JP2021065923A - 核材料、電子部品及びバンプ電極の形成方法 - Google Patents
核材料、電子部品及びバンプ電極の形成方法 Download PDFInfo
- Publication number
- JP2021065923A JP2021065923A JP2019194731A JP2019194731A JP2021065923A JP 2021065923 A JP2021065923 A JP 2021065923A JP 2019194731 A JP2019194731 A JP 2019194731A JP 2019194731 A JP2019194731 A JP 2019194731A JP 2021065923 A JP2021065923 A JP 2021065923A
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- Prior art keywords
- solder
- plating layer
- layer
- mass
- core
- Prior art date
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- Granted
Links
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Images
Classifications
-
- 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
- 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
-
- 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
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/17—Metallic particles coated with metal
-
- 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
-
- 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
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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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- 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
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- 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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- 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
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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
- 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
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- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/30—Electroplating: Baths therefor from solutions of tin
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
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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
-
- 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
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- 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
- H05K3/3478—Applying solder preforms; Transferring prefabricated solder patterns
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0338—Layered conductor, e.g. layered metal substrate, layered finish layer, layered thin film adhesion layer
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10234—Metallic balls
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10734—Ball grid array [BGA]; Bump grid array
-
- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/04—Soldering or other types of metallurgic bonding
- H05K2203/041—Solder preforms in the shape of solder balls
-
- 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
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
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Abstract
Description
核と、前記核の外方に設けられた(Sn−Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が91.4〜106.7%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなってもよい。
核と、前記核の外方に設けられた(Sn−58Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が91.4〜108.6%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなってもよい。
