Patent ID: 7566368
Filing Date: 2009-07-28
Classification: H01J

Abstract:
1. An upper electrode for a plasma processing system comprising: an electrode plate comprising a first surface for coupling said electrode plate to an upper assembly, a second surface comprising a plasma surface configured to face a processing space in said plasma processing system and a mating surface positioned radially outward of the plasma surface and for mating said electrode plate with said plasma processing system, a peripheral edge, and one or more gas injection orifices coupled to said first surface and said second surface and configured to couple a processing gas to said processing space, wherein the plasma surface is axially recessed from the mating surface at least at an area adjacent to the mating surface; a protective barrier coupled to a plurality of exposed surfaces of said electrode plate, said exposed surfaces comprising said plasma surface and said protective barrier being a coating which comprises yttrium or dysprosium, or a combination thereof, wherein the protective barrier terminating on the plasma surface that is axially recessed from the mating surface; and a diagnostics port comprising an entrant cavity, and an exit through-hole, wherein said exit through-hole comprises an interior surface, wherein said exposed surfaces further comprise said interior surface of said diagnostics port.