Patent ID: 8685848
Filing Date: 2014-04-01
Classification: H01L

Abstract:
1. A manufacturing method of a silicon carbide semiconductor device, comprising the steps of: (a) preparing a first conductivity type silicon carbide substrate; (b) forming a first conductivity type epitaxial layer on one main surface of said silicon carbide substrate; (c) forming a termination structure by implanting ions of a second conductivity type impurity in an upper layer part of said epitaxial layer around a part for an electrode region; (d1) performing an annealing treatment to activate said implanted second conductivity type impurity; (d2) removing said epitaxial layer, by dry etching, from an uppermost surface to a depth of 100 to 150 nm after said annealing treatment; (d3) forming a silicon oxide film on said epitaxial layer by dry thermal oxidation; (e) forming a first metal film on another main surface of said silicon carbide substrate; (f) forming an ohmic junction between said first metal film and said other main surface of said silicon carbide substrate by performing a heat treatment on said silicon carbide substrate at a first temperature, after said step (e); (g) removing said silicon oxide film, after said step (f); (h) forming a second metal film on said epitaxial layer, after said step (g); and (i) forming a Schottky junction between said second metal film and said epitaxial layer by performing a heat treatment on said silicon carbide substrate at a second temperature, after said step (h).