Patent ID: 6011278
Filing Date: 2000-01-04
Classification: H01L

Abstract:
A lateral unipolar silicon carbide (SiC) semiconductor device comprising a SiC substrate of a first conductivity type, a SiC epitaxial layer of said first conductivity type on said SiC substrate, and a SiC surface layer on said SiC epitaxial layer and having a SiC first region of said first conductivity type, a Sic lateral drift region of a second conductivity type opposite to that of the first conductivity type adjacent said first region and forming a p-n junction therewith, and a SiC second region of said second conductivity type spaced apart from said first region by said drift region, characterized in that said drift region has a varying doping level which increases in a lateral direction from said first region to said second region, and wherein said varying doping level increases in said direction from said first region to said second region initially in a linear fashion and then as a function of the square-root of the distance from said first region.