WO2022202434A1 - 導電性ペーストおよび半導体装置 - Google Patents
導電性ペーストおよび半導体装置 Download PDFInfo
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- WO2022202434A1 WO2022202434A1 PCT/JP2022/011253 JP2022011253W WO2022202434A1 WO 2022202434 A1 WO2022202434 A1 WO 2022202434A1 JP 2022011253 W JP2022011253 W JP 2022011253W WO 2022202434 A1 WO2022202434 A1 WO 2022202434A1
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- conductive paste
- meth
- silver powder
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- mass
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- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- QJAVUVZBMMXBRO-UHFFFAOYSA-N tripentyl phosphate Chemical compound CCCCCOP(=O)(OCCCCC)OCCCCC QJAVUVZBMMXBRO-UHFFFAOYSA-N 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical class [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Images
Classifications
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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
- C08G59/18—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
- C08G59/40—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 characterised by the curing agents used
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L24/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
- H01L2224/29199—Material of the matrix
- H01L2224/292—Material of the matrix with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/29238—Material of the matrix with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/29239—Silver [Ag] as principal constituent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
- H01L2224/29199—Material of the matrix
- H01L2224/2929—Material of the matrix with a principal constituent of the material being a polymer, e.g. polyester, phenolic based polymer, epoxy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
Definitions
- the present invention relates to conductive pastes and semiconductor devices. More specifically, the present invention relates to a conductive paste used as a die attach paste for semiconductor mounting used for bonding and fixing a semiconductor element onto a support member such as a metal frame, and a conductive paste using the conductive paste. It relates to a manufactured semiconductor device.
- a semiconductor device is manufactured by bonding a semiconductor element such as a semiconductor chip to a support member such as a lead frame or a glass epoxy wiring board using a die bonding material.
- a die bonding material a resin paste in which a conductive filler is dispersed in a binder resin and a sintered silver paste that does not contain a binder resin are known.
- a (meth)acrylic resin/epoxy resin mixed paste composition containing an acrylic acid ester compound or a methacrylic acid ester compound, an epoxy resin, and a filler is known (for example, Patent Document 1).
- a silver paste a paste-like composition containing silver particles and a volatile dispersion medium has been proposed.
- a technique has been proposed for ensuring heat resistance and high density of a silver sintered body by using a silver paste mixed with nano-sized silver particles coated with an organic substance having a group.
- the present invention has been made in view of such circumstances, and a conductive paste having high sinterability and high thermal conductivity, and by using the conductive paste, adhesion to a support member such as a lead frame is improved. It is an object of the present invention to provide a highly reliable semiconductor device which is improved and thus can firmly bond a semiconductor element and a supporting member.
- the inventors have found that the use of a specific additive accelerates the sintering of silver powder, thereby obtaining a conductive paste with high thermal conductivity, and have completed the present invention.
- n is an integer of 0 to 4
- R 1 is a hydrogen atom, a hydroxyl group, an organic group having 1 to 6 carbon atoms, or an organic group having 1 to 6 carbon atoms substituted with a hydroxyl group.
- a conductive paste is provided comprising:
- a support member a semiconductor element mounted on the support member via an adhesive layer,
- a semiconductor device is provided in which the adhesive layer is made of the conductive paste.
- a conductive paste having high sinterability and high thermal conductivity, and a highly reliable semiconductor device manufactured using the conductive paste are provided.
- the conductive paste of this embodiment is a die attach paste used for forming a die attach layer for bonding an electronic component such as a semiconductor element to a support member such as a lead frame or a wiring board.
- the conductive paste of the present embodiment contains silver powder, which is a conductive metal powder, a compound represented by general formula (1), and a diluent.
- n is an integer of 0 to 4
- R 1 is a hydrogen atom, a hydroxyl group, an organic group having 1 to 6 carbon atoms, or an organic group having 1 to 6 carbon atoms substituted with a hydroxyl group. be.
- heat treatment causes the silver powders to agglomerate with each other to form a silver particle connection structure.
- the die attach layer obtained by heating the conductive paste in this way has electrical conductivity or thermal conductivity, and has high adhesion to the supporting member.
- the conductive paste of the present embodiment promotes sintering of the silver powder, and as a result can function as an adhesive layer with high thermal conductivity.
- the interaction between the surface treatment agent applied to the silver powder and the compound of formula (1) or its decomposition product causes the surface treatment agent present on the surface of the silver powder to detach, resulting in the silver powder surface is activated, and aggregation and sintering of the silver powder are promoted.
- silver powder The silver powder contained in the conductive paste of the present embodiment aggregates to form a silver particle linked structure by subjecting the conductive paste to heat treatment. That is, in the die attach paste layer obtained by heating the conductive paste, the silver powder particles are present in agglomerated form. Thereby, electrical conductivity, thermal conductivity, and adhesion to the supporting member are exhibited.
- the shape of the silver powder is not particularly limited, but may be, for example, spherical, flaky, and scaly.
- the silver powder more preferably contains spherical particles.
- the uniformity of aggregation of silver powder can be improved.
- the silver powder may contain both spherical particles and flaky particles.
- the average particle size (D 50 ) of the silver powder is, for example, 0.1 ⁇ m or more and 10 ⁇ m or less.
- the average particle size of the silver powder is equal to or more than the above lower limit, it is possible to suppress an excessive increase in the specific surface area and suppress a decrease in thermal conductivity due to contact thermal resistance. Further, when the average particle size of the silver powder is equal to or less than the above upper limit, it becomes possible to improve the formability of the silver particle connected structure between the silver powders.
- the average particle size (D 50 ) of the silver powder is more preferably 0.6 ⁇ m or more and 2.7 ⁇ m or less, and more preferably 0.6 ⁇ m or more and 2.0 ⁇ m or less. is particularly preferred.
- the average particle size (D 50 ) of the silver powder can be measured using, for example, a commercially available laser particle size distribution analyzer (eg, SALD-7000 manufactured by Shimadzu Corporation).
