WO2006103962A1 - 半導体装置、並びにバッファーコート用樹脂組成物、ダイボンド用樹脂組成物、及び封止用樹脂組成物 - Google Patents
半導体装置、並びにバッファーコート用樹脂組成物、ダイボンド用樹脂組成物、及び封止用樹脂組成物 Download PDFInfo
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/02—Polycondensates containing more than one epoxy group per molecule
- C08G59/027—Polycondensates containing more than one epoxy group per molecule obtained by epoxidation of unsaturated precursor, e.g. polymer or monomer
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
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Definitions
- the present invention relates to a semiconductor device excellent in solder reflow resistance (hereinafter also referred to as "package"), and also used as a buffer coat resinous yarn composition (hereinafter referred to as “battery”).
- Fur coat material a resin composition for semiconductor die bonding (hereinafter also referred to as“ die bond material ”), and a resin composition for semiconductor sealing (hereinafter also referred to as“ sealing material ”).
- die bond material a resin composition for semiconductor die bonding
- sealing material a resin composition for semiconductor sealing
- lead-free solder without using lead has been increasing for mounting semiconductor devices on boards.
- lead-free solder must be mounted at a temperature higher by about 20 to 30 ° C when mounting a semiconductor device having a higher melting point than the tin-lead eutectic solder that has been used in the past.
- the mounting temperature rises, more thermal stress is applied between the components that make up the semiconductor device, and the vapor pressure rises due to the rapid evaporation of moisture in the sealing resin composition. Defects between parts and package cracks will occur.
- the low dielectric constant organic interlayer insulating film used for the most advanced semiconductors is weak and weak, and there is a problem that this layer is broken by thermal stress during mounting.
- the next effective method is to reduce the thermal stress at the interface of each member constituting the semiconductor device.
- the coefficient of thermal expansion between the members is made closer, Alternatively, it is necessary to lower the modulus of elasticity of each member in order to relieve the stress caused by the mismatch of thermal expansion coefficients between the members.
- Patent Document 1 JP 2002-145995 (pages 2-6)
- the present invention provides a semiconductor device having excellent solder reflow resistance and high reliability in surface mounting using lead-free solder, as well as a resin composition for a nofer coat, a resin composition for a die bond, and It is providing the resin composition for semiconductor sealing.
- a semiconductor element whose surface is coated with a cured product of a buffer coating resin composition is mounted on a pad of a lead frame with a cured product of a die bonding resin thread and a composition.
- a semiconductor element mounted on a pad of the lead frame is sealed with a cured product of a sealing resin composition
- the elastic modulus at 25 ° C of the cured product of the resin composition for buffer coat is 0.5 GPa or more, 2. OGPa or less,
- the elastic modulus at 260 ° C of the cured product of the resin composition for die bonding is IMPa or more and 12 OMPa or less
- the cured product of the sealing resin composition has an elastic modulus at 260 ° C of OOMPa or more and 120 OMPa or less, and the cured product has a thermal expansion coefficient at 260 ° C of 20 ppm or more and 50 ppm or less, and the sealing
- the product of the elastic modulus at 260 ° C of the cured product of the resin composition for heat and the thermal expansion coefficient at 260 ° C of the cured product is 8,000 or more and 45,000 or less.
- the resin composition for buffer coat of the present invention comprises a semiconductor element whose surface is coated with a cured product of a resin composition for buffer coat, mounted on a lead frame pad with a cured product of a resin composition for die bonding, A resin composition used for a semiconductor device in which a semiconductor element mounted on a pad of the lead frame is sealed with a cured product of a resin composition for sealing, The cured product has a modulus of elasticity at 25 ° C of 0.5 GPa or more and 2. OGPa or less.
- the resin composition for die bonding of the present invention comprises mounting a semiconductor element whose surface is coated with a cured product of a resin composition for buffer coating on a pad of a lead frame with a cured product of the resin composition for die bonding,
- the cured product has a modulus of elasticity at 260 ° C of IMPa or more and 120MPa or less.
- a semiconductor element whose surface is coated with a cured product of a buffer coating resin composition is mounted on a lead frame pad with a cured product of a die bonding resin composition
- thermal expansion coefficient at 260 ° C is 20ppm or more and 50ppm or less
- the modulus of the cured product at 260 ° C and the thermal expansion coefficient of the cured product at 260 ° C The product of is 8,000 or more and 45,000 or less.
- the resin composition for buffer coat, the resin composition for die bonding, and the resin composition for sealing of the present invention are cured as described above, and thus have physical properties such as elastic modulus in the above range. You can get things.
- a semiconductor device having excellent solder reflow resistance and high reliability in mounting using lead-free solder can be provided, and further, a resin for a coater coat that can be used for this.
- a composition, a resin composition for die bonding, and a resin composition for sealing can be provided.
- a semiconductor device obtained by the present invention has a cured resin composition for a noffer coat, a cured resin composition for a die bond, and a sealed resin composition having a predetermined elastic modulus and the like. Therefore, it has excellent solder reflow resistance and high reliability in mounting using lead-free solder.
- FIG. 1 is a schematic cross-sectional view of a semiconductor device of the present invention.
- the semiconductor device of the present invention comprises a hardened resin composition for die-bonding of a semiconductor element whose surface is coated with a cured product of a resin composition for buffer coat (hereinafter also referred to as “buffer-one coat film”). And a semiconductor element mounted on the lead frame pad (hereinafter referred to as “die bond material cured product”). (Also referred to as “sealed material of sealing material”).
- a semiconductor device of the present invention will be described with reference to the drawings.
- the semiconductor device of the present invention is not limited to the configuration shown in FIG.
- the semiconductor device 10 includes, for example, a semiconductor element 18 mounted on a pad 13 of a lead frame 12 via a die bond material cured product 16.
- a multilayer integrated circuit is formed inside the semiconductor element 18, and a passivation film 24 for protecting the circuit and a buffer coat film 26 are formed on the surface.
- An opening for connecting the bonding wire 22 is formed on the surface layer of the semiconductor element 18, and the bonding pad 20 is exposed at the bottom.
- the cured die bond material 16 is in contact with the pad 13 and the back surface of the semiconductor element 18.
- the notfer coat film 26 is in contact with the sealing material hardened material 28, the passivation film 24, and the like.
- the cured encapsulant 28 is in contact with the buffer coat film 26, the passivation film 24, the semiconductor element 18, the lead frame 12, and the like.
- the elastic modulus and the like of the die bond material cured product 16, the nother coat film 26 and the encapsulating material cured product 28 are within a predetermined range, the stress caused by the mismatch of the thermal expansion coefficients between the members is alleviated. Can be mounted on lead-free solder However, a highly reliable semiconductor device can be provided.
- the resin composition constituting the nofer coat film 26, the die bond material cured product 16, and the sealing material cured product 28 will be described in detail.
- the resin composition for buffer coating used in the present invention is particularly limited as long as the elastic modulus at 25 ° C. of the cured product from which the resin composition strength is also obtained is 0.5 GPa or more and 2. OGPa or less. It is not a thing.
- the elastic modulus of the cured product can be obtained by measuring the tensile strength according to JIS K-6760 and calculating the Young's elastic modulus at 25 ° C from the obtained SS curve.
- the resin composition for the coater coat includes, for example, a cyclic olefin-based resin having an epoxy group, a photoacid generator, and, if necessary, a solvent, a sensitizer, an acid scavenger, a leveling agent, and an antioxidant. , Contains flame retardant, plasticizer, silane coupling agent, etc.
- cyclic polyolefin-based resin having an epoxy group used in the resin composition for buffer coat examples include addition (co) polymers containing a constitutional unit derived from a norbornene-type monomer represented by the general formula (1). Can be mentioned.
