Patent ID: 9496365
Filing Date: 2016-11-15
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a SiC layer; a gate insulating film provided on a surface of the SiC layer, the gate insulating film including an oxide film or an oxynitride film in contact with the surface of the SiC layer, the oxide film or the oxynitride film containing at least one element X selected from the group consisting of B (boron), Al (aluminum), Ga (gallium), In (indium), Sc (scandium), Y (yttrium), La (lanthanum), Mg (magnesium), Ca (calcium), Sr (strontium), and Ba (barium), a concentration peak of the element X in the gate insulating film being on the SiC layer side of the gate insulating film, the concentration peak of the element X being in the oxide film or the oxynitride film, the gate insulating film having a region with a concentration of the element X being not higher than 1×10 a gate electrode provided on the gate insulating film, wherein a concentration of the element X at a portion of the SiC layer adjacent to the gate insulating film is not higher than 1×10 a concentration of the element X at the concentration peak of the element is not lower than 5×10 C (carbon) is contained in the gate insulating film, a concentration peak of C (carbon) in the gate insulating film is on the SiC side of the gate insulating film and is in the oxide film or the oxynitride film, and the concentration of the element X at the concentration peak of the element is not less than 80% and not more than 120% of the concentration of the C (carbon) at the concentration peak of the C (carbon).