Patent ID: 8969883
Filing Date: 2015-03-03
Classification: H01L,Y10S

Abstract:
1. A light emitting device, comprising: an n-type conductive semiconductor layer; an active layer formed on the n-type conductive semiconductor layer; a p-type conductive semiconductor layer formed on the active layer and having a Ga vacancy; a high concentration p-type GaN-based semiconductor layer configured to directly contact the p-type conductive semiconductor layer; a first metal-Ga compound layer functioning as a first diffusion barrier; a first metal layer formed on the first metal-Ga compound layer; a third metal-Al compound layer configured to directly contact the first metal layer and functioning as a second diffusion barrier, the third metal being one selected from the group consisting of Ni, Pt and Pd; and a conductive oxidation preventive layer formed on the third metal-Al compound layer, wherein the high concentration p-type GaN-based semiconductor layer has a higher concentration of Ga material than the p-type conductive semiconductor layer, wherein the high concentration p-type GaN-based semiconductor layer comprises a carrier concentration higher than a carrier concentration of the p-type conductive semiconductor layer, wherein the first metal-Ga compound layer is disposed between the first metal layer and the high concentration p-type GaN-based semiconductor layer, wherein the third metal-Al compound layer contacts both a top surface of the first metal layer and a bottom surface of the conductive oxidation preventive layer, and wherein the first metal-Ga compound layer comprises a compound material of the p-type conductive semiconductor layer and a metal material of the first metal layer.