- each X is independently 0, CH, or (CH)
- R1 to R4 each represent hydrogen, an alkyl group, an alkenyl group, an alkyl group, an aryl group, an aryl group, an aralkyl group, an organic group containing an ester group, an organic group containing a ketone group, or an ether group. Either an organic group containing or an organic group containing an epoxy group may be used.
- Rl ⁇ R4 may be different among a plurality of structural units, but at least one of Rl to R4 of all the structural units is an organic group containing an epoxy group.
- the organic group containing an epoxy group is preferably a glycidyl ether group.
- the content of the structural unit represented by the general formula (1) in the (co) polymer is crosslinked by exposure. Therefore, it is possible to determine the viewpoint power that a crosslinking density that can withstand the developer is obtained.
- the content of the structural unit represented by the general formula (1) is 5 mol% or more and 95 mol% or less, preferably 20 mol% or more and 80 mol% or less, more preferably in the polymer. Is used in a proportion of 30 mol% or more and 70 mol% or less.
- photoacid generator used in the above-mentioned rosin composition for buffer coat.
- the photoacid generator crosslinks the epoxy group and improves adhesion with the substrate by subsequent curing.
- Preferred photoacid generators are onium salts, halogen compounds, sulfates and mixtures thereof.
- the cation side of onium salt includes diazonium, ammonia, jordanum, sulfome, phosphorum, alsoum, oxoum cation, etc.
- the counter-on include, but are not limited to, boric acid, alcoholic acid, phosphoric acid, antimonic acid, sulfate, carboxylic acid and salts thereof.
- photoacid generator salts include triphenylsulfurium tetrafluoroborate, triphenylsulfohexafluoroborate, and triphenylsulfotetrafluoroarsenate. , Triphenylsulfur tetrafluorophosphate, triphenylsulfur tetrafluorosulfate, 4-thiophenoxy diphenyl-sulfol tetrafluoroborate, 4-thiophenoxy diphene -Rusulfo-um tetrafluoroantimonate, 4-thiophenoxy diphenyl-sulfol-tetrafluoroarsenate, 4-thiophenoxy di-fluoro-sulfur tetrafluorophosphate, 4-thioenoxy diphenol- Rusulfoform tetrafluorosulfonate, 4 t butyl ferrule, sulfone form Trough Ruo Robo rate, 4 t butyl
- Halogen compounds that are photoacid generators include 2, 4, 6 tris (trichloromethyl) triazine, 2-aryl-1,4-6-bis (trichloromethyl) triazine, a, j8, a-tribromomethyl Phenylsulfone, ⁇ , — 2, 3, 5, 6 Hexachloroxylene, 2, 2 Bis (3,5-dib-mouthed 4-hydroxyphenyl) 1, 1, 1, 3, 3, 3 Hexa Fluoroxylene, 1,1,1-tris (3,5 dib-mouthed 4-hydroxyphenol) ethane and mixtures thereof.
- the sulfuric acid salts that are photoacid generators include 2-trobenzyl tosylate, 2,6 dinitrobenzyl ditosylate, 2,4-dibenzyl ditosylate, 2-trobenzyl methyl sulfonate, and 2-trobenzyl.
- the photoacid generator is preferably 4,4'-di-t-butylphenol fed triflate, 4, 4,, 4 "-tris (t-butylphenol) sulfo-mum triflate, diphenol. -Luodonium tetrakis (pentafluorophenol) borate, Triphenylsulfum fujol Feluo rhodonum tetrakis (pentafluorophenol) borate, 4, 4, 1 —Butylphenol rhododonium tetrakis (pentafluorophenyl) borate, Tris (t-butylphenyl) sulfotetrakis (pentafluorophenyl) borate, (4 methyl phenol) 4 (1-Methylethyl) phenyl-tetrakis (pentafluorophenyl) borate and mixtures thereof.
- the blending ratio of the photoacid generator in the resin composition for buffer coat used in the present invention is 0 with respect to 100 parts by weight of the cyclic olefin-based resin from the viewpoint of the crosslink density of the cured product and the adhesion to the substrate. It is 1 part by weight or more and 100 parts by weight or less, more preferably 0.1 part by weight or more and 10 parts by weight or less.
- a sensitizer can be used if necessary in order to enhance the photosensitivity.
- the sensitizer can broaden the wavelength range in which the photoacid generator can be activated, and can be added within a range that does not directly affect the crosslinking reaction of the polymer.
- Optimal sensitizers are compounds that have a maximum extinction coefficient near the light source used and can efficiently pass the absorbed energy to the photoacid generator.
- Examples of the sensitizer of the photoacid generator include cycloaromatics such as anthracene, noylene, and norylene.
- Examples of the anthracene skeleton include 2-isopropyl-9H thixanthene-9-ene, 4-isopropylpropenole 9H-thioxanthen-1-9-one, 1-clochi-4-propoxythioxanthene, phenothiazine and mixtures thereof.
- the proportion of the photoacid generator in the resin composition for the coater coat used can expand the wavelength range in which the photoacid generator can be activated and does not directly affect the crosslinking reaction of the polymer.
- the sensitizer is effective to activate the photoacid generator.
- the resolution can be improved by adding a small amount of an acid scavenger if necessary.
- the acid scavenger absorbs the acid that diffuses into the unexposed areas.
- Acid scavengers include, but are not limited to, pyridine, lutidine, phenothiazine, secondary and tertiary amines such as tri-n-propylamine and triethylamine.
- the mixing ratio of the acid scavenger is 0.01 parts by weight or more, 0.5 parts by weight with respect to 100 parts by weight of the cyclic olefin-based resin from the viewpoint of improving the resolution by absorbing the acid diffusing into the unexposed parts. It is as follows.
- additives such as a leveling agent, an antioxidant, a flame retardant, a plasticizer, and a silane coupling agent may be further added to the nofer coat resin composition used in the present invention.
- Non-reactive solvents act as carriers for polymers and additives and are removed during coating and curing.
- the reactive solvent contains reactive groups that are compatible with the curing agent added to the resin composition.
- Non-reactive solvents are hydrocarbons and aromatics. Examples include, but are not limited to, pentane and hexane hydrocarbon solvents. Aromatic solvents include benzene, toluene, xylene and mesitylene. Also useful are jetyl ether, tetrahydrofuran, anisole, acetate, esters, latatones, ketones and amides.
- Reactive solvents include cyclohexene oxide and apinene oxide such as apinene oxide, [methylenebis (4,1 phenoxymethylene)] bisoxysilane.
- Aromatic cycloethers such as 1,4-cyclohexanedimethanol dibule ethers and other cycloaliphatic bure ether compounds, and aromatics such as bis (4-buhlphenol) methane may be used alone or in combination.
- the resin composition for a coater coat used in the present invention preferably contains a cyclic olefin resin having an epoxy group, a photoacid generator, a sensitizer, and an acid scavenger.
- the content of the photoacid generator is 0.1 parts by weight or more, 100 parts by weight or less, preferably 0.1 parts by weight or more. 10 parts by weight or less,
- the content of the sensitizer is 0.1 to 10 parts by weight, preferably 0.2 to 5 parts by weight,
- the content of the acid scavenger is 0.01 parts by weight or more and 0.5 parts by weight or less. These numerical ranges can be combined as appropriate.
- the resin composition for a coater coat has the above-described composition, a cured product having a porosity at 25 ° C. of 0.5 GPa or more and 2. OGPa or less can be obtained.
- the resin solid content of the resin composition for a coater coat used in the present invention is 5% by weight or more.
- Solution viscosity is over lOcP, 25
- OOOcP or less preferably lOOcP or more, 3, OOOcP or less.
