Patent ID: 9406762
Filing Date: 2016-08-02
CPC Classification: H01L

Claim Text:
1. A semiconductor device, comprising: a substrate comprising silicon carbide; a drift layer disposed over the substrate and comprising a drift region doped with a first (n-type) dopant type, so as to have a first conductivity type; a second region adjacent to the drift region and proximal to a surface of the drift layer, wherein the second region is doped with a second (p-type) dopant type, so as to have a second conductivity type; and a junction termination extension disposed adjacent to the second region, wherein the junction termination extension has a width wjte and comprises a plurality of discrete regions separated from their nearest neighbors in a first direction and in a second direction and doped with varying concentrations of the second (p-type) dopant type, so as to have an effective doping profile of the second conductivity type of a functional form that generally decreases along a direction away from an edge of a primary blocking junction, wherein a width wjte is less than or equal to a multiple of five (5) times a width of the one-dimensional depletion width (Wdepl_1D), and wherein a charge tolerance of the semiconductor device is greater than 1.0×1013 per cm2.