Patent ID: 8569123

Claim:
A method for manufacturing a silicon carbide Schottky diode, the method comprising: (a) implanting ions, in an ion implantation, in a silicon carbide layer having a (0001) silicon surface or a (000-1) carbon surface to obtain an ion-implanted silicon carbide layer; (b) annealing, in an activation annealing, the ion-implanted silicon carbide layer to obtain an annealed silicon carbide layer; (c) removing a first surface layer of the annealed silicon carbide layer by a dry etching to obtain a dry etched silicon carbide layer; (d) forming a sacrificial oxide film on a second surface layer of the dry etched silicon carbide layer by performing sacrificial oxidation thereto; (e) removing the sacrificial oxide film by wet etching; and (f) forming a Schottky electrode on the surface layer from which the sacrificial oxide has been removed, wherein a thickness of the first surface layer removed by the dry etching is from 120 nm to 240 nm, wherein a thickness of 20 nm to 40 nm of the second surface layer is removed by the forming and removing of the sacrificial oxide film, and wherein the activation annealing comprises forming a graphite film on a surface of the ion-implanted silicon carbide layer.