Patent ID: 6905939
Filing Date: 2005-06-14
Classification: C23C,H01L

Abstract:
1. A method of forming a shallow trench isolation structure on a silicon substrate having a plurality of trenches etched therein to define isolation regions and a plurality of masked regions on an upper surface of said substrate positioned between said isolation regions, said method comprising: exposing the substrate to an oxidizing ambient to create a thermal oxide layer within the trench; forming a layer of silicon oxide over the thermal oxide layer by alternating (i) introducing to the chamber a first gas consisting of one of a silicon-containing precursor gas and an oxidant, (ii) purging the first gas from the chamber, (iii) introducing to the chamber a second gas consisting of the other of the silicon-containing precursor gas and the oxidant, (iv) purging the second gas from the chamber, and (v) repeating steps (i)-(iv) until a desired thickness of the silicon oxide layer is achieved; and filling the trenches with chemical vapor deposited silicon oxide material.