JP6658892B2 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- JP6658892B2 JP6658892B2 JP2018533343A JP2018533343A JP6658892B2 JP 6658892 B2 JP6658892 B2 JP 6658892B2 JP 2018533343 A JP2018533343 A JP 2018533343A JP 2018533343 A JP2018533343 A JP 2018533343A JP 6658892 B2 JP6658892 B2 JP 6658892B2
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Description
図1は、実施の形態1に係る半導体装置の平面図である。ウエハ110には半導体装置100が複数形成されている。また、ウエハ110の外周部には、グローバルアライメントマーク111が設けられている。グローバルアライメントマーク111は、外観検査の際のウエハ110の位置あわせに用いられる。また、本実施の形態では、1つの半導体装置100は9個の単位領域16に分割されている。
図20は、実施の形態2に係る半導体装置の断面図である。本実施の形態に係る半導体装置700は、無効セル712の構造以外は半導体装置100と同様である。半導体装置700は無効セル712を備える。無効セル712は半導体層212にp型のウェル713を備える。ウェル713は、無効セル712において、ドリフト層202の上面側に形成される。ウェル713は、アルミニウムをp型不純物として含む。ウェル713は、x方向の幅がWxであり、y方向の幅がWyである。WxおよびWyは、同方向のウェル203の幅よりも大きい。
図23は、実施の形態3に係る半導体装置の断面図である。本実施の形態に係る半導体装置800は、無効セル812の構造以外は半導体装置100と同様である。半導体装置800は単位領域16に隣接した2つの無効セル812を備える。隣接した無効セル812は半導体層212にp型のウェル813を備える。ウェル813は、隣接した2つの無効セル812に渡って設けられる。つまり、隣接した無効セル812は共通のウェル813を備える。ウェル813は、ドリフト層202の上面側に形成される。ウェル813は、アルミニウムをp型不純物として含む。
Claims (14)
- 主電流が流れる有効セルとなる複数の第1領域と、前記第1領域とは外観が異なり、主電流が流れない無効セルとなる第2領域と、を有する単位領域を複数形成する製造工程と、
前記単位領域を撮像し、撮像画像を得る工程と、前記第2領域を含むアライメントパターンの位置に基づき、前記撮像画像から検査画像を切り出す工程と、前記検査画像を基準画像と比較する工程と、を備えた外観検査工程と、
を備えることを特徴とする半導体装置の製造方法。 - 前記製造工程は、
前記単位領域の上に絶縁層を設ける工程と、
前記複数の第1領域の各々の上において前記絶縁層に第1開口を形成し、前記第2領域が前記絶縁層に被覆された状態を保持する第1開口工程と、
を備えることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記製造工程は、
前記単位領域の上に絶縁層を設ける工程と、
前記複数の第1領域の各々の上において前記絶縁層に第1開口を形成し、前記第2領域の上において、前記絶縁層に前記第1開口よりも幅が広い第2開口を形成する第2開口工程と、
を備えることを特徴とする請求項1に記載の半導体装置の製造方法。 - 前記第2領域は、前記単位領域の中心部に配置されることを特徴とする請求項1〜3の何れか1項に記載の半導体装置の製造方法。
- 前記複数の第1領域と前記第2領域はワイドバンドギャップ半導体を備えることを特徴とする請求項1〜4の何れか1項に記載の半導体装置の製造方法。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウム系材料またはダイヤモンドであることを特徴とする請求項5に記載の半導体装置の製造方法。
- 主電流が流れる複数の有効セルと、前記有効セルとは外観が異なり、主電流が流れない無効セルと、を有する単位領域を複数備え、
前記単位領域は隣接した複数の無効セルを備え、
前記隣接した複数の無効セルはアライメントパターンを形成することを特徴とする半導体装置。 - 前記無効セルはウェルを備えることを特徴とする請求項7に記載の半導体装置。
- 前記無効セルが備えるウェルは、前記複数の有効セルが備えるウェルよりも幅が広いことを特徴とする請求項8に記載の半導体装置。
- 前記複数の有効セルと前記無効セルは、千鳥配置であることを特徴とする請求項7に記載の半導体装置。
- 前記複数の有効セルと前記無効セルは、六角形であることを特徴とする請求項7に記載の半導体装置。
- 前記複数の有効セルはストライプ形状であり、
前記無効セルは長方形であることを特徴とする請求項7に記載の半導体装置。 - 前記複数の有効セルと前記無効セルは、ワイドバンドギャップ半導体を備えることを特徴とする請求項7〜12の何れか1項に記載の半導体装置。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウム系材料またはダイヤモンドであることを特徴とする請求項13に記載の半導体装置。
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