Patent ID: 8318589

Claim:
A method, comprising: forming a transparent conductive oxide layer over a substrate; annealing the formed transparent conductive oxide layer; etching the annealed transparent conductive oxide layer to form a roughened surface, the etching comprising exposing the annealed transparent conductive oxide layer to a wet etchant composition selected from the group consisting of: a mixture of HCl, H 2 O 2 and de-ionized water having a concentration ratio of HCl and H 2 O 2 relative to the de-ionized water of about 0.25 percent to about 10 percent; a mixture of HCl and de-ionized water having a concentration ratio of HCl relative to the de-ionized water of about 0.25 percent to about 10 percent; a mixture of HNO 3 and de-ionized water having a concentration ratio of HNO 3 relative to the de-ionized water of about 0.25 percent to about 10 percent; and a mixture of H 2 SO 4 and de-ionized water having a concentration ratio of H 2 SO 4 relative to the de-ionized water of about 0.25 percent to about 10 percent; and quenching the etched transparent conductive oxide layer by exposing the transparent conductive oxide layer to a basic solution having a pH of greater than about 10.