JP3765751B2 - 半導体素子の電極とボンディングワイヤとの接続構造 - Google Patents

半導体素子の電極とボンディングワイヤとの接続構造 Download PDF

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JP3765751B2
JP3765751B2 JP2001370979A JP2001370979A JP3765751B2 JP 3765751 B2 JP3765751 B2 JP 3765751B2 JP 2001370979 A JP2001370979 A JP 2001370979A JP 2001370979 A JP2001370979 A JP 2001370979A JP 3765751 B2 JP3765751 B2 JP 3765751B2
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gas
bonding wire
semiconductor element
bonding
connection structure
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JP2003174057A (ja
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英雄 中嶋
真憲 宮本
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Tatsuta Electric Wire and Cable Co Ltd
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Description

【０００１】
【発明の属する技術分野】
この発明は半導体のチップ電極と半導体素子用ボンディングワイヤとの接続構造に関する。
【０００２】
【従来の技術】
ＩＣ、ＬＳＩなどの半導体素子のチップ電極と外部リードとを接続するためにボンディングワイヤが用いられている。このボンディングワイヤには良好な導電性、チップや外部リードとの接合性、使用雰囲気中での耐環境性が要求され、それがためボンディングワイヤはアルミニウム、金、銅等の純金属もしくはその合金が用いられ、とりわけ金とその合金が主として用いられてきた。
【０００３】
これまで、コストダウンの目的から金とその合金に代えて銅とその合金を採用すべく各種銅ボンディングワイヤの開発・実用化が検討されてきたが、本格的な実用化に至っていない。
【０００４】
その理由としては、トーチによりボンディングワイヤの尖端を加熱・溶解して形成したイニシャルボールが硬く、ボールボンディングの際、電極チップやリード端子が損傷したりループの形状が安定しない等の恐れがあったからである。
【０００５】
一方、中嶋英雄は特願平８−２３９５８０号（特開平１０−８８２５４号）および特願平１１−１９５２６０号（特開平２０００−１０４１３０号）で「ポーラス金属の製造方法」を提案した。
【０００６】
この提案は極めて斬新な提案で、該ポーラス金属は、触媒材料、防震材料、衝撃緩衝材料等々十数種の用途があるとしており、この他にも新たな用途開発が追求されている。
【０００７】
【発明が解決しようとする課題】
上記のような状況のもとで、上記ポーラス金属の母材を圧延工程、伸線工程、軟化工程などを経てボンディングワイヤに適する細線にするならばポーラス部は圧延工程、伸線工程等で潰され、見た目では判別できない状態になるが、ガス部分は金属内部に残存するため加熱・溶解によりイニシャルボール形成時にボールのみがポーラス化され、該ポーラスの存在によって半導体の電極チップに大きい負荷を掛けないでボールボンドが行えるのではないかと考えられる。
【０００８】
本発明は、上記知見をもとにポーラス金属を母材として採用し、圧延・伸線工程などを経てボンディングワイヤを製作し種々検討を重ねた結果、半導体の電極チップを損傷させずにボールボンドができることをつきとめた。
【０００９】
従ってこの発明は、イニシャルボールがポーラス化する半導体素子用ボンディングワイヤを用いることにより半導体チップを損傷させることなく、半導体の電極チップとボンディングワイヤとの接続構造を提供することを課題とする。
【００１０】
【課題を解決するための手段】
上記課題を解決するためにこの発明は、加圧ガス雰囲気下で金属を溶解して、該ガスを該金属中に溶解し、ガス溶解金属の凝固時におけるガスの溶解度と固溶度の差を利用し、該溶解金属を加圧ガス雰囲気下で凝固させて、上記ガスを該金属内に析出させて得られるポーラス金属を素材とする半導体素子用ボンディングワイヤを用いて半導体の電極チップとボンディングワイヤとを接続したものである。
【００１１】
また、上記加圧ガス雰囲気が水素ガスまたは窒素ガスの単独ガス、若しくは前記単独ガスとアルゴンガスまたはヘリウムガスとの混合ガスとし、上記ガスの圧力を０．０５〜６ＭＰa として得られたポーラス金属を素材とする。
【００１２】
上記半導体素子用ボンディングワイヤは、ポーラス金属の母材を、圧延および／または伸線工程を経て得られ、線材の内部にはガス成分が残留するようにしたものである。
【００１３】
上記の如く構成するこの発明によれば、ポーラス金属を素材とする半導体素子用ボンディングワイヤを採用することにより、ボールボンドの際にボールが潰れ易くなって半導体の電極チップを損傷せずにボールボンドが可能となる。
【００１４】
従って、コストの高い金ボンディングワイヤを使用することなく、安価な銅ボンディングワイヤを採用できるようになる。
【００１５】
【発明の実施の形態】
次にこの発明の実施形態を、図面を参照しながら説明する。図１は中嶋英雄が特願平１１−１９５２６０号で提案したポーラス金属の製造方法で使用する装置で、１は加熱室、２は凝固室、３ａは銅、３ｂはガス、４はるつぼ、５は鋳型、６は冷却部、７は誘導加熱コイル、８はストッパロッド、９、１２はガス注入管、１０、１３はガス排出管、１１はファンネル、１４は冷却水注入管、１５は冷却水流出管である。
【００１６】
【実施例】
この装置のルツボ４に５Ｎの銅を投入、１２５０℃で溶解し、水素０．２ＭＰa の圧力、アルゴン０．６ＭＰa の圧力で供給し、上記混合ガス雰囲気中で誘導加熱（十分に攪拌される）した後、ファンネル１１を経て鋳型（内径＝１００mmφ×深さ＝１５０mm）に注入（鋳型は十分余熱されている）し、上記と同様の混合ガス雰囲気中で、数百度／分の速さで冷却、一方向凝固させてロータス型ポーラス銅（Porosity＝１９％）の母材（外径＝１００mmφ×長さ＝１３０mm）を得る。
【００１７】
上記母材を溝形ロールで圧延を繰り返して８mmφのワイヤロッドとし、このワイヤロッドを５mmφまで伸線し、表面の不整部分を皮むきし、引き続き伸線を繰り返して５０μm φのボンディングワイヤを製作した。
【００１８】
なお、比較例として４Ｎの銅母材と５Ｎの銅母材から上記と同様にしてボンディングワイヤを製作した。
【００１９】
上記実施例のボンディングワイヤと比較例のボンディングワイヤをボンディングマシンに装填し、（１）イニシャルボールの形状、（２）ボールの硬さ、（３）電極チップの損傷の有無、（４）ボンディング後のループの形状について検討した結果を表１に示す。
【００２０】
【表１】
Figure 0003765751
【００２１】
＜注記＞
＊１は、９９．９９９％の銅、一方向結晶母材からのボンディングワイヤ
＊２は、９９．９９％の銅、一方向結晶母材からのボンディングワイヤ
＊３は、トーチでボンディングワイヤの尖端を溶融したときのイニシャルボールの形状、丸くできているときは○とした。
＊４は、イニシャルボール径Ｄ（Ｄ＝（ｄ1 ＋ｄ2 ）／２）とイニシャルボールを電極チップに押しつけたときのボールの潰れ厚さ（ｔ）の差の逆数×１００で示す（図２参照）。
＊５は、ボンディングマシンでボールボンドしたときの電極チップの損傷具合を電子顕微鏡にて判定。損傷なしを○、有りを×とした。
＊６は、高さ（μm ）と括弧内はバラツキ（σn-1 ）
【００２２】
上記実施例は、ポロシティー１９％のロータス型ポーラス銅の母材からボンディングワイヤを製作したものであるが、この他のポロシティーのものを採用してもよく、また、ポーラスの形状も放射状、ランダム状あるいは長さ方向に傾斜したポーラス銅母材からでも製作できる。これらの母材から適宜の圧延・伸線工程、軟化工程を経て所望のボンディングワイヤを製作することもできる。
【００２３】
【発明の効果】
以上説明した如くこの発明によれば、ボールボンドにおいて小さい力でボンディングが可能となり電極チップの損傷が発生せず、ポーラス銅でありながらボンディング後のループ形状も安定したものとなった。
【００２４】
また、これにより安定した銅ボンディングワイヤによるワイヤボンディングが可能になりコストダウンに大きく貢献することができる。
【図面の簡単な説明】
【図１】ポーラス金属の溶解・鋳造装置の縦断面図
【図２】（ａ）ボールボンディングの圧着状態説明図
（ｂ）イニシャルボールの正面図
【符号の説明】
１ 加熱室
２ 凝固室
３ａ 金属
３ｂ ガス
４ るつぼ
５ 鋳型
６ 冷却部
７ 誘導加熱コイル
８ ストッパロッド
９，１２ ガス注入管
１０，１３ ガス排出管
１１ ファンネル
１４ 冷却水流入管
１５ 冷却水流出管

