JP5700504B2 - 半導体装置接合材 - Google Patents
半導体装置接合材 Download PDFInfo
- Publication number
- JP5700504B2 JP5700504B2 JP2010176456A JP2010176456A JP5700504B2 JP 5700504 B2 JP5700504 B2 JP 5700504B2 JP 2010176456 A JP2010176456 A JP 2010176456A JP 2010176456 A JP2010176456 A JP 2010176456A JP 5700504 B2 JP5700504 B2 JP 5700504B2
- Authority
- JP
- Japan
- Prior art keywords
- porous metal
- metal body
- semiconductor device
- bonding
- solder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004065 semiconductor Substances 0.000 title claims description 54
- 239000000463 material Substances 0.000 title claims description 48
- 229910000679 solder Inorganic materials 0.000 claims description 109
- 229910052751 metal Inorganic materials 0.000 claims description 83
- 239000002184 metal Substances 0.000 claims description 83
- 229910052718 tin Inorganic materials 0.000 claims description 44
- 229910045601 alloy Inorganic materials 0.000 claims description 42
- 239000000956 alloy Substances 0.000 claims description 42
- 239000000758 substrate Substances 0.000 claims description 25
- 229910000765 intermetallic Inorganic materials 0.000 claims description 22
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 238000005304 joining Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000010949 copper Substances 0.000 description 44
- 239000000843 powder Substances 0.000 description 18
- 238000002844 melting Methods 0.000 description 14
- 230000008018 melting Effects 0.000 description 14
- 238000005476 soldering Methods 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 239000011800 void material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 2
- 229910017482 Cu 6 Sn 5 Inorganic materials 0.000 description 2
- 229910020836 Sn-Ag Inorganic materials 0.000 description 2
- 229910020888 Sn-Cu Inorganic materials 0.000 description 2
- 229910020988 Sn—Ag Inorganic materials 0.000 description 2
- 229910019204 Sn—Cu Inorganic materials 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910017944 Ag—Cu Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910020220 Pb—Sn Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910020935 Sn-Sb Inorganic materials 0.000 description 1
- 229910008757 Sn—Sb Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 238000009703 powder rolling Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 description 1
- 239000010944 silver (metal) Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000002076 thermal analysis method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
- B23K35/262—Sn as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/08—Soldering by means of dipping in molten solder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
- B23K35/025—Pastes, creams, slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/302—Cu as the principal constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/08—Alloys with open or closed pores
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C13/00—Alloys based on tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/02—Alloys based on copper with tin as the next major constituent
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- 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
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- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3735—Laminates or multilayers, e.g. direct bond copper ceramic substrates
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- H01L24/07—Structure, shape, material or disposition of the bonding areas after the connecting process
