Surface treatment of an insulating film

摘要

This invention is directed to a method for the reform of an undercoating surface prior to the formation of a prospective film by the CVD technique using a reaction gas containing an ozone-containing gas having ozone contained in oxygen and TEOS. This method comprises the steps of forming an undercoating insulating film 5 on a substrate by the use of a mixed gas consisting of an ozone-containing gas having ozone contained in oxygen in a concentration of not less than 4% and a first silicon-containing gas, and reforming the surface of said undercoating insulating film 5 by exposing said surface to a second silicon-containing