Patent ID: 7667269
Filing Date: 2010-02-23
Classification: H01L

Abstract:
1. A trench gate type semiconductor device comprising: a first semiconductor layer having a first conductive type or a second conductive type; a second semiconductor layer having the second conductive type and disposed on a surface of the first semiconductor layer; a third semiconductor layer having the first conductive type and disposed on a surface of the second semiconductor layer; a fourth semiconductor layer having the second conductive type and disposed in a part of a surface portion of the third semiconductor layer; a trench penetrating from the surface of the third semiconductor layer through the fourth semiconductor layer and the third semiconductor layer and reaching the second semiconductor layer; a gate insulation film disposed on an inner wall of the trench; a gate electrode disposed on the gate insulation film in the trench; a first electrode electrically connected to the third semiconductor layer and the fourth semiconductor layer; and a second electrode electrically connected to the first semiconductor layer, wherein