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- 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
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/40—Semiconductor devices
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- 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
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/04042—Bonding areas specifically adapted for wire connectors, e.g. wirebond pads
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- H—ELECTRICITY
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- 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
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- 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
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- 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
- H01L2224/291—Material 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
- H01L2224/29101—Material 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 less than 400°C
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- H01L2224/2919—Material with a principal constituent of the material being a polymer, e.g. polyester, phenolic based polymer, epoxy
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- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
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- 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
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- 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
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- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
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- H01L2224/3201—Structure
- H01L2224/32012—Structure relative to the bonding area, e.g. bond pad
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- H01L2224/321—Disposition
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- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
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- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Powder Metallurgy (AREA)
Description
半導体装置の内部接合に用いられる高温はんだには、Pb−10Sn(固相線温度268℃、液相線温度302℃)、Pb−5Sn(固相線温度307℃、液相線温度313℃)、Pb−2Ag−8Sn(固相線温度275℃、液相線温度346℃)、Pb−5Ag(固相線温度304℃、液相線温度365℃)などがあり、主にPbが主成分となっている。これらの高温はんだは、いずれも固相線温度が260℃以上である。そのため、プリント基板の実装用はんだ付けに、例えば63Sn−37Pb共晶はんだを使用する場合、そのときのはんだ付け温度が少し高めの230℃になっても、Pb−10Snなどの高温はんだではんだ付けした半導体装置の内部接合のはんだ付け部は、プリント基板への実装はんだ付け時に溶融することがない。
当然、従来の半導体装置の内部接合に使用されてきた前述のようなPb−Sn系高温はんだについても、Pbフリーはんだ合金の使用が求められている。
この高温はんだ合金を使用しない接合技術として検討されたのは、Sn主成分の鉛フリーはんだと比較して溶融温度の高い金属間化合物で接合する方法である。
さらに本発明の課題は、基板に実装するときにも内部接合部が溶融しない半導体装置を提供することである。
さらに、本発明によれば、はんだ粉末を使用して金属間化合物を形成する接合材に比較して、ボイドの少ない信頼性の高い内部接合部を得ることができる。
このように内部接合された半導体装置は、さらにプリント配線基板などに実装されて、電源装置などの電子機器を構成する。
本発明の接合機構:
本発明によれば、半導体装置を構成する半導体素子と基板との接合部に、Snの金属間化合物を形成させる。網目状構造を有する多孔質金属に溶融充填されたSnまたはSn系の鉛フリーはんだと多孔質金属体を構成する金属との反応、さらには、上記鉛フリーはんだとCuもしくはNiめっきとの反応によって接合部が形成される。これらの反応は、それぞれ、溶融はんだ合金を多孔質金属体に含浸させるとき、および内部接合を行うときに生じる。
本発明において使用する多孔質金属体は、市販のものを出発材料として利用すればよい。市販品を、必要により、所定厚さにまで圧延するとともに、空孔率を調整すればよい。
本発明の場合、多孔質体を構成する孔は、多孔質体表面と連通した穴構造を持っており、網目状構造を有することから、溶融はんだ浴にこの多孔質体を浸漬するだけで孔構造の内部にまではんだを含浸させることができる。真空雰囲気でこのような含浸処理を行えば、より効率的に内部にまで溶融はんだを含浸させることができる。
本発明にかかる接合材は、薄板状に構成されるが、使用に際しては、所定形状に切断されて、いわゆるはんだプリフォームと同様の態様で使用される。すなわち、本発明にかかる接合材は、接合面の間に介在させて組み立て、これをリフロー炉で加熱することではんだ接合が行われる。そのため、好ましくは、本発明に係る接合材は、上記多孔質金属体の板厚さが0.1mm以上、0.2mm以下である。本発明に使用する網目状構造を有する多孔質金属体の空孔率、つまりはんだ合金の充填率は、20〜30%のものが好ましい。
