Patent ID: 7498634

Claim:
A semiconductor device comprising: a substrate having a first side and a second side; an IGBT disposed in the substrate; and a diode disposed in the substrate, wherein the substrate includes a first layer having a first conductive type, a second layer having a second conductive type, a first side first conductive type region, a second side first conductive type region and a second side second conductive type region, the second layer is disposed on the first side of the first layer, and has an impurity concentration, which is reduced from the first side of the second layer to the second side of the second layer, the first side first conductive type region is disposed on the first side of the second layer, the second side first conductive type region and the second side second conductive type region are disposed on the second side of the first layer, the second side first conductive type region is adjacent to the second side second conductive type region, the substrate further includes a first trench, a second trench, a first electrode, a second electrode and a third electrode, the first electrode is embedded in the first trench through an insulation film, the first trench penetrates the first side first conductive type region and the second layer, and reaches the first layer, the first electrode provides a gate electrode of the IGBT, the second electrode is disposed on the first side first conductive type region so that the second electrode is electrically coupled with the first side first conductive type region, the second trench penetrates the first side first conductive type region, and reaches the second layer, the second trench is filled with the second electrode so that the second electrode is electrically coupled with the second layer, the second electrode provides an emitter electrode of the IGBT and an anode electrode of the diode, the third electrode is disposed on the second side first conductive type region and the second side second conductive type region so that the third electrode is electrically coupled with the second side first conductive type region and the second side second conductive type region, and the third electrode provides a collector electrode of the IGBT and a cathode of the diode.