Patent ID: 6271564
Filing Date: 2001-08-07
Classification: H01L

Abstract:
A semiconductor device, comprising:a semiconductor substrate comprising a major surface of a first conductivity type, a pair of low-concentration semiconductor layers of a second conductivity type selectively formed in said major surface separately from each other and a pair of high-concentration semiconductor layers of the second conductivity type selectively formed in said major surface separately from each other, having opposed edges recessed from opposed edges of said pair of low-concentration semiconductor layers, being deeper and higher in concentration then said pair of low-concentration semiconductor layers;a first insulating film formed immediately on said major surface;a gate electrode so formed on said first insulating film as to face a region between said opposed edges of said pair of low-concentration semiconductor layers;a pair of main electrodes connected to said pair of high-concentration semiconductor layers, respectively;insulating sidewalls covering opposed sides of said gate electrode and each extending a sidewall distance from a corresponding opposed side of the gate electrode over a portion of said first insulating film adjacent to said gate electrode; anda second insulating film whose main component is different from that of said insulating sidewalls, extending over a top surface of said gate electrode and down along each said opposed side of said gate electrode so as to isolate said gate electrode from said insulating sidewalls, said second insulating film further extending said sidewall distance over said portion of said first insulating film so as to isolate said first insulating film from said insulating sidewalls and not as to extend off said sidewalls.