Patent ID: 8759121

Claim:
A method for manufacturing an LED array comprising: providing a substrate; forming a connecting layer, an n-type GaN layer, an active layer and a p-type GaN layer on the substrate in sequence, the connecting layer, the n-type GaN layer, the active layer and the p-type GaN layer cooperatively forming a semiconductor structure, a bottom surface of the second n-type GaN layer facing towards and in connection with the connecting layer having an N-face polarity; forming grooves in the semiconductor structure and dividing the semiconductor structure into a plurality of LEDs, the grooves at least passing through the p-type GaN layer, the active layer and the n-type GaN layer to expose the connecting layer; etching a part of the connecting layer by alkaline solution to expose a portion of the bottom surface of the n-type GaN layer, and correspondingly roughening the exposed portion of the bottom surface of the n-type GaN layer during the etching; and forming electrical connections between the LEDs; wherein the alkaline solution is a strong alkaline solution, and the connecting layer and the n-type GaN layer are etched by the strong alkaline solution under a temperature of 85 degrees centigrade for 30 to 60 minutes.