Systems and methods for internal surface conditioning in plasma processing equipment
First Claim
1. A plasma processing system, comprising:
- a remote plasma generator configured to ionize first source gases; and
a processing chamber comprising;
a processing region to process a workpiece;
a plasma generation cavity remote and upstream from the processing region, the plasma generation cavity bounded by;
a first planar electrode configured to deliver the ionized first source gases and second plasma source gases into the plasma generation cavity through first perforations defined through the first planar electrode,a second planar electrode defining second perforations configured to deliver plasma products from the plasma generation cavity toward the processing region, anda ring shaped insulator that is disposed about and in contact with a periphery of the first electrode, and about and in contact with a periphery of the second electrode; and
a power supply configured to ignite a plasma of the ionized first source gases and the second plasma source gases in the plasma generation cavity, wherein the ring shaped insulator includes a port configured to receive an optical signal from the plasma, the port defining a radial aperture recessed to limit optical emissions to interactions with adjacent surfaces of the plasma generation cavity, the port disposed between the first perforations defined through the first planar electrode and the second perforations defined through the second planar electrode.
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Abstract
A method of conditioning internal surfaces of a plasma source includes flowing first source gases into a plasma generation cavity of the plasma source that is enclosed at least in part by the internal surfaces. Upon transmitting power into the plasma generation cavity, the first source gases ignite to form a first plasma, producing first plasma products, portions of which adhere to the internal surfaces. The method further includes flowing the first plasma products out of the plasma generation cavity toward a process chamber where a workpiece is processed by the first plasma products, flowing second source gases into the plasma generation cavity. Upon transmitting power into the plasma generation cavity, the second source gases ignite to form a second plasma, producing second plasma products that at least partially remove the portions of the first plasma products from the internal surfaces.
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Citations
15 Claims
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1. A plasma processing system, comprising:
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a remote plasma generator configured to ionize first source gases; and a processing chamber comprising; a processing region to process a workpiece; a plasma generation cavity remote and upstream from the processing region, the plasma generation cavity bounded by; a first planar electrode configured to deliver the ionized first source gases and second plasma source gases into the plasma generation cavity through first perforations defined through the first planar electrode, a second planar electrode defining second perforations configured to deliver plasma products from the plasma generation cavity toward the processing region, and a ring shaped insulator that is disposed about and in contact with a periphery of the first electrode, and about and in contact with a periphery of the second electrode; and a power supply configured to ignite a plasma of the ionized first source gases and the second plasma source gases in the plasma generation cavity, wherein the ring shaped insulator includes a port configured to receive an optical signal from the plasma, the port defining a radial aperture recessed to limit optical emissions to interactions with adjacent surfaces of the plasma generation cavity, the port disposed between the first perforations defined through the first planar electrode and the second perforations defined through the second planar electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A plasma processing system comprising:
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a processing chamber comprising a plurality of electrodes and one or more internal surfaces; a plasma generation cavity bounded at least in part by one or more internal surfaces and disposed upstream from placement of a workpiece, the plasma generation cavity bounded by; a first planar electrode defining first perforations and a first planar electrode internal surface, a second planar electrode defining second perforations configured to deliver plasma products from the plasma generation cavity toward a processing region, and having a second planar electrode internal surface, the second planar electrode internal surface facing the first planar electrode internal surface, to define the processing region there-between, and a ring shaped insulator that is disposed about and in contact with a periphery of the first planar electrode, and about and in contact with a periphery of the second planar electrode, and defines a ring shaped insulator internal surface; a power supply configured to apply power across the electrodes to ignite a plasma an optical window that is disposed adjacent the plasma generation cavity and is oriented such that captured optical emissions are not affected by interaction of the plasma with the workpiece, wherein the optical window is configured to capture optical emissions from the plasma; and
a computer configured to monitor one or more emission peaks of the captured optical emissions to assess the surface conditioning of the one or more internal surfaces,wherein the ring shaped insulator includes a radial aperture with which the optical window is coupled. - View Dependent Claims (12, 13, 14, 15)
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Specification