JP3204336B2 - 半導体素子用ボンディング線 - Google Patents

半導体素子用ボンディング線

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Publication number
JP3204336B2
JP3204336B2 JP26222092A JP26222092A JP3204336B2 JP 3204336 B2 JP3204336 B2 JP 3204336B2 JP 26222092 A JP26222092 A JP 26222092A JP 26222092 A JP26222092 A JP 26222092A JP 3204336 B2 JP3204336 B2 JP 3204336B2
Authority
JP
Japan
Prior art keywords
bonding
wire
added
point
semiconductor device
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 - Lifetime
Application number
JP26222092A
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English (en)
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JPH06112256A (ja
Inventor
一光 板橋
毅 鯨岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tanaka Denshi Kogyo KK
Original Assignee
Tanaka Denshi Kogyo KK
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Priority to JP26222092A priority Critical patent/JP3204336B2/ja
Publication of JPH06112256A publication Critical patent/JPH06112256A/ja
Application granted granted Critical
Publication of JP3204336B2 publication Critical patent/JP3204336B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01L24/42—Wire connectors; Manufacturing methods related thereto
    • H01L24/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L24/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
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    • H01L2224/01—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
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • 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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    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/44—Structure, shape, material or disposition of the wire connectors prior to the connecting process
    • H01L2224/45—Structure, shape, material or disposition of the wire connectors prior to the connecting process of an individual wire connector
    • H01L2224/45001—Core members of the connector
    • H01L2224/4501—Shape
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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
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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Wire Bonding (AREA)

