Patent ID: 8759127
Filing Date: 2014-06-24
Classification: H01L

Abstract:
1. A method comprising: using a micromask of gold to etch down into and to roughen a surface of a gallium nitride layer, wherein an indium tin oxide (ITO) is disposed over the gallium nitride layer and patterned so as to form a mesh layer of the indium tin oxide (ITO) having a hole herein, wherein a silicon dioxide layer is disposed over the surface of the gallium nitride layer at a bottom of the hole and disposed on the indium tin oxide (ITO) layer, wherein the micromask of gold is disposed on the silicon dioxide layer at the bottom of the hole and disposed on the silicon dioxide layer on the indium tin oxide (ITO) layer, and wherein the micromask of gold is used to etch through the silicon dioxide layer into the surface of the gallium nitride layer, wherein the micromask of gold is also used to etch down into the silicon dioxide layer on the indium tin oxide (ITO) layer and form a plurality of holes in the silicon dioxide layer so as to expose a surface of the indium tin oxide (ITO) layer in the plurality of holes in the silicon dioxide layer; removing the micromask of gold from the silicon dioxide layer after using the micromask of gold to etch down into and to roughen the surface of the gallium nitride layer; and forming a metal electrode having electrical contact with the indium tin oxide (ITO) layer through the surface of the indium tin oxide (ITO) layer exposed in the plurality of holes in the silicon dioxide layer.