JP5343069B2 - ボンディングワイヤの接合構造 - Google Patents
ボンディングワイヤの接合構造 Download PDFInfo
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- JP5343069B2 JP5343069B2 JP2010504316A JP2010504316A JP5343069B2 JP 5343069 B2 JP5343069 B2 JP 5343069B2 JP 2010504316 A JP2010504316 A JP 2010504316A JP 2010504316 A JP2010504316 A JP 2010504316A JP 5343069 B2 JP5343069 B2 JP 5343069B2
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- bonding
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Description
さらに、銅系ボンディングワイヤによるバンプ/ウェッジ接合の量産性を低下させる原因として、連続ボンディング作業においてスタッドバンプがボンディングステージ上で加熱されている間に、バンプ表面において銅の酸化が進行してしまうことが、ウェッジ接合の強度の低下を加速させていることが確認された。ここでのバンプ/ウェッジ接合における接合強度の評価では、プル試験が簡便且つ有効であり、好ましくはバンプの近くにフックを掛けて上方に引っ張るセカンドプル試験を行うことが望ましい。複雑な形状をしたスタッドバンプの表面に形成された銅酸化物を、ウェッジ接合のときの荷重、超音波振動により十分に破壊することは困難であり、銅酸化物がバンプ/ウェッジ接合の界面に連続的に残存することで接合強度を低下させている。ステージ上でワイヤボンディングされる領域に不活性ガスを吹付ける方法により、スタッドバンプの表面酸化をある程度まで減少させることは可能ではあるが、作業性の面から完全なシールド状態を得ることは難しい。従来の金ボンディングワイヤ用のボンダ装置の利用、銅系ボンディングワイヤ用にガスシールドの改善等、既に知られている技術の延長だけでは、バンプ/ウェッジ接合の界面に介在する銅酸化物を抑制することは困難である。こうしたワイヤ接合部の酸化がボンディング工程中に進行して生産性を低下させることは、銅系ボンディングワイヤの逆ボンディングに特有の現象であり、これまでの金ボンディングワイヤ、銅系ボンディングワイヤの正ボンディングでは殆ど問題とならない。
2:バンプ(スタッドバンプ)
3:電極
4:半導体素子
a:バンプ/ウェッジ接合の接合界面
b:電極/バンプ接合の接合界面
Claims (13)
- 半導体素子の電極上に形成したボールバンプの上にボンディングワイヤを接続するボンディングワイヤの接合構造であって、前記ボンディングワイヤ及び前記ボールバンプは銅を主成分とし、前記ボールバンプと前記ボンディングワイヤとの接合部の界面に銅以外の金属Rの濃度が前記ボールバンプにおける金属Rの平均濃度の10倍以上である濃化層Aを有し、且つ、前記ボールバンプと前記電極との接合部の界面に金属Rの濃度が、前記ボールバンプにおける金属Rの平均濃度の10倍以上である濃化層Bを有すると共に、前記濃化層Aにおいて、金属Rの濃度が10mol%以上である領域の厚さが0.01〜4μmの範囲であり、前記濃化層Bにおいて、金属Rの濃度が3mol%以上である領域の厚さが0.01〜5μmの範囲であり、前記金属Rがパラジウム、金、白金、銀から選ばれる1種以上の元素であり、前記ボンディングワイヤは、銅を主成分とする芯材と、金属Rを主成分とし前記芯材を被覆する外皮層とからなることを特徴とするボンディングワイヤの接合構造。
- 前記濃化層Aにおいて、金属Rの濃度が50mol%以上である領域の厚さが0.005〜0.8μmの範囲であることを特徴とする請求項1に記載のボンディングワイヤの接合構造。
- 前記濃化層Bの少なくとも一部が、前記電極の主成分と銅とを主成分とする拡散層又は金属間化合物の少なくともどちらかの内部に形成されていることを特徴とする請求項1又は2に記載のボンディングワイヤの接合構造。
- 前記濃化層Aにおける金属Rの濃度が50mol%以上である領域の厚さが、前記濃化層Bにおける金属Rの濃度が50mol%以上である領域の厚さの3倍以上であることを特徴とする請求項1〜3のいずれか1項に記載のボンディングワイヤの接合構造。
- 前記接合構造において、前記ボールバンプの表面の40%以上の領域及び、前記ボールバンプの上に接続された前記ボンディングワイヤの表面の30%以上の領域において、金属Rの濃度が前記ボールバンプにおける金属Rの平均濃度の5倍以上である濃化層Cが形成されたことを特徴とする請求項1〜4のいずれか1項に記載のボンディングワイヤの接合構造。
