JP2018037527A - 配線基板及びその製造方法 - Google Patents
配線基板及びその製造方法 Download PDFInfo
- Publication number
- JP2018037527A JP2018037527A JP2016169587A JP2016169587A JP2018037527A JP 2018037527 A JP2018037527 A JP 2018037527A JP 2016169587 A JP2016169587 A JP 2016169587A JP 2016169587 A JP2016169587 A JP 2016169587A JP 2018037527 A JP2018037527 A JP 2018037527A
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- JP
- Japan
- Prior art keywords
- layer
- plating
- wiring board
- conductive
- plating layer
- 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.)
- Pending
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000007747 plating Methods 0.000 claims abstract description 159
- 239000004020 conductor Substances 0.000 claims abstract description 107
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000001465 metallisation Methods 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 288
- 239000010949 copper Substances 0.000 claims description 108
- 239000010931 gold Substances 0.000 claims description 42
- 239000011148 porous material Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 34
- 239000002344 surface layer Substances 0.000 claims description 30
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 27
- 239000000758 substrate Substances 0.000 claims description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 24
- 229910052802 copper Inorganic materials 0.000 claims description 24
- 230000005291 magnetic effect Effects 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 19
- 229910052709 silver Inorganic materials 0.000 claims description 17
- 239000004332 silver Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 13
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 12
- 229910052737 gold Inorganic materials 0.000 claims description 12
- 229910052763 palladium Inorganic materials 0.000 claims description 9
- 239000011135 tin Substances 0.000 claims description 9
- 239000000696 magnetic material Substances 0.000 claims description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- 229910052718 tin Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 22
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 239000000919 ceramic Substances 0.000 description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 33
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 11
- 229910000679 solder Inorganic materials 0.000 description 11
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 11
- 229910052721 tungsten Inorganic materials 0.000 description 10
- 239000010937 tungsten Substances 0.000 description 10
- 239000000377 silicon dioxide Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007772 electroless plating Methods 0.000 description 6
- 238000009713 electroplating Methods 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 238000005530 etching Methods 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 4
- 238000005476 soldering Methods 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002889 diamagnetic material Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002907 paramagnetic material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0242—Structural details of individual signal conductors, e.g. related to the skin effect
-
- 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
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/017—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of aluminium or an aluminium alloy, another layer being formed of an alloy based on a non ferrous metal other than aluminium
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- B32B15/018—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of a noble metal or a noble metal alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C—CHEMISTRY; METALLURGY
