Patent ID: 8748937
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor layer of a first conductor type; a first semiconductor layer of a second conductor type, formed on the front side of the semiconductor layer; a second semiconductor layer of the second conductor type, formed on the first semiconductor layer and having a higher impurity concentration than the first semiconductor layer; a third semiconductor layer of the second conductor type, formed on the second semiconductor layer and having a lower impurity concentration than the second semiconductor layer; a first semiconductor region of the first conductor type, selectively formed in a surface layer of the third semiconductor layer; a second semiconductor region of the second conductor type, selectively formed in a surface layer of the first semiconductor region; an input electrode that contacts the second semiconductor region; a control electrode that is disposed above part of the first semiconductor region with an insulating film therebetween, the part being sandwiched by the second semiconductor region and the third semiconductor layer; and an output electrode that is disposed on the back side of the semiconductor layer.