JP4822155B2 - サブマウント及びその製造方法 - Google Patents
サブマウント及びその製造方法 Download PDFInfo
- Publication number
- JP4822155B2 JP4822155B2 JP2005278958A JP2005278958A JP4822155B2 JP 4822155 B2 JP4822155 B2 JP 4822155B2 JP 2005278958 A JP2005278958 A JP 2005278958A JP 2005278958 A JP2005278958 A JP 2005278958A JP 4822155 B2 JP4822155 B2 JP 4822155B2
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- JP
- Japan
- Prior art keywords
- layer
- solder
- submount
- electrode layer
- adhesion
- 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.)
- Expired - Fee Related
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- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000010410 layer Substances 0.000 claims description 401
- 229910000679 solder Inorganic materials 0.000 claims description 196
- 239000000758 substrate Substances 0.000 claims description 64
- 239000010931 gold Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 23
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 23
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 22
- 239000010936 titanium Substances 0.000 claims description 22
- 229910052737 gold Inorganic materials 0.000 claims description 20
- 229910052719 titanium Inorganic materials 0.000 claims description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 19
- 229910052759 nickel Inorganic materials 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 229910052804 chromium Inorganic materials 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910052750 molybdenum Inorganic materials 0.000 claims description 14
- 229910052697 platinum Inorganic materials 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 description 34
- 230000004888 barrier function Effects 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 20
- 230000008018 melting Effects 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 9
- 239000011651 chromium Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 229910000510 noble metal Inorganic materials 0.000 description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- 229910015363 Au—Sn Inorganic materials 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 5
- 229910052763 palladium Inorganic materials 0.000 description 4
- 238000000206 photolithography Methods 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000007740 vapor deposition Methods 0.000 description 4
- 239000007769 metal material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- 238000005530 etching Methods 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- 229910017980 Ag—Sn Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910007610 Zn—Sn Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/02—Alloys based on gold
-
- 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
- B23K35/22—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
- B23K35/264—Bi 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
- B23K35/22—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
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/282—Zn 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
- B23K35/22—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
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/286—Al 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