- the maximum particle size of the silver powder is not particularly limited, it can be, for example, 1 ⁇ m or more and 50 ⁇ m or less, more preferably 3 ⁇ m or more and 30 ⁇ m or less, and particularly preferably 4 ⁇ m or more and 18 ⁇ m or less. This makes it possible to more effectively improve the balance between the uniformity of aggregation of the silver powder and the dispensability.
- the content of silver powder in the conductive paste is, for example, 40% by mass or more and 90% by mass or less, preferably 50% by mass or more and 80% by mass or less, relative to the entire conductive paste.
- the content of silver powder in the conductive paste is, for example, 40% by mass or more and 90% by mass or less, preferably 50% by mass or more and 80% by mass or less, relative to the entire conductive paste.
- the silver powder used in the conductive paste of the present embodiment may contain silver powder surface-treated with fatty acid.
- Fatty acids used for surface treatment of silver powder include caproic acid, caprylic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, palmitoleic acid, oleic acid and erucic acid. From the viewpoint of ease of production and availability, it is preferable to use silver particles surface-treated with stearic acid or oleic acid.
- Examples of the method of surface-treating silver particles with a fatty acid such as stearic acid include, but are not limited to, a method in which a fatty acid diluted in a solvent is treated with a ball mill or the like together with the silver particles, and then the solvent is dried. not a thing
- the amount thereof is, for example, 0.05% by mass or more and 1% by mass or less, preferably 0.2% by mass or more and 0.7% by mass or less, based on the total silver powder used. It is below.
- the fatty acid-treated silver particles in an amount within the above range, the adhesion of the obtained conductive paste to the supporting member can be improved.
- the conductive paste of this embodiment may contain other conductive metal powder in addition to the silver powder described above.
- Other conductive metal powders that can be used include gold powder, platinum powder, palladium powder, copper powder, nickel powder, and alloys thereof.
- it is, for example, 0.05% by mass or more and 1% by mass or less, preferably 0.2% by mass or more and 0.7% by mass or less, relative to the silver particles.
- the conductive paste of this embodiment contains the compound represented by formula (1).
- n is an integer of 0 to 4, preferably an integer of 1 to 3, more preferably 1 or 2
- R 1 is a hydrogen atom, a hydroxyl group, and 1 carbon atom to 6 organic groups, or organic groups having 1 to 6 carbon atoms substituted with a hydroxyl group.
- the conductive paste of the present embodiment has good sinterability, and as a result, has high thermal conductivity and high adhesiveness. It is believed that this is due to the action of the compound (1).
- the compound represented by formula (1) used in the conductive paste of the present embodiment preferably has a boiling point in the range of 100°C or higher and 300°C or lower under atmospheric pressure.
- the boiling point of the compound represented by formula (1) is more preferably in the range of 120° C. or higher and 280° C. or lower under atmospheric pressure, and even more preferably in the range of 140° C. or higher and 260° C. or lower under atmospheric pressure. be.
- the compound represented by formula (1) used in the present embodiment preferably has a boiling point in the range of 80° C. or higher and 200° C. or lower under a pressure of 0.2 kPa, and 120° C. or higher under a pressure of 1.3 kPa. It preferably has a boiling point in the range of 300° C. or less.
- the compound represented by formula (1) having a boiling point within the above range, when the conductive paste is heated, the compound represented by formula (1) reacts with the surface treatment agent present on the surface of the silver powder. The interaction is enhanced, the detachment of the surface treatment agent from the surface of the silver powder is promoted, and as a result the sinterability of the silver powder is improved.
- R 1 is a (meth)acryloyl group.
- compounds of formula (1) are those in which R 1 is a hydroxymethyl group.
- the compounds of formula (1) are those in which n is 1.
- the compound represented by formula (1) preferably exists in the form dissolved or dispersed in the diluent described below.
- the presence of the compound represented by formula (1) dissolved or dispersed in the diluent can further enhance the action of the compound represented by formula (1) on the surface treatment agent present on the surface of the silver powder. .
- the content of the compound represented by formula (1) in the conductive paste is, for example, 0.1% by mass or more and 10% by mass or less, preferably 0.5% by mass, with respect to the entire conductive paste. It is 5% by mass or more, and more preferably 1% by mass or more and 3% by mass or less. When the content of the compound represented by formula (1) is within the above range, the effect of the adhesion of the conductive paste to the supporting member can be obtained more remarkably.
- the conductive paste of the present embodiment contains a diluent in order to give the conductive paste an appropriate viscosity in consideration of the applicability to the supporting member and the filling property in the details.
- a diluent a reactive diluent or a non-reactive solvent can be used.
- the reactive diluent is a polymerizable monomer that cures by heat treatment and promotes aggregation of silver particles, or a thermosetting resin as a binder resin in the conductive paste, It means a compound having a reactive group that participates in a cross-linking reaction with this resin.
- a non-reactive solvent means a solvent that does not have a polymerizable or crosslinkable reactive group and that can be volatilized by heat treatment.
- polymerizable monomers used as reactive diluents include glycol monomers, acrylic monomers, epoxy monomers, maleimide monomers, and imide monomers.
- Glycol monomers used as polymerizable monomers include, for example, ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol mono-isopropyl ether, ethylene glycol mono-n-butyl ether, Ethylene glycol monoisobutyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-2-ethylhexyl ether, ethylene glycol monoallyl ether, ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, diethylene glycol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono n-propyl ether, diethylene glycol monoisopropyl ether, diethylene glycol mono n-butyl ether, diethylene glycol monoisobutyl ether, diethylene glycol monohexyl ether
- the silver particles contained in the paste agglomerate to favorably form a silver particle-linked structure.
- tripropylene glycol mono-n-butyl ether or ethylene glycol mono-n is used as the glycol monomer.
- -Butyl acetate is preferably used.
- acrylic monomer used as the polymerizable monomer a monofunctional acrylic monomer having only one (meth)acrylic group or a polyfunctional acrylic monomer having two or more (meth)acrylic groups can be used.
