Patent ID: 6890766

Claim:
A method for forming a transistor having a chemically undoped channel that provides an electronically induced p-channel or n-channel conduction based on a polarity of an applied gate voltage, the method comprising the steps of: forming a gate layer; depositing an insulating layer on the gate layer; forming a chemically undoped channel layer on the insulating layer by: epitaxially depositing a cuprate layer on the insulating layer in an oxygen environment to provide a substantially defect free cuprate layer, the cuprate layer comprising YBCO; and annealing the cuprate layer in a reducing environment and oxygen annealing the cuprate layer to adjust an oxygen content of the cuprate layer to provide a channel layer of YBa 2 Cu 3 O 7−δ where δ is between about 0 and about 1; and forming source and drain electrodes on the chemically undoped channel layer.