Patent ID: 7851382

Claim:
A method for manufacturing a SiC semiconductor device comprising: forming an impurity layer in a SiC semiconductor layer; and forming an oxide film on a surface of the SiC semiconductor layer, wherein the forming the impurity layer includes: implanting an impurity in the SiC semiconductor layer; applying a cap layer made of organic solvent on the surface of the SiC semiconductor layer; annealing the cap layer and evaporating the organic solvent whereby the cap layer is carbonized and transformed into a carbon layer; annealing the SiC semiconductor layer and activating the impurity in the SiC semiconductor layer under a condition that the surface of the SiC semiconductor layer is covered with the carbon layer; removing the carbon layer; and performing a sacrifice oxidation process after the removing the carbon layer, the performing the sacrifice oxidation process includes forming a sacrifice oxide film and removing the sacrifice oxide film, the forming the oxide film on the surface of the SiC semiconductor layer is performed after the performing the sacrifice oxidation process, the removing the carbon layer includes oxidizing the carbon layer at a first temperature so that the carbon layer is removed, the first temperature is lower than a temperature at which the SiC semiconductor layer is oxidized, the forming the sacrifice oxide film includes oxidizing the SiC semiconductor layer at a second temperature so that the sacrifice oxide film is formed, the second temperature is higher than the first temperature, the oxidizing the SiC semiconductor layer is performed sequentially with the oxidizing the carbon layer whereby a temperature of the SiC semiconductor layer is increased from the first temperature to the second temperature without reducing the temperature.