Patent ID: 7772607
Filing Date: 2010-08-10
Classification: H01L

Abstract:
1. A GaN-series light emitting diode having a high light efficiency, comprising: a substrate; a semiconductor layer formed on said substrate and including an n-type semiconductor layer; a p-type semiconductor layer; a light emitting layer sandwiched between said n-type semiconductor layer and said p-type semiconductor layer; a reflection layer located between said light emitting layer and said n-type semiconductor layer, said reflection layer having one side thereof in contiguous contact with said light emitting layer and opposing side in contiguous contact with said n-type semiconductor layer; wherein said p-type semiconductor layer includes a p-type cladding layer, a p-type transition layer, and a p-type ohmic contact layer sequentially formed on said light emitting layer, said p-type semiconductor layer having a predetermined profile of dopant concentration extending therethrough, wherein a first concentration of dopants in said p-type cladding layer is higher than a second concentration of dopants in said p-type transition layer, and wherein a concentration of dopants in said p-type ohmic contact layer falls between said first and second concentrations of dopants; and wherein said p-type semiconductor layer has a textured surface formed during epitaxial growth of said p-type semiconductor layer as the result of a strain created in said p-type cladding layer and controlled by forming said predetermined profile of said dopants concentration, said textured surface being substantially void of hexagonally shaped defects.