Patent ID: 7888270
Filing Date: 2011-02-15
Classification: H01L

Abstract:
1. A method for etching a gallium nitride semiconductor having a hexagonal cone shape formed thereon by using a lateral etching process, comprising: providing a semiconductor substrate, forming a first gallium nitride layer on the semiconductor substrate, forming a dielectric layer discontinuously on a surface of the first gallium nitride layer, forming a second gallium nitride layer on the dielectric layer and the first nitride layer, wherein a thickness of the second gallium nitride layer being thicker than that of the first gallium nitride layer; first, using a lateral etching process to remove the dielectric layer; second, using the lateral etching process to remove the second gallium nitride layer on the dielectric layer to form as a hole; third, using the lateral etching process to remove the second gallium nitride layer for expanding the hole, so as to form a specific shape of the second gallium nitride layer; and removing the semiconductor substrate and the first gallium nitride layer, so that a hexagonal cone shape is formed on the second gallium nitride semiconductor.