Patent ID: 7312132
Filing Date: 2007-12-25
Classification: H01L

Abstract:
1. A method of fabricating a field insulator field effect transistor device, comprising: sequentially forming a gate oxide layer, a polycrystalline silicon layer and a nitride layer on a silicon on insulator substrate, the silicon on insulator substrate including a silicon layer, a buried oxide layer, and a silicon epitaxial layer; forming a mask pattern to pattern the nitride layer; forming a trench by patterning the polycrystalline silicon layer, the gate oxide layer, and the silicon epitaxial layer using the patterned nitride layer as a mask; performing a heat treatment to remove striations and facets formed on the etched side surface of the silicon epitaxial layer; and forming a field insulator in the trench, wherein the heat treatment is performed at a temperature of about 850° C. to about 1150° C. and in one of a hydrogen gas atmosphere and a heavy hydrogen gas atmosphere.