Patent ID: 8772139

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: preparing a substrate composed of silicon carbide; forming an active layer on said substrate; forming a gate insulating film on said active layer; forming a gate electrode on said gate insulating film; forming a contact electrode on said active layer, in contact with said active layer; forming an interconnection on said contact electrode, in contact with said contact electrode, said step of forming an interconnection including the steps of forming a conductor film on said contact electrode, and processing said conductor film by etching said conductor film with reactive ion etching; forming a passivation film to cover said conductor film; and performing annealing or heating said substrate to a temperature not lower than 50° C. to lower a leakage current after the step of processing said conductor film, wherein said step of annealing or heating said substrate is performed after said step of forming said passivation film.