Patent ID: 8231799
Filing Date: 2012-07-31
Classification: H01J,H01L

Abstract:
1. A workpiece processing apparatus, comprising: a housing defining a process chamber; a workpiece support configured to support a workpiece within the chamber during processing and comprising a plasma bias power electrode; plural gas sources containing different gas species; plural process gas inlets; an array of valves, individual ones of said valves coupling individual ones of said plural gas sources to individual ones of said plural process gas inlets, individual ones of all of said inlets being separately coupled through respective ones said valves to all of said gas sources individually, whereby individual ones of said gas sources are separately coupled through individual ones of said valves to all of said inlets individually, and a controller governing said array of valves and controlling each of said valves individually and programmed to change the flow rates of individual gas species through said inlets individually over time and vary over time gas mixture in each said inlet independently of gas mixtures in others of said inlets; and a ceiling plasma source power electrode and comprising plural concentric gas injection zones coupled to respective ones of said plural process gas inlets; wherein each of said plural concentric gas injection zones comprises plural gas injection orifices co-planar with a surface of said ceiling and wherein a radially innermost one of said plural gas injection zones comprises a center circular gas disperser that is centered over said workpiece support and is one of (a) a single gas injection orifice, (b) a circular array of gas injection orifices, said plural gas injection zones further comprising plural gas injection zones surrounding said radially innermost one of said plural gas injection zones; wherein said plural gas sources comprise supplies containing, respectively, a fluorocarbon gas, a fluorohydrocarbon gas, one of pure oxygen or nitrogen gas, an inert gas.