Patent ID: 7498658
Filing Date: 2009-03-03
Classification: H01L

Abstract:
1. A trench gate type insulated gate bipolar transistor comprising; a first semiconductor layer having a first conductive type; a second semiconductor layer having a 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 plurality of trenches penetrating the third semiconductor layer and reaching the second semiconductor layer, wherein the third semiconductor layer includes a plurality of first regions and a plurality of second regions, which are electrically separated by the trenches; a gate insulation film disposed on an inner wall of each trench; a gate electrode disposed on the gate insulation film in each trench; a fourth semiconductor layer having the second conductive type, wherein the fourth semiconductor layer is disposed in a surface portion of each first region of the third semiconductor layer and contacts each trench; a first electrode electrically connecting to the first region of the third semiconductor layer and the fourth semiconductor layer without electrically connecting to the second region of the third semiconductor layer; a second electrode electrically connected to the first semiconductor layer; and an outer trench, wherein