Patent ID: 7166890
Filing Date: 2007-01-23
Classification: H01L

Abstract:
1. A superjunction semiconductor device, comprising: a semiconductor body region having a first conductivity of N-type; a plurality of layers, each layer comprising a plurality of vertically aligned regions forming spaced pylons having a second conductivity of P-type extending along a portion of a thickness of the body region, a distance between two adjacent pylons is larger than a width of the pylon; each of the pylons having a MOSgated structure with a source region disclosed in a channel region positioned above and in contact with the pylon; a majority portion of each of the pylons being in a charged balance with the body region surrounding the pylon; and a top portion of the pylon near the MOSgated structure having a dimension approximately 2% greater than that of a remainder of the pylon, wherein the top portion of the pylon is out of charge balance with the surrounding body region.