- B23K35/22—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
- B23K35/3006—Ag 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
- B23K35/22—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
- B23K35/3013—Au 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
- B23K35/22—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
-
- 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
- B23K35/3033—Ni as the principal 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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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- 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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- 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
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- H—ELECTRICITY
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- 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
- H01L24/80—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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
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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
- H01L2224/04026—Bonding areas specifically adapted for layer connectors
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- H—ELECTRICITY
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- 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
- H01L2224/291—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
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- H—ELECTRICITY
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- 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
- H01L2224/291—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
- H01L2224/29109—Indium [In] as principal constituent
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- H—ELECTRICITY
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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
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- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
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- H01L2224/29099—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
- H01L2224/29111—Tin [Sn] as principal constituent
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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
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- 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
- H01L2224/32225—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 the item being non-metallic, e.g. insulating substrate with or without metallisation
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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
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- H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
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- H01L2224/451—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
- H01L2224/45117—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 greater than or equal to 400°C and less than 950°C
- H01L2224/45124—Aluminium (Al) as principal constituent
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Description
図7は従来の半田バリア層を有するサブマウントの構造を模式的に示す断面図である。図7に示すように、従来のサブマウント50は、サブマウント基板51と、サブマウント基板51の上面、すなわち、半導体装置を搭載する側の面上に形成される密着層52と、その密着層52上に形成される電極層53と、電極層53上に形成される半田バリア層54と、半田バリア層54上に形成される半田層55と、から構成されている。半田バリア層54は、白金(Pt)やパラジウム(Pd)などからなり、電極層53を構成する金の半田層55への拡散を防止し、半田層の融点の上昇などを防止していた。
上記構成において、半田層が、好ましくは、密着層の外周部に接続される重複部を有し、重複部が電極層の上面に電気的に接続される。
また、本発明の別のサブマウントは、サブマウント基板と、サブマウント基板上に形成された第1の密着層と、第1の密着層上に形成された電極層と、第1の密着層及び電極層の一部に開口して形成された半田層埋め込み用の窓部と、窓部に形成された第2の密着層と、第2の密着層上に形成された半田層と、を備え、密着層は、Ti,Ni,Cr,Moの何れか一つを主成分とする材料、又は、Ti,Ni,Cr,Moの何れか一つの合金を主成分とする材料からなり、半田層が、窓部に形成された第2の密着層のみを介して電極層と接続されていることを特徴とする。
上記構成によれば、電極層と半田層とが密着層を介在させてサブマウント基板上に形成され、かつ、電極層と半田層の重複部とが接続されることで、電極層と半導体層とが電気的に接続されたサブマウントを提供することができる。
サブマウント基板は、好ましくは、窒化アルミニウム、炭化珪素、シリコンの何れかの材料からなる。半田層を構成する材料は、好ましくは、鉛を含まない半田からなる。また電極層は、好ましくは、金、白金、銀(Ag)、銅(Cu)、鉄(Fe)、アルミニウム(Al)、チタン、タングステン(W)の何れか一つ又はこれらの金属を二種類以上含む材料からなる。
上記構成において、好ましくは、半田層を形成する工程において、半田層には、密着層の外周部を介して電極層の上面に接続される重複部を設ける。
サブマウント基板上に窓部を有する電極層を形成する工程に先立って、好ましくは、サブマウント基板と電極層の間に密着層を形成する。
さらに、本発明の半田層の組成が変化しなので、半田接合の密着強度を向上することが
できる。
図1は、本発明によるサブマウント10の構造を模式的に示す断面図である。図1に示すように、本発明のサブマウント10は、サブマウント基板1と、サブマウント基板1上に形成される電極層2と、サブマウント基板1上に電極層2に隣接して形成される半田層3とを備え、電極層2と半田層3の外周部とが接続して構成される。即ち、半田層3が、密着層4を介して電極層の窓部2Aに埋め込まれ、かつ、半田層3の外周部と電極層2とが接続し、電気的に接続されている。この場合、電極層の窓部の幅をL0 とする。
ここで、電極層の窓部2Aは、電極層2に半田層3を形成するために開口した領域であり、エッチングなどの工程により電極層2を形成しない領域である。電極層2とサブマウント基板1との間には、密着層5を挿入してもよい。
なお、サブマウント10及び10Aにおいて、電極層2及び半田層3の電気的接続とは、上記のように電極2と半田層の重複部3Aや密着層の重複部4Aとの接続において、電極層2と半田層3との間に生じる電気抵抗が非常に小さいことを意味し、後述する半田層3に搭載される半導体装置などが、電極2と同電位になるような接続と定義する。
図3は、図1のサブマウント10,10Aに半導体装置8を搭載した構造を模式的に示す断面図である。図3に示すように、サブマウント10,10Aにおいて、半導体装置8は、その下部電極8Aを介して半田層3により半田接合される。この場合、半導体装置の下部電極8Aと半田層3とが直接接触しており、半田層3の下部に、相互拡散する金などの金属が介在していないので、半田層3はその組成で決まる融点温度となり、半田層3をPbフリー半田で形成しても、その融点は高くならない。したがって、本発明のサブマウント10,10Aでは、Pbフリー半田層3の組成で決まる融点近傍の低い温度で、半導体装置8との半田接合を実施することができる。このため、従来のように半田層3の下部には、相互拡散する金などの金属が介在していないので、半田接合温度の上昇に伴う半導体装置8の不良を著しく低減することができる。
これにより、本発明のサブマウント10,10Aによれば、電極層2と半田層3との間に半田バリア層を設けなくても、半導体装置8と半田層3とを強固に接合することが可能になる。
サブマウント基板1を用意し、その両側をラッピング装置により研削する。さらに、ポリッシング装置などを用いて仕上げ研磨を実施する。そして、研磨済みのサブマウント基板1を洗浄する。
露光後、テトラメチルアミン系の現像液により電極層2となる部分のレジストを溶解し、サブマウント基板1を露出させる。その結果、半田層3が形成される領域、即ち、窓部2Aとなる部分にはレジストが溶解しないで残ったままである。続いて、サブマウント基板1の表面全体に密着層5を形成する。密着層5は、真空蒸着装置やスパッタリング装置を用いた蒸着法により形成することができる。
引き続き、半田層3となる金属を電極層2の厚さよりも厚く蒸着し、アセトンなどを用いてレジスト全体を溶解させることにより、密着層4及び半田層3となる領域以外の蒸着した半田層をリフトオフにより除去する。このようにして、半田層3で電極の窓部2Aを埋め込んだ半田層3を形成することができる。さらに、マスクパターンなどの調整により、重複部3Aを有する半田層3も容易に形成することができる。このとき、半田層の重複部3Aの幅は、前述したように、電極層2と半田層3との電気的な接続を保つのに必要最小限な幅とすることが好ましい。
次に、サブマウント基板1の表面に露出している密着層をエッチングにより除去してサブマウント基板1の表面を露出させる。
最後に、得られたサブマウント基板1を、ダイシング装置などを用いて所定のサブマウント10の寸法に分割する。
図4は、実施例1で製造したサブマウント20を模式的に示す断面図である。
最初に、サブマウント20を製造する。
高熱伝導性(230W/mK)を有する55mm角、厚さ0.3mmの焼結窒化アルミニウム基板1の両面をラッピング装置によって研削し、ポリッシング装置を用いて仕上げ研磨を実施した。
露光後、テトラメチルアミン系の現像液により、電極層2となる部分のレジストを溶解し、基板1の表面を露出させた。なお、窓部2Aとなる部分にはレジストを形成したままである。
次に、真空蒸着装置により金を蒸着し、アセトンを用いてレジスト全体を溶解させることにより、電極層2以外のAuをリフトオフで除去し、窓部2Aを有する電極層2を0.2μm形成した。
続いて、電極層2と同様に、フォトリソグラフィー法及び真空蒸着装置を用い、窒化アルミニウム基板2表面に、リフトオフにより50nmの密着層4及び3.5μmの半田層3を形成した。半田層3の成分は、AuとSnの元素比が70:30となるようにした。半田層3のサイズは、幅L=500μmの正方形とし、半田層の重複部3Aの幅L1 は、1μm程度とした。この場合のL1 /Lは、0.2%である。
最後に、得られた窒化アルミニウム基板を、ダイシング装置を用いて、サブマウント10の寸法として、1mm角に切断し、実施例のサブマウント20を製造した。
(比較例1)
図5は、比較例1のサブマウント30を模式的に示す断面図でである。
