Patent ID: 8030665

Claim:
A nitride semiconductor device, comprising: a substrate having two opposed main faces; a bonding layer placed on one main face of said substrate; a p-electrode on said bonding layer; one or more p-type nitride semiconductor layers electronically connected to the p-electrode; an active layer comprising at least a well layer of Al a In b Ga 1-a-b N, (0≦a≦1, 0≦b≦1, a+b≦1), and a barrier layer of Al c In d Ga 1-c-d N, (0≦c≦1, 0≦d≦1, c+d≦1), the active layer being on said p-type nitride semiconductor layers; n-type nitride semiconductor layers on said active layer; and an n-electrode electrically connected to one or more of said n-type nitride semiconductor layers; wherein said p-type nitride semiconductor layers, said active layer and said n-type nitride semiconductor layers are sandwiched between said p-electrode and said n-electrode, and wherein protrusions or recessions are formed on a surface of said n-type semiconductor layers, said surface being on a side where luminescence is extracted from.