Patent ID: 8071434

Claim:
A method of fabricating a thin film transistor in which source and drain electrodes, a channel layer, a gate insulating layer, and a gate electrode are formed on a substrate, the method comprising the steps of: forming said channel layer comprised of an oxide semiconductor doped with boron in which the oxide semiconductor is formed of at least one metal oxide selected from the group consisting of ZnO, Inâ€”Znâ€”O, Znâ€”Snâ€”O, Inâ€”Gaâ€”ZnO, Znâ€”Inâ€”Snâ€”O, Inâ€”Gaâ€”O, and SnO 2 , and the boron is present in the oxide semiconductor in an amount ranging from 0.001 to 10 at % of total atomic weight of a metal atom of the metal oxide constituting the oxide semiconductor; and patterning the channel layer.