Patent ID: 7238987
Filing Date: 2007-07-03
Classification: H01L

Abstract:
1. A lateral semiconductor device comprising: a support substrate, a buried insulating film formed on said support substrate, a first conductivity type semiconductor layer formed on said buried insulating film, a first conductivity type first semiconductor region formed on the surface of said semiconductor layer, a second conductivity type second semiconductor region formed in said semiconductor layer so as to be adjacent to or away from said first semiconductor region, a second conductivity type source region formed on the surface of said first semiconductor region, a second conductivity type drain region formed on the surface of said second semiconductor region, a gate insulating film formed between an end of said source region on the surface of said semiconductor layer and an end of said second semiconductor region, and a gate electrode formed on said gate insulating film, wherein said first semiconductor region is extended from under said source region to partly under said gate electrode, the concentration distribution of a first conductivity type impurity increases in the region ranging from the surface of said semiconductor layer to said buried insulating film and has a peak under said source region, and the impurity concentration in said semiconductor layer ranging from directly under said first semiconductor region to said buried insulating film is lower than the surface concentration in said first semiconductor region.