Patent ID: 9257595
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. A method of manufacturing a nitride LED, comprising a first step of providing a roughened region on a back face of a nitride semiconductor substrate having, on a front face thereof, a light-emitting structure made of a nitride semiconductor, wherein the roughened region has a plurality of protrusions, each of the plurality of protrusions has a top point or top plane and has a horizontal cross-section which is circular, except in areas where the protrusion is tangent to other neighboring protrusions, and which has a surface area that decreases on approaching the top point or top plane, the plurality of protrusions are arranged such that any one protrusion is in contact with six other protrusions, and in the first step, the roughened region is formed by dry etching treatment of the substrate.