Patent ID: 8203150
Filing Date: 2012-06-19
Classification: H01L

Abstract:
1. A silicon carbide semiconductor substrate, comprising: a base substrate including a silicon carbide single crystal; and a silicon carbide epitaxial growth layer installed on one surface of the base substrate, wherein: the silicon carbide epitaxial growth layer includes a first semiconductor layer having a first donor concentration distribution and a second semiconductor layer having a second donor concentration distribution installed between the first semiconductor layer and the base substrate; the donor concentration of the second semiconductor layer having the second donor concentration distribution is higher than donor concentration of the first semiconductor layer at a first interface where the second semiconductor layer is in contact with the first semiconductor layer and lower than a donor concentration of the base substrate at a second interface where the second semiconductor layer is in contact with the base substrate and a donor concentration from the first interface to the second interface monotonically reduces; and the donor concentration of the first semiconductor layer at the first interface is lower than that of the base substrate at the second interface.