Chamber matching using voltage control mode
First Claim
1. A method for compensating for harmonics produced during plasma processing in a plasma chamber, the method comprising:
- retrieving a measurement of a combined waveform, the combined waveform including a fundamental waveform and a harmonic waveform, the combined waveform defining a voltage proximate to a surface of a chuck, the chuck coupled to a radio frequency (RF) transmission line, the RF transmission line coupled to an impedance matching circuit, the impedance matching circuit coupled to an RF generator;
extracting the fundamental waveform from the combined waveform;
determining a difference between a magnitude of the combined waveform and a magnitude of the fundamental waveform; and
controlling the RF generator to compensate for the difference,wherein the method is executed by one or more processors.
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Accused Products
Abstract
Systems and methods for compensating for harmonics produced during plasma processing in a plasma chamber are described. One of the methods includes retrieving a measurement of a combined waveform. The combined waveform includes a fundamental waveform and a harmonic waveform. The combined waveform defines a voltage proximate to a surface of a chuck, which is coupled to a radio frequency (RF) transmission line. The RF transmission line is coupled to an impedance matching circuit. The impedance matching circuit is coupled to an RF generator. The method further includes extracting the fundamental waveform from the combined waveform, determining a difference between a magnitude of the combined waveform and a magnitude of the fundamental waveform, and controlling the RF generator to compensate for the difference.
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Citations
23 Claims
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1. A method for compensating for harmonics produced during plasma processing in a plasma chamber, the method comprising:
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retrieving a measurement of a combined waveform, the combined waveform including a fundamental waveform and a harmonic waveform, the combined waveform defining a voltage proximate to a surface of a chuck, the chuck coupled to a radio frequency (RF) transmission line, the RF transmission line coupled to an impedance matching circuit, the impedance matching circuit coupled to an RF generator; extracting the fundamental waveform from the combined waveform; determining a difference between a magnitude of the combined waveform and a magnitude of the fundamental waveform; and controlling the RF generator to compensate for the difference, wherein the method is executed by one or more processors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for compensating for harmonics produced during plasma processing in a plasma chamber, the method comprising:
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retrieving a measurement of a combined waveform, the combined waveform including a fundamental waveform and a harmonic waveform, the combined waveform defining a variable proximate to a surface of a chuck, the chuck coupled to a radio frequency (RF) transmission line, the RF transmission line coupled to an impedance matching circuit, the impedance matching circuit coupled to an RF generator; extracting the fundamental waveform from the combined waveform; determining a difference between a phase of the combined waveform and a phase of the fundamental waveform; and receiving an indication of a change to a plasma system, the change made to compensate for the difference, the plasma system including the RF transmission line, an RF cable coupling the impedance matching circuit to the RF generator, the impedance matching circuit, or a combination thereof, wherein the method is executed by one or more processors. - View Dependent Claims (14)
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15. A method for performing chamber-to-chamber matching, the method comprising:
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retrieving a measurement of a combined waveform, the combined waveform including a fundamental waveform and a harmonic waveform, the combined waveform defining a voltage proximate to a surface of a chuck, the chuck coupled to a radio frequency (RF) transmission line, the RF transmission line coupled to an impedance matching circuit, the impedance matching circuit coupled to an RF generator; extracting the fundamental waveform from the combined waveform; receiving an indication of coupling another chuck to the RF transmission line; retrieving a measurement of another combined waveform, the other combined waveform defining a voltage proximate to a surface of the other chuck; determining a difference between a magnitude of the other combined waveform and a magnitude of the fundamental waveform; and controlling the RF generator to compensate for the difference, wherein the method is executed by one or more processors. - View Dependent Claims (16)
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17. A method for performing chamber-to-chamber matching, the method comprising:
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retrieving a measurement of a combined waveform, the combined waveform including a fundamental waveform and a harmonic waveform, the combined waveform defining a voltage proximate to a surface of a chuck, the chuck coupled to a radio frequency (RF) transmission line, the RF transmission line coupled to an impedance matching circuit, the impedance matching circuit coupled to an RF generator; extracting the fundamental waveform from the combined waveform; receiving an indication of coupling another chuck to the RF transmission line; retrieving a measurement of another combined waveform, the other combined waveform defining a voltage proximate to a surface of the other chuck; determining a difference between a phase of the other combined waveform and a phase of the fundamental waveform; and receiving an indication of a change to a plasma system, the change made to compensate for the difference, the plasma system including the RF transmission line, an RF cable coupling the impedance matching circuit to the RF generator, the impedance matching circuit, the other chuck, or a combination thereof, wherein the method is executed by one or more processors. - View Dependent Claims (18)
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19. A method for performing intra-chamber matching, the method comprising:
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retrieving a measurement of a combined waveform, the combined waveform including a fundamental waveform and a harmonic waveform, the combined waveform defining a voltage proximate to a surface of a chuck of a plasma chamber in a first condition, the chuck coupled to a radio frequency (RF) transmission line, the RF transmission line coupled to an impedance matching circuit, the impedance matching circuit coupled to an RF generator; extracting the fundamental waveform from the combined waveform; receiving an indication of a change in the plasma chamber from the first condition to a second condition; retrieving a measurement of another combined waveform generated within the plasma chamber, the other combined waveform generated when the plasma chamber is in the second condition; determining a difference between a magnitude of the other combined waveform and a magnitude of the fundamental waveform; and controlling the RF generator to compensate for the difference, wherein the method is executed by one or more processors. - View Dependent Claims (20, 21)
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22. A method for performing intra-chamber matching, the method comprising:
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retrieving a measurement of a combined waveform, the combined waveform including a fundamental waveform and a harmonic waveform, the combined waveform defining a voltage proximate to a surface of a chuck of a plasma chamber in a first condition, the chuck coupled to a radio frequency (RF) transmission line, the RF transmission line coupled to an impedance matching circuit, the impedance matching circuit coupled to an RF generator; extracting the fundamental waveform from the combined waveform; receiving an indication of a change the plasma chamber from the first condition to a second condition; retrieving a measurement of another combined waveform, the other combined waveform generated when the plasma chamber is in the second condition; determining a difference between a phase of the other combined waveform and a phase of the fundamental waveform; and receiving an indication of a change to a plasma system, the change made to compensate for the difference, the plasma system including the RF transmission line, an RF cable coupling the impedance matching circuit to the RF generator, the impedance matching circuit, the chuck, or a combination thereof, wherein the method is executed by one or more processors. - View Dependent Claims (23)
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Specification