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Plasma processing apparatus

  • US 8,551,289 B2
  • Filed: 04/28/2010
  • Issued: 10/08/2013
  • Est. Priority Date: 04/28/2009
  • Status: Active Grant
First Claim
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1. A plasma processing apparatus for performing a plasma processing on a substrate to be processed by generating an inductively coupled plasma of a processing gas in a depressurized processing chamber, the plasma processing apparatus comprising:

  • a mounting table, provided in the processing chamber, for mounting thereon the substrate to be processed;

    a gas supply unit for introducing the processing gas into the processing chamber;

    a gas exhaust unit for depressurizing the inside of the processing chamber;

    a planar high frequency antenna disposed opposite to the susceptor with a plate-shaped dielectric member therebetween; and

    a shield member covering the high frequency antenna,wherein the high frequency antenna includes an inner antenna element provided at a central portion of a region above the plate-shaped dielectric member and an outer antenna element provided at an edge portion of the region above the plate-shaped dielectric member to surround a periphery of the inner antenna element,wherein two ends of each of the antenna elements are open ends and the antenna elements are grounded at central points thereof or points close thereto to resonate at ½

    wavelengths of high frequencies from individual high frequency power supplies,wherein the shield member includes;

    a cylindrical inner shield wall disposed between the antenna elements to surround the inner antenna element;

    a cylindrical outer shield wall disposed to surround the outer antenna element;

    an inner shield plate disposed above the inner antenna element to cover an opening of the inner shield wall; and

    an outer shield plate disposed above the outer antenna element to cover an opening between the inner and the outer shield wall, andwherein the shield plates are provided with shield height adjusting mechanisms for independently adjusting distances between the shield plates and the antenna elements, respectively.

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