JP6274318B2 - 半導体素子 - Google Patents
半導体素子 Download PDFInfo
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- JP6274318B2 JP6274318B2 JP2016545123A JP2016545123A JP6274318B2 JP 6274318 B2 JP6274318 B2 JP 6274318B2 JP 2016545123 A JP2016545123 A JP 2016545123A JP 2016545123 A JP2016545123 A JP 2016545123A JP 6274318 B2 JP6274318 B2 JP 6274318B2
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- 239000004065 semiconductor Substances 0.000 title claims description 37
- 239000000758 substrate Substances 0.000 claims description 63
- 239000012535 impurity Substances 0.000 claims description 27
- 239000010410 layer Substances 0.000 description 65
- 238000011084 recovery Methods 0.000 description 23
- 238000010992 reflux Methods 0.000 description 8
- 239000000969 carrier Substances 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Description
n型の導電型のことを第1導電型と称しp型の導電型のことを第2導電型と称する。本発明の実施の形態1に係る半導体素子は、IGBTと還流用のダイオード(Free Wheeling Diode(FWD))を1チップに集積したReverse-Conducting Insulated Gate Bipolar Transistor(RC-IGBT)である。図1は、本発明の実施の形態1に係る半導体素子の一部断面図である。この半導体素子は第1導電型の基板10を備えている。基板10は例えばSi、GaN、又はSiCで形成される。この基板10に、スイッチング素子領域R1の一部を構成する活性領域R2と、ダイオード領域R3が作りこまれている。
図6は、本発明の実施の形態2に係る半導体素子の一部断面図である。スイッチング素子領域R1は、活性領域R2とダイオード領域R3の間に、ゲート領域R4を有する。ゲート領域R4にはゲート電極50が形成されている。ゲート電極50は外部からゲート駆動信号を受ける部分である。ゲート領域R4には、ゲート電極50と接続されたゲート線52が設けられている。ゲート線52はゲート電極50とトレンチゲート電極20を接続する。ゲート電極50及びゲート線52の下には絶縁体54が設けられている。ゲート領域R4の基板10には第2導電型のウェル領域56が形成されている。ウェル領域56はアノード層40よりも基板10の深い位置にまで形成されている。ウェル領域56の不純物濃度はアノード層40の不純物濃度より高い。
図8は、本発明の実施の形態3に係る半導体素子の一部断面図である。第2導電型のウェル領域100は、ゲート領域R4の活性領域R2側に形成され、ゲート領域R4のダイオード領域R3側には形成されていない。また、ダイオード領域R3には、トレンチゲート電極、ゲート酸化膜及びキャリアストア領域を形成していない。そのため、ダイオード領域R3の基板10の上面側にはアノード層40だけが形成されている。
Claims (7)
- 第1導電型の基板の上面側に設けられた第1導電型のエミッタ領域と、前記基板の上面側に設けられた第2導電型のベース領域と、前記基板の下面側に設けられた第2導電型のコレクタ層と、を有する活性領域を備えたスイッチング素子領域と、
前記基板の上面側に設けられた第2導電型のアノード層と、前記基板の下面側に設けられた第1導電型のカソード層と、を有するダイオード領域と、を備え、
前記カソード層は、平面視で前記活性領域から離れており、
前記活性領域の上面側には、前記アノード層よりも不純物濃度が高い第2導電型の高濃度領域が形成され、
前記コレクタ層は前記カソード層に接し、
前記スイッチング素子領域は、前記活性領域と前記ダイオード領域の間に、ゲート電極とゲート線が形成されたゲート領域を有し、
前記ゲート領域の前記基板に形成された第2導電型のウェル領域を備え、
前記カソード層は、平面視で前記ウェル領域から離れたことを特徴とする半導体素子。 - 前記高濃度領域は、前記ベース領域であることを特徴とする請求項1に記載の半導体素子。
- 前記基板の上面に形成された上面電極と、
前記ベース領域と前記上面電極の間に設けられた、前記ベース領域よりも不純物濃度が高い第2導電型のP+コンタクト領域と、を備え、
前記高濃度領域は前記P+コンタクト領域であることを特徴とする請求項1に記載の半導体素子。 - 平面視での、前記カソード層と前記活性領域との距離は、単位をメートルとして、前記基板における秒を単位とした正孔のライフタイム×100で得られる長さ以上であり、
前記第1導電型はn型であり、前記第2導電型はp型であることを特徴とする請求項1〜3のいずれか1項に記載の半導体素子。 - 平面視での、前記カソード層と前記活性領域との距離は、前記基板の厚さの1.5倍以上であることを特徴とする請求項1〜4のいずれか1項に記載の半導体素子。
- 第1導電型の基板の上面側に設けられた第1導電型のエミッタ領域と、前記基板の上面側に設けられた第2導電型のベース領域と、前記基板の下面側に設けられた第2導電型のコレクタ層と、を有する活性領域を備えたスイッチング素子領域と、
前記基板の上面側に設けられた第2導電型のアノード層と、前記基板の下面側に設けられた第1導電型のカソード層と、を有するダイオード領域と、を備え、
前記カソード層は、平面視で前記活性領域から離れており、
前記活性領域の上面側には、前記アノード層よりも不純物濃度が高い第2導電型の高濃度領域が形成され、
前記スイッチング素子領域は、前記活性領域と前記ダイオード領域の間に、ゲート電極とゲート線が形成されたゲート領域を有し、
前記ゲート領域の前記基板に形成された第2導電型のウェル領域を備え、
前記カソード層は、平面視で前記ウェル領域から離れ、
前記ウェル領域は、前記ゲート領域の前記活性領域側に形成され、前記ゲート領域の前記ダイオード領域側には形成されないことを特徴とする半導体素子。 - 前記アノード層と前記基板の間に、前記基板よりも不純物濃度の高い第1導電型のキャリアストア領域を備えたことを特徴とする請求項1〜6のいずれか1項に記載の半導体素子。
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