Patent ID: 6074903
Filing Date: 2000-06-13
Classification: H01L

Abstract:
A method for forming electrically isolated semiconductor devices in a silicon body, comprising:forming a trench in a selected region of the body;depositing a barrier material over sidewalls of the trench;removing portions of the barrier material from a first sidewall portion of the trench to expose such first sidewall portion of the trench while leaving portions of such barrier material on a second sidewall portion of the trench to form a barrier layer thereon;depositing a dielectric material in the trench, a portion of dielectric material being deposited on the exposed first sidewall portion of the trench and another portion of such deposited dielectric material being deposited on the barrier material;annealing the dielectric material in an oxidizing environment to densify such deposited dielectric material, the barrier layer inhibiting oxidation of the said second sidewall portion of the trench; andforming a plurality of the semiconductor devices in the silicon body with such devices being electrically isolated by the dielectric material in the trench.