Patent ID: 9111844
Filing Date: 2015-08-18
Classification: H01L

Abstract:
1. A semiconductor device comprising: an n-type first SiC epitaxial layer; a p-type second SiC epitaxial layer provided on the n-type first SiC epitaxial layer, the p-type second SiC epitaxial layer containing a p-type impurity and an n-type impurity, the p-type impurity being an element A, the n-type impurity being an element D, the element A and the element D forming at least one of a first combination or a second combination, the first combination being a combination of the element A selected from a group consisting of Al (aluminum), Ga (gallium), and In (indium) and the element D being N (nitrogen), the second combination being a combination of the element A being B (boron) and the element D being P (phosphorus), a ratio of a concentration of the element D to a concentration of the element A in the at least one of the combinations being higher than 0.33 but lower than 1.0; an n-type first SiC region provided at a surface of the p-type second SiC epitaxial layer, the n-type first SiC region having a depth equal to or greater than a thickness of the p-type second SiC epitaxial layer; an n-type second SiC region provided at the surface of the p-type second SiC epitaxial layer, the n-type second SiC region being separated from the n-type first SiC region, the n-type second SiC region having a depth smaller than the thickness of the p-type second SiC epitaxial layer; a gate insulating film provided on the surface of the p-type second SiC epitaxial layer; a gate electrode provided on the gate insulating film; a first electrode provided on the n-type second SiC region; and a second electrode provided on the opposite side of the n-type first SiC epitaxial layer from the first electrode.