Patent ID: 8928022
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A light-emitting device, comprising: a semiconductor contact layer having a rough top surface, wherein the rough top surface comprises any two adjacent crests having a highest point respectively and a trough having a lowest point between the two adjacent crests; and a transparent current spreading layer having a top surface on the semiconductor contact layer; wherein the top surface of the transparent current spreading layer comprises any two adjacent crests having a highest point respectively and a trough having a lowest point between the two adjacent crests; wherein the rough top surface of the semiconductor contact layer is substantially directly under the top surface of the transparent current spreading layer; wherein two oblique lines formed by connecting the highest points and the lowest point of the rough top surface on the semiconductor contact layer, and a first angle θ wherein two oblique lines formed by connecting the highest points and the lowest point of the top surface on the transparent current spreading layer, and a second angle θ wherein a difference between the first angle θ