Patent ID: 8148722

Claim:
A thin film transistor (TFT) comprising: a gate electrode disposed on a substrate; a p-type ZnO semiconductor layer manufactured by the method comprising the steps of: preparing a substrate and loading the substrate into a chamber; injecting a Zn precursor and an oxygen precursor into the chamber, and causing a surface chemical reaction between the Zn precursor and the oxygen precursor using an atomic layer deposition (ALD) technique to form a ZnO thin layer on the substrate; and then, b1) injecting a Zn precursor on the substrate having the ZnO thin layer to adsorb the Zn precursor on the ZnO thin layer; b2) injecting an inert gas into the chamber to remove the remaining unadsorbed Zn precursor; b3) injecting an nitrogen precursor into the chamber, and causing a surface chemical reaction between the Zn precursor adsorbed on the ZnO thin layer to form a Zn 3 N 2 doping layer on the ZnO thin layer; b4) injecting an inert gas into the chamber to remove the remaining unreacted nitrogen precursor; and wherein the p-type ZnO semiconductor layer being disposed on or under the gate electrode; source and drain electrodes electrically connected to the p-type ZnO semiconductor layer; and a gate insulating layer interposed between the gate electrode and the p-type ZnO semiconductor layer.