Patent ID: 8097530

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 to evaporate the organic solvent so that the cap layer is carbonized and transformed to a carbon layer; annealing the SiC semiconductor layer to activate the impurity in the SiC semiconductor layer under a condition that the surface of the SiC semiconductor layer is covered with the carbon layer; and removing the carbon layer, the forming the oxide film is performed after the removing the carbon layer, the annealing the SiC semiconductor layer includes: a first increasing of a temperature of the SiC semiconductor layer from a second temperature to a first temperature within a first time duration; a first decreasing of the temperature of the SiC semiconductor layer from the first temperature to the second temperature within a second time duration; a second increasing of the temperature of the SiC semiconductor layer from the second temperature to the first temperature within the first time duration; and a second decreasing of the temperature of the SiC semiconductor layer from the first temperature to the second temperature within the second time duration, the first temperature is equal to or higher than 1800° C., and the second temperature is lower than 1800° C., the first time duration is equal to or smaller than a predetermined time duration, and the second time duration is equal to or smaller than another predetermined time duration, and the predetermined time duration is one minute, and the another predetermined time duration is one minute.