Patent ID: 6500771
Filing Date: 2002-12-31
Classification: C23C,H01L

Abstract:
A method of forming a silicate glass film over a heated substrate by High Density Plasma Chemical Vapor Deposition (HDP-CVD) using a silicon source, a boron source, a phosphorus source, and an oxygen source as essential reactants in the constant presence of a plasma, the method comprising the steps of:a) placing a substrate in a reactor chamber wherein said substrate has at an upper surface a plurality of steps; b) in a first borosilicate glass deposition step, inducing a reaction in a gaseous mixture composition to produce deposition of a borosilicate glass film over said substrate, said borosilicate glass film is deposited by subjecting said substrate to a plasma during the entire said deposition step, and wherein said composition comprises said silicon source, said oxygen source, a carrier gas, a source of boron; c) in a second phosphosilicate glass deposition step, inducing a reaction in a gaseous mixture composition to produce deposition of a phosphosilicate glass film over said borosilicate film, said phosphosilicate glass film is deposited by subjecting said substrate to a plasma during the entire said deposition step, and wherein said composition comprises said silicon source, said oxygen source, a carrier gas, and a source of phosphorus; and d) in a post deposition thermal anneal of said borosilicate and phosphosilicate glass films, said borosilicate and phosphosilicate glass films are flowed wherein a worsening of film integrity and voids in said films between said steps are avoided.