- monofunctional acrylic monomers examples include 2-phenoxyethyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, isoamyl (meth) Acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, n-lauryl (meth) acrylate, n-tridecyl (meth) acrylate, n-stearyl (meth) acrylate, isostearyl (meth) acrylate, ethoxydiethylene glycol ( meth) acrylate, butoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, 2-ethylhexyl diethylene glycol (meth) acrylate, methoxypolyethylene glycol
- 2-phenoxyethyl methacrylate is preferably used as the monofunctional acrylic monomer. Thereby, the adhesion of the obtained conductive paste to the supporting member can be improved.
- polyfunctional acrylic monomers include ethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, propoxylated bisphenol A di(meth)acrylate, hexane-1,6-diol bis(2-methyl (meth)acrylate), 4,4′-isopropylidenediphenol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,6-bis((meth)acryloyloxy)-2,2, 3,3,4,4,5,5-octafluorohexane, 1,4-bis((meth)acryloyloxy)butane, 1,6-bis((meth)acryloyloxy)hexane, triethylene glycol di(meth) ) acrylate, neopentyl glycol di(meth)acrylate, N,N'-di(meth)acryloylethylenediamine, N,N'-(1,2-dihydroxyethylene)bis
- epoxy monomer used as the polymerizable monomer a monofunctional epoxy monomer having only one epoxy group or a polyfunctional epoxy monomer having two or more epoxy groups can be used.
- monofunctional epoxy monomers examples include 4-tert-butylphenyl glycidyl ether, m,p-cresyl glycidyl ether, phenyl glycidyl ether, and cresyl glycidyl ether.
- monofunctional epoxy monomer one or a combination of two or more of the above specific examples can be used.
- Polyfunctional epoxy monomers include bisphenol compounds such as bisphenol A, bisphenol F and biphenol, or derivatives thereof; diols having an alicyclic structure or derivatives thereof; aliphatic diols such as butanediol, hexanediol, octanediol, nonanediol, decanediol, or difunctional epoxidized derivatives thereof; trihydroxyphenylmethane skeleton, trifunctional ones having an aminophenol skeleton; polyfunctional ones obtained by epoxidizing phenol novolak resins, cresol novolak resins, phenol aralkyl resins, biphenyl aralkyl resins, naphthol aralkyl resins, and the like.
- the polyfunctional epoxy monomer one or a combination of two or more of the above specific examples can be used.
- maleimide monomers used as polymerizable monomers include polytetramethylene ether glycol-di(2-maleimide acetate).
- imide monomers used as polymerizable monomers include acid anhydrides such as pyromellitic dianhydride and diamines such as 4,4'-diaminodiphenyl ether.
- the content of the polymerizable monomer in the conductive paste is preferably 3% by mass or more, more preferably 4% by mass or more, relative to the entire conductive paste.
- the content of the polymerizable monomer in the conductive paste is preferably 20% by mass or less, more preferably 15% by mass or less, relative to the entire conductive paste.
- the conductive paste of this embodiment may contain a non-reactive solvent.
- a non-reactive solvent By including a non-reactive solvent, it is possible to adjust the fluidity of the conductive paste to be obtained, and to improve the handleability and workability.
- Non-reactive solvents include ethyl alcohol, propyl alcohol, butyl alcohol, pentyl alcohol, hexyl alcohol, heptyl alcohol, octyl alcohol, nonyl alcohol, decyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether.
- ethylene glycol monobutyl ether propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, methylmethoxybutanol, ⁇ -terpineol, ⁇ -terpineol, hexylene glycol, benzyl alcohol, 2-phenyl Alcohols such as ethyl alcohol, isopalmityl alcohol, isostearyl alcohol, lauryl alcohol, ethylene glycol, propylene glycol or glycerin; acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, diacetone alcohol (4-hydroxy-4-methyl-2 -pentanone), 2-octanone, isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) or ketones such as diisobutyl ketone (2,6-di
- the conductive paste of this embodiment does not have to contain a non-reactive solvent.
- not containing a non-reactive solvent means substantially not containing a non-reactive solvent, and refers to the case where the content of the non-reactive solvent is 0.1% by mass or less with respect to the entire conductive paste.
- the conductive paste of this embodiment may contain a thermosetting resin as a binder resin, if necessary.
- a thermosetting resin one or more selected from cyanate resins, epoxy resins, resins having two or more radically polymerizable carbon-carbon double bonds in one molecule, allyl resins, and maleimide resins. can be used.
- Epoxy resins used in the present embodiment include, for example, biphenyl type epoxy resins; bisphenol type epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, tetramethylbisphenol F type epoxy resin; stilbene type epoxy resin; phenol novolac type epoxy resins, novolak type epoxy resins such as cresol novolak type epoxy resins; triphenolmethane type epoxy resins, multifunctional epoxy resins such as alkyl-modified triphenolmethane type epoxy resins; phenol aralkyl type epoxy resins having a phenylene skeleton, biphenylene skeletons Aralkyl-type epoxy resins such as phenol aralkyl-type epoxy resins; dihydroxynaphthalene-type epoxy resins, napht
- the epoxy resin for example, among compounds containing two or more glycidyl groups in one molecule, bisphenol compounds such as bisphenol A, bisphenol F, biphenol or derivatives thereof, hydrogenated bisphenol A, hydrogenated bisphenol F, Diols having an alicyclic structure such as hydrogenated biphenol, cyclohexanediol, cyclohexanedimethanol, and cyclohexanediethanol, or their derivatives, aliphatic diols such as butanediol, hexanediol, octanediol, nonanediol, and decanediol, or their derivatives, etc. can also be used.
- the epoxy resin as the thermosetting resin can contain one or more selected from those exemplified above.
- the conductive paste from the viewpoint of improving the coating workability and adhesiveness of the obtained conductive paste, it is more preferable to contain a bisphenol type epoxy resin, and it is particularly preferable to contain a bisphenol F type epoxy resin. Moreover, in the present embodiment, from the viewpoint of more effectively improving the workability of applying the conductive paste, it is more preferable to include a liquid epoxy resin that is liquid at room temperature (25° C.).
