Patent ID: 8232570
Filing Date: 2012-07-31
Classification: H01L

Abstract:
1. A semiconductor light emitting device comprising: a p-type substrate; a p-type semiconductor layer on the p-type substrate; an undoped semiconductor layer on the p-type semiconductor layer; an active layer including a multi-quantum well (MQW) structure on the undoped semiconductor layer; and an n-type semiconductor layer on the active layer, wherein the undoped semiconductor layer is disposed between the p-type semiconductor layer and the active layer, and the p-type semiconductor layer is disposed between a top surface of the p-type substrate and a lower surface of the undoped semiconductor layer, wherein the p-type substrate is a supporting layer upon which the p-type semiconductor layer, the undoped semiconductor layer, the active layer and the n-type semiconductor layer are disposed in order, wherein the p-type substrate comprises a concave-convex pattern, the concave-convex pattern is formed on the top surface of the p-type substrate, wherein a lower surface of the p-type substrate is formed of a flat surface, wherein the p-type substrate has a thickness thicker than a height of a concave pattern of the concave-convex pattern, wherein the p-type semiconductor layer comprises nitride layers.