Patent ID: 9379225
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A semiconductor device in which an IGBT region and a diode region are formed on one semiconductor substrate, the IGBT region comprising: a body layer of a first conductivity type that is formed on a front surface of the semiconductor substrate; a body contact layer of the first conductivity type that is partially formed on a front surface of the body layer, the body contact layer having a higher impurity concentration of the first conductivity type than the body layer; an emitter layer of a second conductivity type that is partially formed on the front surface of the body layer; a drift layer of the second conductivity type that is formed on a back surface side of the body layer; a collector layer of the first conductivity type that is formed on a back surface side of the drift layer; and a gate electrode covered with an insulator film and placed inside a trench, wherein a part of the body contact layer placed at a long distance from the diode region is made larger than a part of the body contact layer placed at a short distance from the diode region.