Method of plasma load impedance tuning for engineered transients by synchronized modulation of an unmatched low power RF generator
First Claim
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1. A method for processing a workpiece in a plasma reactor chamber, comprising:
- delivering through respective impedance match elements at least one of plural RF plasma powers into the chamber;
generating in a controller a time-varying modulation control signal corresponding to a desired process transient cycle;
modulating one of said plural RF plasma powers in accordance with said time-varying modulation control signal;
reducing reflected power at an RF generator furnishing said one or another one of said plural RF plasma powers, said reducing comprising;
(a) delivering stabilization RF power into said chamber; and
(b) modulating said stabilization RF power in response to said time-varying modulation control signal.
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Abstract
A method is provided in plasma processing of a workpiece for stabilizing the plasma against engineered transients in applied RF power, by modulating an unmatched low power RF generator in synchronism with the transient.
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Citations
19 Claims
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1. A method for processing a workpiece in a plasma reactor chamber, comprising:
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delivering through respective impedance match elements at least one of plural RF plasma powers into the chamber; generating in a controller a time-varying modulation control signal corresponding to a desired process transient cycle; modulating one of said plural RF plasma powers in accordance with said time-varying modulation control signal; reducing reflected power at an RF generator furnishing said one or another one of said plural RF plasma powers, said reducing comprising; (a) delivering stabilization RF power into said chamber; and (b) modulating said stabilization RF power in response to said time-varying modulation control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for processing a workpiece in a plasma reactor chamber, comprising:
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delivering plural RF plasma powers through respective plural impedance matches into said reactor chamber; generating in a controller a time-varying modulation control signal corresponding to a desired process transient cycle; modulating one or more of said RF plasma powers in accordance with said time-varying modulation control signal; reducing fluctuation in reflected power at an RF generator furnishing said one or another one of said RF plasma powers, said reducing comprising; (a) delivering plural stabilization RF powers of different respective RF frequencies into said chamber, and (b) modulating said plural stabilization RF powers in response to said time-varying modulation control signal. - View Dependent Claims (16, 17, 18, 19)
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Specification