Patent ID: 6650001
Filing Date: 2003-11-18
Classification: H01L

Abstract:
A lateral semiconductor device comprising:a first conductivity type base layer having resistance higher than that of a first conductivity type buffer layer; said first conductivity type buffer layer selectively formed in the surface portion of said first conductivity type base layer; a second conductivity type drain layer selectively formed in the surface portion of said first conductivity type buffer layer; a second conductivity type base layer selectively formed in the surface portion of said first conductivity type base layer so as to surround said first conductivity type buffer layer with a spacing therebetween; a first conductivity type source layer selectively formed in the surface portion of said second conductivity type base layer; a gate electrode formed via a gate insulating film on the surface of said second conductivity type base layer sandwiched between said first conductivity type base layer and said first conductivity type source layer; a source electrode in contact with said second conductivity type base layer and said first conductivity type source layer; and a drain electrode in contact with said second conductivity type drain layer, wherein said second conductivity type drain layer has a structure in which said first conductivity type buffer layer not in contact with said drain electrode is exposed in a portion of said second conductivity type drain layer.