Patent ID: 8633519

Claim:
A semiconductor device comprising: a first carrier transport layer formed of a Group III nitride semiconductor; a second carrier transport layer which is formed through selective re-growth of a Group III nitride semiconductor and is provided on a region of the first carrier transport layer; and a carrier supply layer formed through selective growth of a Group III nitride semiconductor having a bandgap larger than that of the Group III nitride semiconductor of the second carrier transport layer, the carrier supply layer being provided on the second carrier transport layer, wherein laminate structures comprising the second carrier transport layer and the carrier supply layer are formed on two separate regions of a surface of the first carrier transport layer, and wherein the semiconductor device further comprises: a first electrode which is provided on the carrier supply layer of one of the two separate regions and which is electrically connected to the second carrier transport layer of the same region; a second electrode which is provided on the carrier supply layer of the other region and which is electrically connected to the second carrier transport layer of the same region; an insulating film which is provided on a region of the first carrier transport layer sandwiched between the two separate regions and also on the mutually facing lateral end surfaces of the two separate laminate structures; and a control electrode formed on the insulating film.