Patent ID: 7847345
Filing Date: 2010-12-07
Classification: H01L

Abstract:
1. An insulated gate semiconductor device comprising: a semiconductor substrate of a first conductivity type having a first major surface and a second major surface, a first semiconductor layer of a second conductivity type provided on the first major surface of the semiconductor substrate in the vicinity of at least one first region of the semiconductor substrate and at least one second region of the semiconductor substrate adjacent to the first region, a plurality of first trenches provided in the first region and penetrating the first semiconductor layer from the first major surface of the semiconductor substrate, a second semiconductor layer of the first conductivity type selectively provided in the vicinity of the plurality of first trenches on the first major surface of the semiconductor substrate and in the first region, an insulating film coating the inner surfaces of the plurality of first trenches, a conductive film buried in the first trenches through the insulating film, a first major electrode provided on the first semiconductor layer and the second semiconductor layer, and electrically connected to the first semiconductor layer, an entire third semiconductor layer of the second conductivity type provided on the second major surface of the semiconductor substrate and aligned with the first region, a fourth semiconductor layer of the first conductivity type provided on the second major surface of the semiconductor substrate, and a second major electrode coating the third semiconductor layer and the fourth semiconductor layer, and provided on the second major surface of the semiconductor substrate.