Patent ID: 7291885

Claim:
A thin film transistor, comprising: a substrate; a gate, disposed on the substrate, wherein the gate comprises: a third barrier layer, disposed on the substrate; a second conductor layer, disposed on the third barrier layer; and a fourth barrier layer, covering the second conductor layer, wherein the second conductor layer is enclosed by the third barrier layer and the fourth barrier layer; a first dielectric layer, covering the gate and the substrate; a channel layer, disposed on at least a part of the first dielectric layer above the gate; a source/drain, disposed on the channel layer, the source/drain comprising a first barrier layer, a first conductor layer, and a second barrier layer, wherein the first barrier layer is disposed between the first conductor layer and the channel layer, and the first conductor layer is enclosed by the first barrier layer and the second barrier layer; and a second dielectric layer, covering the source/drain.