- the method for producing a resin composition for a coater coat used in the present invention is not particularly limited, and a cyclic olefin-based resin having an epoxy group, a photoacid generator, and, if necessary, a solvent, an enhancer. It can be obtained by simply mixing a sensitizer, an acid scavenger, a leveling agent, an antioxidant, a flame retardant, a plasticizer, a silane coupling agent, and the like.
- the resin composition for die bonding used in the present invention has a cured product having a modulus of elasticity at 260 ° C. of IMPa or more and 120 MPa or less.
- the form of the resin composition for die bonding is not particularly limited, and examples thereof include a resin paste or a resin film.
- the resin paste that can be used as the resin composition for die bonding of the present invention is mainly composed of thermosetting resin and filler, and the cured product has an elastic modulus at 260 ° C of IMPa or more and 120 MPa or less. It is characterized by this.
- the elastic modulus of the cured product was measured using a dynamic viscoelasticity measuring device under the conditions of temperature range: 100 ° C to 330 ° C, heating rate: 5 ° CZ min, frequency: 10Hz, at 260 ° C. Can be obtained by calculating the storage elastic modulus.
- the resin paste comprises a thermosetting resin, a curing agent, a curing accelerator, and the like, and is not particularly limited, but is a material that forms a paste. It is preferably liquid at room temperature. .
- thermosetting resin used in the resin paste examples include liquid cyanate resin, liquid epoxy resin, various acrylic resins, maleimide resin, triaryl isocyanurate having aryl group. These include compounds having a radically polymerizable functional group, etc., and these can be used alone or in combination.
- liquid epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol E type epoxy resins, alicyclic epoxy resins, aliphatic epoxy resins, glycidyl resins. Examples include a min-type liquid epoxy resin.
- thermosetting resin used in the resin paste a thermosetting resin that is solid at room temperature can also be mixed and used to such an extent that no characteristic deterioration occurs.
- thermosetting resins that are solid at room temperature that can be used together are not particularly limited.
- epoxy resins for example, bisphenol A, bisphenol F, phenol nopolac, Polydaridyl ether, biphenyl type epoxy resin, stilbene type epoxy resin, hydride quinone type epoxy resin, triphenol methane type epoxy resin, phenolic acid obtained by reaction of enovolaks with epichlorohydrin Ralalkyl type (including phenylene and diphthalene skeletons) epoxy resin and epoxies including naphthalene skeleton
- the resin include di-cyclopentagen type epoxy resin.
- Mono-epoxy resins such as n-butinoreglycidyl ether, versatic acid glycidyl ester, styrene oxide, ethyl hexyl glycidyl ether, phenol glycidyl ether, cresyl glycidyl ether, and butyl phenol glycidyl ether can also be used. It is.
- maleimide resin for example, N, N,-(4, 4, -diphenylmethane) bismaleimide, bis (3 ethyl 5-methyl-4-maleimidophenol) methane, 2, 2 bis [4-(4 And bismaleimide resin such as maleimidophenoxy) phenol] propane.
- thermosetting resin used in the resin paste examples include metal complexes such as copper acetyl cetate and zinc acetyl cintonate.
- curing agent in the case of using epoxy resin as the thermosetting resin examples include phenol resin, aliphatic amine, aromatic amine, dicyandiamide, dicarboxylic acid dihydrazide compound, carboxylic acid anhydride and the like. Can be mentioned.
- the initiator in the case of using a compound having a radically polymerizable functional group as the thermosetting resin is not particularly limited as long as it is a catalyst that is usually used in radical polymerization. For example, an organic peroxide is used. And the like, and the like.
- curing accelerators and curing agents in the case of using epoxy resin as the thermosetting resin used in the resin paste include various imidazole compounds, such as 2-methylimidazole, 2 Ethyl imidazole, 2-phenol 4-methyl-5-hydroxymethyl imidazole, 2-CH imidazole
- Fillers that can be used for the resin paste include inorganic fillers and organic fillers.
- the inorganic filler include metal powder such as gold powder, silver powder, copper powder, and aluminum powder, fused silica, crystalline silica, silicon nitride, alumina, aluminum nitride, and talc.
- the organic filler include silicone resin, fluorine resin such as polytetrafluoroethylene, acrylic resin such as polymethyl methacrylate, and a cross-linked product of benzoguanamine, melamine and formaldehyde.
- metal powder is mainly used to impart electrical conductivity and thermal conductivity.
- silver powder is particularly preferred because of its wide variety of particle sizes and shapes and its availability.
- the filler used in the resin paste preferably has a content of ionic impurities such as halogen ions and alkali metal ions of 10 ppm or less.
- ionic impurities such as halogen ions and alkali metal ions of 10 ppm or less.
- As the shape a flake shape, a scale shape, a dendritic shape, a spherical shape, or the like is used.
- Different particle sizes used depending on the required viscosity of the resin paste The average particle size is usually not less than 0 and not more than 20 m, and the maximum particle size is preferably not more than about 50 m. When the average particle size is in the above range, it is possible to suppress the increase in viscosity and the occurrence of bleeding due to the outflow of the fat during application or curing.
- the maximum particle size is within the above range, it is possible to prevent a situation in which the needle outlet is blocked and continuous use cannot be performed when applying the paste. Further, a relatively coarse filler and a fine filler can be mixed and used, and various kinds of shapes and shapes may be appropriately mixed.
- a filler used in the resin paste for example, a nanoscale filler having a particle size of about lnm to lOOnm, a composite material of silica and acrylic, an organic filler An organic / inorganic composite filler or the like having a metal coating on its surface may be added.
- the filler used in the resin paste may be one whose surface has been previously treated with a silane coupling agent such as alkoxysilane, allyloxysilan, silazane, or organoaminosilane.
- a silane coupling agent such as alkoxysilane, allyloxysilan, silazane, or organoaminosilane.
- the resin paste for die bonding that can be used in the present invention includes a silane coupling agent, a titanate coupling agent, a stress reducing agent, a pigment, a dye, an antifoaming agent within a range that does not impair the characteristics depending on the application if necessary.
- An additive such as an agent, a surfactant, and a solvent can be used.
- the resin paste for die bonding used in the present invention preferably contains an epoxy resin, a curing agent, and an inorganic filler.
- the epoxy resin is contained in an amount of 1 equivalent to 10 equivalents, preferably 1 equivalent to 6 equivalents, per equivalent of the curing agent.
- the content of the inorganic filler is 70 wt% or more and 90 wt% or less, preferably 70 wt% or more, 85 wt% in the resin paste. % Or less. These numerical ranges can be combined as appropriate.
- the resin paste for die bonding is made of yarn as described above, a cured product having a modulus of elasticity at 260 ° C. of IMPa or more and 120 MPa or less can be obtained.
- each component is premixed and kneaded using a three-roll, wet bead mill or the like to obtain a resin paste, and then under vacuum Defoaming may occur.
- thermosetting resin hydrogenated service Liquid epoxy resin such as phenol type A epoxy resin, 1,4-cyclohexanedimethanol diglycidyl ether, 1,4 butanediol diglycidyl ether, 1,6 hexanediodiglycidyl ether;
- Solid epoxy resin such as dicyclopentagen type epoxy resin
- Polybutadiene, polyisoprene, polyalkylene oxide, aliphatic, etc., having functional groups capable of radical polymerization in the molecule eg, talyloyl group, methacryloyl group, acrylamide group, maleimide group, vinyl ester group, butyl ether group
- functional groups capable of radical polymerization in the molecule eg, talyloyl group, methacryloyl group, acrylamide group, maleimide group, vinyl ester group, butyl ether group
- V or skeleton containing no aromatic ring such as an aliphatic chain (hydrocarbon chain) or alicyclic skeleton
- a low-stress gelling agent such as a carboxyl group-terminated butadiene-acrylonitrile copolymer or phthalate ester.
