Wide dynamic range ion energy bias control; fast ion energy switching; ion energy control and a pulsed bias supply; and a virtual front panel
First Claim
1. A method of operating a plasma processing chamber comprising:
- sustaining a plasma in contact with a substrate on a substrate support within the plasma processing chamber;
accessing an effective capacitance, C1, of the substrate support;
providing a modified periodic voltage function to the substrate support in order to effect a potential on a surface of the substrate, the modified periodic voltage function formed from a combination of a periodic voltage function and an ion current compensation, IC; and
calculating ion current, II, in the plasma as a function of measurements of the modified periodic voltage function.
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Abstract
This disclosure describes systems, methods, and apparatus for operating a plasma processing chamber. In particular, a periodic voltage function combined with an ion current compensation can be provided as a bias to a substrate support as a modified periodic voltage function. This in turn effects a DC bias on the surface of the substrate that controls an ion energy of ions incident on a surface of the substrate. A peak-to-peak voltage of the periodic voltage function can control the ion energy, while the ion current compensation can control a width of an ion energy distribution function of the ions. Measuring the modified periodic voltage function can provide a means to calculate an ion current in the plasma and a sheath capacitance of the plasma sheath. The ion energy distribution function can be tailored and multiple ion energy peaks can be generated, both via control of the modified periodic voltage function.
132 Citations
25 Claims
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1. A method of operating a plasma processing chamber comprising:
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sustaining a plasma in contact with a substrate on a substrate support within the plasma processing chamber; accessing an effective capacitance, C1, of the substrate support; providing a modified periodic voltage function to the substrate support in order to effect a potential on a surface of the substrate, the modified periodic voltage function formed from a combination of a periodic voltage function and an ion current compensation, IC; and calculating ion current, II, in the plasma as a function of measurements of the modified periodic voltage function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification