Patent ID: 7037855

Claim:
A method of forming a fluorine-doped silicon oxide film nearly or substantially free of hydrogen, using capacitive-coupled plasma CVD, comprising: introducing a processing gas comprising SiH 4 as a silicon source gas, SiF 4 as a fluorine source gas, and CO 2 as an oxygen source gas to a reaction chamber at a flow ratio of (SiH 4 +SiF 4 )/CO 2 in the range of about 0.02 to about 0.2 and at a total pressure of about 250 Pa to about 350 Pa; and applying first RF power at a frequency of about 10 MHz to about 30 MHz and second RF power at a frequency of about 400 kHz to about 500 kHz with lower intensity than that of the first RF power by overlaying the two RF powers to generate a plasma reaction field within the reaction chamber, thereby depositing on a substrate a fluorine-doped silicon oxide film nearly or substantially free of hydrogen.