Patent ID: 6933565
Filing Date: 2005-08-23
Classification: H01L

Abstract:
1. A semiconductor device comprising: an SOI substrate including a substrate having an insulative surface and a semiconductor layer provided on said surface of said substrate, said semiconductor layer having a first active region of a first conductivity type and a second active region of the first conductivity type both of which are provided in a main surface thereof; an isolation insulating film formed between said first and second active regions in said main surface of said semiconductor layer, leaving a first semiconductor region which is part of said semiconductor layer between the isolation insulating film and said surface of said substrate; a first oxide film formed on said first and second active regions; a silicon nitride film formed on all upper surfaces of said first oxide film and a surface of said isolation insulating film; a second oxide film formed on a surface of said silicon nitride film; and at least one wire formed on said second oxide film, wherein said substrate includes a semiconductor substrate and a buried insulating film entirely provided on a main surface of said semiconductor substrate, said semiconductor device further comprising: first source region and drain region of a second conductivity type formed in said main surface of said semiconductor layer of said first active region separated from each other; a first gate electrode formed on said main surface of said semiconductor layer with a first gate insulating film interposed therebetween as to oppose a region sandwiched between said first source region and drain region; a first impurity region of the first conductivity type formed in said second active region, being electrically connected to said region sandwiched between said first source region and drain region through said first semiconductor region below said isolation insulating film; and a first wire, a second wire and a third wire connected to said first source region and drain region and said first impurity region through contact holes which are formed as to penetrate said first and second oxide films and said silicon nitride film, respectively.