Patent ID: 8652954
Filing Date: 2014-02-18
Classification: H01L

Abstract:
1. A method for manufacturing a silicon carbide semiconductor device, comprising the steps of: preparing a silicon carbide substrate; forming a silicon oxide film on said silicon carbide substrate; forming a first mask pattern of said silicon oxide film by removing a portion of said silicon oxide film by means of first etching employing a first gas containing CHF forming a first impurity region having first conductivity type by means of ion implantation of a first ion into said silicon carbide substrate including said silicon oxide film having said first mask pattern; forming a second mask pattern of said silicon oxide film by removing a portion of said silicon oxide film by means of second etching employing a second gas containing oxygen gas and at least one fluorine compound gas selected from a group consisting of CF forming a second impurity region having second conductivity type different from said first conductivity type by means of ion implantation of a second ion into said silicon carbide substrate including said silicon oxide film having said second mask pattern.