Patent ID: 8258511

Claim:
A thin film transistor, comprising: a gate dielectric layer disposed over a gate electrode and a substrate; an active channel coupled to the gate dielectric layer opposite the substrate, the active channel comprising: one or more gate control layers comprising oxygen, nitrogen, and one or more elements selected from the group consisting of zinc, indium, tin, cadmium and gallium and having a first composition, at least one of the one or more gate control layers is in contact with the gate dielectric layer; one or more bulk layers in contact with at least one of the one or more gate control layers, the one or more bulk layers comprising oxygen, nitrogen, and one or more elements selected from the group consisting of zinc, indium, tin, cadmium and gallium and having a second composition different than the first composition; and one or more back channel interface control layers in contact with at least one of the one or more bulk layers, the one or more back channel interface control layers comprising oxygen, nitrogen, and one or more elements selected from the group consisting of zinc, indium, tin, cadmium and gallium and having a third composition different than one or more of the first composition and the second composition; and source and drain electrodes coupled to at least one of the one or more back channel interface control layers.