Patent ID: 8324631

Claim:
A method for manufacturing a silicon carbide semiconductor device comprising: alternating laminating a plurality of first and second silicon carbide epitaxial layers sequentially on a first conductivity type silicon carbide substrate, wherein each of the plurality of first and second silicon carbide epitaxial layers is of the first conductivity type, the plurality of first silicon carbide epitaxial layer of the first conductivity type consists of a first type of impurity dopants, the plurality of second silicon carbide epitaxial layer of the first conductivity type consists of a second type of impurity dopants, the plurality of first and second silicon carbide epitaxial layers are formed with mutually exclusive types of impurity dopants such that the first silicon carbide epitaxial layer does not contain the type of impurity dopants used in the adjacent second silicon carbide epitaxial layer and the second silicon carbide epitaxial layer does not contain the type of impurity dopant used in the adjacent first silicon carbide epitaxial layer; and wherein the impurity concentrations between an adjacent pair of first and second silicon carbide epitaxial layers are different from each other.