JP6099807B2 - 半導体装置、及び、その試験方法 - Google Patents
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Description
<半導体装置の構成>
図1は、本発明の実施の形態1に係る半導体装置1の概略構成を示す平面図であり、図2は、図1のA−A線に沿った断面図である。ここでは、半導体装置1として、図1の面外方向、つまり図2の縦方向(Z方向)に流れる大きな電流をオンまたはオフする縦型構造の半導体装置を例にして説明し、特に縦型構造の半導体装置として、IGBT(Insulated Gate Bipolar Transistor)を例にして説明する。しかし、本実施の形態に係る半導体装置1は、これに限るものではなく、例えば、IGBT以外の半導体装置であってもよいし、水平方向に沿って設けられた横型構造の半導体装置などであってもよい。
図5は、以上に説明した縦型構造の半導体装置1の電気的特性の評価を行う半導体評価装置5の概略構成を示す側面図である。ここでは、半導体評価装置5は、一つのウェハ1aに形成された複数の半導体装置1の電気的特性の評価を、一つの半導体装置1ごとに行うものとする。
図6は、本実施の形態1に係る半導体装置1の試験方法を説明するための上面図である。なお、本実施の形態1では、上述したように、一つのウェハ1aに形成された複数の半導体装置1の電気的特性の評価を、一つの半導体装置1ごとに行うものとする。
以上のような本実施の形態1に係る半導体装置及びその試験方法によれば、電極パッド12とコンタクトプローブ52とを接触させた場合のコンタクトプローブ52同士の間の距離よりも、導電層14とコンタクトプローブ52とを接触させた場合のコンタクトプローブ52同士の間の距離のほうが長くなっている。したがって、コンタクトプローブ52同士の間の距離を長くすることができるので、電気的な評価時における放電を抑制することができる。
本実施の形態1では、二つのエミッタ電極12aには、互いに離間する二つの導電層14がそれぞれ電気的に接続されているように構成されている。つまり、エミッタ電極12aと導電層14とが一対一で構成されている。しかし、二つのエミッタ電極12aが基本的に同電位となる場合には、二つのエミッタ電極12a(予め定められたいくつかの電極パッド12)が、一つの導電層14によって互いに電気的に接続(連結)されてもよい。このような構成によれば、領域の選択性が容易となり、工程の容易化が期待できる。また、電気的な評価時における電流集中ひいては発熱の抑制効果も期待できる。
図7は、本発明の実施の形態2に係る半導体装置1の概略構成を示す平面図であり、図8は、図7のA−A線に沿った断面図である。なお、本実施の形態2に係る半導体装置1において、以上で説明した構成要素と同一または類似するものについては同じ参照符号を付し、異なる部分について主に説明する。
これまでの実施の形態では、半導体装置1は、1層から構成された保護膜13を備えたが、本発明の実施の形態3では、半導体装置1は、複数の層から構成された絶縁性の保護膜を備えている。
Claims (13)
- 平面視において互いに隣接する素子領域及び終端領域を有する半導体基体と、
前記半導体基体の前記素子領域のうち、前記終端領域から離間した領域上に配設された複数の電極パッドと、
前記半導体基体の前記素子領域及び前記終端領域上に配設され、各前記電極パッド上に開口部が設けられた絶縁性の保護膜と、
前記保護膜上に配設され、前記開口部を介して前記複数の電極パッドとそれぞれ電気的に接続された複数の導電層と
を備え、
平面視において、各前記導電層は前記終端領域またはその近傍まで延設され、
各前記電極パッドに対応して、複数の前記開口部が前記保護膜に設けられ、
一つの前記電極パッドに対応して設けられた複数の前記開口部のそれぞれに対応して、前記導電層が一つずつ配設された、半導体装置。 - 請求項1に記載の半導体装置であって、
予め定められたいくつかの前記電極パッドが、一つの導電層によって互いに電気的に接続されている、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
平面視において、各前記導電層は前記素子領域及び前記終端領域の境界まで延設している、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
平面視において、任意の二つの前記導電層の間の距離は、当該二つの導電層にそれぞれ電気的に接続された二つの前記電極パッドの間の距離よりも大きい、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
前記電極パッド及び前記導電層は、透明導電膜から構成される、半導体装置。 - 請求項5に記載の半導体装置であって、
前記透明導電膜は酸化亜鉛を含む、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
前記保護膜は、材料が異種または同種である複数の層から構成される、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
前記保護膜は、フォトレジストまたはポリイミドシートを含む、半導体装置。 - 請求項8に記載の半導体装置であって、
前記保護膜がポリイミドシートを含む場合に、前記ポリイミドシートには接着層が設けられている、半導体装置。 - 請求項1または請求項2に記載の半導体装置であって、
前記電極パッド下に配設された第1バリアメタル、及び、前記導電層下に配設された第2バリアメタルの少なくともいずれか一つをさらに備える、半導体装置。 - 請求項10に記載の半導体装置であって、
前記第1及び第2バリアメタルは、タングステンシリサイド(WSi)を含む、半導体装置。 - 半導体装置を試験する試験方法であって、
前記半導体装置は、
平面視において互いに隣接する素子領域及び終端領域を有する半導体基体と、
前記半導体基体の前記素子領域のうち、前記終端領域から離間した領域上に配設された複数の電極パッドと、
前記半導体基体の前記素子領域及び前記終端領域上に配設され、各前記電極パッド上に開口部が設けられた絶縁性の保護膜と、
前記保護膜上に配設され、前記開口部を介して前記複数の電極パッドとそれぞれ電気的に接続された複数の導電層と
を備え、
平面視において、各前記導電層は前記終端領域またはその近傍まで延設され、
前記半導体装置の試験方法は、
(a)前記複数の導電層の前記終端領域近傍の部分にそれぞれ複数のプローブを接触させる工程と、
(b)前記工程(a)の後、前記複数のプローブ及び前記複数の導電層を介して、前記複数の電極パッドに電気の入出力を行う工程と
を備える、半導体装置の試験方法。 - 請求項12に記載の半導体装置の試験方法であって、
一つのウェハに形成された複数の前記半導体装置に対して一律に前記工程(a)が行われた後に、前記複数の半導体装置に対して一律に前記工程(b)が行われる、半導体装置の試験方法。
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