密着層5上に金で電極層32を形成し、その電極層32上の一部に密着層33及び実施例と同じ組成(Au:Sn(元素比)=70:30)の半田層34を形成した以外は、実施例と同様の製造方法により、比較例1のサブマウント30を製造した。
図6は、比較例2のサブマウント40を模式的に示す断面図でである。密着層5上に金で電極層32を形成し、その電極層32上の一部に密着層41及びPtからなる半田バリア層42を形成し、さらに半田バリア層42上に実施例と同じ組成(Au:Sn(元素比)=70:30)の半田層34を形成した以外は、実施例と同様の製造方法により、比較例2のサブマウント40を製造した。
表1から明らかなように、実施例1では、半田層の重複部3Aの幅L1 と半田層幅Lとの比(L1 /L)が0.2%であり、チップせん断強度が45MPaであった。実施例2では、L1 /Lが4.4%であり、チップせん断強度が41MPaであった。実施例3では、L1 /Lが10%であり、チップせん断強度が32MPaであった。
一方、比較例1及び比較例2のチップせん断強度は、それぞれ、26MPa,4MPaとなり、明らかに、半田層の下部にPtからなる半田バリア層を設けた比較例2でチップせん断強度が40MPa以上となった。
2,32:電極層
2A:窓部
2B:上面
3, 7,34:半田層
3A:半田層の重複部
4,33,41:密着層(半田層下部)
4A:密着層の重複部
5:密着層(電極層下部)
6:密着層(基板裏面側)
8:半導体装置
8A:下部電極
8B:上部電極
9A, 9B:金線
10, 10A,20:サブマウント
30:比較例1のサブマウント
40:比較例2のサブマウント
42:比較例2のバリア層
Claims (12)
- サブマウント基板と、該サブマウント基板上に形成された電極層と、
該電極層の一部に開口して形成された半田層埋め込み用の窓部と、
上記電極層の窓部に形成されていて該電極層と接続される外周部を有する密着層と、
上記密着層を介して上記窓部に埋め込まれると共に、該密着層と接続される外周部を有する半田層と、
を備え、
上記密着層は、Ti,Ni,Cr,Moの何れか一つを主成分とする材料、又は、Ti,Ni,Cr,Moの何れか一つの合金を主成分とする材料からなり、
上記半田層は、上記密着層のみを介して上記電極層と接続され、
上記半田層の外周部が、上記密着層の外周部を介して上記電極層の上面に接続されることを特徴とする、サブマウント。 - 前記半田層が、前記密着層の外周部に接続される重複部を有し、該重複部が前記電極層の上面に電気的に接続されることを特徴とする、請求項1に記載のサブマウント。
- 前記半田層の重複部の幅L1と前記半田層の最表面の幅Lとの比が、10%以下であることを特徴とする、請求項2に記載のサブマウント。
- 前記半田層の重複部の幅L1と前記半田層の最表面の幅Lとの比が、4.4%以下であることを特徴とする、請求項2に記載のサブマウント。
- 前記サブマウント基板と前記窓部が形成されていない電極層との間に、さらに別の密着層を備えることを特徴とする、請求項1に記載のサブマウント。
- サブマウント基板と、該サブマウント基板上に形成された第1の密着層と、該第1の密着層上に形成された電極層と、該第1の密着層及び電極層の一部に開口して形成された半田層埋め込み用の窓部と、上記窓部に形成された第2の密着層と、該第2の密着層上に形成された半田層と、を備え、
上記密着層は、Ti,Ni,Cr,Moの何れか一つを主成分とする材料、又は、Ti,Ni,Cr,Moの何れか一つの合金を主成分とする材料からなり、
上記半田層が、上記窓部に形成された第2の密着層のみを介して上記電極層と接続されていることを特徴とする、サブマウント。 - 前記サブマウント基板は、窒化アルミニウム、炭化珪素、シリコンの何れかの材料からなることを特徴とする、請求項1又は6に記載のサブマウント。
- 前記半田層を構成する材料が、鉛を含まない半田からなることを特徴とする、請求項1又は6に記載のサブマウント。
- 前記電極層が、金、白金、銀(Ag)、銅(Cu)、鉄(Fe)、アルミニウム(Al)、チタン、タングステン(W)の何れか一つ、又は、これらの金属を二種類以上含む材料からなることを特徴とする、請求項1又は6に記載のサブマウント。
- サブマウント基板上に窓部を有する電極層を形成する工程と、
上記窓部に、Ti,Ni,Cr,Moの何れか一つを主成分とする材料、又は、Ti,Ni,Cr,Moの何れか一つの合金を主成分とする材料からなる密着層を形成する工程と、
上記密着層に半田層を形成する工程と、を含み、
上記密着層を形成する工程において、該密着層を上記電極層の窓部に形成すると共に、該電極層の上面と接続する密着層の外周部を形成し、
上記半田層を形成する工程において、上記半田層を、上記密着層のみを介して上記電極層と接続すると共に、上記半田層を上記密着層の外周部を介して上記電極層の上面に電気的に接続することを特徴とする、サブマウントの製造方法。 - 前記半田層を形成する工程において、前記半田層には、前記密着層の外周部を介して前記電極層の上面に接続される重複部を設けることを特徴とする、請求項10に記載のサブマウントの製造方法。
- 前記サブマウント基板上に窓部を有する電極層を形成する工程に先立って、前記サブマウント基板と前記電極層の間に密着層を形成することを特徴とする、請求項10に記載のサブマウントの製造方法。
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JP2005278958A JP4822155B2 (ja) | 2005-09-26 | 2005-09-26 | サブマウント及びその製造方法 |
TW095134416A TWI411069B (zh) | 2005-09-26 | 2006-09-18 | 銲錫層、使用該銲錫層之散熱基板及其製造方法 |
US12/067,355 US8310047B2 (en) | 2005-09-26 | 2006-09-19 | Solder layer, heat sink using such a solder layer and method for manufacturing such a heat sink |
PCT/JP2006/318531 WO2007034791A1 (ja) | 2005-09-26 | 2006-09-19 | 半田層及びこれを用いた放熱基板並びにその製造方法 |
EP06810273.0A EP1939929B1 (en) | 2005-09-26 | 2006-09-19 | Heat sink using a solder layer and method for manufacturing such heat sink |
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US9352532B2 (en) | 2013-04-30 | 2016-05-31 | Hewlett-Packard Development Company, L.P. | Film stack including adhesive layer |
JP6305127B2 (ja) * | 2014-03-12 | 2018-04-04 | 三菱電機株式会社 | 半導体レーザ光源 |
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