- the resin film that can be used as the resin composition for die bonding of the present invention comprises a thermoplastic resin and a curable resin as main components, and the cured product has an elastic modulus at 260 ° C of IMPa or more and 120 MPa. It is characterized by the following.
- the elastic modulus of the cured product can be measured by the same method as that for the above-described resin paste.
- the thermoplastic resin used in the die bond resin film includes polyimide resin, polyimide resin such as polyetherimide resin, polyamide resin, polyamideimide resin, etc. Examples thereof include polyamide-based resin and acrylic resin. Of these, polyimide resin is preferred.
- the initial adhesion refers to the adhesion at the initial stage when the semiconductor element and the supporting member are bonded with the resin film for die bonding, that is, the adhesion before the resin film for die bonding is cured. .
- the polyimide resin is obtained by a polycondensation reaction of a tetracarboxylic dianhydride, a diaminopolysiloxane represented by the general formula (2), and an aromatic or aliphatic diamine.
- Rl and R2 each independently represent an aliphatic hydrocarbon group or aromatic hydrocarbon group having 1 to 4 carbon atoms.
- R3, R4, R5, and R6 are each independently Represents an aliphatic hydrocarbon group having 1 to 4 carbon atoms or an aromatic hydrocarbon group.
- Examples of the tetracarboxylic dianhydride used as a raw material for the polyimide resin include 3,3,, 4,4'-biphenyltetracarboxylic dianhydride, 3,3 ', 4,4' —Benzophenone tetra force Rubonic acid dianhydride, pyromellitic dianhydride, 4,4'-oxydiphthalic dianhydride, ethylene glycol bistrimellitic dianhydride, and the like.
- 4,4′-oxydiphthalic dianhydride is preferable in terms of adhesion.
- the above tetracarboxylic dianhydrides may be used alone or in combination of two or more.
- Examples of the diaminopolysiloxane represented by the formula (2) used as a raw material for the polyimide resin include ⁇ , ⁇ , monobis (2-aminoethyl) polydimethylsiloxane, ⁇ , ⁇ , monobis ( 4-aminophenol) polydimethylsiloxane, ⁇ , ⁇ -bis (3-aminopropyl) polydimethylsiloxane, etc. are mentioned, and in particular, the value of k in formula (2) is 1 to 25, preferably 1 to 10 Is preferable from the viewpoint of adhesiveness. In addition, two or more types may be used in combination as necessary to improve adhesion.
- Diamines used as raw materials for the polyimide resin include 3, 3 ′ dimethyl-4,4′-diaminobiphenyl, 4,6 dimethyl-m-phenylenediamine, 2,5 dimethyl-p-phenylenediamine, 2, 4 Diaminomesitylene, 4,4'-Methylenedi-tonoreidine, 4,4'-Methylenediamine 2,6 Xylidine, 4,4'-Methylene 2,6 Getylerin, 2,4 Toluenediamine, m-Phenylenediamine , P-phenylenediamine, 4,4'-diaminodiphenylpropane, 3,3, -diaminodiphenylpropane, 4,4'-diaminodiphenylethane, 3,3'-diaminodiphenylethane, 4 , 4'-diaminodiphenylmethane, 3,3'-diaminodiphenylmethane, 4,4'-di
- the equivalent ratio of the acid component to the amine component in the polycondensation reaction for obtaining the polyimide resin is an important factor for determining the molecular weight of the polyimide resin obtained. It is also well known that there is a correlation between the molecular weight and physical properties of the resulting polymer, especially the number average molecular weight and mechanical properties. The higher the number average molecular weight, the better the mechanical properties. Therefore, in order to obtain a practically excellent strength, it is necessary to have a certain high molecular weight.
- the equivalent ratio r of the acid component and the amine component of the polyimide resin is
- both strengths of the mechanical strength and heat resistance are in the range.
- r [equivalent number of all acid components] / [equivalent number of all amine components].
- aprotic polar solvent examples include ⁇ , ⁇ -dimethylformamide (DMF), ⁇ , ⁇ -dimethylacetamide (DMAC), ⁇ -methyl-2-pyrrolidone (NMP), tetrahydrofuran (THF), diglyme, cyclo Hexanone, 1,4-dioxane (1,4-DO), etc. Only one type of aprotic polar solvent may be used, or two or more types may be used in combination.
- a nonpolar solvent compatible with the above aprotic polar solvent may be mixed and used.
- Aromatic hydrocarbons such as toluene, xylene and solvent naphtha are often used.
- the proportion of the nonpolar solvent in the mixed solvent is preferably 30% by weight or less. This is because when the amount of nonpolar solvent exceeds 30% by weight, the solvent solubility decreases and polyamic acid may be precipitated.
- a well-dried diamine component is dissolved in the dehydrated and purified reaction solvent, and the ring closure rate is 98%. It is desirable to add 99% or more of well-dried tetracarboxylic dianhydride to proceed the reaction.
- the polyamic acid solution obtained as described above is subsequently dehydrated by heating in an organic solvent, and cyclized to imidize to obtain a polyimide resin. Since the water generated by the imidization reaction hinders the ring-closing reaction, an organic solvent that is incompatible with water is added to the system and azeotroped, and the system is used with a device such as a Dean-Stark tube. Drain outside. As an organic solvent incompatible with water, dichlorobenzene is known. For use in electronics, a chlorine component may be mixed, so the above aromatic hydrocarbon is preferably used. In addition, the use of compounds such as acetic anhydride, ⁇ -picoline, and pyridine as the catalyst for the imidization reaction is not hindered.
- the higher the imido ratio of the polyimide resin the better.
- imidization rate is low, imidation occurs due to heat during use and water is generated, which is not preferable. Therefore, it is desirable that an imidization rate of 95% or more, more preferably 98% or more is achieved. ,.
- Examples of the curable resin used in the die bond resin film include a thermosetting resin, an ultraviolet curable resin, and an electron beam curable resin.
- curable resin what has a function as a hardening
- the curable resin preferably contains a thermosetting resin. This can particularly improve heat resistance (particularly solder reflow resistance at 260 ° C).
- thermosetting resin examples include phenol novolac resin, cresol novolac resin, novolac type resin such as bisphenol A novolac resin, phenol resin such as resol phenol resin, and bisphenol A epoxy resin.
- Bisphenol type epoxy resin such as oil, bisphenol epoxy resin, novolak epoxy resin, novolac epoxy resin such as novolak epoxy resin, biphenyl type epoxy resin, stilbene type epoxy resin , Epoxy resin such as triphenol methane type epoxy resin, alkyl modified triphenol methane type epoxy resin, epoxy resin containing triazine nucleus, dicyclopentagen modified phenol type epoxy resin, urea (urea) resin, melamine ⁇ Fatty resin having triazine ring such as fat, unsaturated polyester resin, bismaleimide resin, polyurethane resin, diallyl phthalate resin, silicone resin, resin having benzoxazine ring, cyanate ester resin, etc. These may be used alone or in combination. Among these, epoxy resin is particularly preferable. Thereby, heat resistance
- the epoxy resin is not particularly limited as long as it has at least two epoxy groups in one molecule and is compatible with a thermoplastic resin (here, polyimide resin).
- a thermoplastic resin here, polyimide resin
- those having good solubility in a solvent used for synthesizing polyimide resin are preferable.
- examples include cresol novolac type epoxy compounds, phenol novolak type epoxy compounds, bisphenol A type diglycidyl ether, bisphenol F type diglycidyl ether, bisphenol A-epoxychlorohydrin type epoxy compounds, diphenol- Examples thereof include ether type epoxy compounds, biphenyl type epoxy compounds, hydrogenated bisphenol A type epoxy compounds and the like.
- the melting point of the epoxy resin is not particularly limited, but is preferably 50 ° C or higher and 150 ° C or lower, particularly preferably 60 ° C or higher and 140 ° C or lower. When the melting point is within the above range, particularly low temperature adhesion can be improved.
