Patent ID: 9406837
Filing Date: 2016-08-02
CPC Classification: H01L

Claim Text:
1. A method of making light emitting diodes, comprising: providing a substrate, wherein the substrate has a first side and a second side that is opposite the first side; forming a semiconductor structure on the first side of the substrate, the semiconductor structure including a first semiconductor layer, an active layer on the first semiconductor layer and a second semiconductor layer on the active layer, wherein the active layer comprises a multiple quantum well layer, and wherein a clad layer including AlGaN is between the active layer and the second semiconductor layer; forming a transparent conductive layer on the semiconductor structure, the transparent conductive layer including ITO (indium-tin-oxide); forming a first electrode on the transparent conductive layer; forming a second electrode on the first semiconductor layer facing a same direction as the first electrode; performing backside lapping on the second side of the substrate to a substrate thickness of less than 120 μm; and polishing the lapped second side of the substrate by inductively coupled plasma reactive ion beam etching (ICPRIE), thereby making a roughness of the polished second side of the substrate to be less than 1 nm.