Patent ID: 7713769

Claim:
A method for fabricating a light emitting diode structure comprising: providing a substrate, forming a passivation layer on said substrate, patterning said passivation layer to define element regions covered by said passivation layer and carved regions where the surface of said substrate is exposed; placing said substrate in a first solution to form a high-density chemical reaction layer on the surface of said carved regions; selectively etching said carved regions with said passivation layer and said chemical reaction layer being a mask to form a plurality of concave zones on said carved regions without said chemical reaction layer and form a plurality of convex zones with said chemical reaction layer overhead; placing said substrate in a second solution to remove said chemical reaction layer to make the surface of said carved regions of said substrate form an irregular geometry composed of said concave zones and said convex zones, wherein the irregular geometry corresponds to the mask of said chemical reaction layer; removing said passivation layer, and thoroughly clean the surface of said substrate; epitaxially growing a semiconductor layer structure on said element regions and said carved regions with said semiconductor layer structure on said carved regions having a plurality of semiconductor concave zones and a plurality of semiconductor convex zones; and fabricating said semiconductor layer structure on said element regions into light emitting diode elements via a photolithographic process.