Patent ID: 6717210
Filing Date: 2004-04-06
Classification: H01L

Abstract:
A trench gate type semiconductor device comprising:a first semiconductor layer having first and second main surfaces; a second semiconductor layer of a first conductivity type as formed on said first main surface of said first semiconductor layer; a third semiconductor layer of a second conductivity type as formed on said second semiconductor layer; a fourth semiconductor layer of the first conductivity type as formed at a surface of said third semiconductor layer; a gate electrode having a polycrystalline silicon layer being buried in a trench formed to a depth reaching said second semiconductor layer from a surface of said fourth semiconductor layer with a gate insulating film interposed therebetween and having an upper end portion protruding upwardly from a trench upper end opening while having its width greater than a width of said trench and a metal silicide film formed at an upper surface and side surfaces of said upper end portion of said polycrystalline silicon layer; a first main electrode in contact with both said fourth semiconductor layer and said third semiconductor layer; and a second main electrode formed at said second main surface of said first semiconductor layer.