Patent ID: 8796123
Filing Date: 2014-08-05
Classification: H01L

Abstract:
1. A method of manufacturing a silicon carbide semiconductor device, comprising the steps of: forming a mask layer having an opening on a silicon carbide substrate; implanting an impurity of a first conductivity type onto said silicon carbide substrate through said opening in said mask layer; forming a first film made of a first material, which does not substantially contain a metal element, on said silicon carbide substrate to cover said mask layer; forming a second film made of a second material different from said first material, on said silicon carbide substrate to cover said mask layer and said first film; performing anisotropic etching for removing a portion of said second film; sensing an exposed part of said first film during said anisotropic etching; stopping said anisotropic etching after sensing said first film; implanting an impurity of a second conductivity type onto said silicon carbide substrate using said second film as a mask after said step of stopping said anisotropic etching; and removing said mask layer, said first film, and said second film.