Compositional optical emission spectroscopy for detection of particle induced arcs in a fabrication process
First Claim
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1. A method for detection of anomalous events in a plasma processing system, comprising:
- igniting a plasma in a plasma processing chamber;
detecting a non-spectrally resolved light emission signal and a spectrally-resolved light emission signal from the plasma in the plasma processing chamber, the non-spectrally resolved light emission signal and the spectrally-resolved light emission signal including light emissions from an anomalous event;
detecting a time of the anomalous event from the non-spectrally resolved light emission signal;
selecting a portion of the spectrally-resolved light emission signal in accordance with the time of the anomalous event detected from the non-spectrally resolved light emission signal;
processing the selected portion of the spectrally-resolved light emission signal; and
detecting a signature of the anomalous event from the processed spectrally-resolved light emission signal.
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Abstract
Described herein are architectures, platforms and methods for detecting and analyzing anomalous events (i.e., arcing events) from spectral data gathered during a wafer fabrication process.
79 Citations
20 Claims
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1. A method for detection of anomalous events in a plasma processing system, comprising:
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igniting a plasma in a plasma processing chamber; detecting a non-spectrally resolved light emission signal and a spectrally-resolved light emission signal from the plasma in the plasma processing chamber, the non-spectrally resolved light emission signal and the spectrally-resolved light emission signal including light emissions from an anomalous event; detecting a time of the anomalous event from the non-spectrally resolved light emission signal; selecting a portion of the spectrally-resolved light emission signal in accordance with the time of the anomalous event detected from the non-spectrally resolved light emission signal; processing the selected portion of the spectrally-resolved light emission signal; and detecting a signature of the anomalous event from the processed spectrally-resolved light emission signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for detection of anomalous events in a plasma processing system, comprising:
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a window disposed on a plasma processing chamber of the plasma processing system, for providing optical access to the plasma processing chamber; a detector for detecting a non-spectrally resolved light emission signal inside the plasma processing chamber; a spectrometer for detecting a spectrally-resolved light emission signal inside the plasma processing chamber, through the window; and a controller configured to detect a time of the anomalous event from the non-spectrally resolved light emission signal; select a portion of the spectrally-resolved light emission signal in accordance with the time of the anomalous event detected from the non-spectrally resolved light emission signal; and process and determine chemical species that caused the anomalous event from the selected portion of the spectrally-resolved light emission signal. - View Dependent Claims (18, 19, 20)
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Specification