Patent ID: 8735229

Claim:
A method of manufacturing a thin film transistor (TFT), the method comprising: forming a channel layer comprising ZnO on a substrate; forming an oxide layer containing unbonded free oxygen or incompletely bonded oxygen on the channel layer by using low temperature plasma enhanced chemical vapor deposition (LT-PECVD) performed at a temperature of about room temperature to about 250° C., the oxide layer being formed of an oxygen-rich oxide of which the oxygen content is greater than an oxygen content of the same oxide which is not oxygen-rich, wherein the oxide layer directly contacts the ZnO of the channel layer; and annealing the channel layer and the oxide layer, wherein the annealing of the channel layer and the oxide layer allows the oxygen of the oxide layer to be introduced to the channel layer, thereby inducing an interfacial reaction between the channel layer and the oxide layer and reducing carrier concentration in the channel layer, and wherein the LT-PECVD is performed at a pressure equal to or greater than about 2.5 Torr and a N 2 O flow rate equal to or greater than about 1375 sccm.