Patent ID: 6107661
Filing Date: 2000-08-22
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate having a main surface and a rear surface opposite to said main surface;a semiconductor layer of a first conductivity type disposed on said main surface of said semiconductor substrate, having an impurity concentration lower than said semiconductor substrate, and having a concave portion on a surface thereof;a body region of a second conductivity type disposed in such a manner that a an junction defined with said semiconductor layer is terminated at a sidewall of said concave portion;a source region of said first conductivity type disposed in said body region to define a channel region at said sidewall of said concave portion;a gate insulating film disposed to cover at least said channel region; anda gate electrode disposed in correspondence with said channel region with said gate insulating film interposed therebetween,wherein a planar shape of said concave portion relative to said surface of said semiconductor layer has a curvilinear corner portion.