Patents by Inventor Vijayakumar C. Venugopal

Vijayakumar C. Venugopal has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10607815
    Abstract: Methods of operating and assembling a plasma chamber are disclosed. An operating method includes tuning a match network of a plasma chamber while running a non-plasma discharge recipe. A hardware impedance of the plasma chamber is calculated from the match network settings from the tuning. A match loss for the plasma chamber is also calculated according to match network settings. A radio frequency (RF) power setting for the first plasma chamber is set according to the calculated hardware impedance and the calculated match loss. Such methods can be utilized to provide chamber-to-chamber performance matching across different plasma chambers. Certain disclosed methods of operating the plasma chamber can be utilized to identify hardware faults during operation and/or assembly processes.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: March 31, 2020
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Sathyendra Ghantasala, Hyun-Ho Doh, Vijayakumar C. Venugopal
  • Patent number: 10553397
    Abstract: A method of assigning faults to a processing chamber is described. Some embodiments include applying a radio frequency (RF) signal to a processing chamber to stimulate resonance in the chamber, measuring resonances of the applied RF signal in the chamber, extracting a fingerprint from the measured resonances, comparing the extracted fingerprint to a library of fingerprints, assigning a similarity index to combinations of the extracted fingerprint with at least one fingerprint in the fingerprint library, comparing each similarity index to a threshold, and if the similarity is greater than a threshold, then assigning a fault to the processing chamber using the library fingerprint.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: February 4, 2020
    Assignee: Applied Materials, Inc.
    Inventors: Sathyendra K. Ghantasala, Vijayakumar C. Venugopal, Hyun-Ho Doh
  • Publication number: 20200006039
    Abstract: Methods of operating and assembling a plasma chamber are disclosed. An operating method includes tuning a match network of a plasma chamber while running a non-plasma discharge recipe. A hardware impedance of the plasma chamber is calculated from the match network settings from the tuning. A match loss for the plasma chamber is also calculated according to match network settings. A radio frequency (RF) power setting for the first plasma chamber is set according to the calculated hardware impedance and the calculated match loss. Such methods can be utilized to provide chamber-to-chamber performance matching across different plasma chambers. Certain disclosed methods of operating the plasma chamber can be utilized to identify hardware faults during operation and/or assembly processes.
    Type: Application
    Filed: June 29, 2018
    Publication date: January 2, 2020
    Inventors: Sathyendra GHANTASALA, Hyun-Ho DOH, Vijayakumar C. VENUGOPAL
  • Publication number: 20190221401
    Abstract: A method of assigning faults to a processing chamber is described. Some embodiments include applying a radio frequency (RF) signal to a processing chamber to stimulate resonance in the chamber, measuring resonances of the applied RF signal in the chamber, extracting a fingerprint from the measured resonances, comparing the extracted fingerprint to a library of fingerprints, assigning a similarity index to combinations of the extracted fingerprint with at least one fingerprint in the fingerprint library, comparing each similarity index to a threshold, and if the similarity is greater than a threshold, then assigning a fault to the processing chamber using the library fingerprint.
    Type: Application
    Filed: March 26, 2019
    Publication date: July 18, 2019
    Inventors: Sathyendra K. Ghantasala, Vijayakumar C. Venugopal, Hyun-Ho Doh
  • Patent number: 10283320
    Abstract: A method of assigning faults to a processing chamber is described. Some embodiments include applying a radio frequency (RF) signal to a processing chamber to stimulate resonance in the chamber, measuring resonances of the applied RF signal in the chamber, extracting a fingerprint from the measured resonances, comparing the extracted fingerprint to a library of fingerprints, assigning a similarity index to combinations of the extracted fingerprint with at least one fingerprint in the fingerprint library, comparing each similarity index to a threshold, and if the similarity is greater than a threshold, then assigning a fault to the processing chamber using the library fingerprint.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: May 7, 2019
    Assignee: Applied Materials, Inc.