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、半導体素子のチップ電
極と基板上の外部リードとを接続するために用いられる
半導体素子用ボンディングＡｕ線、特にワイヤボンディ
ング法及びバンプ接続法に好適なものに関する。
【０００２】
【従来の技術】従来から、例えばキャピラリーの先端に
垂下せしめたＡｕ線の先端を電気トーチにより溶融させ
てボールを形成し、このボールをチップ上のＡｌ又はＡ
ｌ合金からなる電極に圧着・切断してバンプ電極を形成
するバンプ接続法や、前記ボールをチップ電極に圧着，
接合せしめた後、ループ状に外部リードまで導いて該外
部リードに圧着・切断することにより、チップ電極と外
部リードを接続させるワイヤボンディング法が知られて
いる。
【０００３】また、この種ボンディングに用いるに有用
なＡｕ線として、特公昭６２−２２４４８号に開示され
るように、Ｐｄ，Ｐｔ，Ｒｈ，Ｉｒ，Ｏｓ，Ｒｕ（即
ち、Ｐｔ族元素）の中から１種以上を添加すると同時
に、Ｃａ，Ｂｅ，Ｇｅ，Ｎｉ，Ｆｅ，Ｃｏ，Ａｇの中か
ら１種以上を添加してなるものがある。
【０００４】
【発明が解決しようとする課題】しかし乍ら上記従来の
ボンディング線では、前記各元素の添加によってＡｕ線
における強度の向上は図れるものの、チップ上のＡｌ電
極とボールとの接合面（即ち、Ａ点）におけるＡｕとＡ
ｌの相互拡散が阻害され、その結果、ボンディング後の
高温放置試験におけるＡ点剥がれの発生率が高くなると
いう不具合があった。
【０００５】本発明はこのような従来事情に鑑みてなさ
れたものであり、その目的とするところは、Ｐｔ族元素
の添加によりＡｕ線の強度向上を図ると同時に、高温放
置試験におけるＡ点剥がれの発生率を低下させることに
ある。
【０００６】以上の目的を達成するために、本発明の半
導体素子用ボンディング線は、Ｐｄ，Ｐｔ，Ｒｈ，Ｉ
ｒ，Ｏｓ，Ｒｕの中から少なくとも１種を０．０００３
〜０．１wt％含有し、Ｓｃ，Ｙ，希土類元素の中から１
種以上を０．０００１〜０．０５wt％含有し、残部がＡ
ｕと不可避不純物である組成としたことを特徴とする。
【０００７】
【作用】上記の構成によれば、Ｐｄ，Ｐｔ，Ｒｈ，Ｉ
ｒ，Ｏｓ，Ｒｕの添加量を０．０００３〜０．１wt％の
範囲内とし、且つＳｃ，Ｙ，希土類元素の中から少なく
とも１種を同時添加することで、Ａｕ線の破断強度が向
上すると同時に、ボールとチップ電極の下地金属層との
接合面におけるＡｕとＡｌの相互拡散が適度になされ、
該接合面、即ち、Ａ点における接合強度が改善される。
【０００８】しかし乍ら、Ｐｄ，Ｐｔ，Ｒｈ，Ｉｒ，Ｏ
ｓ，Ｒｕの添加量が０．０００３wt％未満では満足な破
断強度が得られないと共に、前記接合面におけるＡｕと
Ａｌの相互拡散が過剰になり、接合強度の低下が生じ
る。また、Ｐｄ，Ｐｔ，Ｒｈ，Ｉｒ，Ｏｓ，Ｒｕの添加
量が０．１wt％を越えると、前記接合面におけるＡｕと
Ａｌの相互拡散が阻害されて接合強度が低下し、Ａ点剥
がれの発生率が高くなる。
【０００９】さらに、Ｓｃ，Ｙ，希土類元素の添加量が
０．０００１wt％未満だと前述の効果を得られず、ま
た、これら添加元素の総添加量が０．０５wt％を越える
と、ボール形成時におけるボール形状が安定せず、ボー
ルとチップ電極との接合強度が低下してＡ点剥がれの発
生率が高くなる。
【００１０】従って、Ｐｄ，Ｐｔ，Ｒｈ，Ｉｒ，Ｏｓ，
Ｒｕの添加量を０．０００３〜０．１wt％の範囲に、Ｓ
ｃ，Ｙ，希土類元素の添加量を０．０００１〜０．０５
wt％の範囲に、各々設定した。
【００１１】
【実施例】以下、具体的な実施例と比較例について説明
する。高純度Ａｕ（９９．９９％以上）に、Ｐｄ，Ｐ
ｔ，Ｒｈ，Ｉｒ，Ｏｓ，Ｒｕ，Ｓｃ，Ｙ，Ｌａ，Ｃｅ、
Ｃａ，Ｂｅ，Ｇｅ，Ｎｉ，Ｆｅ，Ｃｏ，Ａｇを表１中に
示す含有率に基づき添加して溶解鋳造し、次に溝ロール
加工を施し、その途中で焼なまし処理を施した後に線引
加工で線径２５μｍの母線に成形し、更に十分な応力除
去を行うことにより各試料とした。
【００１２】表１中の試料Ｎｏ．１〜９は高純度Ａｕ
に、Ｐｄ，Ｐｔ，Ｒｈ，Ｉｒ，Ｏｓ，Ｒｕ（以下、添加
元素Ｉという）の中から少なくとも１種を添加すると共
に、Ｓｃ，Ｙ，希土類元素（以下、添加元素IIという）
の中から少なくとも１種を添加した本発明実施品であ
る。
【００１３】また、表２中の試料Ｎｏ．１０〜１２は高
純度Ａｕに、上記添加元素Ｉの中から少なくとも１種を
添加し、添加元素IIを添加しない比較品、試料ＮＯ．１
３〜１５は添加元素Ｉの中から少なくとも１種を添加す
ると共に、Ｃａ，Ｂｅ，Ｇｅ，Ｎｉ，Ｆｅ，Ｃｏ，Ａｇ
の中から少なくとも１種を添加せしめた比較品である。
【００１４】尚、表１では希土類元素の代表としてＬ
ａ，Ｃｅを選んだが、これ以外の希土類元素はＬａ，Ｃ
ｅと同質性のため省略した。
【００１５】上記のようにして作製した各試料を熱処理
により所定の伸び率に合わせた後、破断強度及びＡ点剥
がれ発生率を測定した。
【００１６】破断強度は、各試料を標点間距離１００ｍ
ｍにて引張速度１０ｍｍ／ｍｉｎで引張り試験を行った
時の破断荷重を測定した。
【００１７】Ａ点剥がれ発生率は、各試料をＡｌ薄膜
（０．８μｍ厚）のチップ電極上に所定条件にてボンデ
ィングした後、Ａｌが拡散し易い高温条件下で放置し
（２００℃×３００時間）、その後にＣ点（ループ部）
を引張るプルテストを行って、ボンディングワイヤがチ
ップとの接合面から剥がれた割合を計算した。これらの
結果も表中に示す。
【００１８】
【表１】
【００１９】
【表２】
【００２０】而して、試料Ｎｏ．１〜９の測定結果か
ら、高純度Ａｕに添加元素Ｉ（Ｐｄ，Ｐｔ，Ｒｈ，Ｉ
ｒ，Ｏｓ，Ｒｕ）を０．０００３〜０．１wt％の範囲内
で添加すると共に、添加元素II（Ｓｃ，Ｙ，希土類元
素）の中から少なくとも１種を同時添加すれば、所望の
破断強度が得られると同時に、ボールとチップ電極の下
地金属層との接合面（Ａ点）において剥がれが発生せ
ず、該接合面における接合強度が改善されることが確認
できた。
【００２１】また、試料Ｎｏ．１０〜１２の測定結果か
ら、上記添加元素Ｉのみを添加した場合は、破断強度に
ついては添加元素の種類，添加量の違いによってばらつ
きがあるものの、Ａ点剥がれの発生率が高いことが確認
できた。
【００２２】さらに、試料ＮＯ．１３〜１５の測定結果
から、上記添加元素Ｉに加えてＣａ，Ｂｅ，Ｇｅ，Ｎ
ｉ，Ｆｅ，Ｃｏ，Ａｇを添加した場合は、ある程度の破
断強度は得られるものの、Ａ点剥がれの発生率が高いこ
とが確認できた。
【００２３】
【発明の効果】本発明に係る半導体素子用ボンディング
線は以上説明したように構成したので、Ｐｄ，Ｐｔ，Ｒ
ｈ，Ｉｒ，Ｏｓ，Ｒｕの添加による破断強度の向上効果
はそのまま維持しつつ、その添加量を所定の範囲内に限
定し且つＳｃ，Ｙ，希土類元素を所定量添加すること
で、ボンディング後の高温放置試験におけるＡ点剥がれ
の発生率を著しく低下できる。
【００２４】従って、ボンディング後において所定の強
度を得られると共に、ボールとチップ電極の接合強度を
著しく改善して、ワイヤボンディング法及びバンプ接続
法に用いるに極めて有用な半導体素子用ボンディング線
を提供できた。
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01L 21/60 301

