Patent ID: 6277706
Filing Date: 2001-08-21
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the steps in sequence of:(a) forming on a substrate an isolation trench for isolating a plurality of semiconductor circuit elements;(b) forming a thermal oxide film on a sidewall of said isolation trench formed in said trench-forming step;(c) forming a silicon oxide film over the substrate to fill said isolation trench by chemical vapor deposition (CVD);(d) annealing the entire substrate at a temperature below 1200.degree. C., in an atmosphere devoid of water vapor, and at an elevated pressure sufficient to cause rearrangement of and densification of the silicon oxide film wherein said silicon oxide film is exposed when annealed; and(e) leveling the silicon oxide film by chemical and mechanical polishing (CMP) in such a manner that the silicon oxide film remains only in the trench.