Patent ID: 8227868
Filing Date: 2012-07-24
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type having a top surface and a rear surface; a semiconductor layer of a second conductivity type formed on the top surface of the semiconductor substrate, having a top surface and a rear surface, and having the rear surface in contact with the top surface of the semiconductor substrate; a body region of the first conductivity type formed in a top layer portion of the semiconductor layer; a first impurity region of the second conductivity type formed in a top layer portion of the semiconductor layer and spaced apart from the body region; a second impurity region of the second conductivity type formed in a top layer portion of the body region and spaced apart from a peripheral edge of the body region; a gate electrode formed on the semiconductor layer and opposed to a portion between the peripheral edge of the body region and a peripheral edge of the second impurity region; a field insulating film formed in a portion of the top surface of the semiconductor layer between the body region and the first impurity region; and a plurality of field plates formed on the field insulating film and spaced apart from each other; and wherein a spacing between adjacent field plates is decreased as the body region is approached from the first impurity region.