Patent ID: 8415179
Filing Date: 2013-04-09
Classification: H01L

Abstract:
1. An LED manufacturing method comprising: providing a substrate; forming a first n-type GaN layer on the substrate; forming an AlN layer on the first n-type GaN layer, creating a pattern of the AlN layer around a rim of an upper surface of the first n-type GaN layer, removing the AlN layer from a middle region of the upper surface of the first n-type GaN layer, and exposing the middle region of the upper surface of the first n-type GaN layer; forming a second n-type GaN layer on the middle region of the upper surface of the first n-type GaN layer uncovered by the AlN layer, overlapping the second n-type GaN layer laterally with the AlN layer, creating an N-face polarity interface on a bottom surface of the second n-type GaN layer interfacing with the first n-type GaN layer; forming an active layer and a p-type GaN layer on an upper surface of the second n-type GaN layer in sequence; etching away a patterned AlN layer around the rim of the bottom face of the second n-type GaN layer with an alkaline solution; exposing the rim of the bottom surface of the second n-type GaN layer; forming roughened surfaces around the rim on the bottom surface of the second n-type GaN layer interfacing with the first n-type GaN layer with the alkaline solution to form a roughened surface; and forming an electrode on an upper surface of the p-type GaN layer.