JP3074626B2 - 半導体素子用Pt合金極細線 - Google Patents

半導体素子用Pt合金極細線

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Publication number
JP3074626B2
JP3074626B2 JP04262212A JP26221292A JP3074626B2 JP 3074626 B2 JP3074626 B2 JP 3074626B2 JP 04262212 A JP04262212 A JP 04262212A JP 26221292 A JP26221292 A JP 26221292A JP 3074626 B2 JP3074626 B2 JP 3074626B2
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Japan
Prior art keywords
wire
bonding
alloy
temperature strength
addition
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JPH06112252A (ja
Inventor
一光 板橋
毅 鯨岡
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Tanaka Denshi Kogyo KK
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Tanaka Denshi Kogyo KK
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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Pt合金極細線、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
垂下せしめた合金ワイヤ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Al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。また、この種ボンディングに用いるに有用な
合金ワイヤとして、特公昭62−43540号に開示さ
れるような、高純度PtからなるPtワイヤがある。
【0003】
【発明が解決しようとする課題】しかし乍ら、上記従来
のPtワイヤでは高温強度が弱く、所定のボンディング
強度が得られない欠点があると共に、Ptの純度が高す
ぎることから、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PtとAlの相互拡散が過剰に
なり、接合強度の低下が生じる結果、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。
【0004】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、所定の高温
強度が得られると共に、ボンディング後の高温放置試験
でA点剥がれが発生する虞れのない、信頼性の高い半導
体素子用Pt合金極細線を提供することである。
【0005】
【課題を解決するための手段】以上の目的を達成するた
めに、本発明の半導体素子用Pt合金極細線は、Au,
Pdの内の1種又は2種を総添加量で0.01〜10wt
%含有し、残部Ptからなることを特徴とする。
【0006】また、後述の理由から、上記の配合にR
u,Rhの内から1種又は2種を0.01〜1wt%含有
せしめること、さらには、前記の配合にBe,Ge,C
a,Si,Fe,Sc,Y,希土類元素の中から1種又
は2種以上を0.0001〜0.005wt%含有せしめ
ることが有用である。
【0007】
【作用】上記の構成によれば、Au,PdはPtに全率
固溶し、高温強度の高いPt合金ワイヤを形成する。同
時に、その添加総量を0.01〜10wt%の範囲内とし
たことから、ボールとチップ電極の下地金属層との接合
面におけるPtとAlの相互拡散を適度に抑止し、該接
合面、即ち、A点における接合強度が改善される。
【0008】また、Ru,Rhを添加することで、前記
Pt合金における結晶の粗粒化(粒子の粗大化)を防止
し、ワイヤの高温強度をさらに向上させる。
【0009】さらに、Be,Ge,Ca,Si,Fe,
Sc,Y,希土類元素の添加により、前記結晶の粗粒化
防止をより促進し、さらに高レベルな高温強度を得る。
【0010】しかし乍ら、Au,Pd、Ru,Rh、B
e,Ge,Ca,Si,Fe,Sc,Y,希土類元素の
各添加量が上記添加範囲の下限未満では、上述の効果を
得ることができない。
【0011】また、Au,Pdの添加量が10wt%を越
えると、ワイヤ先端に形成するボールが硬くなり過ぎ、
ボンディング時においてチップ割れが生じるので好まし
くない。Ru,Rhの添加量が1wt%を越えると、合金
形成時に偏析が生じ、伸線加工できないので好ましくな
い。Be,Ge,Ca,Si,Fe,Sc,Y,希土類
元素の添加量が0.005wt%を越えると、ワイヤ先端
に形成するボールの形状が不安定になり、ボンディング
時におけるボールとチップとの接合強度が低下する。
【0012】従って、Au,Pdの添加量を0.01〜
10wt%の範囲に、Ru,Rhの添加量を0.01〜1
wt%の範囲に、Be,Ge,Ca,Si,Fe,Sc,
Y,希土類元素の添加量を0.0001〜0.005wt
%の範囲に、各々設定した。
【0013】
【実施例】以下、具体的な実施例について説明する。
【0014】高純度Ptに、Au,Pd,Ru,Rh,
Be,Ge,Ca、Si,Fe,Sc,Y,Laの各添
加元素を表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。
【0015】表1中の試料No.1〜8は高純度Ptに
Au,Pdの1種又は2種を添加した本発明実施品、試
料No.9〜14は前記Au,Pdの配合に加えてR
u,Rhの1種又は2種を添加した本発明実施品、試料
No.15〜26は前記Au,Pd,Ru,Rhの配合
に加えて、Be,Ge,Ca,Si,Fe,Sc,Y,
希土類元素(La)の中から1種又は2種以上を添加し
た本発明実施品である。
【0016】また、試料No.27は高純度Pt(9
9.96wt%)に何も添加しない比較品である。
【0017】尚、表1では希土類元素の代表としてLa
のデータを示したが、これ以外の希土類元素はLaと同
質性のため省略した。
【0018】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、高温強度及びA点剥
がれ発生率を測定した。
【0019】高温強度は、各試料を250℃×20秒保
持後、標点間距離100mmにて引張速度10mm/m
inで引張り試験を行った時の破断荷重を測定した。
【0020】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1中に示す。
【0021】
【表1】
【0022】試料No.1〜8の測定結果から、高純度
PtにAu,Pdの1種又は2種を、総添加量0.01
〜10wt%の範囲内で添加すれば、所定の高温強度が得
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。
【0023】また、試料No.9〜14の測定結果か
ら、0.01〜10wt%のAu,Pdの添加に加えて、
Ru,Rhの1種又は2種を所定量添加すれば、上記高
温強度をさらに向上できることが確認できた。
【0024】さらに、試料No.15〜26の測定結果
から、0.01〜10wt%のAu,Pdの添加、0.0
1〜1wt%のRu,Rhの添加に加えて、Be,Ge,
Ca,Si,Fe,Sc,Y,希土類元素の中から1種
又は2種以上を所定量添加すれば、上記高温強度をより
高レベルなものにし得ることが確認できた。
【0025】また、試料No.27の測定結果から、高
純度PtにAu,Pd,Ru,Be,Ge,Ca,S
i,Fe,Sc,Y,希土類元素を添加しない場合は、
所定の高温強度が得られないと共に、A点剥がれの発生
率が高いことが確認できた。
【0026】
【発明の効果】本発明に係る半導体素子用Pt合金極細
線は以上説明したように、高純度PtにAu,Pdを添
加することで、ワイヤの高温強度向上を図ると同時に、
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
生率を著しく低下し得た。
【0027】従って、ボンディング後において所定の高
温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Pt合金極
細線を提供できた。
【0028】また、Ru,Rhの添加によって上記高温
強度をより向上し得、さらには、Be,Ge,Ca,S
i,Fe,Sc,Y,希土類元素を添加することで、よ
り高レベルな高温強度を得ることができた。
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平4−79245(JP,A) 特開 昭56−169340(JP,A) 特開 昭53−34101(JP,A) 特開 昭64−39335(JP,A) (58)調査した分野(Int.Cl.7,DB名) H01L 21/60 301