- the melting point can be evaluated by using, for example, a differential scanning calorimeter at the apex temperature of the endothermic peak of crystal melting that is heated from room temperature at a heating rate of 5 ° CZ.
- the content of the thermosetting resin is not particularly limited, but is preferably 1 part by weight or more and 100 parts by weight or less, particularly 5 parts by weight or more, with respect to 100 parts by weight of the thermoplastic resin. 50 parts by weight or less is preferable. When the content is within the above range, the heat resistance and toughness of the resin film can be improved.
- the resin film preferably contains a curing agent (particularly a phenolic curing agent).
- curing agent examples include aliphatic polyamines such as diethylenetriamine (DETA), triethylenetetramine (TETA), and metaxylylenediamine (MXDA), diaminodiphenylmethane (DDM), and m-phenylenediamine (MPDA).
- DETA diethylenetriamine
- TETA triethylenetetramine
- MXDA metaxylylenediamine
- DDM diaminodiphenylmethane
- MPDA m-phenylenediamine
- Aromatic polyamines such as diaminodiphenylsulfone (DDS), dicyandiamide (DICY), organic acid dihydrazide Amine hardeners such as polyamine compounds containing phosphine, alicyclic acid anhydrides (liquid acid anhydrides) such as hexahydrophthalic anhydride (HHPA) and methyltetrahydrophthalic anhydride (MTHPA), anhydrous Acid hardeners such as aromatic acid anhydrides such as trimellitic acid (TMA), pyromellitic anhydride (PMDA), and benzophenone tetracarboxylic acid (BTDA), and phenolic hardeners such as phenol resin.
- DDS diaminodiphenylsulfone
- DIY dicyandiamide
- organic acid dihydrazide Amine hardeners such as polyamine compounds containing phosphine, alicyclic acid anhydrides (liquid acid anhydrides) such as hexahydrophthalic
- phenolic hardeners are preferred.
- Bis (4hydroxy 3,5-dimethylphenol) methane (commonly known as tetramethylbisphenol F), 4,4'-sulfo-didiphenol, 4 , 4'—isopropylidenediphenol (commonly called bisphenol A), bis (4hydroxyphenol) methane, bis (2hydroxyphenol) methane, (2hydroxyphenol) (4hydroxyphenol) ) Methane, and bis (4 hydroxyphenol) methane, bis (2 hydroxyphenol) methane, and (2 hydroxyphenol) (4-hydroxyphenol) methane.
- Bisphenols such as bisphenol FD) manufactured by Kogyo Co., Ltd., 1,2-benzenediol, 1,3 benzenediol, 1,4 dihydroxybenzenes such as benzenediol, 1,2,4 Ben Compounds such as trihydroxybenzenes such as Ntriol, various isomers of dihydroxynaphthalene such as 1,6 dihydroxynaphthalene, and various isomers of biphenol such as 2,2, -biphenol, 4,4, -biphenol, etc. It is done.
- the content of the curing agent (especially a phenolic curing agent) of the epoxy resin is not particularly limited, but is 0.5 equivalent or more and 1.5 equivalent or less with respect to 1 equivalent of the epoxy resin. Particularly preferred is 0.7 equivalents or more and 1.3 equivalents or less. When the content is within the above range, the heat resistance can be improved, and a decrease in storage stability can be suppressed.
- the resin film for die bonding is not particularly limited, and it is preferable that the mold further contains a silane coupling agent. Thereby, adhesiveness can be improved more.
- the silane coupling agent has good compatibility with a thermoplastic resin (here, polyimide resin) and an epoxy compound, and good solubility in a solvent used when synthesizing the polyimide resin.
- a thermoplastic resin here, polyimide resin
- Those are preferred. Examples include butyltrichlorosilane, vinyltriethoxysilane, y-methacryloxypropyltrimethoxysilane, ⁇ —glycidoxypropyltrimethoxysilane, ⁇ —mercaptopropyltrimethoxysilane, ⁇ — ⁇ (aminoethyl) ⁇ — Minopropyltrimethoxysilane, ⁇ - ⁇ (aminoethyl) ⁇ -aminopropylmethyldimethoxysilane, ⁇ a Examples thereof include minopropyltriethoxysilane, N-phenyl-1- ⁇ -aminopropyltrimethoxysilane, and ⁇ -
- the content of the silane coupling agent is 0. 100 parts by weight of the thermoplastic resin.
- 01 parts by weight or more and 20 parts by weight or less are preferable, and 1 part by weight or more and 10 parts by weight or less are more preferable.
- the content is within the above range, good adhesive properties can be obtained.
- the resin film for die bonding is not particularly limited !, but preferably further contains a filler. Thereby, heat resistance can be improved more.
- the filler examples include inorganic fillers such as silver, titanium oxide, silica, and my strength, and fine organic fillers such as silicone rubber and polyimide. Of these, inorganic fillers, particularly silica, are preferred. Thereby, heat resistance can be improved more.
- the content of the filler is not particularly limited! However, it is particularly preferably 1 part by weight or more and 100 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin. The amount is preferably 10 parts by weight or more and 50 parts by weight or less. When the content is within the above range, the heat resistance and adhesion can be improved.
- the average particle diameter of the filler is not particularly limited.
- the wrinkle is preferably an average particle diameter of 0.1 ⁇ m or more and 25 ⁇ m or less, particularly preferably 0.5 ⁇ m. m to 20 ⁇ m is preferable.
- the average particle diameter is within the above range, the heat resistance can be improved, and the deterioration of the adhesiveness of the resin film for die bonding can be suppressed.
- the die-bonding resin film preferably contains a thermoplastic resin, a curable resin, and a silane coupling agent, and preferably contains a filler as necessary.
- thermoplastic resin when 100 parts by weight of thermoplastic resin is used,
- the content of curable rosin is 1 part by weight or more and 100 parts by weight or less, preferably 5 parts by weight or more and 50 parts by weight or less,
- the content of the silane coupling agent is 0.01 parts by weight or more and 20 parts by weight or less, preferably 1 part by weight or more and 10 parts by weight or less. Further, if necessary, the filler (particularly inorganic filler) is added in an amount of 1 part by weight or more and 100 parts by weight or less, preferably 100 parts by weight or less, preferably 100 parts by weight of the thermoplastic resin. It is contained in an amount of 10 to 50 parts by weight. These numerical ranges can be combined as appropriate.
- the resin film for die bonding has such a composition, a cured product having a modulus of elasticity at 25 ° C of SlMPa or more and 120 MPa or less can be obtained.
- the resin film for die bonding that can be used in the present invention includes, for example, the thermoplastic resin and the curable resin as main components, and an appropriate composition of the above-described components as necessary. Dissolve the product in a solvent such as methyl ethyl ketone, acetone, toluene, dimethylformaldehyde, dimethylacetamide, N-methyl 2-pyrrolidone, and put it into a varnish, followed by a comma coater, die coater, gravure coater, etc. It can be obtained by applying to a release sheet using, drying and then removing the release sheet.
- a solvent such as methyl ethyl ketone, acetone, toluene, dimethylformaldehyde, dimethylacetamide, N-methyl 2-pyrrolidone
- the thickness of the resin film for die bonding is not particularly limited, but is preferably 100 m or less, particularly preferably 5 ⁇ m or more and 75 ⁇ m or less. When the thickness is within the above range, it is particularly easy to control the thickness accuracy.
- the resin composition for sealing used in the present invention is mainly composed of epoxy resin, phenol resin curing agent, curing accelerator, and inorganic filler. Furthermore, the cured product obtained from the resin composition has a modulus of elasticity at 260 ° C of OOMPa or more and 1200 MPa or less, and the cured product has a coefficient of thermal expansion at 260 ° C of 20 ppm or more and 50 ppm or less.
