Patent ID: 9385211
Filing Date: 2016-07-05
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type that includes a drift layer of the first conductivity type; a first semiconductor layer that is provided in a surface layer of a rear surface of the semiconductor substrate; a second semiconductor layer of the first conductivity type that has a higher impurity concentration than an impurity concentration of the drift layer and is provided in a region which is deeper than the first semiconductor layer on the rear surface of the semiconductor substrate; a third semiconductor layer of a second conductivity type that is provided in a surface layer of a front surface of the semiconductor substrate; an input electrode that comes into contact with the third semiconductor layer; and an output electrode that comes into contact with the first semiconductor layer, wherein, when q is an elementary charge, N when a depth of a position where a carrier concentration of the second semiconductor layer closest to the third semiconductor layer is a peak concentration from the rear surface of the semiconductor substrate is X and a thickness of the semiconductor substrate is W