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Plasma processing method and resist pattern modifying method

  • US 8,394,720 B2
  • Filed: 09/03/2009
  • Issued: 03/12/2013
  • Est. Priority Date: 09/04/2008
  • Status: Active Grant
First Claim
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1. A plasma processing method for use with a plasma processing apparatus, which includes:

  • a processing chamber configured to accommodate a target substrate therein and capable of exhausting its inside to vacuum;

    a lower electrode arranged in the processing chamber and serving as a mounting table for the substrate;

    an upper electrode arranged in the processing chamber to face the lower electrode;

    a processing gas supply unit configured to supply a processing gas to the inside of the processing chamber;

    a high frequency power supply configured to supply a high frequency power to at least one of the upper electrode and the lower electrode to generate a plasma; and

    a DC power supply configured to supply a negative DC voltage to the upper electrode, the method comprising;

    modifying a resist pattern of the substrate; and

    trimming the modified resist pattern through a plasma etching,wherein said modifying includes;

    supplying the processing gas for modification from the processing gas supply unit to the inside of the processing chamber while the substrate having a surface on which the resist pattern is formed is mounted on the lower electrode;

    supplying the high frequency power from the high frequency power supply to generate a plasma of the processing gas for modification;

    supplying the negative DC voltage from the DC power supply to the upper electrode; and

    controlling the negative DC voltage to the upper electrode to control a depth the resist pattern is modified.

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