Patent ID: 6303519
Filing Date: 2001-10-16
Classification: C23C,H01L

Abstract:
A method of forming a fluorinated silicon oxide layer on a semiconductor wafer, the method comprising:providing a reacting chamber, the semiconductor wafer being placed into the reacting chamber;introducing a fluorine-rich gas and a silicon-rich gas into the reacting chamber;introducing an oxygen-rich gas into the reacting chamber and performing a first adjusting circulation including the steps of (1) adjusting the flow rate of the oxygen-rich gas and (2) verifying the ratio of the flow rate of the oxygen-rich gas to the fluorine-rich gas being less than or equal to 2;creating a plasma environment in the reacting chamber to deposit fluorinated silicon oxide on the semiconductor wafer;performing a second adjusting circulation for measuring and verifying the refraction index (RI) of the deposited fluorinated silicon oxide layer being greater than or equal to 1.46, if not, repeating the first adjusting circulation; andwhen the RI being greater than or equal to 1.46, performing a third adjusting circulation for adjusting the flow rate of the oxygen-rich gas till the oxygen to fluorine (O/F) ratio is less than or equal to a pre-selected value to form the deposited fluorinated silicon oxide layer, measuring and verifying the dielectric constant of the fluorinated silicon oxide layer is less than or equal to 3.