作製した。
フィルム状接着剤を所定のサイズ(縦37mm×横4mm×厚さ0.13mm)に切り抜き、クリーンオーブン(エスペック株式会社製)中、180℃で3時間保持して硬化した。硬化後、粘弾性測定装置(Rheometrics製、商品名「RASII」)を用いて、耐リフロー性の評価時のリフロー炉の到達温度である260℃における弾性率を測定した。測定は、温度範囲-30~270℃、昇温速度5℃/分、測定波長10Hzで行った。
フィルム状接着剤を所定のサイズ(縦5mm×横5mm×厚さ0.025mm)に切り抜き、シリコンチップ(縦5mm×横5mm×厚さ0.725mm、酸化膜コーティング)に60℃で貼付け、熱圧着試験機(日立化成テクノプラント株式会社製)を用いてソルダーレジスト(太陽インキ製、商品名「AUS308」)がコーティングされたガラスエポキシ基板(厚さ0.02mm)に圧着した(圧着条件:フィルム状接着剤の到達温度180℃/10秒間/0.5MPa。次いでフィルム状接着剤の到達温度245℃/10秒間/0.5MPa)。次に、クリーンオーブン(エスペック株式会社製)中でアフターキュアした(180℃/3時間)。その後、85℃、相対湿度60%の恒温恒湿器(エスペック株式会社製、商品名「PR-2KP」)に48時間放置し、取り出し後、260℃のホットプレート上で接着力測定装置(DAGE社製、万能型ボンドテスタDAGE4000型)を使い、基板からのツール高さ0.05mm、ツール速度0.05mm/秒の条件で測定した。
作製したフィルム状接着剤を所定のサイズ(縦8mm×横8mm×厚さ0.025mm)に切り抜いて、ガラスエポキシ基板(ガラスエポキシ基材:420μm厚、銅配線:9μm厚、80μmピッチ)上に貼付し、はんだバンプ付き半導体チップ(チップサイズ:縦7mm×横7mm×高さ0.15mm、バンプ:銅ピラー及びはんだ、80μmピッチ、)をフリップチップ実装装置「FCB3」(パナソニック製、商品名)で実装した(実装条件:フィルム状接着剤の到達温度180℃、10秒間、0.5MPa。次いで、フィルム状接着剤の到達温度245℃、10秒間、0.5MPa)。これにより、図4と同様に上記ガラスエポキシ基板と、はんだバンプ付き半導体チップとがデイジーチェーン接続された半導体装置を得た。
上述の半導体装置を封止材(日立化成工業株式会社製、商品名「CEL9700HF10K」)を用いて、180℃、6.75MPa、90秒間の条件で所定の形状にモールドし、クリーンオーブン(エスペック株式会社製)中、175℃で5時間硬化させてパッケージを得た。次に、このパッケージをJEDEC level 2条件で高温吸湿後、IRリフロー炉(FURUKAWA ELECTRIC製、商品名「SALAMANDER」)にパッケージを通過させた。リフロー後のパッケージの接続性を、後述の初期接続性の評価と同様の方法で評価し、耐リフロー性の評価とした。剥離がなく、接続良好な場合を「A」、剥離や接続不良が生じて抵抗値が表示されなかった場合を「B」とした。
上述の半導体装置を封止材(日立化成工業株式会社製、商品名「CEL9700HF10K」)を用いて、180℃、6.75MPa、90秒間の条件で所定の形状にモールドし、クリーンオーブン(エスペック株式会社製)中、175℃で5時間硬化させてパッケージを得た。次に、このパッケージを冷熱サイクル試験機(ETAC製、THERMAL SHOCK CHAMBER NT1200)内に放置し、1mAの電流を流し、25℃2分間/-55℃15分間/25℃2分間/125℃で15分間/25℃2分間を1サイクルとして接続抵抗を測定し、1000サイクル繰り返した後の接続抵抗の変化を評価した。初期の抵抗値波形と比べて1000サイクル後も大きな変化がなかった場合を「A」、1Ω以上の差が生じた場合を「B」とした。
作製したフィルム状接着剤を所定のサイズ(縦10mm×横5mm×厚さ25μm)に切り抜き、ポリイミド基板上に配線銅配線を形成した、くし型電極基板(配線ピッチ:0.05mm)に貼付け、図5に示すように、くし型電極90が形成された基板20上にフィルム状接着剤40が積層されたサンプルを作製した。なお、図5では、便宜上フィルム状接着剤の図示を省略した。続いて、サンプルをクリーンオーブン(エスペック株式会社製)中、185℃で3時間保持して硬化した。硬化後、各サンプルを取り出し、加速寿命試験装置(HIRAYAMA社製、商品名「PL-422R8」、条件:130℃/相対湿度85%/200時間/5V印加)に設置し、絶縁抵抗を測定した。200時間を通して、絶縁抵抗が108Ω以上である場合を「A」、108Ω未満である場合を「B」として評価した。
Claims (10)
- 重量平均分子量が10000以上の高分子成分を更に含有する、請求項1~3のいずれか一項に記載の接着剤組成物。
- 前記高分子成分の重量平均分子量が30000以上であり、ガラス転移温度が100℃以下である、請求項4に記載の接着剤組成物。
- フラックス活性剤を更に含有する、請求項1~5のいずれか一項に記載の接着剤組成物。
- 形状がフィルム状である、請求項1~6のいずれか一項に記載の接着剤組成物。
- 半導体チップ及び配線回路基板のそれぞれ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接続部が互いに電気的に接続された半導体装置の製造方法であって、
前記接続部を、請求項1~7のいずれか一項に記載の接着剤組成物を用いて封止する工程を備える、半導体装置の製造方法。 - 前記接続部が主成分として金、銀、銅、ニッケル、スズ及び鉛からなる群より選ばれる少なくとも一種の金属を含有する、請求項8記載の製造方法。
- 請求項8又は9に記載の製造方法によって得られる、半導体装置。
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| KR101728203B1 (ko) | 2017-04-18 |
| CN103642441B (zh) | 2015-05-13 |
| KR101455951B1 (ko) | 2014-10-28 |
| KR20130143667A (ko) | 2013-12-31 |
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| KR20130133762A (ko) | 2013-12-09 |
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| JP2012149266A (ja) | 2012-08-09 |
| JPWO2012043764A1 (ja) | 2014-02-24 |
| TWI424038B (zh) | 2014-01-21 |
| TW201414795A (zh) | 2014-04-16 |
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