- 半導体素子の電極上に形成したボールバンプの上にボンディングワイヤを接続する接合構造であって、前記ボンディングワイヤ及び前記ボールバンプは銅を主成分とし、前記ボールバンプと前記ボンディングワイヤとの接合部の界面に銅以外の金属Rの濃度が前記ボールバンプにおける金属Rの平均濃度の10倍以上である濃化層Aを有し、且つ、前記ボールバンプの表面の40%以上の領域及び、前記ボールバンプの上に接続された前記ボンディングワイヤの表面の30%以上の領域において、金属Rの濃度が前記ボールバンプにおける金属Rの平均濃度の5倍以上である濃化層Cを有すると共に、前記濃化層Aにおいて、金属Rの濃度が10mol%以上である領域の厚さが0.01〜4μmの範囲であり、バンプ表面の前記濃化層Cは、金属Rの濃度が0.5mol%以上である領域の厚さが0.05〜20μmの範囲であり、前記金属Rがパラジウム、金、白金、銀から選ばれる1種以上の元素であり、前記ボンディングワイヤは、銅を主成分とする芯材と、金属Rを主成分とし前記芯材を被覆する外皮層とからなることを特徴とするボンディングワイヤの接合構造。
- 前記濃化層Aにおいて、金属Rの濃度が50mol%以上である領域の厚さが0.005〜0.8μmの範囲であることを特徴とする請求項6に記載のボンディングワイヤの接合構造。
- 金属Rがパラジウム、金、及び白金から選ばれる1種以上の元素であることを特徴とする請求項1〜7のいずれか1項に記載のボンディングワイヤの接合構造。
- 金属Rがパラジウムと銀、またはパラジウムと金の2種の金属であることを特徴とする請求項1〜7のいずれか1項に記載のボンディングワイヤの接合構造。
- 前記濃化層Aがパラジウムと銀との合金、またはパラジウムと金との合金のいずれかの合金領域と、パラジウムの最高濃度が80mol%以上である領域とを含むことを特徴とする請求項9に記載のボンディングワイヤの接合構造。
- 前記ボンディングワイヤと前記ボールバンプとの接合界面から上下に1μmの幅の領域において、酸素濃度が10mol%以上含有される領域の厚さが0〜0.05μm(0μmを含まない)の範囲であることを特徴とする請求項1〜10のいずれか1項に記載のボンディングワイヤの接合構造。
- 前記外皮層の主成分である金属Rがパラジウム、金、銀、及び白金から選ばれる1種以上の元素であることを特徴とする請求項1〜11のいずれか1項に記載のボンディングワイヤの接合構造。
- 前記外皮層の厚さが0.002〜0.8μmの範囲であることを特徴とする請求項1〜12のいずれか1項に記載のボンディングワイヤの接合構造。
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JP5616739B2 (ja) * | 2010-10-01 | 2014-10-29 | 新日鉄住金マテリアルズ株式会社 | 複層銅ボンディングワイヤの接合構造 |
JP2012160554A (ja) * | 2011-01-31 | 2012-08-23 | Toshiba Corp | ボンディングワイヤの接合構造及び接合方法 |
KR102078986B1 (ko) * | 2012-03-22 | 2020-02-19 | 스미또모 베이크라이트 가부시키가이샤 | 반도체 장치 및 그 제조 방법 |
US9093383B1 (en) | 2012-10-15 | 2015-07-28 | Freescale Semiconductor, Inc. | Encapsulant for a semiconductor device |
US8853867B2 (en) | 2012-10-15 | 2014-10-07 | Freescale Semiconductor, Inc. | Encapsulant for a semiconductor device |
JPWO2014083805A1 (ja) * | 2012-11-28 | 2017-01-05 | パナソニックIpマネジメント株式会社 | 発光装置および発光装置の製造方法 |
DE102020117641A1 (de) * | 2020-07-03 | 2022-01-05 | Hesse Gmbh | Drahtführungsmodul und Ultraschall-Drahtbonder hiermit |
US11848297B2 (en) * | 2021-06-30 | 2023-12-19 | Texas Instruments Incorporated | Semiconductor device packages with high angle wire bonding and non-gold bond wires |
CN117413238A (zh) | 2021-07-19 | 2024-01-16 | 萨思学会有限公司 | 使用工艺数据的质量预测 |
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