Computed tomography using intersecting views of plasma using optical emission spectroscopy during plasma processing
First Claim
1. A plasma optical emission spectrographic (OES) system comprising:
- a first array of multiple OES optical detectors configured to have a first line-of-sight view of plasma over a substrate on a substrate holder in an etch chamber of a plasma processing system;
a second array of multiple OES optical detectors configured to have a second line-of-sight view of plasma in the etch chamber; and
circuitry configured to generate a computed tomographic reconstruction of chemical species of the plasma based on measurements received from the first array of multiple OES optical detectors and the second array of multiple OES optical detectors,wherein, relative to each other, the first line-of-sight view and second line-of-sight view intersect within the etch chamber and are non-coextensive, non-parallel, and non-orthogonal,wherein the generation of the computed tomographic reconstruction includes;
obtaining light measurements from light received from intersecting views of the first and second line-of-sight views;
identifying chemical species in the plasma based on the obtained light measurements;
determining spatial locations of the identified chemical species in the plasma based on the obtained light measurements;
associating the determined spatial locations in the plasma for one or more of the identified chemical species;
storing a tomographic reconstruction based on the association of the determined spatial locations in the plasma with the respective one or more of the identified chemical species.
2 Assignments
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Accused Products
Abstract
Described herein are technologies to facilitate computed tomographic techniques to help identifying chemical species during plasma processing of a substrate (e.g., semiconductor wafer) using optical emission spectroscopy (OES). More particularly, the technology described herein uses topographic techniques to spatially resolves emissions and absorptions in at least two-dimension space above the substrate during the plasma processing (e.g., etching) of the substrate. With some implementations utilize optical detectors positioned along multiple axes (e.g., two or more) to receive incident incoming optical spectra from the plasma chamber during the plasma processing (e.g., etching) of the substrate. Because of the multi-axes arrangement, the incident incoming optical spectra form an intersecting grid.
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Citations
26 Claims
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1. A plasma optical emission spectrographic (OES) system comprising:
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a first array of multiple OES optical detectors configured to have a first line-of-sight view of plasma over a substrate on a substrate holder in an etch chamber of a plasma processing system; a second array of multiple OES optical detectors configured to have a second line-of-sight view of plasma in the etch chamber; and circuitry configured to generate a computed tomographic reconstruction of chemical species of the plasma based on measurements received from the first array of multiple OES optical detectors and the second array of multiple OES optical detectors, wherein, relative to each other, the first line-of-sight view and second line-of-sight view intersect within the etch chamber and are non-coextensive, non-parallel, and non-orthogonal, wherein the generation of the computed tomographic reconstruction includes; obtaining light measurements from light received from intersecting views of the first and second line-of-sight views; identifying chemical species in the plasma based on the obtained light measurements; determining spatial locations of the identified chemical species in the plasma based on the obtained light measurements; associating the determined spatial locations in the plasma for one or more of the identified chemical species; storing a tomographic reconstruction based on the association of the determined spatial locations in the plasma with the respective one or more of the identified chemical species. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 25, 26)
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13. A computed tomography system for a plasma optical emission spectrography (OES), the system comprising:
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a plasma OES subsystem that includes; one or more first OES optical detectors configured to have a first line-of-sight view of plasma over a substrate on a substrate holder in an etch chamber of a plasma processing system; one or more second OES optical detectors configured to have a second line-of-sight view of plasma in the etch chamber, wherein, relative to each other, the first line-of-sight view and second line-of-sight view intersect within the etch chamber; a computed tomographic reconstruction system configured to generate a computed tomographic reconstruction of chemical species of the plasma, wherein the generation of the computed tomographic reconstruction includes; obtaining light measurements from light received from intersecting views of the first and second line-of-sight views; identifying chemical species in the plasma based on the obtained light measurements; determining spatial locations of the identified chemical species in the plasma based on the obtained light measurements; associating the determined spatial locations in the plasma for one or more of the identified chemical species; and storing a tomographic reconstruction based on the association of the determined spatial locations in the plasma with the respective one or more of the identified chemical species. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method that facilitates computed tomographic reconstruction of plasma during plasma processing of a substrate in a plasma etch chamber of a plasma processing system, the method comprising:
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obtaining light measurements from a collection of optical detectors configured to receive incoming rays from plasma over a substrate on a substrate holder in an etch chamber of a plasma processing system, wherein the rays form an intersecting grid within the plasma; generating a computed tomographic reconstruction of chemical species of the plasma, wherein the generating includes; identifying chemical species in the plasma based on the obtained light measurements; determining spatial locations of the identified chemical species in the plasma based on the obtained light measurements; and associating the determined spatial locations in the plasma for one or more of the identified chemical species; and storing a tomographic reconstruction based on the association of the determined spatial locations in the plasma with the respective one or more of the identified chemical species.
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Specification