前記(Sn−40Bi)系はんだ合金の目標組成がSn−40Bi−0.5Cuとなってもよい。
核と、前記核の外方に設けられた(Sn−40Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が90〜107.5%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなってもよい。
核と、前記核の外方に設けられた(Sn−3Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が90〜106.7%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなってもよい。
前記核と前記はんだ層との間に、Ni及びCoから選択された1元素以上の下地めっき層が設けられてもよい。
核としてCuボール又はCuカラムが使用されてもよい。
前述した核材料がはんだバンプとして使用されてもよい。
前述した核材料を電極上に搭載する工程と、
搭載した前記核材料を加熱することによりバンプ電極を形成する工程と、
を備えてもよい。
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたときに、濃度比が90〜108.6%となってもよい。より限定するのであれば、濃度比は91.4〜106.7%となってもよい。
濃度比(%)=計測値(質量%)/目標とする含有量(質量%)
あるいは、
濃度比(%)=計測値の平均の値(質量%)/目標とする含有量(質量%)
として表することができる。
添加元素としては、Ag、Cu、Ni、Ge、Ga、In、Zn、Fe、Pb、Sb、Au、Pd、Co等のうち一種または二種以上使用することが考えられる。
前述したとおり、核(コア)としては金属か樹脂が考えられ、その形状も球体その他の形状(柱状のカラムやシート状等)が考えられる。本実施の形態では、球体であって、核として特にCuからなるボール(「Cuボール」ともいう。)を使用したCu核ボールの場合について説明する。本実施の形態におけるCu核ボールとは、核がCuを含有していれば足り、その他の構成については特に限定されない。
核としては、Cu以外にも、Ni、Ag、Bi、Pb、Al、Sn、Fe、Zn、In、Ge、Sb、Co、Mn、Au、Si、Pt、Cr、La、Mo、Nb、Pd、Ti、Zr、Mgの金属単体やこれらの二種以上の合金、金属酸化物、あるいは金属混合酸化物により構成してもよいし、樹脂材料によって構成してもよい。樹脂材料としては、例えばアミノ樹脂、アクリル樹脂、エチレン−酢酸ビニル樹脂、スチレン−ブタジエンブロック共重合体、ポリエステル樹脂、メラミン樹脂、フェノール樹脂、アルキド樹脂、ポリイミド樹脂、ウレタン樹脂、エポキシ樹脂、架橋樹脂等からなるものが挙げられる。中でもポリアセチレン、ポリピロール、ポリチオフェン、ポリアニリンなどの導電性プラスチック等を使用するのが好ましい。核を樹脂材料とした場合、樹脂の核と、樹脂の核の外方を被覆するCuめっき層と、Cuめっき層の表面を被覆するNi等の下地めっき層と、下地めっき層の表面を被覆するはんだめっき層によりCu核ボールを構成することができる。なお、Cu核ボールの積層構造は、上記例に限定されるものではない。
めっき液としては、有機酸、メタンスルホン酸Bi及び界面活性剤の混合液が使用される。めっき液の濃度ははんだめっき層形成中、一定となるように制御される。
図3及び図4より、はんだめっき層16中のBiの濃度は、はんだめっき層16の厚みが成長してもほぼ同じ状態を維持していることから、はんだめっき層16中のBiはほぼ均質に分布した状態で成長(析出)していることを確認できる。Bi濃度が所期の値内に収まるようにめっき液中のBi濃度が均質にされた状態でめっき処理が行われる。また、Cu核ボール10が銀色系からなる球形状であることも確認できた(図5参照)。
<黄色度>
核ボールの黄色度は、コニカミノルタ製CM−2600d型分光測色計を使用して測定した。L*a*b*表色系における黄色度が8.5以下のものを「良」とし、各表では「○」で表示し、L*a*b*表色系における黄色度が8.5超過のものを「不良」と判定し、各表では「×」と表示した。
<接合時の不良>
黄色度を測定した各サンプルと同じ製造バッチで作製した各実施例及び各比較例における組成からなる核ボール(サンプル)を10個準備し、それぞれを基板に通常のリフロー処理により接合した。接合時の不良については、10個全てのサンプルにおいて接合不良が測定されなかったものを「良」とし各表では「○」で表示した。他方、1つのサンプルでも接合時に位置ずれ又はボールミッシングが発生するか、1つのサンプルでも接合時に核がはじけ飛ばされたものを「不良」と判定し、表では「×」で表示した。
・核12の直径 :300μm
・Ni下地めっき層14の膜厚 :片側2μm
・はんだめっき層16の膜厚 :片側18μm又は38μm
・Snめっき層20を除くCu核ボール10の直径:340μm又は380μm
Ni下地めっき層14のめっき方法は、核がCuの表1、表2のサンプルについては、電気めっき工法(バレル電気めっき)を使用し、核が樹脂である表3、表4のサンプルについては、無電解めっき工法を使用し、核がアルミニウムである表5、表6のサンプルについては、核であるアルミニウムに対してダブルジンケート処理を施し、処理後のアルミニウムに対して、無電解めっき工法にてNiめっきを薄くめっきし、その後、電気めっき工法にて狙いの片側2μmの厚さに成長させる方法を使用した。
はんだめっき層16のめっき方法は電気めっき工法(バレル電気めっき)にて図6の条件となるように作製した。
はんだめっき層16の厚みが薄い片側18μmからなる場合に、Snめっき層20を除くCu核ボール10の直径は340μmとなっている。他方、はんだめっき層16の厚みが厚い片側38μmからなる場合に、Snめっき層20を除くCu核ボール10の直径は380μmとなっている。
・核12の直径 :300μm
・Ni下地めっき層14の膜厚 :片側2μm
・はんだめっき層16の膜厚 :片側18μm又は38μm
・Snめっき層20を除くCu核ボール10の直径:340μm又は380μm
Ni下地めっき層14のめっき方法は、核がCuの表1、表2のサンプルについては、電気めっき工法(バレル電気めっき)を使用し、核が樹脂である表3、表4のサンプルについては、無電解めっき工法を使用し、核がアルミニウムである表5、表6のサンプルについては核であるアルミニウムに対してダブルジンケート処理を施し、処理後のアルミニウムに対して、無電解めっき工法にてNiめっきを薄くめっきし、その後、電気めっき工法にて狙いの片側2μmの厚さに成長させる方法を使用した。
はんだめっき層16のめっき方法は電気めっき工法(バレル電気めっき)にて図7又は図8の条件となるように作製した。
はんだめっき層16の厚みが薄い片側18μmからなる場合に、Snめっき層20を除くCu核ボール10の直径は340μmとなっている。他方、はんだめっき層16の厚みが厚い片側38μmからなる場合に、Snめっき層20を除くCu核ボール10の直径は380μmとなっている。