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
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- C—CHEMISTRY; METALLURGY
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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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
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4846—Leads on or in insulating or insulated substrates, e.g. metallisation
- H01L21/4857—Multilayer substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
- H01L23/13—Mountings, e.g. non-detachable insulating substrates characterised by the shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49822—Multilayer substrates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49866—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers characterised by the materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/552—Protection against radiation, e.g. light or electromagnetic waves
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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
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
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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
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
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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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
- H05K3/1283—After-treatment of the printed patterns, e.g. sintering or curing methods
- H05K3/1291—Firing or sintering at relative high temperatures for patterns on inorganic boards, e.g. co-firing of circuits on green ceramic sheets
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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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
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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
- H01L2224/26—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
- 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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- H01—ELECTRIC ELEMENTS
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Abstract
Description
この配線基板の製造方法では、導体部の形成工程として、一部又は全体が導電材料からなり、導電性を有する非磁性体である導体ベース部の表面に、導電材料からなり非磁性体の導電層を形成する第1の工程と、導電層を加熱して軟化又は溶融させ、その後冷却して固化させる第2の工程と、固化させた導電層の表面に、メッキによって、導電材料からなり非磁性体の表面層を形成する第3の工程と、を有する。
なお、導電層の加熱処理を行う場合には、導電層を形成する導電材料の融点の80%以上の温度で加熱することができる。
本第2局面では、導電層及び表面層の材料(即ち非磁性体の材料)として好適な材料を例示している。
本第3局面では、表面層の表面(即ち露出した表面)に、メッキによって、金、銀、錫を用いて表面メッキ層を形成するので、表面層の酸化を抑制することができる。そのため、表面メッキ層に対して、各種の部品の実装やワイヤーボンディングを好適に行うことができる。
(4)本発明の第4局面では、第4の工程の前の工程であって、表面層の表面に、メッキによって、パラジウムからなるパラジウムメッキ層を形成する第5の工程を有する。
本第5局面では、例えば導電ベース部の材料の状態(例えば粉末材料の場合は粒径)や製造条件(例えばメタライズの場合は加熱条件)などを調節することにより、導体ベース部の表面(即ち露出した表面)に、微小な凹凸(従ってその凹部である開気孔部)を形成することができる。例えば粉末の粒径を大きくすることにより大きな開気孔部を形成することができる。
(6)本発明の第6局面では、導体ベース部が複数の種類の材料を含む場合に、第1の工程の前の工程として、導体ベース部から特定の種類の材料を除去する処理を行う第6の工程を有する。
(7)本発明の第7局面では、導体ベース部を、メタライズによって形成する。
この配線基板では、導体部は、一部又は全体が導電材料からなり、導電性を有する非磁性体である導体ベース部と、導体ベース部の表面に配置された非磁性体の中間層と、導電材料からなり中間層の表面に配置された非磁性体の導電層と、導電材料からなり導電層の表面に配置された非磁性体の表面層と、を備えている。そして、中間層は、導体ベース部の材料と導電層の材料とを含んでいる。
(9)本発明の第9局面では、導電層は、銅又は銀からなり、表面層は、銅又は銀からなる。
(10)本発明の第10局面では、表面層の表面に、金、銀、錫のうち少なくとも一種からなる表面メッキ層を備えている。
本第11局面では、表面層と表面メッキ層との間に、パラジウムメッキ層を備えているので、その分表面メッキ層を薄くすることができる。
本第12局面の構成により、導体ベース部上に導電層を形成する場合には、アンカー効果による密着性が向上する。
本第13局面では、導体ベース部の表面の開気孔部に、導電層の導電材料があるので、導体ベース部上に導電層を形成する場合には、アンカー効果による密着性が向上する。
本第14局面は、導体ベース部の好適な構成を例示したものである。
<以下に、本発明の各構成について説明する>
・非磁性体とは、磁化率が0より小さい反磁性体、及び磁化率が10×10−5より小さい常磁性体を示している。
・導体ベース部に用いられる導電材料としては、非磁性体の例えば、W、Mo、CuW、CuMo等が挙げられる。
・メタライズとは、セラミックや非金属材料の表面を、例えば焼成によって焼結させること等によって金属化したものであり、それによって形成された金属化した層がメタライズ層である。
