JP2020155660A - 半導体装置および半導体装置の検査方法 - Google Patents
半導体装置および半導体装置の検査方法 Download PDFInfo
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- JP2020155660A JP2020155660A JP2019054107A JP2019054107A JP2020155660A JP 2020155660 A JP2020155660 A JP 2020155660A JP 2019054107 A JP2019054107 A JP 2019054107A JP 2019054107 A JP2019054107 A JP 2019054107A JP 2020155660 A JP2020155660 A JP 2020155660A
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Abstract
Description
実施の形態1にかかる半導体装置の構造について、縦型MOSFETを例に説明する。図1は、実施の形態1にかかる半導体装置を半導体チップ(半導体基板)のおもて面側から見たレイアウトを示す平面図である。図3は、図1の半導体チップのスクリーニング時の状態を示す平面図である。図5は、図1の半導体チップの実装後の状態を示す平面図である。図2,4,6は、それぞれ図1の切断線A1−A1’、図3の切断線A2−A2’および図5の切断線A3−A3’における断面構造を示す断面図である。
次に、実施の形態2にかかる半導体装置の構造について説明する。図14,15は、実施の形態2にかかる半導体装置の構造の一例を示す断面図である。実施の形態2にかかる半導体装置60が実施の形態1にかかる半導体装置20と異なる点は、ソースパッド21の第1部分21aの表面にめっき膜を設けることに代えて、ソースパッド21の第1部分21aの内部または下層に、ソース電極11よりも硬い材料で形成された金属膜61,61’を設けた点である。
次に、実施の形態3にかかる半導体装置の構造について説明する。図16は、実施の形態3にかかる半導体装置の構造を示す断面図である。実施の形態3にかかる半導体装置20’が実施の形態1にかかる半導体装置20と異なる点は、ソースパッド21’が、パッシベーション膜13の1つの開口部13aにおいて、半導体チップ10のおもて面に平行な方向(第1,2方向X,Y:図1では第2方向Y)に、互いに層構造の異なる3つ以上の金属層を互いに隣接させて互いに電気的に接続した構造を有する点である。
2 エッジ終端領域
10 半導体チップ
10' 半導体ウエハ
11 ソース電極
12 ゲート金属層
13 パッシベーション膜
13a,13b パッシベーション膜の開口部
14 ゲートランナー
20,20',60 半導体装置
21,21' ソースパッド
21a ソースパッドの第1部分(第2部分よりも硬い部分)
21b ソースパッドの第2部分
21c ソースパッドの第3部分
22 ゲートパッド
31,31',32,51,54 めっき膜
33 ボンディングワイヤー
41,42 プローブ針
52 レジストマスク
53,61,61',62 金属膜
X 半導体チップのおもて面に平行な方向(第1方向)
Y 半導体チップのおもて面に平行な方向でかつ第1方向と直交する方向(第2方向)
Z 厚さ方向
Claims (20)
- 半導体チップのおもて面側に設けられた所定の素子構造と、
前記半導体チップのおもて面に設けられ、前記素子構造に電気的に接続された第1電極と、
前記第1電極を覆う保護膜と、
前記保護膜の開口部に設けられた電極パッドと、
前記半導体チップの裏面に設けられた第2電極と、
を備え、
前記保護膜の開口部には、前記第1電極が露出されており、
前記電極パッドは、前記第1電極を含み、前記半導体チップのおもて面に互いに隣接して配置され互いに電気的に接続された、互いに層構造の異なる部分を2つ以上有することを特徴とする半導体装置。 - 前記電極パッドの前記互いに層構造の異なる部分のうちの第1部分は、前記第1電極と、前記第1電極よりも硬い高硬度金属膜と、を有することを特徴とする請求項1に記載の半導体装置。
- 前記高硬度金属膜は、前記第1電極に接し、かつ前記半導体チップのおもて面に平行な方向に延在していることを特徴とする請求項2に記載の半導体装置。
- 前記第1電極は、アルミニウムを含む金属膜であり、
前記高硬度金属膜は、金、銀、銅、ニッケル、コバルト、タングステン、モリブデン、チタンまたはプラチナを含む金属膜、または、これらの金属を含む金属合金膜もしくは金属積層膜であることを特徴とする請求項2または3に記載の半導体装置。 - 前記第1電極は、アルミニウム単体膜、もしくは、シリコンまたは銅を含むアルミニウム合金膜であることを特徴とする請求項4に記載の半導体装置。
- 前記高硬度金属膜は、前記第1部分の表面に設けられていることを特徴とする請求項2〜5のいずれか一つに記載の半導体装置。
- 前記高硬度金属膜は、前記第1部分の内部に設けられていることを特徴とする請求項2〜5のいずれか一つに記載の半導体装置。
- 前記高硬度金属膜は、前記第1部分と前記半導体チップとの間に設けられていることを特徴とする請求項2〜5のいずれか一つに記載の半導体装置。
- 前記高硬度金属膜は、前記半導体チップの中心を基準として前記半導体チップのおもて面に平行な少なくとも一方向に対称に配置されることを特徴とする請求項2〜8のいずれか一つに記載の半導体装置。
- 前記第1部分は、前記素子構造の電気的特性を検査する際に前記半導体チップに所定電流を流すための金属接触子が接触するパッド部であることを特徴とする請求項2〜9のいずれか一つに記載の半導体装置。
- 前記電極パッドの前記互いに層構造の異なる部分のうちの、前記第1部分を除く第2部分は、前記第1電極のみを有することを特徴とする請求項2〜10のいずれか一つに記載の半導体装置。
- 前記第2部分は、アルミニウムまたは銅を含むワイヤーが接合されるパッド部であることを特徴とする請求項11に記載の半導体装置。
- 前記ワイヤーは、複数の金属細線、または、リボン状の導電体であることを特徴とする請求項12に記載の半導体装置。
- 前記保護膜は、ポリイミド膜、窒化シリコン膜または酸化シリコン膜であることを特徴とする請求項1〜13のいずれか一つに記載の半導体装置。
- 前記半導体チップは、炭化珪素からなることを特徴とする請求項1〜14のいずれか一つに記載の半導体装置。
- 請求項2に記載の半導体装置の検査方法であって、
前記電極パッドの前記第1部分に金属接触子を接触させて電気的に接続し、前記金属接触子を介して前記半導体チップに電流を流して前記素子構造の電気的特性を検査する検査工程を含むことを特徴とする半導体装置の検査方法。 - 前記検査工程では、前記半導体チップに300A/cm2以上の電流を流すことを特徴とする請求項16に記載の半導体装置の検査方法。
- 前記素子構造は、絶縁ゲート型バイポーラトランジスタの金属−酸化膜−半導体の3層構造からなる絶縁ゲート構造であり、
前記検査工程では、前記絶縁ゲート型バイポーラトランジスタのコレクタ領域とドリフト領域とのpn接合で形成された寄生ダイオードに順方向に電流を流すことを特徴とする請求項16または17に記載の半導体装置の検査方法。 - 前記検査工程を複数回行うことを特徴とする請求項16〜18のいずれか一つに記載の半導体装置の検査方法。
- 前記半導体チップは、炭化珪素からなることを特徴とする請求項16〜19のいずれか一つに記載の半導体装置の検査方法。
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