JP2008071918A - 半導体素子および半導体素子の検査方法 - Google Patents
半導体素子および半導体素子の検査方法 Download PDFInfo
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Abstract
【解決手段】ダイオード素子100の単位セル10は,P型半導体領域1と,N型半導体領域2と,アノード電極11と,カソード電極21とを備えている。また,アノード電極11の表面は,ワイヤボンディングあるいははんだ付けに供するアノード電極用パッド15となる。また,アノード電極11には,絶縁膜3に被覆された破壊検出電極31が内蔵されている。絶縁破壊電極31は,アノード電極用パッド15のパッド面の下方に位置している。そして,微小欠陥の検査では,アノード電極11と破壊検出電極31との間に検査バイアスを印加する。
【選択図】 図1
Description
(1)半導体素子製造工程中のウェハテストにおけるプロービングや,パワーモジュール製造工程中のワイヤボンディングによって,素子表面にクラックが生じる。そして,そのクラックが半導体素子内部にまで達する。
(2)半導体素子に加わる圧力や歪みにより,半導体素子内部にクラックが生じる。
図1に本形態のダイオード素子100の単位セル10の断面図を示す。図2にダイオード素子100の上面図を示す。本形態のダイオード素子100は,図2に示すように,複数のセル10が並列に組み込まれた構成となっている。ダイオード素子100の単位セル10は,図1に示すように,上面側に位置するP型半導体領域1と,下面側に位置するN型半導体領域2とを有し,両領域が対峙することによってダイオードを構成している。また,P型半導体領域1上にはアノード電極11が形成され,N型半導体領域2上にはカソード電極21が形成されている。また,アノード電極11の露出面は,ワイヤボンディングあるいははんだ付けに供するパッド15(アノード電極用パッド15)となる。ダイオード素子100の単位セル幅は約40μmであり,アノード電極11表面からカソード電極21表面までの高さは約300μmである。
図4に本形態のダイオード素子100を組み込んだパワーモジュール110全体の上面図を示す。また,図5は,図4に示したパワーモジュール110の一部を抜粋し,パワーモジュール110の主要部分の概略構成を示した図である。パワーモジュール110は,アノード導体61およびカソード導体62を内蔵する絶縁基板60と,モジュールハウジング側のパッド70(モジュールボンディング用パッド70)とを備え,絶縁基板60上にダイオード素子100とIGBT素子80とが配置されている。
図6にリーク電流検査装置の測定回路120を示す。図6中の破線で囲まれた部分が本形態のダイオード素子100に相当する(図3参照)。測定回路120では,図6に示すように,破壊検出端子とアノード電極との間に直流バイアスを印加し,微小電流計によってリーク電流を測定する。
2 N型半導体領域
11 アノード電極(電極領域)
15 アノード電極用パッド(電極パッド)
21 カソード電極
3 絶縁膜
31 破壊検出電極(検査電極)
35 破壊検出電極用パッド(第2の電極パッド)
4 微小欠陥
100 ダイオード素子(半導体素子)
110 パワーモジュール
120 測定回路
Claims (6)
- 半導体領域と,前記半導体領域と接し電極パッドが形成される電極領域とを備えた半導体素子において,
半導体素子内に埋め込まれ,前記電極パッドのパッド面の下方に位置する検査電極と,
前記検査電極を覆う絶縁膜と,
前記検査電極と電気的に接続し,配線部材を接合する第2の電極パッドとを備えることを特徴とする半導体素子。 - 請求項1に記載する半導体素子において,
前記検査電極は,前記電極領域内に埋め込まれていることを特徴とする半導体素子。 - 半導体領域と,前記半導体領域と接し電極パッドが形成される電極領域とを備えたダイオード素子において,
ダイオード素子内に埋め込まれ,前記電極パッドのパッド面の下方に位置する検査電極と,
前記検査電極を覆う絶縁膜と,
前記検査電極と電気的に接続し,配線部材を接合する第2の電極パッドとを備えることを特徴とするダイオード素子。 - 請求項3に記載するダイオード素子において,
前記検査電極は,前記電極領域内に埋め込まれていることを特徴とするダイオード素子。 - 請求項1または請求項2に記載の半導体素子を被検体とする半導体素子の検査方法において,
前記電極領域と前記検査電極との間に検査バイアスを印加し,その際に前記電極領域と前記検査電極との間に流れたリーク電流を検出することを特徴とする半導体素子の検査方法。 - 請求項3または請求項4に記載のダイオード素子を被検体とするダイオード素子の検査方法において,
前記電極領域と前記検査電極との間に検査バイアスを印加し,その際に前記電極領域と前記検査電極との間に流れたリーク電流を検出することを特徴とするダイオード素子の検査方法。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013093500A (ja) * | 2011-10-27 | 2013-05-16 | Fuji Electric Co Ltd | 半導体装置およびその試験方法 |
WO2015068439A1 (ja) * | 2013-11-11 | 2015-05-14 | トヨタ自動車株式会社 | 電極体 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10313033A (ja) * | 1997-05-14 | 1998-11-24 | Nec Corp | 半導体装置及びその製造方法 |
JP2000012633A (ja) * | 1998-06-24 | 2000-01-14 | Mitsubishi Electric Corp | 半導体装置及びその評価方法と半導体素子の製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10313033A (ja) * | 1997-05-14 | 1998-11-24 | Nec Corp | 半導体装置及びその製造方法 |
JP2000012633A (ja) * | 1998-06-24 | 2000-01-14 | Mitsubishi Electric Corp | 半導体装置及びその評価方法と半導体素子の製造方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013093500A (ja) * | 2011-10-27 | 2013-05-16 | Fuji Electric Co Ltd | 半導体装置およびその試験方法 |
WO2015068439A1 (ja) * | 2013-11-11 | 2015-05-14 | トヨタ自動車株式会社 | 電極体 |
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