JP5567657B2 - 導電性バンプまたはワイヤループを形成する方法 - Google Patents
導電性バンプまたはワイヤループを形成する方法 Download PDFInfo
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- JP5567657B2 JP5567657B2 JP2012503531A JP2012503531A JP5567657B2 JP 5567657 B2 JP5567657 B2 JP 5567657B2 JP 2012503531 A JP2012503531 A JP 2012503531A JP 2012503531 A JP2012503531 A JP 2012503531A JP 5567657 B2 JP5567657 B2 JP 5567657B2
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- 238000000034 method Methods 0.000 title claims description 110
- 238000009499 grossing Methods 0.000 claims description 38
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- 238000010586 diagram Methods 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000006664 bond formation reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- MYWUZJCMWCOHBA-VIFPVBQESA-N methamphetamine Chemical compound CN[C@@H](C)CC1=CC=CC=C1 MYWUZJCMWCOHBA-VIFPVBQESA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
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Description
本出願は2009年4月1日付けで出願された米国仮出願第61/165,679号の利益を主張するものであり、この参照によりその内容が本明細書に組み込まれるのものである。
従って、改善された導電性バンプおよびこの導電性バンプを形成する改善された方法を提供することが望まれている。
この出願の発明に関連する先行技術文献情報としては、以下のものがある(国際出願日以降国際段階で引用された文献及び他国に国内移行した際に引用された文献を含む)。
【先行技術文献】
【特許文献】
【特許文献2】 米国特許第7188759号明細書
【特許文献3】 米国特許第7229906号明細書
【特許文献4】 米国特許出願公開第2004/0164128号明細書
【特許文献5】 米国特許出願公開第2007/0199974号明細書
【特許文献6】 特開平5−047770号公報
【特許文献7】 韓国公開特許第10−1998−0053197
Claims (49)
- 導電性バンプを形成する方法であって、
(1)ボンディングボール(bonded ball)を形成するボンディングツールを使用して、ボンディング位置にフリーエアボール(free air ball)をボンディングする工程と、
(2)ワイヤクランプを開いた状態で、前記ボンディングボールに接続するワイヤを繰り出すと共に、前記ボンディングツールを望ましい高さまで上昇させる工程であって、当該工程は、バンピング工程におけるテールの高さ(tail height)である望ましい高さまで前記ボンディングツールを上昇させる工程を含むものである、前記上昇させる工程と、
(3)前記ワイヤクランプを閉じる工程と、
(4)前記ワイヤクランプが閉じた状態で、前記ボンディングツールを平滑化に適した高さまで下降させる工程と、
(5)前記ワイヤクランプが閉じた状態で、前記ボンディングツールを使用して前記ボンディングボールの上面を平滑化させる工程と、
(6)前記ワイヤクランプが閉じた状態で、前記ボンディングツールを上昇させ、前記ボンディングツールと係合するワイヤから前記ボンディングボールを分離させる工程と
を有する方法。 - 請求項1記載の方法において、前記工程(1)は、超音波エネルギー、超音波熱圧着エネルギー、および熱圧着エネルギーのうち少なくとも1つを使用して、前記ボンディング位置に前記フリーエアボールをボンディングする工程を含むものである方法。
- 請求項1記載の方法において、前記工程(1)は、(1)超音波エネルギー、超音波熱圧着エネルギー、および熱圧着エネルギーのうち少なくとも1つを使用し、且つ(2)ワイヤボンディング機のXYテーブルのスクラブ運動を使用して前記ボンディング位置に前記フリーエアボールをボンディングする工程を含むものである方法。
- 請求項1記載の方法において、前記工程(2)は、前記ボンディングボールの上面から5〜20ミル上方の高さである望ましい高さまで前記ボンディングツールを上昇させる工程を含むものである方法。
- 請求項1記載の方法において、前記工程(4)は、前記ボンディングツールの先端部が前記ボンディングボールの上面と接触する平滑化に適した高さまで前記ボンディングツールを下降させる工程を含むものである方法。
- 請求項1記載の方法において、前記工程(4)は、前記工程(1)における前記ボンディングツールの高さより0.1〜2ミル高い平滑化に適した高さまで前記ボンディングツールを下降させる工程を含むものである方法。