- the product of the elastic modulus at 260 ° C and the thermal expansion coefficient of the cured product at 260 ° C is 8,000 or more and 45,000 or less.
- the elastic modulus of the cured product is measured according to JIS K 6911 and can be obtained as a flexural modulus at 260 ° C.
- the thermal expansion coefficient of the cured product is TMA (Thermo Mechanical Analysys) can measure the thermal expansion coefficient at 260 ° C of the TMA curve measured at a temperature increase rate of 5 ° CZ.
- the epoxy resin used in the sealing resin composition of the present invention refers to all monomers, oligomers and polymers having an epoxy group, such as bisphenol-type epoxy resin and biphenyl-type epoxy resin.
- Stilbene type epoxy resin such as hydroquinone type epoxy resin, orthocresol novolak type epoxy resin, triphenol methane type epoxy resin, phenol aralkyl type (including phenolene and diphenolene skeleton) epoxy
- the resin include an epoxy resin containing a naphthalene skeleton, a dicyclopentagen type epoxy resin, and these may be used alone or in combination.
- a resin having a flexible structure such as dicyclopentagen type epoxy resin, is preferred.
- phenol resin curing agent used in the sealing resin composition of the present invention at least two or more capable of forming a crosslinked structure by a curing reaction with the above epoxy resin.
- Monomers, oligomers, and polymers having a phenolic hydroxyl group such as phenol novolac resin, cresol novolac resin, phenol aralkyl (including phenol and biphenol skeletons) resin, naphthol Examples thereof include aralkyl resin, triphenol methanol resin, and dicyclopentagen type phenol resin. These may be used alone or in combination.
- the balance between heat flexibility and fluidity such as phenol aralkyl resin and naphthol aralkyl resin is used. It is preferred to use excellent phenolic resin. It is also possible to balance flexibility and fluidity by mixing multiple phenolic resins instead of single.
- the equivalent ratio of the number of epoxy groups of the total epoxy resin used in the sealing resin composition of the present invention to the number of phenolic hydroxyl groups of the total phenol resin is preferably 0.5 or more and 2 or less, particularly 0.7 or more and 1.5 or less are more preferable. Within the above range, it is possible to suppress a decrease in moisture resistance and curability.
- the curing accelerator used in the sealing resin composition of the present invention refers to one that can be a catalyst for the crosslinking reaction between the epoxy resin and the phenol resin, for example, 1,8-diazabicyclo (5, 4, 0) undecene-7, amine compounds such as tributylamine, organophosphorus compounds such as triphenylphosphine and tetraphenylphosphate tetrafluorophosphate, imidazole compounds such as 2-methylimidazole Examples include compounds. However, it is not limited to these and may be used alone or in combination.
- the inorganic filler used in the sealing resin composition of the present invention is not particularly limited, and those generally used for sealing materials can be used. Examples include fused silica, crystalline silica, secondary agglomerated silica, alumina, titanium white, aluminum hydroxide, tar, clay, and glass fiber. These may be used alone or in combination of two or more. May be. In particular, fused silica is preferable. It is more preferable to use mainly spherical silica in order to increase the amount of fused silica that can be used in either crushed form or spherical form, and to suppress the increase in the melt viscosity of the epoxy resin composition.
- the blending amount of all inorganic fillers is preferably 80% by weight or more and 95% by weight or less in the balance of moldability and reliability in the total epoxy resin composition. When the blending amount is within the above range, it is possible to suppress a decrease in crack resistance and a decrease in fluidity due to an increase in the thermal expansion coefficient during heating.
- the epoxy resin composition used as the sealing resin composition of the present invention includes an epoxy resin, a phenol resin curing agent, a curing accelerator, an inorganic filler, and, if necessary, a brominated epoxy resin.
- Flame retardants such as resin, antimony oxide, phosphorus compounds, and inorganic compounds such as acid bismuth hydrate Exchangers, coupling agents such as glycidoxypropyltrimethoxysilane, colorants such as carbon black and bengara, low stress components such as silicone oil and silicone rubber, natural waxes, synthetic waxes, higher fatty acids and their
- Various additives such as metal salts or mold release agents such as paraffin, and anti-oxidation agents may be appropriately blended.
- the inorganic filler may be pre-treated with a coupling agent, epoxy resin or phenol resin as a method of removing the solvent after mixing with a solvent.
- a coupling agent epoxy resin or phenol resin
- it may be added directly to the inorganic filler and processed using a mixer.
- low-stress components such as silicone oil and silicone rubber tend to decrease the thermal elastic modulus and increase the thermal coefficient of thermal expansion due to the additive, and adjust the blending amount well. This makes it possible to improve the cracking property, but in that case, it is important to balance the combination of the amount of filler, epoxy resin, and phenol resin curing agent.
- the equivalent ratio of the number of epoxy groups of all epoxy resins and the number of phenolic hydroxyl groups of all phenol resins is 0.5 or more and 2 or less, preferably 0.7 or more, 1.
- an inorganic filler is included in the resin composition in an amount of 80 wt% or more and 95 wt% or less.
- the sealing resin composition has an elastic modulus at 260 ° C of 4 OOMPa or more, 1200 MPa or less, 260.
- the properties of the encapsulated material are defined by “the product of the elastic modulus at 260 ° C. and the thermal expansion coefficient at 260 ° C.”. This is due to the following reason. Silicon chips and lead frames have a smaller coefficient of thermal expansion at 260 ° C, which is the mounting temperature, than the cured sealant, so the cured encapsulant and silicon chip are affected by the stress caused by the difference in thermal expansion during mounting. Alternatively, peeling may occur between the lead frames (hereinafter also referred to as members).
- the present inventors have intensively studied the relationship between the occurrence of peeling and the properties of the encapsulated material by FEM (finite element method) stress analysis, etc., and in order to suppress the occurrence of peeling between members, the stress should be reduced. That is, i) reducing the difference in thermal expansion coefficient between members;
- the properties of the cured encapsulating material are expressed by “the product of the elastic modulus at 260 ° C. and the thermal expansion coefficient at 260 ° C.”, i) and ii) above occur between the members.
- the relationship with stress can be expressed directly.
- the difference in thermal expansion coefficient between the silicon chip or lead frame and the cured encapsulant is sufficiently low and the elastic modulus of each member is sufficiently small. Can be made sufficiently small, and the occurrence of peeling can be effectively suppressed.
- the sealing material cured product is required to have a certain level of mechanical strength, such as enabling sealing molding. From this viewpoint, the lower limit of the elastic modulus having a high correlation with the mechanical strength is as follows: More than 8,000 are required.
- the elastic modulus at 260 ° C of the cured resin composition for sealing is 400 MPa or more and 1200 MPa or less, the coefficient of thermal expansion at 260 ° C is 20 ppm or more and 50 ppm or less, and the elasticity at 260 ° C
- biphenyl type epoxy resin, bisphenol type epoxy resin, phenol aralkyl type epoxy resin Epoxy resin and / or phenol aralkyl resin and naphthol aralkyl resin that have a good balance between heat flexibility and fluidity such as heat It is more preferable to use phenol resin.
- spherical silica having a broader particle size distribution and to make the blending amount of the total inorganic filler high to about 80% by weight or more and 95% by weight or less with respect to the total epoxy resin composition.
- a low-stress component such as silicone oil or silicone rubber can be added within a range not exceeding the upper limit of the linear expansion coefficient at 260 ° C to lower the elastic modulus at 260 ° C.
- the sealing resin composition of the present invention comprises an epoxy resin, a phenol resin curing agent, and a curing accelerator. Agents, inorganic fillers, other additives, and the like are mixed at room temperature using a mixer, melt-kneaded with a kneader such as an extruder such as a roll or kneader, cooled and pulverized.
