Patent ID: 7456484
Filing Date: 2008-11-25
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate having an IGBT region and a diode region; an IGBT disposed in the IGBT region of the substrate; a diode disposed in the diode region of the substrate; and a resistive region, wherein the semiconductor substrate has a first side and a second side opposite to the first side, the semiconductor substrate includes a first semiconductor layer having a first conductive type and a second semiconductor layer having the first conductive type, the second semiconductor layer has an impurity concentration higher than an impurity concentration of the first semiconductor layer, the second semiconductor layer is disposed on the first semiconductor layer on the second side in the IGBT region, the IGBT includes a collector region having a second conductive type, a collector electrode, a base region having the second conductive type, an emitter region having the first conductive type, an emitter electrode, a channel region, and a gate electrode, the collector region is disposed on the second semiconductor layer on the second side in the IGBT region, the collector electrode is electrically coupled with the collector region, the base region is disposed in a surface portion of the first semiconductor layer on the first side in the IGBT region, the emitter region is disposed in a surface portion of the base region, the emitter electrode is electrically coupled with the emitter region, the channel region is disposed in a part of the base region between the emitter region and the first semiconductor layer, the gate electrode contacts the channel region through a gate insulation film, the diode includes an anode region having the second conductive type, an anode electrode, and a cathode electrode, the anode region is disposed in a surface portion of the first semiconductor layer on the first side in the diode region, the anode electrode is electrically coupled with the anode region and the emitter electrode, the cathode electrode is disposed on the first semiconductor layer on the second side in the diode region, the cathode electrode is electrically coupled with the collector electrode, and the resistive region for increasing a resistance of the second semiconductor layer is disposed in a part of the second semiconductor layer, which is arranged in a current path between the channel region in the IGBT region and the cathode electrode in the diode region through the first semiconductor layer and the second semiconductor layer with bypassing the collector region.