Method of controlling chamber parameters of a plasma reactor in accordance with desired values of plural plasma parameters, by translating desired values for the plural plasma parameters to control values for each of the chamber parameters
First Claim
1. A method of controlling plural chamber parameters of a plasma reactor in accordance with desired values of plural plasma parameters, said chamber parameters comprising bias power and source power, said plural plasma parameters being selected from a group comprising etch rate, wafer voltage, ion energy, and wafer current, said method comprising:
- concurrently translating desired values for said plural plasma parameters to control values for each of plural chamber parameters; and
setting each of said chamber parameters to corresponding ones of said control values.
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Abstract
Plural chamber parameters of a plasma reactor are controlled in accordance with desired values of plural plasma parameters, by concurrently translating desired values for the plural plasma parameters to control values for each of plural chamber parameters, and then setting each of the chamber parameters to corresponding ones of the control values. The translating consists of the following steps: (a) for each one of the chamber parameters, ramping the level of the one chamber parameter while sampling RF electrical parameters at an RF bias power input to the wafer support pedestal and computing from each sample of the RF electrical parameters the values of plural plasma parameters, and storing the values with the corresponding levels of the one chamber parameter as corresponding chamber parameter data; (b) for each one of the chamber parameters, deducing, from the corresponding chamber parameter data, a single variable function for each of the plural plasma parameters having the one chamber parameter as an independent variable; (c) from combinations of the functions, constructing surfaces defining simultaneous values of all of the chamber parameters, each respective surface corresponding to a respective constant value of one of the plural plasma parameters, and storing the surfaces.
108 Citations
16 Claims
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1. A method of controlling plural chamber parameters of a plasma reactor in accordance with desired values of plural plasma parameters, said chamber parameters comprising bias power and source power, said plural plasma parameters being selected from a group comprising etch rate, wafer voltage, ion energy, and wafer current, said method comprising:
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concurrently translating desired values for said plural plasma parameters to control values for each of plural chamber parameters; and
setting each of said chamber parameters to corresponding ones of said control values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification