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Electrostatic chuck having a plurality of heater coils

  • US 8,663,391 B2
  • Filed: 07/23/2012
  • Issued: 03/04/2014
  • Est. Priority Date: 04/27/2006
  • Status: Active Grant
First Claim
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1. An electrostatic chuck for receiving a substrate in a process chamber, the chuck comprising:

  • (a) a ceramic puck comprising (i) a substrate receiving surface having a plurality of raised plateaus defined by spaced apart mesas, the raised plateaus being distributed across the substrate receiving surface in a non-symmetrical pattern, (ii) an opposing backside surface, and (iii) central and peripheral portions;

    (b) a plurality of heat transfer gas conduits traversing the ceramic puck and terminating in ports on the substrate receiving surface to provide heat transfer gas to the substrate receiving surface;

    (c) an electrode embedded in the ceramic puck to generate an electrostatic force to retain a substrate placed on the substrate receiving surface; and

    (d) a plurality of heater coils embedded in the ceramic puck, the heater coils being radially spaced apart and concentric to one another.

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