    Inventors: Sathyendra K. Ghantasala, Vijayakumar C. Venugopal, Hyun-Ho Doh
  • Publication number: 20180138015
    Abstract: A method of assigning faults to a processing chamber is described. Some embodiments include applying a radio frequency (RF) signal to a processing chamber to stimulate resonance in the chamber, measuring resonances of the applied RF signal in the chamber, extracting a fingerprint from the measured resonances, comparing the extracted fingerprint to a library of fingerprints, assigning a similarity index to combinations of the extracted fingerprint with at least one fingerprint in the fingerprint library, comparing each similarity index to a threshold, and if the similarity is greater than a threshold, then assigning a fault to the processing chamber using the library fingerprint.
    Type: Application
    Filed: November 11, 2016
    Publication date: May 17, 2018
    Inventors: Sathyendra K. Ghantasala, Vijayakumar C. Venugopal, Hyun-Ho Doh
  • Patent number: 9589769
    Abstract: A processing apparatus may include a plasma chamber to house a plasma; and an extraction assembly disposed along a side of the plasma chamber. The extraction assembly may be configured to direct ions from the plasma to a substrate, wherein the ions generate etched species comprising material that is etched from the substrate; and wherein the extraction assembly comprises at least one component having a recess that faces the substrate and is configured to intercept and retain the etched species.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: March 7, 2017
    Assignee: Varian Semiconductor Equipment Associates, Inc.
    Inventors: Vijayakumar C. Venugopal, Richard J. Hertel, Vikram Singh, Ernest E. Allen
  • Publication number: 20160013030
    Abstract: A processing apparatus may include a plasma chamber to house a plasma; and an extraction assembly disposed along a side of the plasma chamber. The extraction assembly may be configured to direct ions from the plasma to a substrate, wherein the ions generate etched species comprising material that is etched from the substrate; and wherein the extraction assembly comprises at least one component having a recess that faces the substrate and is configured to intercept and retain the etched species.
    Type: Application
    Filed: August 20, 2014
    Publication date: January 14, 2016
    Inventors: Vijayakumar C. Venugopal, Richard J. Hertel, Vikram Singh, Ernest E. Allen
  • Patent number: 8989888
    Abstract: A method for automatically detecting fault conditions and classifying the fault conditions during substrate processing is provided. The method includes collecting processing data by a set of sensors during the substrate processing. The method also includes sending the processing data to a fault detection/classification component. The method further includes performing data manipulation of the processing data by the fault detection/classification component. The method yet also includes executing a comparison between the processing data and a plurality of fault models stored within a fault library. Each fault model of the plurality of fault models represents a set of data characterizing a specific fault condition. Each fault model includes at least a fault signature, a fault boundary, and a set of principal component analysis (PCA) parameters.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: March 24, 2015
    Assignee: Lam Research Corporation
    Inventors: Gunsu Yun, Vijayakumar C. Venugopal
  • Patent number: 8983631
    Abstract: A process-level troubleshooting architecture (PLTA) configured to facilitate substrate processing in a plasma processing system is provided. The architecture includes a process module controller. The architecture also includes a plurality of sensors, wherein each sensor of the plurality of sensors communicates with the process module controller to collect sensed data about one or more process parameters. The architecture further includes a process-module-level analysis server, wherein the process-module-level analysis server communicates directly with the plurality of sensors and the process module controller. The process-module-level analysis server is configured for receiving data, wherein the data include at least one of the sensed data from the plurality of sensors and process module and chamber data from the process module controller.
