Patent ID: 8267734

Claim:
A method for fabricating a field emission device, the field emission device being a gate controlled field emission triode, the method comprising the steps of: (1) providing a semiconductor substrate; (2) depositing a dielectric layer and a conductive layer on the semiconductor substrate; (3) defining a location of an emitter array on the dielectric layer and the conductive layer; (4) depositing an ultra thin ZnO film as a seeding layer on the semiconductor substrate; (5) employing a hydrothermal process to grow ZnO nanowires on the location of the emitter array on the semiconductor substrate; and (6) employing wet etching to remove other portions of the location which are not occupied by the emitter array; and (7) using Ar ions to bombard the ZnO nanowires to reduce a front radius of the nanowires, thereby improving field enhancement factor and field emission characteristic.