Patent ID: 7431967

Claim:
A method of filling a gap defined by adjacent raised features on a substrate, comprising: providing a flow of a silicon-containing processing gas to a chamber housing the substrate; providing a flow of an oxidizing processing gas to the chamber; providing a flow of a phosphorous-containing processing gas to the chamber; depositing a first portion of a P-doped silicon oxide film as a substantially conformal layer in the gap by causing a reaction between the silicon-containing processing gas, the phosphorous-containing processing gas, and the oxidizing processing gas, wherein depositing the conformal layer comprises varying between a beginning and end of the depositing of the conformal layer, and throughout the depositing of the conformal layer a ratio of the (silicon-containing processing gas plus phosphorous-containing processing gas):(oxidizing processing gas) and maintaining the temperature of the substrate below about 500° C. throughout deposition of the conformal layer; and thereafter, depositing a second portion of the P-doped silicon oxide film as a bulk layer, wherein depositing a second portion of the film comprises maintaining the ratio of the (silicon-containing processing gas plus phosphorous-containing processing gas):(oxidizing processing gas) substantially constant throughout deposition of the bulk layer and maintaining the temperature of the substrate below about 500° C. throughout deposition of the bulk layer.