Patent ID: 8604470

Claim:
A method for fabricating an oxide thin film transistor (TFT), the method comprising: forming a gate electrode made of a first conductive film on a substrate; forming a gate insulating layer on the substrate with the gate electrode formed thereon; forming an active layer made of oxide semiconductor on the gate insulating layer; forming an interlayer and a second conductive film on the substrate with the active layer formed thereon, wherein the interlayer is made of a different material from that of the second conductive film, to adjust a threshold voltage according to the difference in a work function; forming a contact layer on the substrate with the active layer formed thereon and forming source and drain electrodes, which are electrically connected with source and drain regions of the active layer through the contact layer, on the contact layer by selectively etching the interlayer and the second conductive film, wherein a back channel region of the active layer is partially etched simultaneously with the interlayer; forming a protective layer on the substrate with the source and drain electrodes formed thereon; forming a contact hole by removing the protective layer to expose the drain electrode; and forming a pixel electrode electrically connected with the drain electrode through the contact hole.