Patent ID: 9647172
Date: 2017-05-09
CPC Classifications: H01L

Claim:
1. A light-emitting diode, comprising: a substrate; a semiconductor stack on the substrate, wherein the semiconductor stack comprises a first semiconductor layer, an active layer for emitting a light, and a second semiconductor layer; a first oxide layer on the semiconductor stack, wherein the first oxide layer has a top surface opposite to the semiconductor stack, and the top surface comprises a first region and a second region; and a first pad on the second region; wherein the first region is rougher than the second region, wherein the first oxide layer comprises an impurity, and a concentration of the impurity of the first oxide layer under the first region is higher than that of the impurity of the first oxide layer under the second region, and wherein the first oxide layer under the second region is thicker than the first oxide layer under the first region.