Claims (6)

  1. 加圧ガス雰囲気下で金属を溶解して、該ガスを該金属中に溶解し、ガス溶解金属の凝固時におけるガスの溶解度と固溶度の差を利用し、該溶解金属を加圧ガス雰囲気下で凝固させて、上記ガスを該金属内に析出させて得られるポーラス金属を素材とする半導体素子用ボンディングワイヤを用いた半導体素子の電極とボンディングワイヤとの接続構造。
  2. 上記溶解金属を加圧ガス雰囲気下で一方向凝固させて得られるポーラス金属を素材とする半導体素子用ボンディングワイヤを用いた請求項１に記載の半導体素子の電極とボンディングワイヤとの接続構造。
  3. 上記加圧ガス雰囲気が水素ガスまたは窒素ガスの単独ガス、若しくは前記単独ガスとアルゴンガスまたはヘリウムガスとの混合ガスである半導体素子用ボンディングワイヤを用いた請求項１または２に記載の半導体素子の電極とボンディングワイヤとの接続構造。
  4. 上記ガスの圧力が０．０５〜６ＭＰａのもとで得られたポーラス金属を素材とする半導体素子用ボンディングワイヤを用いた請求項１乃至３のいずれかに記載の半導体素子の電極とボンディングワイヤとの接続構造。
  5. 上記ポーラス金属の母材を、圧延および／または伸線工程を経て得られる半導体素子用ボンディングワイヤを用いた請求項１乃至４のいずれかに記載の半導体素子の電極とボンディングワイヤとの接続構造。
  6. 上記圧延および／または伸線工程を経て得られた線材の内部にガス成分が残留するようにした半導体素子用ボンディングワイヤを用いた請求項１乃至５のいずれかに記載の半導体素子の電極とボンディングワイヤとの接続構造。
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