Patent ID: 6518190
Filing Date: 2003-02-11
Classification: H01J

Abstract:
A method of cleaning a plasma reactor and processing a wafer in the plasma reactor, the reactor having a ceiling supported on a side wall of said reactor and overlying a wafer support pedestal of the reactor, said method comprising:providing a processing coil antenna overlying only an annular portion of said ceiling; providing a cleaning coil antenna overlying at least an other portion of said ceiling outside of said annular portion; during wafer processing, setting a wafer on said wafer support pedestal so as to face said ceiling and applying plasma RF source power to said processing coil antenna while maintaining said cleaning antenna at a selected potential that is compatible with said processing coil antenna providing an adequately uniform plasma density distribution over said wafer, said plasma RF source power being sufficient for radiation from said processing coil antenna to cause an interior surface of said annular portion to remain free of contaminant deposition and being insufficient for said radiation to cause an interior surface of said other portion to remain free of contaminant deposition, whereby at least a part of the interior surface of said other portion of said ceiling accumulates contaminant deposition during said wafer processing; after wafer processing, removing said wafer from said wafer support pedestal, and removing said contaminant deposition from said other portion by applying RF cleaning power to said cleaning coil antenna, said RF cleaning power being sufficient for radiation from said cleaning antenna to cause removal of said contaminant deposition from the interior surface of said other portion of said ceiling.