    Type: Grant
    Filed: September 8, 2009
    Date of Patent: March 17, 2015
    Assignee: Lam Research Corporation
    Inventors: Chung Ho Huang, Vijayakumar C. Venugopal, Connie Lam, Dragan Podlesnik
  • Patent number: 8650002
    Abstract: A test system for facilitating determining whether a plasma processing system (which includes a plasma processing chamber) is ready for processing wafers. The test system may include a computer-readable medium storing at least a test program. The test program may include code for receiving electric parameter values derived from signals detected by at least one sensor when no plasma is present in the plasma processing chamber. The test program may also include code for generating electric model parameter values using the electric parameter values and a mathematical model. The test program may also include code for comparing the electric model parameter values with baseline model parameter value information. The test program may also include code for determining readiness of the plasma processing system based on the comparison. The test system may also include circuit hardware for performing one or more tasks associated with the test program.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: February 11, 2014
    Assignee: Lam Research Corporation
    Inventors: Brian Choi, Gunsu Yun, Vijayakumar C. Venugopal, Norman Williams
  • Patent number: 8618807
    Abstract: A method for detecting an in-situ fast transient event within a processing chamber during substrate processing is provided. The method includes a set of sensors comparing a data set to a set of criteria (in-situ fast transient events) to determine if the first data set includes a potential in-situ fast transient event. If the first data set includes the potential in-situ fast transient event, the method also includes saving an electrical signature that occurs in a time period during which the potential in-situ fast transient event occurs. The method further includes comparing the electrical signature against a set of stored arc signatures. If a match is determined, the method yet also includes classifying the electrical signature as a first in-situ fast transient event and determining a severity level for the first in-situ fast transient event based on a predefined set of threshold ranges.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: December 31, 2013
    Assignee: Lam Research Corporation
    Inventors: Luc Albarede, Vijayakumar C Venugopal
  • Patent number: 8538572
    Abstract: A method for automatically identifying an optimal endpoint algorithm for qualifying a process endpoint during substrate processing within a plasma processing system is provided. The method includes receiving sensor data from a plurality of sensors during substrate processing of at least one substrate within the plasma processing system, wherein the sensor data includes a plurality of signal streams from a plurality of sensor channels. The method also includes identifying an endpoint domain, wherein the endpoint domain is an approximate period within which the process endpoint is expected to occur. The method further includes analyzing the sensor data to generate a set of potential endpoint signatures. The method yet also includes converting the set of potential endpoint signatures into a set of optimal endpoint algorithms. The method yet further includes importing one optimal endpoint algorithm of the set of optimal endpoint algorithms into production environment.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: September 17, 2013
    Assignee: Lam Research Corporation
    Inventors: Jiangxin Wang, Andrew James Perry, Vijayakumar C Venugopal
  • Patent number: 8473089
    Abstract: A method for assessing health status of a processing chamber is provided. The method includes executing a recipe. The method also includes receiving processing data from a set of sensors during execution of the recipe. The method further includes analyzing the processing data utilizing a set of multi-variate predictive models. The method yet also includes generating a set of component wear data values. The method yet further includes comparing the set of component wear data values against a set of useful life threshold ranges. The method moreover includes generating a warning if the set of component wear data values is outside of the set of useful life threshold ranges.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: June 25, 2013
    Assignee: Lam Research Corporation
    Inventors: Luc Albarede, Eric Pape, Vijayakumar C Venugopal, Brian D Choi
  • Patent number: 8358416
    Abstract: A processing system having a chamber for in-situ optical interrogation of plasma emission to quantitatively measure normalized optical emission spectra is provided. The processing chamber includes a confinement ring assembly, a flash lamp, and a set of quartz windows. The processing chamber also includes a plurality of collimated optical assemblies, the plurality of collimated optical assemblies are optically coupled to the set of quartz windows. The processing chamber also includes a plurality of fiber optic bundles. The processing chamber also includes a multi-channel spectrometer, the multi-channel spectrometer is configured with at least a signal channel and a reference channel, the signal channel is optically coupled to at least the flash lamp, the set of quartz windows, the set of collimated optical assemblies, the illuminated fiber optic bundle, and the collection fiber optic bundle to measure a first signal.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: January 22, 2013
