Patent ID: 7972968

Claim:
A method of depositing a dielectric film into a gap between adjacent raised structures on a substrate disposed in a substrate processing chamber, the method comprising: depositing a first portion of the dielectric film within the gap by forming a high density plasma from a first gaseous mixture flown into the process chamber; thereafter, etching the deposited first portion of the dielectric film by flowing an etchant gas comprising C x F y , where a ratio of x to y is greater than or equal to 1:2; thereafter, depositing a second portion of the dielectric film over the first portion by forming a high density plasma from a second gaseous mixture flown into the process chamber; thereafter, etching the deposited second portion of the dielectric film by flowing a second etchant gas comprising C x F y , where a ratio of x to y is greater than or equal to 1:2; and thereafter, depositing a third portion of the dielectric film over the second portion by forming a high density plasma from a third gaseous mixture flown into the process chamber.