- a kneader such as an extruder such as a roll or kneader
- a method for manufacturing a semiconductor device using such a resin composition will be described below. However, it is not limited to the following methods.
- the semiconductor element 18 whose surface is covered with the notfer coat film 26 is manufactured.
- a resin composition for a nofer coat is applied to a suitable support such as a silicon wafer, a ceramic, an aluminum substrate or the like.
- a plurality of bonding pads 20 may be formed on the surfaces of these supports, and a passivation film 24 may be formed so as to fill the gaps between the bonding pads 20.
- the coating method include spin coating using a spinner, spray coating using a spray coater, dipping, printing, and roll coating.
- a desired pattern shape is formed by a normal exposure process.
- the actinic radiation irradiated in the exposure step those having a wavelength of 200 to 700 nm that can use X-rays, electron beams, ultraviolet rays, visible rays, and the like are preferable.
- the coating film is baked.
- the reaction rate of epoxy crosslinking can be increased.
- Baking conditions are 50-200 ° C.
- the temperature is preferably 80 to 150 ° C, more preferably 90 to 130 ° C.
- developers include alkanes such as pentane, hexane, heptane and cyclohexane, hydrocarbons such as cycloalkane, and aromatic solvents such as toluene, mesitylene and xylene.
- terpenes such as limonene, dipentene, vinylene, and mecrine
- ketones such as cyclopentanone, cyclohexanone, and 2-heptanone
- an organic solvent to which an appropriate amount of a surfactant is added is preferable.
- the relief pattern formed by development is rinsed. Use alcohol as the rinse solution.
- heat treatment is performed at 50 to 200 ° C. to remove the developing solution and the rinsing solution.
- a final pattern rich in heat resistance is obtained.
- the patterned silicon wafer is cut into small pieces by dicing, whereby the semiconductor element 18 whose surface is covered with the notfer coat film 26 can be obtained.
- the film thickness of the notfer coat film 26 can be about 5 ⁇ m.
- the semiconductor element 18 is bonded onto the pad 13 of the lead frame 12 with a resin composition for die bonding.
- the resin paste for die bonding is put on the pad 13 of the lead frame 12 by multi-point-one-dollar or one-point-one-point coating, one-point-one-line coating, screen printing, or stamping. Apply to.
- the semiconductor element 18 whose surface is coated with the notfer coat film 26 is mounted on the pad 13, and is heated by an oven, a hot plate, an in-line cure device, etc. by a known method to cure the resin paste, and the semiconductor element Adhere 18.
- the method for bonding the semiconductor element 18 using the resin film for die bonding is performed as follows.
- the semiconductor element 18 is placed on the pad 13 of the lead frame 12 via a die bonding resin film. Then, crimp at a temperature of 80-200 ° C for 0.1-30 seconds. Further, heat cure for 60 minutes in an oven at 180 ° C.
- the semiconductor element 18 whose surface is coated with the nofer coat film 26 is mounted on the pad 14 of the lead frame 12 and cured, and then the surface of the nofer coat film 26 is subjected to plasma treatment. Is preferred. By carrying out the plasma treatment, the surface of the nofer coat film 26 is roughened. Further, in the case of oxygen-containing plasma, there is an advantage that it has excellent adhesion to an epoxy-based sealing resin because it is hydrophilic.
- the bonding pad 20 of the semiconductor element 18 and the lead frame 12 are connected via the bonding wire 22 by a normal method.
- the sealing resin composition is used to transfer molds and compressors. Curing and molding may be performed by a conventional molding method such as a cache mold or an injection mold.
- the elastic modulus at 25 ° C. of the notfer coat film 26 is 0.5 GPa or more and 2. OGPa or less, preferably 0.5 GPa or more and 1. OGPa or less,
- the elastic modulus of cured die bond material 16 at 260 ° C is IMPa or more and 120MPa or less, preferably 5MPa or more and lOOMPa or less,
- the elastic modulus at 260 ° C of cured material 28 is 400MPa or more and 1200MPa or less, preferably 400MPa or more and 800MPa or less.
- the thermal expansion coefficient of the cured product at 260 ° C is 20ppm or more and 50ppm or less. , Preferably 20 ppm or more and 40 ppm or less, and the product of the elastic modulus at 260 ° C. of the cured sealing material 28 and the thermal expansion coefficient of the cured sealing material 28 at 260 ° C. is 8,000 or more, 45 , 000 or less. These numerical ranges can be combined as appropriate.
- the elastic modulus of the nother coat film 26, the die bond material cured product 16, and the encapsulated material cured product 28 is within the above numerical range, the solder reflow resistance in mounting using lead-free solder is sufficient. Excellent reliability and high reliability can be obtained.
- the blending ratio is parts by weight.
- a resin composition for buffer coating (A-3) was obtained by preparing in the same manner as (A-1) except that the ratio of decylnorbornene Z glycidyl methyl ether norbornene was 90 Z10.
- the resin composition for buffer coating obtained above on a silicon wafer using a spin coater After applying the resin composition for buffer coating obtained above on a silicon wafer using a spin coater, it was dried on a hot plate at 120 ° C for 5 minutes to obtain a coating film having a film thickness of about 10 / zm . After curing, this was diced to a width of 100 mm, and the strip-shaped test piece was placed in a 2% aqueous hydrofluoric acid solution to dissolve the silicon wafer substrate, washed and dried to obtain a film-shaped test piece. The tensile strength of the obtained specimen was measured with Tensilon according to JIS K-6760. The Young's modulus (25 ° C) was calculated from the obtained SS curve.
- the elastic modulus of the cured product (buffer coat film) formed from the above-mentioned resin composition for buffer coat (A-1) is 0.5 GPa
- the elastic modulus of the buffer coat film in which force was also formed was 3.5 GPa
- the elastic modulus of the buffer coat film (A-3) force formed above was 0.2 GPa. Since the resin composition for buffer coating (A-3) had a problem with exposure, it was not evaluated as a knocker.
- Each component having the composition shown in Table 1 and a filler were blended, and kneaded five times at room temperature using a three roll (roll interval 50 mZ30 m) to prepare a resin paste.
- the resin paste was defoamed at 2 mmHg for 30 minutes in a vacuum chamber, and then the elastic modulus was evaluated by the following method.
- the formulation and evaluation results are shown in Table 1.
- the blending unit is parts by weight.
- the raw material components used are as follows.
- BPA Bisphenol A type epoxy resin
- DDA Dicyandiamide
- imidazole 2-Four 4 Methyl 5 Hydroxymethylimidazole (manufactured by Shikoku Chemicals Co., Ltd., Curesol 2P4MHZ, hereinafter referred to as “imidazole”)
- 'Silver powder Flaky silver powder with an average particle size of 3 ⁇ m and a maximum particle size of 30 ⁇ m
- resin varnish (B-3) polyimide resin as thermoplastic resin PIA (1,3-bis (3-aminophenoxy) benzene as diamine component (APB manufactured by Mitsui Chemicals, Inc.) 43 85 g (0.15 mol) and ⁇ , ⁇ -bis (3-aminopropyl) polydimethylsiloxane (average molecular weight 837) (G9 manufactured by Fuso i Gakki Co., Ltd.) 125.55 g (0.15 mol) and acid Polyimide resin (hereinafter referred to as “PIA”) obtained by synthesizing 93.07 g (0.30 mol) of 4,4′-oxydiphthalic dianhydride (manufactured ODPA-M) as an ingredient, Tg : 70 ° C, weight average molecular weight 30,000) 87.0 parts by weight, curable resin as epoxy resin (EOCN-1020-80 (orthocresol novolac epoxy resin),
- PIA polyimide resin as
- Each component was mixed at room temperature with a mixer, kneaded at 70 to 120 ° C. with a two-neck, cooled and pulverized to obtain an epoxy resin composition for sealing.
