Floating channel field effect transistor and a fabricating method thereof

Abstract

A field effect transistor is disclosed in which a source region and a drain region are formed to be reverse mesa on a semi- insulating semiconductor substrate with an insulating layer thereon by using a crystal growth characteristic corresponding to the crystal orientation. A channel layer and a gate electrode are formed by self- alignment on the upper part of a void formed according to the reverse mesa of the source and the drain regions, so that the channel layer and the semiconductor substrate are electrically separated by the void. By such a construction, a leakage current and backgating effect are removed, and a fast field effect transistor is attained owing to the reduction of an effective channel length and a gate resistance.