- the cyanate resin used as the thermosetting resin is not particularly limited, but examples include 1,3-dicyanatobenzene, 1,4-dicyanatobenzene, 1,3,5-tricyanatobenzene, 1,3-dicyanatonaphthalene. , 1,4-dicyanatonaphthalene, 1,6-dicyanatonaphthalene, 1,8-dicyanatonaphthalene, 2,6-dicyanatonaphthalene, 2,7-dicyanatonaphthalene, 1,3,6-tricyanatonaphthalene , 4,4′-dicyanatobiphenyl, bis(4-cyanatophenyl)methane, bis(3,5-dimethyl-4-cyanatophenyl)methane, 2,2-bis(4-cyanatophenyl)propane, 2,2-bis(3,5-dibromo-4-cyanatophenyl)propane, bis(4-cyanatophenyl)ether, bis(4-cyanatophenyl)thio
- the resin having two or more radically polymerizable carbon-carbon double bonds in one molecule used as a thermosetting resin includes, for example, a radically polymerizable acrylic resin having two or more (meth)acryloyl groups in the molecule.
- the acrylic resin may contain a compound having a (meth)acrylic group, which is polyether, polyester, polycarbonate, or poly(meth)acrylate having a molecular weight of 500 to 10,000.
- the thermally conductive paste contains a polymerization initiator such as a thermal radical polymerization initiator. be able to.
- Allyl resins used as thermosetting resins include allyl ester resins obtained by reacting a dicarboxylic acid, allyl alcohol, and a compound having an allyl group.
- the above dicarboxylic acids specifically include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, and the like.
- the dicarboxylic acid among the above specific examples, one or a combination of two or more thereof can be used.
- allyl group-containing compound examples include allyl group-containing polyethers, polyesters, polycarbonates, polyacrylates, polymethacrylates, polybutadiene, butadiene-acrylonitrile copolymers, and the like.
- compound having an allyl group one or a combination of two or more of the above specific examples can be used.
- a polymer of bis(2-propenyl) 1,2-cyclohexanedicarboxylate and propane-1,2-diol can be used as the allyl resin.
- the maleimide resin used as the thermosetting resin is not particularly limited, but examples include N,N'-(4,4'-diphenylmethane)bismaleimide, bis(3-ethyl-5-methyl-4-maleimidophenyl)methane, It may contain one or more selected from bismaleimide resins such as 2,2-bis[4-(4-maleimidophenoxy)phenyl]propane.
- the thermosetting resin can contain an epoxy resin having a biphenyl skeleton (biphenyl-type epoxy resin) as a resin having a biphenyl skeleton. Thereby, the metal adhesion of the conductive paste can be improved.
- the structure of the epoxy resin having a biphenyl skeleton is not particularly limited as long as it has a biphenyl skeleton in its molecular structure and has two or more epoxy groups. are treated with epichlorohydrin, phenol aralkyl epoxy resins having a biphenylene skeleton, and naphthol aralkyl epoxy resins having a biphenylene skeleton. good.
- epoxy resins having two epoxy groups in the molecule are particularly preferable because they have excellent heat resistance.
- epoxy resins examples include bifunctional epoxy resins obtained by treating biphenol derivatives with epichlorohydrin, such as biphenyl-type epoxy resins and tetramethylbiphenyl-type epoxy resins; Those having two groups (sometimes expressed as having two phenolic nuclei); those having two epoxy groups among naphthol aralkyl type resins having a biphenylene skeleton; and the like.
- the lower limit of the content of the thermosetting resin is, for example, 1% by mass or more with respect to the entire conductive paste, and preferably It is 3% by mass or more, more preferably 5% by mass or more.
- the handleability of the conductive paste can be improved.
- the viscosity of the conductive paste can be adjusted to a level suitable for use.
- the upper limit of the content of the thermosetting resin is, for example, 15% by mass or less, preferably 12% by mass or less, and more preferably 10% by mass or less with respect to the entire conductive paste. As a result, it is possible to improve the balance of various properties such as the conductivity of the conductive paste and the adhesion to the supporting member.
- the conductive paste of this embodiment may contain a curing agent. Thereby, the curability of the conductive paste can be improved.
- a curing agent for example, one or more selected from aliphatic amines, aromatic amines, dicyandiamides, dihydrazide compounds, acid anhydrides, and phenolic compounds can be used. Among these, containing at least one of dicyandiamide and a phenol compound is particularly preferable from the viewpoint of improving production stability.
- Dihydrazide compounds used as curing agents include carboxylic acid dihydrazide such as adipic acid dihydrazide, dodecanoic acid dihydrazide, isophthalic acid dihydrazide, and p-oxybenzoic acid dihydrazide.
- Acid anhydrides used as curing agents include phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, dodecenylsuccinic anhydride, a reaction product of maleic anhydride and polybutadiene, anhydride Examples include copolymers of maleic acid and styrene.
- a phenolic compound used as a curing agent is a compound that has two or more phenolic hydroxyl groups in one molecule.
- the number of phenolic hydroxyl groups in one molecule is more preferably 2 to 5, and the number of phenolic hydroxyl groups in one molecule is particularly preferably 2 or 3.
- phenol compounds examples include bisphenol F, bisphenol A, bisphenol S, tetramethylbisphenol A, tetramethylbisphenol F, tetramethylbisphenol S, dihydroxydiphenyl ether, dihydroxybenzophenone, tetramethylbiphenol, ethylidenebisphenol, and methylethylidenebis(methylphenol).
- cyclohexylidenebisphenol biphenol and other bisphenols and their derivatives
- trifunctional phenols and their derivatives such as tri(hydroxyphenyl)methane and tri(hydroxyphenyl)ethane, phenol novolacs, cresol novolaks and other phenols and It can contain one or more selected from compounds obtained by reacting formaldehyde, which are mainly binuclear or trinuclear, and derivatives thereof.
- formaldehyde which are mainly binuclear or trinuclear, and derivatives thereof.
- it is more preferable to contain bisphenols it is particularly preferable to contain bisphenol F.
- a phenol resin (phenol compound) having a biphenyl skeleton can be used as the resin having a biphenyl skeleton as the curing agent.
