JP6176910B2 - 接続構造体の製造方法 - Google Patents
接続構造体の製造方法 Download PDFInfo
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- JP6176910B2 JP6176910B2 JP2012210225A JP2012210225A JP6176910B2 JP 6176910 B2 JP6176910 B2 JP 6176910B2 JP 2012210225 A JP2012210225 A JP 2012210225A JP 2012210225 A JP2012210225 A JP 2012210225A JP 6176910 B2 JP6176910 B2 JP 6176910B2
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- anisotropic conductive
- conductive adhesive
- solder particles
- particles
- connection structure
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Classifications
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- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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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
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
- H01L23/293—Organic, e.g. plastic
- H01L23/295—Organic, e.g. plastic containing a filler
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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
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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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
- H01L24/80—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
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- 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
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Description
1.異方性導電接着剤及びその製造方法
2.接続構造体及びその製造方法
3.実施例
本実施の形態における異方性導電接着剤は、はんだ粒子がエポキシ樹脂と酸無水物とを含有するバインダー(接着剤成分)中に分散されたものであり、その形状は、ペースト、フィルムなどであり、目的に応じて適宜選択することができる。
次に、前述した異方性導電接着剤を用いた接続構造体について説明する。本実施の形態における接続構造体は、第1の電子部品の端子と、第2の電子部品の端子とが、樹脂粒子の表面に導電性金属層が形成された導電性粒子を介して電気的に接続されてなる接続構造体において、第1の電子部品の端子と前記第2の電子部品の端子との間に、はんだ粒子が捕捉されている。
以下、本発明の実施例について詳細に説明するが、本発明はこれらの実施例に限定されるものではない。
実施例1〜3、比較例2、3として、白色無機粒子として、その表面がSi及びAlによりコートされた平均粒子径が0.5μm酸化チタン(品名:JR、テイカ(株)製)、及びはんだ粒子(M707、千住金属(株)製)をエポキシ樹脂硬化系接着剤に分散し、目的の異方性導電接着剤を作成した。
上記の各異方性導電接着剤をセラミックス製の白色板に乾燥厚で100μmとなるように塗布し、200℃で1分間加熱硬化させた。この硬化物について、分光光度計(U3300、日立製作所(株))を用いて、波長450nmの光に対する反射率(JIS K7150)を測定した。得られた結果を表1に示す。反射率は、実用上30%以上であることが望まれる。
実施例1、2、4、5及び比較例1〜3の異方性導電接着剤を用いてAuバンプを必要としないフリップチップ用LEDチップ(青色LED、Vf=3.2V(If=350mA))をAu電極基板に搭載した。異方性導電接着剤をAu電極基板に塗布した後、LEDチップをアライメントして搭載し、加熱ヘッドの温度を変えて(180℃、200℃、220℃、260℃)、60秒−1kg/chipの条件で加熱圧着を行った。なお、加熱ヘッドの温度に基づく実際の異方性導電接着剤を熱電対測定器(品名:データロガー、グラフテック社製)を用いて測定した。
過渡熱抵抗測定装置(CATS電子設計社製)を用いて、LED実装体の熱抵抗値(℃/W)を測定した。測定条件はIf=200mA(定電流制御)で行った。
積分球による全光束測定装置(LE−2100、大塚電子株式会社製)を用いて、LED実装体の全光束量(mlm)を測定した。測定条件はIf=200mA(定電流制御)で行った。
チップ/異方性導電接着剤/基板のダイシェア強度を測定した。ダイシェア強度は、実装したLEDチップを横方向に引っかき、チップが外れるときの強度を測定するものである。測定環境25℃において、測定速度20μm/secで測定した。測定装置は、ボンドテスターPTR−1100(レスカ社製)を用いた。
(導通特性)
初期Vf値として、If=20mA時のVf値を測定した。また、−40℃/30min<>100℃/30min、1000サイクルの熱衝撃試験に投入し、If=20mA時のVf値を測定した。熱衝撃試験の初期の評価は、導通の破断を確認した場合(OPEN)を「×」と評価し、それ以外を「○」と評価した。熱衝撃試験後の評価は、初期Vf値よりも5%以上上昇した場合を導通NGとして「×」評価し、それ以外を「○」と評価した。
逆電圧5V印加時の初期Ir値を測定し、Ir=1μA以上でリークNGとして「×」と評価し、それ以外を「○」と評価した。
Claims (11)
- 第1の電子部品及び第2の電子部品の夫々の端子を、はんだ粒子を介して電気的に接続されてなる接続構造体の製造方法において、
はんだ粒子が、エポキシ樹脂と酸無水物とを含有する熱硬化性接着剤組成物に分散された異方性導電接着剤を、前記第1の電子部品及び前記第2の電子部品の端子との間に配置する工程と、
前記第1の電子部品の端子と第2の電子部品の端子のいずれか一方を、所定の加熱温度で押圧して、前記はんだ粒子を前記第1及び第2の電子部品の端子間に捕捉させる工程を有し、
前記所定の加熱温度が、前記はんだ粒子の融点の15℃以下であり、
前記はんだ粒子の融点が、210〜250℃の範囲である接続構造体の製造方法。 - 前記所定の加熱温度が、前記熱硬化性接着剤組成物の反応開始温度以上である請求項1に記載の接続構造体の製造方法。
- 前記熱硬化性接着剤組成物に白色無機粒子が分散されてなる請求項1又は請求項2に記載の接続構造体の製造方法。
- 前記白色無機粒子の熱伝導率が、10W/(m・K)である請求項3に記載の接続構造体の製造方法。
- 前記第1の電子部品が、LED素子であり、前記第2の電子部品が、前記LED素子を搭載する基板である請求項1〜4のいずれか1項に記載の接続構造体の製造方法。
- 前記LED素子の端子が金であり、前記基板の端子が金である請求項5に記載の接続構造体の製造方法。
- 前記LED素子の端子が金錫合金であり、前記基板の端子が金である請求項6に記載の接続構造体の製造方法。
- 請求項1乃至7に記載のいずれか1項に記載の接続構造体の製造方法に使用される異方性導電接着剤であって、はんだ粒子が、エポキシ樹脂と酸無水物とを含む熱硬化性接着剤組成物に分散されてなる異方性導電接着剤。
- 白色無機粒子が分散されてなる請求項8に記載の異方性導電接着剤。
- 前記白色無機粒子の平均粒径が0.2〜10μmであり、前記白色無機粒子が当該異方性導電接着剤全量に対して1〜50体積%の範囲で配合され、
前記はんだ粒子の平均粒子径が1〜20μmであり、前記はんだ粒子が当該異方性導電接着剤全量に対して1〜50体積%の範囲で配合され、
前記酸無水物がエポキシ樹脂1.0当量に対して0.7〜1.3当量の範囲で配合されてなる請求項9に記載の異方性導電接着剤。 - 前記酸無水物がエポキシ樹脂1.0当量に対して1.0当量を超えて配合されてなる請求項10に記載の異方性導電接着剤。
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