SEMICONDUCTOR DEVICE

To provide a semiconductor device which can prevent an element from being broken due to flowing of a carrier from a diode region into an IGBT region and concentration of the carrier to a boundary in the time of recovery of a diode.SOLUTION: In a semiconductor device 1 that has an IGBT region 21 and...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: FURUKAWA TOMOYASU, SHIRAISHI MASAKI, NAMAI MASAKI, TAKEUCHI YUJIRO
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a semiconductor device which can prevent an element from being broken due to flowing of a carrier from a diode region into an IGBT region and concentration of the carrier to a boundary in the time of recovery of a diode.SOLUTION: In a semiconductor device 1 that has an IGBT region 21 and a diode region 22 in the same chip, an IGBT in the IGBT region 21 includes: a first conductive type drift layer 2; a second conductive type body layer 3; and a second conductive type first contact layer 5 with a higher impurity concentration than the body layer 3. A diode in the diode region 22 includes: a second conductive type first semiconductor layer 11; and a second conductive type second contact layer 12 with a higher impurity concentration than the first semiconductor layer 11. The area of the second contact layer 12 of the diode of a boundary vicinity 24 near a boundary 23 between the IGBT region 21 and the diode region 22 is less than the area of the second contact layer 12 of the diode at a position farther than the boundary vicinity.SELECTED DRAWING: Figure 1 【課題】ダイオードのリカバリ時に、ダイオード領域からIGBT領域へキャリアが流れ込んで境界部にキャリアが集中して素子が破壊されるのを抑制できる半導体装置を提供する。【解決手段】同一チップ内にIGBT領域21とダイオード領域22とを有する半導体装置1において、IGBT領域21のIGBTは、第1導電型のドリフト層2と、第2導電型のボディ層3と、ボディ層3よりも不純物濃度が高い第2導電型の第1のコンタクト層5とを有し、ダイオード領域22のダイオードは、第2導電型の第1の半導体層11と、第1の半導体層11よりも不純物濃度が高い第2導電型の第2のコンタクト層12とを有し、IGBT領域21とダイオード領域22との境界部23に近い境界部近傍24のダイオードの第2のコンタクト層12の面積は、境界部近傍よりも遠い位置のダイオードの第2のコンタクト層12の面積よりも小さい。【選択図】図1