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Method and apparatus for an improved upper electrode plate in a plasma processing system

  • US 7,166,200 B2
  • Filed: 09/30/2002
  • Issued: 01/23/2007
  • Est. Priority Date: 09/30/2002
  • Status: Expired due to Term
First Claim
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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 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;

    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 Yttria; 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.

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