- the structure of the phenol resin having a biphenyl skeleton is not particularly limited as long as it has a biphenyl skeleton in its molecular structure and has two or more phenol groups.
- the content of the curing agent in the conductive paste is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, relative to the entire thermally conductive paste. Thereby, the curability of the conductive paste can be improved more effectively.
- the content of the curing agent in the conductive paste is preferably 10% by mass or less, more preferably 7% by mass or less, relative to the entire conductive paste. This makes it possible to improve the low thermal expansion property and moisture resistance of the adhesive layer formed using the conductive paste.
- the conductive paste of the present embodiment may, if necessary, contain various additional components commonly used in this field.
- Further components include, but are not limited to, silane coupling agents, curing accelerators, radical polymerization initiators, stress reducing agents, inorganic fillers, and the like, and can be selected according to desired performance.
- silane coupling agent is used to improve the adhesion between the conductive paste and the supporting member.
- silane coupling agents include vinylsilanes such as vinyltrimethoxysilane and vinyltriethoxysilane; 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane, 3-glycidide; epoxysilanes such as xypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane; styryls such as p-styryltrimethoxysilane; silane; methacrylsilanes such as 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyl
- aminosilane aminosilane; isocyanurate silane; alkylsilane; ureidosilane such as 3-ureidopropyltrialkoxysilane; mercaptosilane such as 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane; isocyanate silane and the like.
- the curing accelerator is used to accelerate the reaction between the epoxy monomer used as the polymerizable monomer or the epoxy resin used as the binder resin and the curing agent.
- curing accelerators include phosphorus atom-containing compounds such as organic phosphines, tetrasubstituted phosphonium compounds, phosphobetaine compounds, adducts of phosphine compounds and quinone compounds, adducts of phosphonium compounds and silane compounds; dicyandiamide, 1, amidines and tertiary amines such as 8-diazabicyclo[5.4.0]undecene-7 and benzyldimethylamine; and nitrogen atom-containing compounds such as quaternary ammonium salts of the above amidines or tertiary amines.
- azo compounds, peroxides, and the like can be used as radical polymerization initiators.
- silicone compounds such as silicone oil and silicone rubber
- polybutadiene compounds such as polybutadiene maleic anhydride adducts
- acrylonitrile-butadiene copolymer compounds and the like can be used.
- inorganic fillers include fused silica such as fused crushed silica and fused spherical silica; silica such as crystalline silica and amorphous silica; silicon dioxide; alumina; aluminum hydroxide;
- the method for preparing the conductivity is not particularly limited, but for example, after pre-mixing the respective components described above, the mixture is kneaded using three rolls and then vacuum defoamed to obtain a paste-like composition. can. At this time, the long-term workability of the conductive paste can be improved by appropriately adjusting the preparation conditions, for example, performing premixing under reduced pressure.
- the viscosity of the conductive paste of this embodiment can be adjusted according to the application.
- the viscosity of the conductive paste can be controlled by adjusting the type of binder resin to be used, the type of diluent, the blending amount thereof, and the like.
- the lower limit of the viscosity of the conductive paste of the present embodiment is, for example, 10 Pa ⁇ s or more, preferably 20 Pa ⁇ s or more, and more preferably 30 Pa ⁇ s or more. Thereby, the workability of the conductive paste can be improved.
- the upper limit of the viscosity of the conductive paste is, for example, 1 ⁇ 10 3 Pa ⁇ s or less, preferably 5 ⁇ 10 2 Pa ⁇ s or less, and more preferably 2 ⁇ 10 2 Pa ⁇ s or less. is. Thereby, coatability can be improved.
- the conductive paste according to this embodiment is used, for example, to bond a substrate and a semiconductor element.
- semiconductor elements include semiconductor packages and LEDs.
- the conductive paste according to the present embodiment can improve connection reliability and appearance as compared with conventional paste adhesive compositions. As a result, it can be suitably used for mounting a semiconductor element that generates a large amount of heat on a substrate.
- LED shows a light emitting diode (Light Emitting Diode).
- LEDs include shell-type LEDs, surface mount device (SMD) LEDs, COB (Chip On Board), and Power LEDs.
- SMD surface mount device
- COB Chip On Board
- CMOS image sensor As the types of the semiconductor package, specifically, CMOS image sensor, hollow package, MAP (Mold Array Package), QFP (Quad Flat Package), SOP (Small Outline Package), CSP (Chip Size Package), QFN (Quad Flat Non-leaded Package), SON (Small Outline Non-leaded Package), BGA (Ball Grid Array), LF-BGA (Lead Flame BGA), FC-BGA (Flip Chipped BGA), MAP-BGA (Mold Array Process BGA), eWLB (Embedded Wafer-Level BGA), Fan-In type eWLB, and Fan-Out type eWLB.
- FIG. 1 is a cross-sectional view showing an example of a semiconductor device according to this embodiment.
- a semiconductor device 100 according to this embodiment includes a support member 30 and a semiconductor element 20 mounted on the support member 30 via an adhesive layer 10 that is a cured product of conductive paste.
- Semiconductor element 20 and support member 30 are electrically connected, for example, via bonding wires 40 or the like.
- the semiconductor element 20 is sealed with a sealing resin 50, for example.
- the lower limit of the thickness of the adhesive layer 10 is preferably, for example, 5 ⁇ m or more, more preferably 10 ⁇ m or more. Thereby, the heat capacity of the cured product of the conductive paste can be improved, and the heat dissipation can be improved.
- the upper limit of the thickness of the adhesive layer 10 is preferably, for example, 50 ⁇ m or less, and more preferably 30 ⁇ m or less. As a result, the conductive paste can exhibit suitable adhesion while improving heat dissipation.
- the support member 30 is, for example, a lead frame.
- the semiconductor element 20 is mounted on the die pad 32 or the support member 30 with the adhesive layer 10 interposed therebetween. Also, the semiconductor element 20 is electrically connected to the outer leads 34 (supporting member 30) via bonding wires 40, for example.
- the support member 30, which is a lead frame, is composed of, for example, a 42 alloy Cu frame.
- the support member 30 may be an organic substrate or a ceramic substrate.
