A MOSFET-structured Si tip for stable emission current

A current-controllable Si field emitter tip with a metal-oxide-semiconductor field-effect transistor (MOSFET) structure is proposed and demonstrated. The device has a simple structure in which a conical Si tip is made in the drain region of a MOSFET. The gate performs two roles; one is that of a conventional extraction gate and the other is that of a control gate for the drain current supplied to the tip. Experimental results showed that the emission current was well controlled and stabilized by the drain current Stable emission of about 0.8 /spl mu/A was obtained with a single tip. An extension to multi-gate MOSFET structure is also mentioned.