その後、試料をメタンスルホン酸Sn、有機酸及び界面活性剤を含むめっき液に投入し、各実施例及び各比較例(Snめっき層20を形成しない比較例を除く)に記載のSnめっき層20の厚さになるまでバレル電気めっきを行った。
12 核
14 下地めっき層
16 はんだめっき層(はんだ層)
20 Snめっき層(Sn層)
16a 内層
16b 中間層
16c 外層
17a〜17c 切片(計測領域)
Claims (9)
- 核と、前記核の外方に設けられた(Sn−Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が91.4〜106.7%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなることを特徴とする核材料。 - 核と、前記核の外方に設けられた(Sn−58Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が91.4〜108.6%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなることを特徴とする核材料。 - 核と、前記核の外方に設けられた(Sn−40Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が90〜107.5%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなることを特徴とする核材料。 - 前記(Sn−40Bi)系はんだ合金の目標組成がSn−40Bi−0.5Cuであることを特徴とする請求項3に記載の核材料。
- 核と、前記核の外方に設けられた(Sn−3Bi)系はんだ合金のはんだ層と、前記はんだ層の外方に設けられたSn層とを備え、
上記はんだ層中に含まれるBiの濃度比を、
濃度比(%)=Biの計測値(質量%)/目標とするBi含有量(質量%)
あるいは、
濃度比(%)=Biの計測値の平均の値(質量%)/目標とするBi含有量(質量%)
としたとき、上記濃度比が90〜106.7%となり、
前記Sn層が前記はんだ層の厚さの0.215%以上36%以下の厚さとなることを特徴とする核材料。 - 前記核と前記はんだ層との間に、Ni及びCoから選択された1元素以上の下地めっき層が設けられることを特徴とする請求項1乃至5のいずれか1項に記載の核材料。
- 請求項1乃至6のいずれか1項に記載の核材料であって、核としてCuボール又はCuカラムが使用されていることを特徴とする核材料。
- 請求項1乃至7のいずれか1項に記載の核材料がはんだバンプとして使用されることを特徴とする電子部品。
- 請求項1乃至7のいずれかに記載の核材料を電極上に搭載する工程と、
搭載した前記核材料を加熱することによりバンプ電極を形成する工程と、
を備えることを特徴とするバンプ電極の形成方法。
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JP2019194731A JP6761199B1 (ja) | 2019-10-25 | 2019-10-25 | 核材料、電子部品及びバンプ電極の形成方法 |
CN202080030861.8A CN113767469B (zh) | 2019-10-25 | 2020-09-30 | 芯材料、电子部件和凸点电极的形成方法 |
TW109134234A TWI747537B (zh) | 2019-10-25 | 2020-09-30 | 芯材料、電子部件以及凸塊電極的形成方法 |
PCT/JP2020/037042 WO2021079702A1 (ja) | 2019-10-25 | 2020-09-30 | 核材料、電子部品及びバンプ電極の形成方法 |
EP20878745.7A EP3950982B1 (en) | 2019-10-25 | 2020-09-30 | Core material, electronic component and method for forming bump electrode |
US17/610,876 US11872656B2 (en) | 2019-10-25 | 2020-09-30 | Core material, electronic component and method for forming bump electrode |
KR1020217034108A KR102345867B1 (ko) | 2019-10-25 | 2020-09-30 | 핵 재료, 전자 부품 및 범프 전극의 형성 방법 |
PT208787457T PT3950982T (pt) | 2019-10-25 | 2020-09-30 | Material de núcleo, componente eletrónico e método para formação de elétrodo de impulso |
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JP2015147951A (ja) * | 2014-02-04 | 2015-08-20 | 千住金属工業株式会社 | 核ボール、はんだペースト、フォームはんだ、フラックスコート核ボールおよびはんだ継手 |
WO2016031067A1 (ja) * | 2014-08-29 | 2016-03-03 | 千住金属工業株式会社 | はんだ材料、はんだ継手及びはんだ材料の製造方法 |
JP2018089683A (ja) * | 2016-12-06 | 2018-06-14 | テトス カンパニー,リミテッド | はんだ粒子 |
JP2018089677A (ja) * | 2016-12-07 | 2018-06-14 | 千住金属工業株式会社 | 核材料および半導体パッケージおよびバンプ電極の形成方法 |
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US20220212294A1 (en) | 2022-07-07 |
WO2021079702A1 (ja) | 2021-04-29 |
US20240100635A1 (en) | 2024-03-28 |
KR102345867B1 (ko) | 2022-01-03 |
TW202116540A (zh) | 2021-05-01 |
CN113767469A (zh) | 2021-12-07 |
TWI747537B (zh) | 2021-11-21 |
EP3950982B1 (en) | 2023-12-27 |
KR20210139424A (ko) | 2021-11-22 |
EP3950982A4 (en) | 2023-01-18 |
CN113767469B (zh) | 2022-10-25 |
US11872656B2 (en) | 2024-01-16 |
PT3950982T (pt) | 2024-01-18 |
EP3950982A1 (en) | 2022-02-09 |
JP6761199B1 (ja) | 2020-09-23 |
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