- the organic substrate is preferably made of, for example, epoxy resin, cyanate resin, maleimide resin, or the like.
- the surface of the support member 30 may be coated with metal such as silver or gold. Thereby, the adhesiveness between the adhesive layer 10 and the support member 30 can be improved.
- FIG. 2 is a modification of FIG. 1, and is a cross-sectional view showing an example of the semiconductor device 100 according to this embodiment.
- support member 30 is, for example, an interposer.
- a plurality of solder balls 52 are formed on the other surface of the supporting member 30, which is an interposer, opposite to the one surface on which the semiconductor element 20 is mounted. In this case, the semiconductor device 100 will be connected to another wiring board through the solder balls 52 .
- a conductive paste is applied onto the support member 30, and then the semiconductor element 20 is arranged thereon. That is, the supporting member 30, the paste adhesive composition, and the semiconductor element 20 are laminated in this order.
- the method for applying the conductive paste is not limited, specifically, dispensing, printing, ink-jetting, and the like can be used.
- the conductive paste is cured by pre-curing and then post-curing the conductive paste.
- heat treatment such as pre-curing and post-curing
- the silver particles in the conductive paste are aggregated to form a thermally conductive layer in the adhesive layer 10 in which the interfaces between the silver particles disappear.
- the supporting member 30 and the semiconductor element 20 are adhered via the adhesive layer 10 .
- the semiconductor element 20 and the support member 30 are electrically connected using bonding wires 40 .
- the semiconductor element 20 is sealed with the sealing resin 50 . Thereby, a semiconductor device can be manufactured.
- a varnish-like resin composition was prepared by kneading the components in the blending amounts described in Table 1, "Composition of varnish-like resin composition", at room temperature using a three-roll mill.
- the obtained varnish-like resin composition was used in the amount described in Table 1, "Composition of paste-like adhesive composition", mixed with silver powder, and kneaded in a three-roll mill at room temperature.
- a paste composition (conductive paste) was obtained.
- the following items were measured for the conductive pastes of each example and each comparative example. Table 1 shows the results. ⁇ Thermal conductivity> The resulting paste resin composition was applied to a Teflon plate, heated from 30° C. to 200° C. over 60 minutes in a nitrogen atmosphere, and then heat-treated at 200° C. for 120 minutes. As a result, a heat-treated test piece of the pasty resin composition having a thickness of 1 mm was obtained ("Teflon" is a registered trademark for fluororesin). Then, the thermal diffusion coefficient ⁇ in the thickness direction of the heat-treated body was measured by the laser flash method. The measurement temperature was 25°C. Also, the specific heat Cp was measured by differential scanning calorimetry (DSC).
- DSC differential scanning calorimetry
- thermal conductivity ⁇ [W/(m K)] ⁇ [m 2 /sec] x Cp [J/kg K] x ⁇ [g/cm 3 ]
- the resin compositions of Examples containing the compound of formula (1) promote sintering of the silver powder contained therein, and thus have high thermal conductivity.
