Patent ID: 8308963

Claim:
A method of fabricating a thin film transistor, comprising: forming first metal layers including at least two different metal layers on a substrate; forming a gate electrode and a gate line by etching with an etchant comprising hydrogen peroxide (H 2 O 2 ) and one of carboxylic acid, carboxylate salt, and acetyl group (CH 3 CO—); forming a gate insulation layer on the substrate to cover the gate electrode and the gate line; sequentially forming an active layer and an ohmic contact layer on the gate insulation layer; forming second metal layers including the at least two different metal layers on the substrate; etching the second metal layers to form a source electrode and a drain electrode; forming a protective layer to cover the source electrode and the drain electrode on the gate insulation layer with a contact hole for exposing the drain electrode; and forming a pixel electrode connected to the drain electrode through the contact hole.