Claims (1)

    (57)【特許請求の範囲】
  1. 【請求項１】 Ｐｄ，Ｐｔ，Ｒｈ，Ｉｒ，Ｏｓ，Ｒｕの
    中から少なくとも１種を０．０００３〜０．１wt％含有
    し、Ｓｃ，Ｙ，希土類元素の中から１種以上を０．００
    ０１〜０．０５wt％含有し、残部がＡｕと不可避不純物
    である半導体素子用ボンディング線。
JP26222092A 1992-09-30 1992-09-30 半導体素子用ボンディング線 Expired - Lifetime JP3204336B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26222092A JP3204336B2 (ja) 1992-09-30 1992-09-30 半導体素子用ボンディング線

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26222092A JP3204336B2 (ja) 1992-09-30 1992-09-30 半導体素子用ボンディング線

Publications (2)

Publication Number Publication Date
JPH06112256A JPH06112256A (ja) 1994-04-22
JP3204336B2 true JP3204336B2 (ja) 2001-09-04

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Country Status (1)

Country Link
JP (1) JP3204336B2 (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5945065A (en) * 1996-07-31 1999-08-31 Tanaka Denshi Kogyo Method for wedge bonding using a gold alloy wire
EP0890987B1 (de) * 1997-07-07 2003-03-05 W.C. Heraeus GmbH & Co. KG Feinstdraht aus einer Goldlegierung, Verfahren zu seiner Herstellung und seine Verwendung
AT407830B (de) * 1999-09-10 2001-06-25 Degussa Huels Cee Gmbh Hochgoldhaltige, gelbe dentallegierung
JP2004257950A (ja) * 2003-02-27 2004-09-16 Denso Corp 半導体圧力センサ
JP4513440B2 (ja) * 2004-07-15 2010-07-28 住友ベークライト株式会社 半導体装置
CN105063407B (zh) * 2015-05-30 2018-01-26 汕头市骏码凯撒有限公司 一种led封装用银合金键合丝及其制造方法

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