Patent ID: 8471288

Claim:
A Group III nitride semiconductor light-emitting device, comprising: a support; a p-electrode provided on the support; a p-type layer comprising a Group III nitride semiconductor and provided on the p-electrode; an active layer comprising a Group III nitride semiconductor and provided on the p-type layer; an n-type layer comprising a Group III nitride semiconductor and provided on the active layer; an n-electrode which is electrically connected to the n-type layer; a first trench having a depth extending from a lower surface of the p-type layer on a side of the p-electrode to reach the n-type layer; an auxiliary electrode which is in contact with a lower surface of the n-type layer at a bottom of the first trench, but is not in contact with side walls of the first trench; an insulating film which exhibits light permeability and is provided to cover the auxiliary electrode and the bottom and side walls of the first trench; and a second trench which is provided in a region facing a portion of the auxiliary electrode in a direction perpendicular to a main surface of the device, and which has a depth extending from an upper surface of the n-type layer on a side opposite the side of the p-electrode to the auxiliary electrode, wherein the n-electrode comprises only a pad portion and is provided on a portion of the auxiliary electrode exposed through the second trench.