[1.第1実施形態]
本第1実施形態では、例えばセラミック基板上に配線層である導体部を形成したセラミック配線基板及びその製造方法を例に挙げて説明する。
[1−1.セラミック配線基板の構成]
まず、本第1実施形態のセラミック配線基板の構成について説明する。
このうち、セラミック基板3は、非磁性体である例えばアルミナからなる焼結体(アルミナ焼結体)であり、導体部5は、後述するような導電性を有する非磁性体の複数の層から構成されている。
また、前記メタライズ層7の表面に沿って(即ち開気孔部9が形成されている表面に沿って)、中間層11が形成されている。この中間層11は、その厚み方向の両側(図2の上下)の層、即ち図2の下側のメタライズ層7と後述する図2の上側の下部Cuメッキ層(即ち導電層)13との成分が含まれた層である。つまり、中間層11は、例えば、タングステンやセラミック材料や銅(Cu)などからなる層である。
[1−2.セラミック配線基板の製造方法]
次に、本第1実施形態のセラミック配線基板1の製造方法について説明する。
次に、前記メタライズペーストを、セラミック基板3の表面に塗布する。その後、例えば1500℃で焼成することにより、メタライズ層7を形成する。
つまり、シリカ粒子(SR)を除去することにより、内径が最大3μm程度の大きな開気孔部9を形成できる。このメッキ前処理によって、メタライズ層7の表面からシリカ粒子(SR)が除去されて、新たな開気孔部9が形成されることもある。
なお、メタライズ層7のエッチング前の表面を、走査型電子顕微鏡(SEM)を用いて倍率3000倍にて撮影した。図5にそのSEM写真を示すように、メタライズ層7の表面には、多数の気孔(ボイド)があること、つまり、多数の開気孔部9が形成されていることが分かる。
具体的には、例えば周知の電解メッキや無電解メッキ(即ちCuメッキ)によって、メタライズ層7の表面に、例えば厚さ1.5μmの初期Cuメッキ層19を形成する。
なお、軟化又は溶融させた初期メッキ層19は、開気孔部9に入り込むが、初期メッキ層19の厚み(例えば1.5μm)よりも大きい径の開気孔部9では、十分に銅が充填されずに、開気孔部9に起因した凹部が下部Cuメッキ層13の表面に残ることがある。
具体的には、例えば周知の電解メッキや無電解メッキ(即ちCuメッキ)によって、下部Cuメッキ層13の表面に、例えば厚さ5μmの上部Cuメッキ層15を形成する。
具体的には、例えば周知の電解メッキや無電解メッキ(即ちAuメッキ)によって、上部Cuメッキ層15の表面に、例えば厚さ1μmのAuメッキ層17を形成する。
[1−3.評価]
ここでは、評価として、ハンダ性評価とワイヤーボンディング性評価について説明する。
本発明の範囲の実施例1、2として、前記実施形態と同様にして、セラミック基板3上に導体部5を形成した試料(サンプル)を作製した。なお、この試料は、メタライズ層7の上に厚み5μmの初期Cuメッキ層19を形成し、本発明の加熱処理を実施して形成した下部Cuメッキ層13の上に厚さ5μmの上部Cuメッキ層15を形成し、その上部Cuメッキ層15の上に厚さ1μmのAuメッキ層17を形成したものである。
本発明の範囲の実施例3、4として、前記実施例1,2と同様にして、セラミック基板3上に導体部5を形成した試料(サンプル)を作製した。
そして、各試料の導体部5に対して、φ30μmのAuワイヤーをボンディングした。その後、セラミック基板3を固定して、Auワイヤーに荷重を加えて引っ張る引張り試験(MIL-STD-883)を行い、破壊の状態を調べた(即ちワイヤーボンディング性を調べた)。
[1−4.効果]
次に、本第1実施形態の効果について説明する。
[1−5.特許請求の範囲との対応関係]
ここで、第1実施形態と特許請求の範囲との文言の対応関係について説明する。
[2.第2実施形態]
次に、第2実施形態について説明するが、第1実施形態と同様な内容の説明は省略する。
図7に示すように、本第2実施形態のセラミック配線基板21は、第1実施形態と同様に、セラミック基板3の表面に配線層である導体部23が形成されてものである。
[3.第3実施形態]
次に、第3実施形態について説明するが、第1実施形態と同様な内容の説明は省略する。
図8に示すように、本第3実施形態の非磁性体の配線基板31は、例えば銅とタングステンの合金(CuW)又は銅とモリブデンの合金(CuMo)からなるヒートシンクである非磁性体の金属板33に、枠状の例えばアルミナ等からなる非磁性体のセラミック部材35等が接合されたものである。
また、被覆層37の表面には、例えばIC等の電子部品39が、接着剤層41によるダイボンディングにより接合されている。
本第3実施形態では、第1実施形態と同様な効果を奏する。
[4.他の実施形態]
本発明は前記実施形態になんら限定されるものではなく、本発明を逸脱しない範囲において種々の態様で実施しうることはいうまでもない。
3…セラミック基板
5、53…導体部
7…メタライズ層
9…開気孔部
11…中間層
13…下部Cuメッキ層
15…上部Cuメッキ層
17…Auメッキ層
25…Pdメッキ層
33…金属板
37…被覆層
Claims (14)
- 導電性を有し非磁性体である導体部が形成された配線基板の製造方法において、
前記導体部の形成工程は、
一部又は全体が導電材料からなり、導電性を有する非磁性体である導体ベース部の表面に、導電材料からなり非磁性体の導電層を形成する第1の工程と、
前記導電層を加熱して軟化又は溶融させ、その後冷却して固化させる第2の工程と、
前記固化させた前記導電層の表面に、メッキによって、導電材料からなり非磁性体の表面層を形成する第3の工程と、
を有することを特徴とする配線基板の製造方法。 - 前記導電層を、銅又は銀を用いて形成し、前記表面層を、銅又は銀を用いて形成することを特徴とする請求項1に記載の配線基板の製造方法。
- 前記表面層の表面に、メッキによって、金、銀、錫のうち少なくとも一種からなる表面メッキ層を形成する第4の工程を有することを特徴とする請求項2に記載の配線基板の製造方法。
- 前記第4の工程の前の工程であって、前記表面層の表面に、メッキによって、パラジウムからなるパラジウムメッキ層を形成する第5の工程を有することを特徴とする請求項3に記載の配線基板の製造方法。
- 前記導体ベース部を粒子を含む材料によって形成する場合に、前記導体ベース部の表面に、凹部である開気孔部を形成することを特徴とする請求項1〜4のいずれか1項に記載の配線基板の製造方法。
- 前記導体ベース部が複数の種類の材料を含む場合に、前記第1の工程の前の工程として、前記導体ベース部から特定の種類の前記材料を除去する処理を行う第6の工程を有することを特徴とする請求項1〜5のいずれか1項に記載の配線基板の製造方法。
- 前記導体ベース部を、メタライズによって形成することを特徴とする請求項1〜6のいずれか1項に記載の配線基板の製造方法。
- 導電性を有し非磁性体である導体部を有する配線基板において、
前記導体部は、
一部又は全体が導電材料からなり、導電性を有する非磁性体である導体ベース部と、
前記導体ベース部の表面に配置された非磁性体の中間層と、
導電材料からなり前記中間層の表面に配置された非磁性体の導電層と、
導電材料からなり前記導電層の表面に配置された非磁性体の表面層と、
を備えており、
前記中間層は、前記導体ベース部の材料と前記導電層の材料とを含むことを特徴とする配線基板。 - 前記導電層は、銅又は銀からなり、前記表面層は、銅又は銀からなることを特徴とする請求項8に記載の配線基板。
- 前記表面層の表面に、金、銀、錫のうち少なくとも一種からなる表面メッキ層を備えたことを特徴とする請求項8又は9に記載の配線基板。
- 前記表面層と前記表面メッキ層との間に、パラジウムメッキ層を備えたことを特徴とする請求項10に記載の配線基板。
- 前記導体ベース部の表面に、凹部である開気孔部を有することを特徴とする請求項8〜11のいずれか1項に記載の配線基板。
- 前記導体ベース部の表面の前記開気孔部に、前記導電層の導電材料があることを特徴とする請求項12に記載の配線基板。
- 前記導体ベース部は、メタライズ層であることを特徴とする請求項8〜13のいずれか1項に記載の配線基板。
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Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20210622 |