- the main raw material components used and the characteristics evaluation method of the obtained rosin composition are shown below.
- 'Epoxy resin 1 phenol aralkyl epoxy resin with biphenylene-skeleton (Nippon Kayaku Co., Ltd., NC3000P, softening point 58 ° C, epoxy equivalent 274)
- Epoxy resin 2 Orthocresol novolac epoxy resin (manufactured by Sumitomo Chemical Co., Ltd., ES CN195LA, softening point 55 ° C, epoxy equivalent 199)
- Epoxy resin 3 Phenolic-felt aralkyl epoxy resin (Mitsui Chemicals, E—XLC-3L, softening point 53 ° C, hydroxyl equivalent 236)
- Phenolic phenol aralkyl resin (Mitsui Chemicals, XLC-4L, softening point 65 ° C, hydroxyl equivalent 175 ° C)
- Phenol resin 3 Phenol novolak resin (soft soft point 80 ° C, hydroxyl equivalent 105) • Spherical fused silica: Average particle size 20 ⁇ m
- TMA 1, a 2, Tg Molding of 10mm X 4mm X 4mm using a transfer molding machine, mold temperature 175 ° C, injection pressure 6.9MPa, curing time 90 seconds, 175 ° C2 After curing in time, TMA was measured at a heating rate of 5 ° CZ.
- the thermal expansion coefficients of the obtained TMA curve at 60 ° C and 260 ° C are respectively ⁇ 1 and a 2, and the tangent intersection temperature at 60 ° C and 260 ° C is read, and this temperature is the glass transition temperature Tg).
- Flexural modulus (260 ° C): Measured according to JIS K 6911. Using a transfer molding machine, a test piece of 80 mm x 10 mm x 4 mm was molded at a mold temperature of 175 ° C, injection pressure of 6.9 MPa, curing time of 90 seconds, and post-cured at 175 ° C for 2 hours. The flexural modulus was measured at ° C. The formulation and results are shown in Table 2. The blending unit is parts by weight. [0085] Table 2
- the prepared resin composition for buffer coating is applied onto a silicon wafer with a circuit formed using a spin coater and then dried at 120 ° C for 5 minutes on a hot plate to form a coating film with a film thickness of about 10 m. Obtained.
- This coating film was exposed at 300 mjZcm 2 through a reticle using an i-line stepper exposure machine NSR-4425i (manufactured by Nikon Corporation). Thereafter, the mixture was heated on a hot plate at 100 ° C. for 4 minutes to promote the crosslinking reaction in the exposed area.
- the unexposed portion was dissolved and removed by immersing in limonene for 30 seconds, and then rinsed with isopropyl alcohol for 20 seconds. As a result, it was confirmed that the pattern was formed.
- This annular olefin-based resin membrane was subjected to oxygen plasma treatment using a plasma apparatus (OPM-EM1000) manufactured by Tokyo Ohka.
- OPM-EM1000 a plasma apparatus manufactured by Tokyo Ohka.
- the conditions are: output is 400W, oxygen flow is 2 at 10 minutes OOsccm was adopted.
- a 160-pin LQFP (Low Profile Quad Flat Package) buffer-coated semiconductor element (semiconductor element size 7 mm X 7 mm, semiconductor element thickness 0.35 mm) is mounted via a resin paste for die bonding, Cured with.
- the curing condition was that the temperature was raised from room temperature to 175 ° C in 30 minutes, held at 175 ° C for 30 minutes, and the thickness of the resin paste after curing was about 20 m.
- the back surface of a 0.35 mm thick wafer was attached to one side of the adhesive film at 150 ° C to obtain a wafer with an adhesive film.
- a die cinder film was attached to the adhesive film surface.
- the semiconductor wafer to which the adhesive film is bonded is diced (cut) into a semiconductor element size of 7 mm x 7 mm at a spindle rotation speed of 30000 rpm and a cutting speed of 50 mmZsec to obtain a die cinder film and an adhesive A semiconductor element bonded with a film was obtained.
- the dicing sheet back surface force was also pushed up, and the semiconductor element peeled off between the die cinder film and the adhesive film layer and bonded to the adhesive film was bonded to a 160-pin LQFP.
- the curing condition was that the temperature was raised from room temperature to 180 ° C in 30 minutes and kept at 180 for 60 minutes.
- the mold temperature was 175 ° C
- injection pressure was 6.9 MPa
- curing time was 90 seconds
- 160-pin LQFP with a semiconductor element mounted with a resin paste or resin film was sealed and molded.
- a sample was obtained after post-curing at 2 ° C for 2 hours.
- Each of the 16 samples was separately treated at 85 ° C, 60% relative humidity for 168 hours and 85 ° C, 85% relative humidity for 168 hours, then IR reflowed (260 ° C). Processed for 10 seconds. Observation was performed using an ultrasonic flaw detector, and the presence or absence of internal cracks and various interface peelings was examined. For the ultrasonic flaw detector that cannot identify the interface peeling at which position, the peeling interface was specified by cross-sectional observation. Any internal cracks or peeling forces found at various interfaces were considered defective, and nZl6 was displayed when the number of defective packages was n. (Table 3)
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Description
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- 2006-03-17 CN CNB2006800039700A patent/CN100477179C/zh not_active Expired - Fee Related
- 2006-03-17 SG SG201001189-8A patent/SG160331A1/en unknown
- 2006-03-17 JP JP2007510395A patent/JP4935670B2/ja active Active
- 2006-03-24 MY MYPI20061309A patent/MY147837A/en unknown
- 2006-03-24 US US11/388,791 patent/US20060228562A1/en not_active Abandoned
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JP2008103523A (ja) * | 2006-10-19 | 2008-05-01 | Sekisui Chem Co Ltd | 半導体装置及びその製造方法 |
JP2009070916A (ja) * | 2007-09-11 | 2009-04-02 | Kyocera Chemical Corp | 発光ダイオード用ダイボンディングペースト |
JP2011204917A (ja) * | 2010-03-25 | 2011-10-13 | Sumitomo Bakelite Co Ltd | 半導体用接着剤および半導体装置 |
JPWO2013065788A1 (ja) * | 2011-11-04 | 2015-04-02 | ナミックス株式会社 | ダイボンディング剤 |
WO2015045846A1 (ja) * | 2013-09-24 | 2015-04-02 | 日東電工株式会社 | 半導体チップ封止用熱硬化性樹脂シート及び半導体パッケージの製造方法 |
JP2015086359A (ja) * | 2013-09-24 | 2015-05-07 | 日東電工株式会社 | 半導体チップ封止用熱硬化性樹脂シート及び半導体パッケージの製造方法 |
US9659883B2 (en) | 2013-09-24 | 2017-05-23 | Nitto Denko Corporation | Thermally curable resin sheet for sealing semiconductor chip, and method for manufacturing semiconductor package |
TWI618615B (zh) * | 2015-08-12 | 2018-03-21 | Zhao Chang Wen | Method for forming thermosetting resin package sheet |
Also Published As
Publication number | Publication date |
---|---|
KR101036728B1 (ko) | 2011-05-24 |
JP4935670B2 (ja) | 2012-05-23 |
JPWO2006103962A1 (ja) | 2008-09-04 |
MY147837A (en) | 2013-01-31 |
KR20070118132A (ko) | 2007-12-13 |
TW200700490A (en) | 2007-01-01 |
US20060228562A1 (en) | 2006-10-12 |
CN100477179C (zh) | 2009-04-08 |
TWI388619B (zh) | 2013-03-11 |
CN101116184A (zh) | 2008-01-30 |
SG160331A1 (en) | 2010-04-29 |
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