- 請求項1記載の方法において、前記工程(4)は、前記ワイヤクランプが閉じた状態で、前記平滑化に適した高さまで前記ボンディングツールを下降させることによって、前記ワイヤクランプと前記ボンディングツールとの間にワイヤの弛み長さを形成する工程を含むものである方法。
- 請求項7記載の方法において、前記工程(6)は、前記ボンディングツールを上昇させる工程の間超音波エネルギーを適用することにより、前記ワイヤの弛み長さの少なくとも一部が前記ボンディングツール内を通過してワイヤテールを形成する工程を含むものである方法。
- 請求項1記載の方法において、前記工程(6)は、前記ボンディングツールを上昇させる工程の間超音波エネルギーを適用する工程を含むものである方法。
- 請求項1記載の方法において、前記工程(4)および(5)は、少なくとも部分的に同時に行われるものである方法。
- 請求項1記載の方法において、前記工程(4)および(5)は、前記ボンディングツールの下方および角度を有する運動により行われるものである方法。
- 請求項1記載の方法において、前記工程(5)の間、前記ボンディングボールの上面は前記ボンディングツールの水平運動によって平滑化されるものである方法。
- 請求項1記載の方法において、前記工程(5)の間、前記ボンディングボールの上面は前記ボンディングツールの下方および水平要素を有する運動によって平滑化されるものである方法。
- 請求項1記載の方法において、前記工程(5)の間、前記ボンディングボールの上面は前記ボンディングツールの上方および水平要素を有する運動によって平滑化されるものである方法。
- 請求項1記載の方法において、前記工程(5)の少なくとも一部分の間、超音波エネルギーが前記ボンディングツールに適用されるものである方法。
- ワイヤループを形成する方法であって、
(1)ボンディング位置に導電性バンプを形成する工程であって、
(a)ボンディングボールを形成するボンディングツールを使用して、ボンディング位置にフリーエアボール(free air ball)をボンディングする工程と、
(b)ワイヤクランプを開いた状態で、前記ボンディングボールに接続するワイヤを繰り出すと共に、前記ボンディングツールを望ましい高さまで上昇させる工程であって、当該工程は、バンピング工程におけるテールの高さである望ましい高さまで前記ボンディングツールを上昇させる工程を含むものである、前記上昇させる工程と、
(c)前記ワイヤクランプを閉じる工程と、
(d)前記ワイヤクランプが閉じた状態で、前記ボンディングツールを平滑化に適した高さまで下降させる工程と、
(e)前記ワイヤクランプが閉じた状態で、前記ボンディングツールを使用して前記ボンディングボールの上面を平滑化させる工程と、
(f)前記ワイヤクランプが閉じた状態で、前記ボンディングツールを上昇させ、前記ボンディングツールと係合するワイヤから前記ボンディングボールを分離させることにより、前記ボンディング位置に導電性バンプを形成する工程と
を有する前記導電性バンプを形成する工程と、
(2)前記ボンディングツールを使用して別のボンディング位置にワイヤの一部分をボンディングする工程と、
(3)前記ワイヤのボンディングされた部分から前記導電性バンプに向って所定の長さのワイヤを伸長させる工程と、
(4)前記所定の長さのワイヤの端部を前記導電性バンプにボンディングする工程と
を有する方法。 - 請求項16記載の方法において、前記工程(3)は、前記所定の長さのワイヤが前記ボンディングされた部分の延長部分となるように当該ボンディングされた部分から前記所定の長さのワイヤを伸長させる工程を含むものである方法。
- 請求項16記載の方法において、前記工程(a)は、超音波エネルギー、超音波熱圧着エネルギー、および熱圧着エネルギーのうち少なくとも1つを使用して、前記ボンディング位置にフリーエアボールをボンディングする工程を含むものである方法。
- 請求項16記載の方法において、工程(a)は、(1)超音波エネルギー、超音波熱圧着エネルギー、および熱圧着エネルギーのうち少なくとも1つを使用し、且つ(2)ワイヤボンディング機のXYテーブルのスクラブ運動を使用して前記ボンディング位置に前記フリーエアボールをボンディングする工程を含むものである方法。
- 請求項16記載の方法において、工程(b)は、前記ボンディングボールの上面から5〜20ミル上方の高さである望ましい高さまで前記ボンディングツールを上昇させる工程を含むものである方法。
- 請求項16記載の方法において、工程(d)は、前記ボンディングツールの先端部が前記ボンディングボールの上面と接触する前記平滑化に適した高さまで前記ボンディングツールを下降させる工程を含むものである方法。
- 請求項16記載の方法において、工程(d)は、前記工程(a)における前記ボンディングツールの高さより0.1〜2ミル高い平滑化に適した高さまで前記ボンディングツールを下降させる工程を含むものである方法。
- 請求項16記載の方法において、前記工程(d)は、前記ワイヤクランプが閉じた状態で、前記平滑化に適した高さまで前記ボンディングツールを下降させることによって、前記ワイヤクランプと前記ボンディングツールとの間にワイヤの弛み長さを形成する工程を含むものである方法。
- 請求項23記載の方法において、前記工程(f)は、前記ボンディングツールを上昇させる工程の間超音波エネルギーを適用することにより、前記ワイヤの弛み長さの少なくとも一部分が前記ボンディングツール内を通過してワイヤテールを形成する工程を含むものである方法。
- 請求項16記載の方法において、前記工程(f)は、前記ボンディングツールを上昇させる工程の間超音波エネルギーを適用する工程を含むものである方法。
- 請求項16記載の方法において、前記工程(d)および(e)は、少なくとも部分的に同時に行われるものである方法。