- semiconductor device 100 semiconductor device 10 adhesive layer 20 semiconductor element 30 support member 32 die pad 34 outer lead 40 bonding wire 50 sealing resin 52 solder ball 200 copper frame 210 conductive paste 220 silicon chip 230 jig
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Abstract
Description
銀粉と、
一般式(1)で表される化合物と、
R1-(シクロヘキシル)-(CH2)n-OH (1)
(式(1)において、nは、0~4の整数であり、R1は、水素原子、水酸基、炭素数1~6の有機基、または水酸基で置換された炭素数1~6の有機基である)
希釈剤と、
を含む導電性ペーストが提供される。
支持部材と、
前記支持部材上に接着層を介して搭載された半導体素子と、を備え、
前記接着層は、上記導電性ペーストからなる、半導体装置が提供される。
本実施形態の導電性ペーストは、半導体素子等の電子部品を、リードフレームまたは配線基板等の支持部材に接着するためのダイアタッチ層を形成するために用いられるダイアタッチペーストである。本実施形態の導電性ペーストは、導電性金属粉である銀粉と、一般式(1)で表される化合物と、希釈剤とを含む。
R1-(シクロヘキシル)-(CH2)n-OH (1)
式(1)において、nは、0~4の整数であり、R1は、水素原子、水酸基、炭素数1~6の有機基、または水酸基で置換された炭素数1~6の有機基である。
(銀粉)
本実施形態の導電性ペーストに含まれる銀粉は、導電性ペーストに対して熱処理が施されることにより、凝集して銀粒子連結構造を形成する。すなわち、導電性ペーストを加熱して得られるダイアタッチペースト層において、銀粉同士は互いに凝集して存在する。これにより、導電性や熱伝導性、支持部材への密着性が発現される。
本実施形態の導電性ペーストは、式(1)で表される化合物を含む。
R1-(シクロヘキシル)-(CH2)n-OH (1)
式(1)において、nは、0~4の整数であり、好ましくは、1~3の整数であり、より好ましくは、1または2であり、R1は、水素原子、水酸基、炭素数1~6の有機基、または水酸基で置換された炭素数1~6の有機基である。
本実施形態の導電性ペーストは、良好な焼結性を有し、結果として、高い熱伝導性と高い接着性を有するこれは上述のとおり、銀粉の表面に存在する表面処理剤に対し、式(1)の化合物が作用することに起因すると考えられる。
本実施形態の導電性ペーストは、支持部材への塗布性や細部への充填性を考慮して、導電性ペーストを適切な粘度とするために、希釈剤を含む。希釈剤としては、反応性希釈剤または非反応性溶剤を用いることができる。ここで、反応性希釈剤とは、加熱処理により硬化して、銀粒子の凝集を促進させる重合性単量体、または導電性ペーストにバインダー樹脂としての熱硬化性樹脂が含まれる場合には、この樹脂との架橋反応に関与する反応性基を有する化合物を意味する。非反応性溶剤とは、重合性または架橋性を有する反応基を有していない、加熱処理により揮発し得る溶剤を意味する。
本実施形態の導電性ペーストは、必要に応じて、バインダー樹脂としての熱硬化性樹脂を含んでもよい。熱硬化性樹脂としては、シアネート樹脂、エポキシ樹脂、ラジカル重合性の炭素-炭素二重結合を1分子内に2つ以上有する樹脂、アリル樹脂、およびマレイミド樹脂から選択される一種または二種以上を用いることができる。
また、上記アリル基を備える化合物としては、具体的には、アリル基を備えるポリエーテル、ポリエステル、ポリカーボネート、ポリアクリレート、ポリメタクリレート、ポリブタジエン、ブタジエンアクリロニトリル共重合体などが挙げられる。アリル基を備える化合物としては、上記具体例のうち、1種または2種以上を組み合わせて用いることができる。アリル樹脂としては、具体的には、1,2-シクロヘキサンジカルボン酸ビス(2-プロペニル)とプロパン-1,2-ジオールとの重合体などを用いることができる。
本実施形態の導電性ペーストは、硬化剤を含んでもよい。これにより、導電性ペーストの硬化性を向上させることができる。硬化剤としては、例えば、脂肪族アミン、芳香族アミン、ジシアンジアミド、ジヒドラジド化合物、酸無水物、およびフェノール化合物から選択される一種または二種以上を用いることができる。これらの中でも、ジシアンジアミドおよびフェノール化合物のうちの少なくとも一方を含むことが、製造安定性を向上させる観点から特に好ましい。
本実施形態の導電性ペーストは、上述の成分に加え、必要に応じて、当該分野で通常用いられる種々のさらなる成分を含み得る。さらなる成分としては、シランカップリング剤、硬化促進剤、ラジカル重合開始剤、低応力剤、無機フィラー等が挙げられるが、これらに限定されず、所望の性能に応じて選択することができる。
導電性の調製方法は、特に限定されないが、たとえば上述した各成分を予備混合した後、3本ロールを用いて混練を行い、さらに真空脱泡することにより、ペースト状の組成物を得ることができる。この際、たとえば予備混合を減圧下にて行う等、調製条件を適切に調整することによって、導電性ペーストの長期作業性を向上することができる。
本実施形態の導電性ペーストの用途について説明する。
本実施形態に係る導電性ペーストは、例えば、基板と、半導体素子とを接着するために用いられる。ここで、半導体素子としては、例えば、半導体パッケージ、LEDなどが挙げられる。
本実施形態に係る導電性ペーストは、従来のペースト状接着剤組成物と比べて、接続信頼性と外観とが向上できる。これにより、発熱量が大きい半導体素子を基板に搭載する用途に好適に用いることができる。なお、本実施形態において、LEDとは、発光ダイオード(Light Emitting Diode)を示す。
図1は、本実施形態に係る半導体装置の一例を示す断面図である。
本実施形態に係る半導体装置100は、支持部材30と、導電性ペーストの硬化物である接着剤層10を介して支持部材30上に搭載された半導体素子20とを備える。半導体素子20と支持部材30は、たとえばボンディングワイヤ40等を介して電気的に接続される。また、半導体素子20は、たとえば封止樹脂50により封止される。
本実施形態に係る半導体装置の製造方法の一例について説明する。
まず、支持部材30の上に、導電性ペーストを塗工し、次いで、その上に半導体素子20を配置する。すなわち、支持部材30、ペースト状接着剤組成物、半導体素子20がこの順で積層される。導電性ペーストを塗工する方法としては限定されないが、具体的には、ディスペンシング、印刷法、インクジェット法などを用いることができる。
(熱硬化性樹脂)
-エポキシ樹脂1:ビスフェノール-F-ジグリシジルエーテル(日本化薬社製、RE-303SL、エポキシ当量160g/eq)
(希釈剤)
-エポキシモノマー1:m-グリシジルエーテルとp-グリシジルエーテルとの混合物(阪本薬品工業社製、m,p-CGE、Mw=165、エポキシ当量165g/eq)
(硬化剤)
-硬化剤1:ジヒドロキシジフェニルメタン(DIC社製、DIC-BPF)
-硬化剤2:ジシアンアミド(ADEKA社製、EH-3636AS)
(硬化促進剤)
-硬化促進剤1:イミダゾール(四国化成工業社製、キュアゾール2PZ-PW)
(添加剤)
-添加剤1:1,4-シクロヘキサンジメタノールモノアクリレート(CHDMMA、沸点:140℃/2mmHg、三菱ケミカル製)
-添加剤2:p-シクロヘキサンジメタノール(沸点:162℃/1.3kPa、東京化成工業株式会社製)
-添加剤3:p-ジメチルシクロヘキサン(沸点:120℃、東京化成工業株式会社製)
-添加剤4:2-ヒドロキシエチルメタクリレート(沸点:85℃/0.7kPa、東京化成社製)
