Patent ID: 7372088
Filing Date: 2008-05-13
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor region; a first conductivity type drain region provided in a lower part of said semiconductor region; a second conductivity type body region provided on said drain region in said semiconductor region; a first conductivity type first source region provided on said body region in said semiconductor region; a first conductivity type second source region provided on said first source region in said semiconductor region so as to extend to an upper surface of said semiconductor region; a trench formed in said semiconductor region and reaching said drain region; a gate insulating film provided at least on a side surface of said trench; a gate electrode provided on said gate insulating film in said trench; and an insulating film covering an upper surface of said gate electrode in said trench, wherein an upper end of said insulating film is located lower than an upper surface of said semiconductor region.