Patent ID: 7967913

Claim:
A process for removing unwanted deposition build-up from one or more interior surfaces of a substrate processing chamber after processing a substrate disposed in the substrate processing chamber, the process comprising: transferring the substrate out of the substrate processing chamber; removing the unwanted deposition build-up by: (a) flowing a fluorine-containing etchant gas into a remote plasma source fluidly coupled to the substrate processing chamber, forming reactive species from the fluorine-containing etchant gas and transporting the reactive species into the substrate processing chamber; and (b) cycling pressure within the substrate processing chamber between a high pressure within a first range and a low pressure within a second range for at least two cycles of both high pressure and low pressure while continuously flowing the fluorine-containing etchant gas into the remote plasma source and continuously transporting the reactive species into the substrate processing chamber, wherein the high pressure is higher than the low pressure, a flow rate of the fluorine-containing etchant gas into the remote plasma source is 3000 sccms or more during the high pressure cycles and a duration of the low pressure cycles is between 4-8 seconds.