Claims (3)

    (57)【特許請求の範囲】
  1. 【請求項1】Au,Pdの内の1種又は2種を総添加量
    0.01〜10wt%含有し、残部Ptからなる半導体素
    子用Pt合金極細線。
  2. 【請求項2】 Au,Pdの内の1種又は2種を総添加
    量0.01〜10wt%含有すると共に、Ru,Rhの内
    から1種又は2種を0.01〜1wt%含有し、残部Pt
    からなる半導体素子用Pt合金極細線。
  3. 【請求項3】 Au,Pdの内の1種又は2種を0.0
    1〜10wt%、Ru,Rhの内から1種又は2種を0.
    01〜1wt%夫々含有すると共に、Be,Ge,Ca,
    Si,Fe,Sc,Y,希土類元素の中から1種又は2
    種以上を0.0001〜0.005wt%含有し、残部P
    tからなる半導体素子用Pt合金極細線。
JP04262212A 1992-09-30 1992-09-30 半導体素子用Pt合金極細線 Expired - Fee Related JP3074626B2 (ja)

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JP3074626B2 true JP3074626B2 (ja) 2000-08-07

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US5945065A (en) * 1996-07-31 1999-08-31 Tanaka Denshi Kogyo Method for wedge bonding using a gold alloy wire
SG165206A1 (en) * 2009-03-26 2010-10-28 Autium Pte Ltd Platinum alloys and method for forming the same
JP6604869B2 (ja) * 2016-02-19 2019-11-13 石福金属興業株式会社 白金パラジウムロジウム合金
CN113241303A (zh) * 2021-05-19 2021-08-10 合肥矽格玛应用材料有限公司 封装键合铂金丝及其制备方法
EP4198157A1 (fr) * 2021-12-14 2023-06-21 Nivarox-FAR S.A. Alliage de platine

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