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Topology induced plasma enhancement for etched uniformity improvement

  • US 5,472,565 A
  • Filed: 11/17/1993
  • Issued: 12/05/1995
  • Est. Priority Date: 11/17/1993
  • Status: Expired due to Term
First Claim
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1. An electrode useful in a plasma reaction chamber, comprising:

  • one or more outlets in a central portion of the electrode for discharging reactant gas outwardly of an exposed surface of the electrode; and

    a groove in the exposed surface, the groove being located at a peripheral portion of the electrode and extending at least partly around the central portion of the electrode, the groove being effective for topographically enhancing a local density of the plasma formed adjacent the exposed surface of the electrode.

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