- 請求項16記載の方法において、前記工程(d)および(e)は、前記ボンディングツールの下方および角度を有する運動により行われるものである方法。
- 請求項16記載の方法において、前記工程(e)の間、前記ボンディングボールの上面は前記ボンディングツールの水平運動によって平滑化されるものである方法。
- 請求項16記載の方法において、前記工程(e)の間、前記ボンディングボールの上面は前記ボンディングツールの下方および水平要素を有する運動によって平滑化されるものである方法。
- 請求項16記載の方法において、前記工程(e)の間、前記ボンディングボールの上面は前記ボンディングツールの上方および水平要素を有する運動によって平滑化されるものである方法。
- 請求項16記載の方法において、前記工程(e)の少なくとも一部分の間、超音波エネルギーが前記ボンディングツールに適用されるものである方法。
- 請求項16記載の方法において、前記工程(4)の間、前記ボンディングツールのz−位置が監視され、前記ボンディングする工程(4)の間に適用される超音波エネルギーは、前記ボンディングツールが所定のz−位置に達すると停止されるものである方法。
- 請求項32記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は前記工程(e)の間の前記ボンディングツールの平滑化に適した高さである方法。
- 請求項32記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、前記工程(4)の間に超音波エネルギーが作動される初期z−位置である方法。
- 請求項32記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、(1)前記ボンディングツールおよび前記所定の長さのワイヤの端部と(2)前記導電性バンプとの間の衝撃変形後の所定の時間における前記ボンディングツールの位置である方法。
- 請求項16記載の方法において、前記工程(4)の間、前記ボンディングツールのz−位置は監視され、前記ボンディングする工程(4)の間に適用される超音波エネルギーは、前記ボンディングツールが所定の時間遅延後に所定のz−位置に達すると停止されるものである方法。
- 請求項36記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は前記工程(e)の間の前記ボンディングツールの平滑化に適した高さである方法。
- 請求項36記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、前記工程(4)の間に超音波エネルギーが作動される初期z−位置である方法。
- 請求項36記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、(1)前記ボンディングツールおよび前記所定の長さのワイヤの端部と(2)前記導電性バンプとの間の衝撃変形後の所定の時間における前記ボンディングツールの位置である方法。
- 請求項16記載の方法において、前記工程(4)の間、前記ボンディングツールのz−位置は監視され、前記ボンディングする工程(4)の間に適用される超音波エネルギーレベルは、前記ボンディングツールが所定のz−位置に達すると減少されるものである方法。
- 請求項40記載の方法において、前記超音波エネルギーレベルは、前記ボンディングツールが所定のz−位置に達すると少なくとも50%減少されるものである方法。
- 請求項40記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は前記工程(e)の間の前記ボンディングツールの平滑化に適した高さである方法。
- 請求項40記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、前記工程(4)の間に超音波エネルギーが作動される初期z−位置である方法。
- 請求項40記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、(1)前記ボンディングツールおよび前記所定の長さのワイヤの端部と(2)前記導電性バンプとの間の衝撃変形後の所定の時間における前記ボンディングツールの位置である方法。
- 請求項16記載の方法において、工程(4)の間、前記ボンディングツールのz−位置は監視され、前記ボンディングする工程(4)の間に適用される超音波エネルギーレベルは、前記ボンディングツールが所定の時間遅延後に所定のz−位置に達すると減少されるものである方法。
- 請求項45記載の方法において、前記超音波エネルギーレベルは、前記ボンディングツールが所定のz−位置に達すると少なくとも50%減少されるものである方法。
- 請求項45記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は前記工程(e)の間の前記ボンディングツールの平滑化に適した高さである方法。
- 請求項45記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、前記工程(4)の間に超音波エネルギーが作動される初期z−位置である方法。
- 請求項45記載の方法において、前記所定のz−位置は基準z−位置に関連して選択されるものであり、この基準z−位置は、(1)前記ボンディングツールおよび前記所定の長さのワイヤの端部と(2)前記導電性バンプとの間の衝撃変形後の所定の時間における前記ボンディングツールの位置である方法。
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