Patent ID: 9716159
Date: 2017-07-25
CPC Classifications: H01L

Claim:
1. A method of manufacturing a silicon carbide semiconductor device having a trench in a semiconductor substrate made of silicon carbide, the method comprising: a first step of forming the trench in the semiconductor substrate; a second step of forming a deposition film on a surface of the semiconductor substrate and on an inner wall of the trench such that a thickness of the deposition film on the surface of the semiconductor substrate is greater than a thickness of the deposition film on the inner wall of the trench; a third step of exposing the inner wall of the trench by removing a portion of the deposition film covering the inner wall of the trench; a fourth step, after the third step, of growing a sacrificial oxide film on the inner wall of the trench by oxidation; and a fifth step of removing the deposition film and the oxide film.