Patent ID: 7166874
Filing Date: 2007-01-23
Classification: B82Y,H01L,H01S

Abstract:
1. A nitride semiconductor device having a nitride semiconductor layer structure comprising: an active layer of a quantum well structure which has a first surface and a second surface and which comprises an indium-containing nitride semiconductor; a first nitride semiconductor layer which is formed to adjoin the first surface of the active layer and has a band gap energy larger than that of the active layer; a second nitride semiconductor layer which is formed on the first surface side of the active layer at a location more distant from the active layer relative to the first nitride semiconductor layer, which has a band gap energy smaller than that of the first nitride semiconductor layer and which has a thickness larger that that of the first nitride semiconductor layer; and a third nitride semiconductor layer which is formed on the first surface side of the active layer at a location more distant from the active layer relative to the second nitride semiconductor layer and which has a band gap energy larger than that of the second nitride semiconductor layer.