Patent ID: 8981420
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A nitride semiconductor light emitting device comprising: a substrate, an n-type nitride semiconductor layer formed on the substrate, an active layer formed on the n-type nitride semiconductor layer, a p-type nitride semiconductor layer on the active layer, a conductive oxide film on the p-type nitride semiconductor layer; and a p-side pad electrode on the conductive oxide film, wherein: the p-side pad electrode comprises a junction layer and a pad layer, the junction layer comprises a first metal film, said first metal film being made of a first metal, the first metal film is located directly on the conductive oxide film, the pad layer comprises a second metal which is different from the first metal, a surface of the conductive oxide film in contact with the first metal film is an irregular surface, the first metal film has a thickness smaller than an average surface roughness Ra of the irregular surface, and the first metal film that contacts said irregular surface of the conductive oxide film has: one portion of the first metal film that is located in a recess of the irregular surface of the conductive oxide film, said one portion of the first metal film being oxidized, and another portion of the first metal film that is located on a protrusion of the irregular surface of the conductive oxide film, said another portion of the first metal film not being oxidized.