Patent ID: 8252672

Claim:
A method of manufacturing a silicon carbide semiconductor device having a silicon carbide layer, comprising the steps of: implanting Al ions having an implantation concentration in a range not lower than 1E19 cm −3 and not higher than 1E21 cm −3 from a main surface of said silicon carbide layer toward the inside of said silicon carbide layer while maintaining the temperature of said silicon carbide layer between 175° C. and 300° C., to form a p-type impurity layer; annealing the silicon carbide layer after the step of implanting the ions; and forming, on the main surface of the p-type impurity layer, a contact electrode having a back surface in ohmic contact with a front surface of said p-type impurity layer on said front surface of said p-type impurity layer, the contact electrode made of a material selected from the group consisting of Ni, Ti, Al, Mo, Cr, Pt, W, Si, and TiC.