-添加剤5:プロピレングリコールモノフェニルエーテル(沸点:244℃、日本乳化剤社製)
-添加剤6:ジエチレングリコール(沸点:245℃、東京化成社製)
-添加剤7:トリエチレングリコール(沸点:276℃、東京化成社製)
-添加剤8:ポリエチレングリコール(平均分子量:260~340、東京化成社製、PEG300)
(導電性金属粉)
-銀粉1:球状銀粉(平均粒径:0.7μm、DOWAハイテック社製、AG-DSB-114)
-銀粉2:フレーク状銀粉(平均粒径:2.0μm、福田金属箔粉工業製、HKD-16)
<ペースト状接着剤組成物の作製>
まず表1の「ワニス状樹脂組成物の組成」に記載の配合量の成分を、常温で、3本ロールミルで混練することにより、ワニス状樹脂組成物を作製した。次いで、得られたワニス状樹脂組成物を、表1の「ペースト状接着剤組成物の組成」に記載の配合量で用い、銀粉を混合し、常温で、3本ロールミルで混練することにより、ペースト状の組成物(導電性ペースト)を得た。
<熱伝導率>
得られたペースト状樹脂組成物を、テフロン板上に塗布し、窒素雰囲気下で、30℃から200℃まで60分間かけて昇温し、続けて200℃で120分間熱処理した。これにより、厚さ1mmの、ペースト状樹脂組成物の熱処理後の試験片を得た(「テフロン」は、フッ素樹脂に関する登録商標である)。
次いで、レーザーフラッシュ法により、熱処理体の厚み方向の熱拡散係数αを測定した。測定温度は25℃とした。
また、示差走査熱量(Differential scanning calorimetry:DSC)測定により、比熱Cpを測定した。
さらに、JIS K 6911に準拠して、密度ρを測定した。
これらの値を用いて、以下の式に基づいて、熱伝導率λを算出した。
熱伝導率λ[W/(m・K)]=α[m2/sec]×Cp[J/kg・K]×ρ[g/cm3]
上述ペースト状樹脂組成物の熱処理後の試験片を、SAT(超音波探傷)により観察し、テフロン板と樹脂層との界面に生じる剥離の有無を確認した。結果を、以下の評価基準で表1に示す。
OK:剥離が全く観察されない。
NG:剥離が観察される。
得られたペースト状樹脂組成物を、テフロン板上に塗布し、30℃から200℃まで60分間かけて昇温し、続けて200℃で120分間熱処理した。これにより、厚さ0.3mmの、熱伝導性組成物の熱処理後の試験片を得た。
得られた熱処理体をテフロン板から剥がして、測定装置(日立ハイテクサイエンス社製、DMS6100)にセットし、引張モード、周波数1Hzでの動的粘弾性測定(DMA)を行った。これにより、25℃における貯蔵弾性率E'(MPa)を測定した。
10 接着剤層
20 半導体素子
30 支持部材
32 ダイパッド
34 アウターリード
40 ボンディングワイヤ
50 封止樹脂
52 半田ボール
200 銅フレーム
210 導電性ペースト
220 シリコンチップ
230 治具
Claims (11)
- 銀粉と、
一般式(1)で表される化合物と、
R1-(シクロヘキシル)-(CH2)n-OH (1)
(式(1)において、nは、0~4の整数であり、R1は、水素原子、水酸基、炭素数1~6の有機基、または水酸基で置換された炭素数1~6の有機基である)
希釈剤と、
を含む導電性ペースト。 - 前記式(1)で表される化合物において、R1が(メタ)アクリロイル基である、請求項1に記載の導電性ペースト。
- 前記式(1)で表される化合物において、R1がヒドロキシメチル基である、請求項1に記載の導電性ペースト。
- 前記式(1)で表される化合物において、nが1である、請求項1~3のいずれか一項に記載の導電性ペースト。
- 前記式(1)で表される化合物が、当該導電性ペースト全体に対して、5質量%以上50質量%以下の量である、請求項1~4のいずれか一項に記載の導電性ペースト。
- 前記銀粉が、当該導電性ペースト全体に対して、40質量%以上90質量%以下の量である、請求項1~5のいずれか一項に記載の導電性ペースト。
- 熱硬化性樹脂をさらに含む、請求項1~6のいずれか一項に記載の導電性ペースト。
- 反応性希釈剤をさらに含む、請求項1~7のいずれか一項に記載の導電性ペースト。
- 硬化剤をさらに含む、請求項1~8のいずれか一項に記載の導電性ペースト。
- 前記銀粉が、脂肪酸で表面処理された銀粉を含む、請求項1~9のいずれか一項に記載の導電性ペースト。
- 支持部材と、
前記支持部材上に接着層を介して搭載された半導体素子と、を備え、
前記接着層は、請求項1~10のいずれか一項に記載の導電性ペーストからなる、半導体装置。
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JP2011071057A (ja) * | 2009-09-28 | 2011-04-07 | Kyoto Elex Kk | 加熱硬化型導電性ペースト組成物およびその導電性ペースト組成物を用いた電極並びに配線パターンの形成方法 |
WO2012102304A1 (ja) * | 2011-01-26 | 2012-08-02 | ナミックス株式会社 | 導電性ペースト及びその製造方法 |
JP2013249390A (ja) * | 2012-05-31 | 2013-12-12 | Sumitomo Bakelite Co Ltd | 熱硬化性樹脂組成物および半導体装置 |
JP2016072595A (ja) * | 2014-09-30 | 2016-05-09 | ニホンハンダ株式会社 | 発光ダイオード装置の製造方法 |
JP2018190540A (ja) * | 2017-04-28 | 2018-11-29 | 日亜化学工業株式会社 | 金属粉焼結ペースト及びその製造方法、ならびに導電性材料の製造方法 |
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JP4946130B2 (ja) * | 2006-03-28 | 2012-06-06 | 住友ベークライト株式会社 | 導電性ペースト及び導電性ペーストを使用して作製した半導体装置 |
JP5750259B2 (ja) | 2010-11-30 | 2015-07-15 | ハリマ化成株式会社 | 導電性金属ペースト |
JP6190653B2 (ja) * | 2013-07-26 | 2017-08-30 | 京セラ株式会社 | 導電性樹脂組成物および半導体装置 |
CN111801397B (zh) * | 2018-03-01 | 2021-08-20 | 住友电木株式会社 | 糊状粘接剂组合物和半导体装置 |
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JP2011071057A (ja) * | 2009-09-28 | 2011-04-07 | Kyoto Elex Kk | 加熱硬化型導電性ペースト組成物およびその導電性ペースト組成物を用いた電極並びに配線パターンの形成方法 |
WO2012102304A1 (ja) * | 2011-01-26 | 2012-08-02 | ナミックス株式会社 | 導電性ペースト及びその製造方法 |
JP2013249390A (ja) * | 2012-05-31 | 2013-12-12 | Sumitomo Bakelite Co Ltd | 熱硬化性樹脂組成物および半導体装置 |
JP2016072595A (ja) * | 2014-09-30 | 2016-05-09 | ニホンハンダ株式会社 | 発光ダイオード装置の製造方法 |
JP2018190540A (ja) * | 2017-04-28 | 2018-11-29 | 日亜化学工業株式会社 | 金属粉焼結ペースト及びその製造方法、ならびに導電性材料の製造方法 |
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