Patent ID: 6124613
Filing Date: 2000-09-26
Classification: H01L

Abstract:
A silicon-on-insulator structure in a field effect transistor, said structure comprising:an insulation region;a body region of a first conductivity type being selectively formed on said insulation region;a diffusion region of a second conductivity type being selectively formed on said insulation region and in one side of said body region;an isolation layer being selectively formed on said insulation region and being bounded with said diffusion region so that said diffusion region is positioned between said body region and said isolation layer;a body contact region of said first conductivity type being selectively formed on said insulation region and being bounded with said isolation layer so that said body contact region is isolated by said isolation layer from said diffusion region; andat least a carrier path silicon layer of said first conductivity type being selectively formed on said insulation region so that said carrier path silicon layer extends in contact directly with said body contact region, said diffusion region, said isolation layer and said body region,wherein an anti-silicidation layer made of a material which exhibits no silicidation reaction with a metal under a heat treatment extends over at least both said selected part of said carrier path silicon layer and a boundary portion of said diffusion region, which is bounded to and in the vicinity of said selected part of said carrier path silicon layer, andwherein a silicide layer with said metal is selectively formed so as to be separated from at least said selected part of said carrier path silicon layer, so that said channel region and said body contact region are electrically connected to each other through said carrier path silicon layer, and further so that said diffusion region is electrically isolated from said carrier path silicon layer and from said body region as well as from said body contact region, whereby any excess carriers generated in said body region are allowed to be withdrawn through said carrier path silicon layer to said body contact region.