Patent ID: 8728861

Claim:
A method of fabricating a transparent thin film transistor, the method comprising: depositing a plurality of layers on a substrate, the plurality of layers including a transparent conductive gate contact layer, a gate insulator layer, an undoped channel layer, an etch-stop layer, and a transparent conductive contact layer, wherein the etch-stop layer is positioned between the transparent conductive contact layer and the undoped channel layer; selectively removing a portion of the transparent conductive contact layer; preventing removal of a portion of the undoped channel layer by the etch-stop layer during the selective removal of the portion of the transparent conductive contact layer; selectively removing a portion of the etch-stop layer; converting an exposed portion of the etch-stop layer from a conductor to an insulator by oxidizing the exposed portion of the etch-stop layer in air; maintaining an unexposed portion of the etch-stop layer between the transparent conductive contact layer and the undoped channel layer as a conductor; and selectively removing a portion of remaining layers of the plurality of layers to form the transparent thin film transistor.