Patent ID: 8686442
Filing Date: 2014-04-01
Classification: B82Y,H01L,H01S

Abstract:
1. A nitride semiconductor light emitting device, comprising: a substrate selected from one of sapphire, GaN, SiC, and Si; an expitaxially-grown n-type GaN semiconductor layer formed over the substrate; a plurality of expitaxially-grown nitride semiconductor layers, formed over the n-type GaN semiconductor layer, comprising an n-type nitride semiconductor layer, a light emitting layer, and a p-type nitride semiconductor layer; a p-type electrode formed after said epitaxial growth and electrically connected to the p-type nitride semiconductor layer; and an n-type electrode formed on an exposed surface of the n-type GaN semiconductor layer after said epitaxial growth, wherein the exposed surface of the n-type GaN semiconductor layer comprises etched portions of the plurality of nitride semiconductor layers, wherein the n-type electrode comprises a first layer, a second layer, and a third layer, disposed on the exposed surface of the n-type GaN semiconductor layer, and provided in order as listed, wherein the first layer contains aluminum nitride provided in contact with the exposed surface of the n-type GaN semiconductor layer and has a thickness of at least 1 nm and less than 5 nm, wherein the second layer contains one or more metals selected from Ti, Zr, Hf, Mo, and Pt, and wherein the third layer is made of Au.