    Assignee: Lam Research Corporation
    Inventors: Vijayakumar C. Venugopal, Eric Pape, Jean-Paul Booth
  • Patent number: 8295966
    Abstract: A method for predicting etch rate uniformity for qualifying health status of a processing chamber during substrate processing of substrates is provided. The method includes executing a recipe and receiving processing data from a first set of sensors. The method further includes analyzing the processing data utilizing a subsystem health check predictive model to determine calculated data, which includes at least one of etch rate data and uniformity data. The subsystem health check predictive model is constructed by correlating measurement data from a set of film substrates with processing data collected during analogous processing of a set of non-film substrates. The method yet also includes performing a comparison of the calculated data against a set of control limits as defined by the subsystem health check predictive model. The method yet further includes generating a warning if the calculated data is outside of the set of control limits.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: October 23, 2012
    Assignee: Lam Research Corporation
    Inventors: Brian D Choi, Gunsu Yun, Vijayakumar C Venugopal
  • Patent number: 8271121
    Abstract: An arrangement for implementing an automatic in-situ process control scheme during execution of a recipe is provided. The arrangement includes control-loop sensors configured at least for collecting a first set of sensor data to facilitate monitoring set points during the recipe execution, wherein the control-loop sensors being part of a process control loop. The arrangement also includes independent sensors configured at least for collecting a second set of sensor data, which is not part of the process control loop. The arrangement yet also includes a hub configured for at least receiving at least one of the first set of sensor data and the second set of sensor data. The arrangement yet further includes an analysis computer communicably coupled with the hub and configured for performing analysis of at least one of the first set of sensor data and the second set of sensor data.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: September 18, 2012
    Assignee: Lam Research Corporation
    Inventors: Vijayakumar C. Venugopal, Neil Martin Paul Benjamin
  • Publication number: 20120170039
    Abstract: A processing system having a chamber for in-situ optical interrogation of plasma emission to quantitatively measure normalized optical emission spectra is provided. The processing chamber includes a confinement ring assembly, a flash lamp, and a set of quartz windows. The processing chamber also includes a plurality of collimated optical assemblies, the plurality of collimated optical assemblies are optically coupled to the set of quartz windows. The processing chamber also includes a plurality of fiber optic bundles. The processing chamber also includes a multi-channel spectrometer, the multi-channel spectrometer is configured with at least a signal channel and a reference channel, the signal channel is optically coupled to at least the flash lamp, the set of quartz windows, the set of collimated optical assemblies, the illuminated fiber optic bundle, and the collection fiber optic bundle to measure a first signal.
    Type: Application
    Filed: March 8, 2012
    Publication date: July 5, 2012
    Inventors: Vijayakumar C. Venugopal, Eric Pape, Jean-Paul Booth
  • Patent number: 8144328
    Abstract: An arrangement for in-situ optical interrogation of plasma emission to quantitatively measure normalized optical emission spectra in a plasma chamber is provided. The arrangement includes a flash lamp and a set of quartz windows. The arrangement also includes a plurality of collimated optical assemblies, which is optically coupled to the set of quartz windows. The arrangement further includes a plurality of fiber optic bundles, which comprises at least an illumination fiber optic bundle, a collection fiber optic bundle, and a reference fiber optic bundle. The arrangement more over includes a multi-channel spectrometer, which is configured with at least a signal channel and a reference channel. The signal channel is optically coupled to at least the flash lamp, the set of quartz windows, the set of collimated optical assemblies, the illuminated fiber optic bundle, and the collection fiber optic bundle to measure a first signal.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: March 27, 2012
    Assignee: Lam Research Corporation
    Inventors: Vijayakumar C. Venugopal, Eric Pape, Jean-Paul Booth
  • Patent number: 7907260
    Abstract: A method for optical interrogation of plasma during plasma processing in a plasma processing chamber is provided. The method includes providing an optical viewport. The method also includes providing a collimator arrangement. The collimator arrangement is configured with a plurality of collimators, wherein a first collimator of the plurality of collimators is separated by a connecting region from a second collimator in the plurality of collimators. The method further includes collecting optical signals, through the collimator arrangement, from the plasma within the plasma processing chamber while a substrate is being processed, resulting in highly collimated optical signals.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: March 15, 2011
    Assignee: Lam Research Corporation
    Inventors: Vijayakumar C. Venugopal, Eric A. Pape