Patent ID: 6537860
Filing Date: 2003-03-25
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; forming a second spacer adjacent said pedestal sidewalls, said second spacer defining a spacing from said pedestal thicker than said first spacer; performing a second implant into said semiconductor substrate of a dopant of said first conductivity type, said second implant being laterally defined by said second spacer; performing a third implant into said semiconductor substrate of a dopant of a second conductivity type, said third implant being laterally defined by said second spacer; wherein said first and third implants define a plurality of channel regions adjacent said pedestals and below said gate oxide; and forming first and second electrical contact layers on said top and bottom surfaces, respectively, to provide a current flow path between said surfaces.