Patent ID: 7998848
Filing Date: 2011-08-16
Classification: H01L

Abstract:
1. A method of producing a field effect transistor having a carrier moving layer formed of material including one of group-III nitride semiconductor material, GaAs, and SiC, the method comprising: implanting impurities in a first region of the carrier moving layer; forming an insulating film on the carrier moving layer, the insulating film transmitting laser beam with which the carrier moving layer to be irradiated; forming a protective film on a second region of the carrier moving layer where the impurity is not implanted; and activating the impurity by irradiating the carrier moving layer with the laser beam, wherein the laser beam has an energy higher than a bandgap energy of the material of the carrier moving layer, the insulating film has a heat transfer rate lower than that of the protective film, the protective film has a bandgap energy lower than that of the material of the carrier moving layer, and the protective film has a thickness with which the second region of the carrier moving layer is protected from being irradiated with the laser beam.