Patent ID: 8258052
Filing Date: 2012-09-04
Classification: H01L

Abstract:
1. A method of manufacturing a silicon carbide semiconductor device, comprising: selecting plural unit mask sizes based on a scattering length of ions to be implanted in a silicon carbide semiconductor layer at an implantation energy; forming an implantation mask made of a plurality of unit masks of the plural unit mask sizes on the silicon carbide semiconductor layer; and implanting the ions in said silicon carbide semiconductor layer at the implantation energy by using said implantation mask, wherein, in said selecting, the plural unit mask sizes are selected such that a length from any point in each unit mask to an end of said unit mask is equal to or less than the scattering length of the ions implanted in the silicon carbide semiconductor layer at said implantation energy and said implantation mask has a plurality of regions different from each other in terms of a size of said unit masks and an arrangement interval of said unit masks.