Patent ID: 6220201
Filing Date: 2001-04-24
Classification: H01J

Abstract:
A plasma reactor having a vacuum chamber with a cylindrical side portion of a first diameter and a ceiling at a certain height above a top of said cylindrical side portion, a wafer-holding pedestal adjacent a bottom of said vacuum chamber and generally displaced below a bottom of said side portion of said chamber by a height, gas injection ports adjacent said cylindrical side portion and a vacuum pump, said reactor comprising:a generally planar disk-shaped conductive ceiling electrode adjacent said ceiling;a coil antenna wound around a space between said conductive ceiling electrode and said wafer-holding pedestal;a switch for individually switching selected ones of said coil antenna, said ceiling electrode and said wafer-pedestal between at least two of (a) a respective RF power source, (b) ground, (c) a floating potential; anda bottom annular chamber wall having an outer edge lying generally below said cylindrical side portion of said chamber, said bottom annular chamber wall having a curved interior facing surface extending into said chamber from generally below said cylindrical side portion and terminating at an inner edge near said wafer pedestal.