Patent ID: 6331455
Filing Date: 2001-12-18
Classification: H01L

Abstract:
A method of fabricating a rectifier device, comprising the steps of:providing a semiconductor substrate having a top and bottom surface;forming a plurality of pedestals on said top surface of the semiconductor substrate;forming a gate oxide on the substrate adjacent the pedestals;forming a gate layer on top of said gate oxide;forming a first spacer adjacent said pedestal sidewalls;performing a first implant into said semiconductor substrate of a dopant of a first conductivity type, the implant being laterally defined by said first spacer;removing the first spacer;forming a second spacer adjacent said pedestal sidewalls, said second spacer being thicker than said first spacer;performing a second implant into said semiconductor substrate of a dopant of a second conductivity type, said second implant being laterally defined by said second spacer;wherein said first and second implants define a plurality of channel regions adjacent said pedestals and below said gate oxide; andforming first and second electrical contact layers on said top and bottom surfaces, respectively, to provide a current flow path between said surfaces.