Patent ID: 6693338
Filing Date: 2004-02-17
Classification: H01L

Abstract:
A semiconductor device comprising:a drain layer having a first conductivity type; a first drift layer having the first conductivity type and formed on the drain layer; second drift layers having the first conductivity type and RESURF layers having a second conductivity type, which are formed on the first drift layer and periodically arranged in a direction perpendicular to a direction of depth, the RESURF layer forming a depletion layer in the second drift layer by a p-n junction including the second drift layer and RESURF layer, and the first drift layer having an impurity concentration different from that in the second drift layer; a drain electrode electrically connected to the drain layer; a base layer having the second conductivity type and selectively formed in surface regions of the second drift layer and RESURF layer; a source layer having the first conductivity type and selectively formed in a surface region of the base layer; a source electrode formed in contact with surfaces of the base layer and source layer; and a gate electrode formed on the base layer located between the source layer and the second drift layer with a gate insulating film interposed therebetween.