Patent ID: 8129818
Filing Date: 2012-03-06
Classification: H01L

Abstract:
1. A power device comprising: a first conductive type semiconductor substrate; a second conductive type base region formed on a surface of the semiconductor substrate; a second conductive type collector region formed on a rear surface of the semiconductor substrate; a first conductive type emitter region formed on a surface of the base region; a trench gate formed via a gate insulating film in a first trench groove formed in the base region so as to penetrate the emitter region; a dent formed in the base region in proximity to the emitter region; a second conductive type contact layer formed on an inner wall of the dent, having a higher dopant density than that of the base region; a dummy trench formed via a dummy trench insulating film in a second trench groove formed at a bottom of the dent; and an emitter electrode electrically connected to the emitter region, the contact layer and the dummy trench, wherein the trench gate and the dummy trench reach the semiconductor substrate.