Patent ID: 8901570
Filing Date: 2014-12-02
Classification: C30B,H01L

Abstract:
1. An epitaxial silicon carbide single crystal substrate, comprising: a silicon carbide single crystal substrate having an off-angle of 1 to 6°, and a silicon carbide epitaxial film formed on the silicon carbide single crystal substrate by use of a chemical vapor deposition method, wherein the epitaxial film has two or more doped layers and two or more non-doped layers, and is formed by alternately stacking a doped layer having a thickness of 0.5 μm or less and being formed while adding an impurity element; and a non-doped layer having a thickness of 0.1 μm or less and being formed without the addition of an impurity element, in order of the non-doped layer and the doped layer from the silicon carbide single crystal substrate, wherein the doped layer is formed by setting the ratio of numbers of carbon and silicon atoms (C/Si) contained in a raw material gas for epitaxial film to be 1.5 or more and 2.0 or less, and the non-doped layer is formed by setting the ratio of numbers of carbon and silicon atoms (C/Si) contained in a raw material gas for epitaxial film to be 0.5 or more and less than 1.5, wherein the thickness of the doped layer is larger than the thickness of the non-doped layer, and wherein the density of doping atom number of the doped layer is 1×10