Patent ID: 7413918
Filing Date: 2008-08-19
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor light-emitting diode (LED) device, comprising: forming a multi-layer epitaxial structure of the LED device that includes: an n-doped layer; an active layer adjacent the n-doped layer; a p-doped layer adjacent the active layer, wherein the n-doped layer is at least about four times thicker than the p-doped layer; and a metal substrate adjacent the p-doped layer, wherein both the n-doped layer and the p-doped layer include gallium nitride; providing a plurality of balls on a surface of the n-doped layer of the LED device; and roughening the surface of the n-doped layer to scatter and extract light from interior for emission out of the n-doped layer; depositing an optically transparent and electrically conductive contact layer above the plurality of balls, whereby a bias applied across the p-doped layer and the n-doped layer generates light that is emitted through the n-doped layer, scattered by the plurality of balls, and emitted to the ambient via the contact layer.