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Collar, conical showerheads and/or top plates for reducing recirculation in a substrate processing system

  • US 10,403,474 B2
  • Filed: 07/11/2016
  • Issued: 09/03/2019
  • Est. Priority Date: 07/11/2016
  • Status: Active Grant
First Claim
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1. A substrate processing system comprising:

  • a processing chamber;

    a showerhead including a faceplate, a stem portion and a cylindrical base portion;

    a collar connecting the showerhead to a top surface of the processing chamber,wherein the collar defines a gas channel to receive secondary purge gas and a plurality of gas slits to direct the secondary purge gas from the gas channel in a radially outward and downward direction; and

    a conical surface arranged adjacent to the cylindrical base portion and around the stem portion of the showerhead,wherein a top surface of the processing chamber includes an inverted conical surface arranged adjacent to the top surface and sidewalls of the processing chamber, wherein the inverted conical surface extends radially outward from (i) the top surface adjacent to the collar to (ii) the sidewalls, andwherein the conical surface and the inverted conical surface define an angled gas channel in a first gap between the conical surface and the inverted conical surface and extending radially outward from the collar to an outer edge of the cylindrical base portion and to the sidewalls of the processing chamber to define a second gap between a radially outer portion of the cylindrical base portion and the sidewalls of the processing chamber.

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