Patent ID: 9184276
Filing Date: 2015-11-10
Classification: H01L

Abstract:
1. A method of manufacturing a silicon carbide semiconductor device, comprising the steps of: performing an ion implantation into a silicon carbide semiconductor to form a well region and a source region in the well region; performing an activation annealing treatment to said silicon carbide semiconductor after performing said ion implantation into said silicon carbide semiconductor; forming a first oxide film which is in contact with said well region and said source region on a first surface of a silicon carbide semiconductor; removing said first oxide film; and forming a second oxide film constituting said silicon carbide semiconductor device on a second surface exposed as a result of removal of said first oxide film in said silicon carbide semiconductor, said second oxide film being directly and physically in contact with said well region, between said step of removing said first oxide film and said step of forming a second oxide film, said silicon carbide semiconductor being arranged in an atmosphere cut off from an ambient atmosphere, and said step of removing said first oxide film comprising the step of etching using a gas including at least one selected from the group consisting of a hydrogen gas, a hydrogen chloride gas, a sulfur fluoride gas, and a carbon fluoride gas, at a temperature not lower than 800° C. and not higher than a temperature of sublimation of silicon carbide, in said step of forming a first oxide film, a damaged layer formed by said step of performing said activation annealing treatment and formed on said first surface of said silicon carbide semiconductor is oxidized.