Patent ID: 7332409

Claim:
A method of forming a trench isolation layer comprising: forming a first isolation layer in a trench using High Density Plasma Chemical Vapor Deposition (HDPCVD) with a carrier gas comprising hydrogen; forming a second isolation layer on the first isolation layer in the trench; heating the first and second isolation layers at a processing chamber temperature of about 50 degrees Centigrade to about 350 degrees Centigrade at least once at a processing chamber temperature of about 50 degrees Centigrade to about 350 degrees Centigrade in an oxidant and an inert gas environment or a vacuum in the processing chamber; and thermally annealing the first and second isolation layers at a processing chamber temperature of about 600 degrees Centigrade to about 1200 degrees Centigrade for a time of about 10 minutes to about 120 minutes in a oxygen, hydrogen, nitrogen, and/or water environment.