Patent ID: 7234476

Claim:
A method of cleaning a CVD processing chamber equipped with upper and lower parallel flat plate electrodes after processing a wafer, using a remote plasma-discharge device, comprising: selecting as the upper and lower electrodes a lower electrode having a surface area which is 1.08 to 1.38 times that of the wafer, and an upper electrode having a surface area which is 1.05 to 1.44 times that of the lower electrode; supplying a mixed gas of F 2 gas and an inert gas as a cleaning gas to the remote plasma-discharge device, wherein the mixed gas contains the F 2 gas at a concentration of 20% or higher; activating the cleaning gas inside the remote plasma-discharge device; and bringing the activated cleaning gas into the processing chamber while controlling the upper electrode at a temperature of 200° C. to 400° C.