Patent ID: 6756259
Filing Date: 2004-06-29
Classification: G11C,H01L

Abstract:
Manufacturing process for a power device comprising a semiconductor layer of a first type of conductivity, wherein a body region of a second type of conductivity comprising source regions of the first type of conductivity is formed, a gate oxide layer superimposed to said semiconductor layer with an opening over said body region, polysilicon regions superimposed to said gate oxide layer, regions of a first insulating material superimposed to said polysilicon regions, regions of a second insulating material situated on side of both said polysilicon regions and said regions of a first insulating material and over zones of said gate oxide layer situated near said opening on said body region, oxide regions interposed between said polysilicon regions and said regions of a second insulating material, oxide spacers superimposed to said regions of a second insulating material;comprising growing a gate oxide layer over a semiconductor layer, a deposition of both a polysilicon layer and a first layer of a first insulating material over said gate oxide layer, selective etching and removal of both said first layer of a first insulating material and said polysilicon layer in order to obtain an opening over said gate oxide layer, first dopant ion implantation and consequent diffusion for obtaining a body region in correspondence of said opening, second dopant ion implantation and consequent diffusion for obtaining source regions, oxidation for oxide regions formation on the sidewalls of said polysilicon layer, deposition of both a layer of a second insulating material and a second layer of a first insulating material, selective etching and removal of said second layer of a first insulating material for forming oxide spacers on sides of said opening over said body region, selective etching and removal of both said layer of a second insulating material and said gate oxide layer in order to obtain a contact opening of said source regions and said body region.