福田金属製リン青銅粉末(商品名P−201)を880℃の還元雰囲気において焼結させ、多孔質金属体(板長さ:1m、幅:15mm、厚さ:0.1mm、空孔率:25%)を用意し、これを各種はんだ浴に250〜260℃で浸漬し、鉛フリーはんだを含浸させた。溶融はんだの含浸にフラックスは使用せず、はんだ浴に超音波を当てることにより多孔質金属体の酸化皮膜を除去し、ボイド発生を防止した。使用した多孔質体の孔構造は、連続孔が網目上に連通しており、板表面に開口部を備えていた。
図2は、実施例1で使用した接合材の断面顕微鏡組織図(倍率:500倍)である。
多孔質金属体5が、溶融充填されたはんだ合金7によって包囲されているのがわかる。両者のCu6Sn5金属間化合物およびCu3Sn金属間化合物の存在が確認された。しかし、はんだ合金、特に表面部分のはんだ合金はSn単体で存在していることが確認された。
実施例1で製造した接合材から5mm角の接合材を打ち抜き、これを高温炉で10mm角のCu板もしくはNiめっきCu板に接合することで、Sn−Cuの金属間化合物を形成させて、接合部を再現した。
このようにして得られた接合部の金属間化合物の生成量を測定した。測定方法は、日本電子製走査型電子顕微鏡JSM−7000Fを用い、接合部断面から化合物存在領域を検出、検出した面積を計測し、生成した化合物量とした。結果を表2に示す。
実施例1で製造した本発明の接合部材の接合強度及び溶融温度を測定した。
接合強度の測定法は、JIS Z3198−5に準じた。但し、30mm角Cu板の上に本発明の接合材(3mm角の大きさ)を載せ、さらにそのうえに測定片としての3mm角、厚さ1mmのCuチップを載せて、これを加熱接合した。
溶融温度の測定方法は、JIS Z3198−1に準じた。熱分析の条件は、セイコーインスツルメンツ製示差熱分析装置DSC6200を用い、昇温速度5℃/min、180―280℃間における接合加熱後の溶融点を確認した。接合部試料は強度試験に使用したものと同じものを使用した。
結果を表2に示す。
実施例1で製造した接合材(表2の実施例1参照)を用いて、図1に示すように、絶縁板にシリコンチップを接合し、さらにこれをCu基板に接合して半導体装置を構成した。次いで、この半導体装置をプリント基板にリフロ−温度240℃で実装した。
2. ICチップ
3. 絶縁基板
4. ベース基板
5. 多孔質金属体
6. 金属間化合物
7. Pbフリーはんだ
8. バルク状金属体(空孔率0%)
9. 多孔質金属体(空孔率35%以上)
Claims (6)
- 網目構造を有する薄板状の多孔質金属体と、該多孔質金属体の空孔部分に充填され、かつ該多孔質金属体の少なくとも一方の表面を被覆したSnまたはSn系はんだ合金とから構成され、前記多孔質金属体が導電性を示し、前記多孔質金属体が、Snとの反応により金属間化合物を生成するCu、Ni、Ag、およびCu含有量が90質量%以上のCu合金からなる群から選んだ少なくとも1種から構成され、前記多孔質金属体の空孔率が、面積%で、20%以上30%以下であり、該多孔質金属体とその中に溶融充填された前記SnまたはSn系はんだ合金との境界部には金属間化合物が形成されており、かつ前記多孔質金属体の前記表面を被覆するSnまたはSn系はんだ合金の表面部分のSnまたはSn系はんだ合金はSn単体で存在している半導体装置の内部接合に用いる高温はんだ接合材。
- 前記多孔質金属体が、厚さが0.1mm以上0.2mm以下である、請求項1記載の高温はんだ接合材。
- 薄板状の多孔質金属体を、SnまたはSn系はんだ合金溶融浴中に浸漬して、該多孔質金属体を構成する内部から表面に連通した孔構造内に溶融SnまたはSn系はんだ合金を充填し、かつ該多孔質金属体の表面を被覆させること、前記多孔質金属体をSnまたはSn系はんだ合金溶融浴から取り出すこと、そして、前記多孔質金属体に充填されまたそれを被覆する溶融SnまたはSn系はんだ合金を凝固させることからなる、請求項1記載の高温はんだ接合材の製造方法。
- 少なくとも、半導体素子と絶縁基板とを接合するはんだ接合部を備えた半導体装置であって、該はんだ接合部が、請求項1または2記載の高温はんだ接合材を用いて接合されており、前記接合部において、Sn単体が消失していることを特徴とする半導体装置。
- 前記接合部が260℃において溶融しない、請求項4記載の半導体装置。
- 請求1または2記載の高温はんだ接合材を用いて、少なくとも、半導体素子と絶縁基板とを接合する半導体装置の接合方法であって、不活性ガス雰囲気、還元性ガス雰囲気、および減圧雰囲気から選ばれたいずれかの雰囲気下で、300℃以上350℃以下において5分以上加熱させ、フラックスレスで接合を行う、半導体装置の内部接合方法。
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PT11814671T PT2617515T (pt) | 2010-08-05 | 2011-08-03 | Material ligante para dispositivo semicondutor |
EP11814671.1A EP2617515B1 (en) | 2010-08-05 | 2011-08-03 | Semiconductor device bonding material |
CN201180048365.6A CN103153527B (zh) | 2010-08-05 | 2011-08-03 | 半导体装置接合材料 |
DK11814671.1T DK2617515T3 (en) | 2010-08-05 | 2011-08-03 | Binding material for semiconductor device |
US13/261,584 US8896119B2 (en) | 2010-08-05 | 2011-08-03 | Bonding material for semiconductor devices |
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WO2007125861A1 (ja) * | 2006-04-26 | 2007-11-08 | Senju Metal Industry Co., Ltd. | ソルダペースト |
JP2008200728A (ja) * | 2007-02-21 | 2008-09-04 | Mitsubishi Materials Corp | はんだ接合材及びその製造方法並びにこれを用いたパワーモジュール基板 |
JP5140411B2 (ja) * | 2007-12-27 | 2013-02-06 | ローム株式会社 | 半導体装置 |
JP2010047787A (ja) * | 2008-08-19 | 2010-03-04 | Mitsubishi Materials Corp | はんだ含浸シート材の製造方法及び製造装置 |
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CN103153527A (zh) | 2013-06-12 |
JP2012035291A (ja) | 2012-02-23 |
EP2617515B1 (en) | 2018-10-10 |
EP2617515A4 (en) | 2016-06-01 |
US8896119B2 (en) | 2014-11-25 |
DK2617515T3 (en) | 2018-12-17 |
EP2617515A1 (en) | 2013-07-24 |
US20130134591A1 (en) | 2013-05-30 |
KR101496592B1 (ko) | 2015-02-26 |
PT2617515T (pt) | 2018-11-21 |
KR20130043210A (ko) | 2013-04-29 |
WO2012018046A1 (ja) | 2012-02-09 |
CN103153527B (zh) | 2015-12-09 |
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