Patent ID: 7361954

Claim:
A power semiconductor device, comprising: a gate electrode having a cross section having a length in a vertical direction, the gate electrode having a shape extending in a direction orthogonal to the cross section; a gate insulating film surrounding the gate electrode; an n-type source layer positioning to face the gate electrode via a part of the gate insulating film; a p-type base layer adjacent to the n-type source layer and positioning to face the gate electrode via another part of the gate insulating film; an n-type base layer adjacent to the p-type base layer and positioning to face the gate electrode via still another part of the gate insulating film without being in contact with the n-type source layer; and a main electrode being in contact with the n-type source layer with a first lateral plane and in contact with the p-type base layer with a second lateral plane, the first lateral plane and the second lateral plane extending as a single lateral plane in a direction crossing the direction in which the gate electrode is extending.