Plasma monitoring and control method and system
First Claim
1. A method for monitoring the radio frequency power of a plasma in an electronic device fabrication reactor, comprising the steps of:
- sensing the voltage of the radio frequency power directed to a plasma-producing gas at the input to the plasma-producing environment of the electronic device fabrication reactor;
sensing the current of the radio frequency power directed to the plasma-producing gas at the input to the plasma-producing environment;
sensing the phase angle of the radio frequency power directed to the plasma-producing gas at the input to the plasma-producing environment; and
measuring the full-load impedance associated with the plasma-producing environment.
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Abstract
A plasma monitoring and control method and system monitor and control plasma in an electronic device fabrication reactor by sensing the voltage of the radio frequency power that is directed into the plasma producing gas at the input to the plasma producing environment of the electronic device fabrication reactor. The method and system further sense the current and phase angle of the radio frequency power directed to the plasma producing gas at the input to the plasma producing environment. Full load impedance is measured and used in determining characteristics of the plasma environment, including not only discharge and sheath impedances, but also chuck and wafer impedances, primary ground path impedance, and a secondary ground path impedance associated with the plasma environment. This permits end point detection of both deposition and etch processes, as well as advanced process control for electronic device fabrication. The invention also provides automatic gain control features for applying necessary signal gain control functions during the end point and advanced process control operations.
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Citations
14 Claims
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1. A method for monitoring the radio frequency power of a plasma in an electronic device fabrication reactor, comprising the steps of:
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sensing the voltage of the radio frequency power directed to a plasma-producing gas at the input to the plasma-producing environment of the electronic device fabrication reactor; sensing the current of the radio frequency power directed to the plasma-producing gas at the input to the plasma-producing environment; sensing the phase angle of the radio frequency power directed to the plasma-producing gas at the input to the plasma-producing environment; and measuring the full-load impedance associated with the plasma-producing environment. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for monitoring the radio frequency power of a plasma in an electronic device fabrication reactor during fabrication of an electronic device, comprising:
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voltage sensing circuitry for sensing the voltage of the radio frequency power directed to a plasma-producing gas at the input to the plasma-producing environment of the electronic device fabrication reactor; current sensing circuitry for sensing the current of the radio frequency power directed to the plasma-producing gas at the input to the plasma-producing environment; phase angle sensing circuitry for sensing the phase angle of the radio frequency power directed to the plasma-producing gas at the input to the plasma-producing environment; and impedance measuring circuitry for measuring the full-load impedance associated with the plasma-producing environment of the electronic device fabrication reactor. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification