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PLASMA PROCESSING APPARATUS

  • US 20160177448A1
  • Filed: 12/14/2015
  • Published: 06/23/2016
  • Est. Priority Date: 12/18/2014
  • Status: Active Grant
First Claim
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1. A plasma processing apparatus that processes a substrate by generating plasma using a surface wave formed on a surface of a shower plate by a supplied microwave, the plasma processing apparatus including a plasma generating antenna which is equipped with the shower plate configured to supply a first gas and a second gas into a processing vessel, which comprising:

  • a drooping member made of a conductor and installed to protrude downward from a lower end surface of the shower plate,wherein an outer surface of the drooping member spreads outward as it goes from a top end to a bottom end thereof,wherein the shower plate includes a plurality of first gas supply holes through which the first gas is supplied into the processing vessel and a plurality of second gas supply holes through which the second gas is supplied into the processing vessel,wherein an upwardly-depressed concave portion is formed in a lower end surface of the drooping member,wherein a through-hole in communication with the concave portion from an upper end surface of the drooping member is formed inside the drooping member,wherein each of the first gas supply holes is disposed inward of the outer surface of the drooping member and is connected to the through-hole,wherein each of the second gas supply holes is disposed outward of the outer surface of the drooping member,wherein an orifice portion having a smaller sectional area than the through-hole is formed in the through-hole, andwherein a potential of the drooping member is a ground potential.

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