Patents by Inventor Laxmi WARAD

Laxmi WARAD 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: 12281893
    Abstract: A system to characterize a film layer within a measurement box is disclosed. The system obtains a first mixing fraction corresponding to a first X-ray beam, the mixing fraction represents a fraction of the first X-ray beam inside a measurement box of a wafer sample, the measurement box represents a bore structure disposed over a substrate and having a film layer disposed inside the bore structure. The system obtains a contribution value for the measurement box corresponding to the first X-ray beam, the contribution value representing a species signal outside the measurement box that contributes to a same species signal inside the measurement box. The system obtains a first measurement detection signal corresponding to a measurement of the measurement box using the first X-ray beam. The system determines a measurement value of the film layer based on the first measurement detection signal, the contribution value, and the first mixing fraction.
    Type: Grant
    Filed: May 17, 2024
    Date of Patent: April 22, 2025
    Assignee: NOVA MEASURING INSTRUMENTS INC.
    Inventors: Heath Pois, Wei Ti Lee, Laxmi Warad, Dmitry Kislitsyn, Parker Lund, Benny Tseng, James Chen, Saurabh Singh
  • Publication number: 20240401940
    Abstract: A system to characterize a film layer within a measurement box is disclosed. The system obtains a first mixing fraction corresponding to a first X-ray beam, the mixing fraction represents a fraction of the first X-ray beam inside a measurement box of a wafer sample, the measurement box represents a bore structure disposed over a substrate and having a film layer disposed inside the bore structure. The system obtains a contribution value for the measurement box corresponding to the first X-ray beam, the contribution value representing a species signal outside the measurement box that contributes to a same species signal inside the measurement box. The system obtains a first measurement detection signal corresponding to a measurement of the measurement box using the first X-ray beam. The system determines a measurement value of the film layer based on the first measurement detection signal, the contribution value, and the first mixing fraction.
    Type: Application
    Filed: May 17, 2024
    Publication date: December 5, 2024
    Applicant: NOVA MEASURING INSTRUMENTS INC.
    Inventors: Heath POIS, Wei Ti LEE, Laxmi WARAD, Dmitry Kislitsyn, Parker Lund, Benny Tseng, James CHEN, Saurabh Singh
  • Publication number: 20240167814
    Abstract: Quantification of the passivation and the selectivity in deposition process is disclosed. The passivation is evaluated by calculating film thicknesses on pattern lines and spaces. An XPS signal is used, which is normalized with X-ray flux number. The method is efficient for calculating thickness in selective deposition process, wherein the thickness can be used as metric to measure selectivity. Measured photoelectrons for each of the materials can be expressed as a function of the thickness of the material overlaying it, adjusted by material constant and effective attenuation length. In selective deposition over a patterned wafer, the three expressions can be solved to determine the thickness of the intended deposition and the thickness of any unintended deposition over passivated pattern.
    Type: Application
    Filed: December 22, 2023
    Publication date: May 23, 2024
    Inventors: Heath A. POIS, Laxmi WARAD, Srinivasan RANGARAJAN
  • Patent number: 11988502
    Abstract: A system to characterize a film layer within a measurement box is disclosed. The system obtains a first mixing fraction corresponding to a first X-ray beam, the mixing fraction represents a fraction of the first X-ray beam inside a measurement box of a wafer sample, the measurement box represents a bore structure disposed over a substrate and having a film layer disposed inside the bore structure. The system obtains a contribution value for the measurement box corresponding to the first X-ray beam, the contribution value representing a species signal outside the measurement box that contributes to a same species signal inside the measurement box. The system obtains a first measurement detection signal corresponding to a measurement of the measurement box using the first X-ray beam. The system determines a measurement value of the film layer based on the first measurement detection signal, the contribution value, and the first mixing fraction.
    Type: Grant
    Filed: October 24, 2022
    Date of Patent: May 21, 2024
    Assignee: NOVA MEASURING INSTRUMENTS INC.
    Inventors: Heath Pois, Wei Ti Lee, Laxmi Warad, Dmitry Kislitsyn, Parker Lund, Benny Tseng, James Chen, Saurabh Singh
  • Patent number: 11852467
    Abstract: Quantification of the passivation and the selectivity in deposition process is disclosed. The passivation is evaluated by calculating film thicknesses on pattern lines and spaces. An XPS signal is used, which is normalized with X-ray flux number. The method is efficient for calculating thickness in selective deposition process, wherein the thickness can be used as metric to measure selectivity. Measured photoelectrons for each of the materials can be expressed as a function of the thickness of the material overlaying it, adjusted by material constant and effective attenuation length. In selective deposition over a patterned wafer, the three expressions can be solved to determine the thickness of the intended deposition and the thickness of any unintended deposition over passivated pattern.
    Type: Grant
    Filed: March 12, 2020
    Date of Patent: December 26, 2023
    Assignee: NOVA MEASURING INSTRUMENTS, INC.
    Inventors: Heath A. Pois, Laxmi Warad, Srinivasan Rangarajan
  • Publication number: 20230288196
    Abstract: A system to characterize a film layer within a measurement box is disclosed. The system obtains a first mixing fraction corresponding to a first X-ray beam, the mixing fraction represents a fraction of the first X-ray beam inside a measurement box of a wafer sample, the measurement box represents a bore structure disposed over a substrate and having a film layer disposed inside the bore structure. The system obtains a contribution value for the measurement box corresponding to the first X-ray beam, the contribution value representing a species signal outside the measurement box that contributes to a same species signal inside the measurement box. The system obtains a first measurement detection signal corresponding to a measurement of the measurement box using the first X-ray beam. The system determines a measurement value of the film layer based on the first measurement detection signal, the contribution value, and the first mixing fraction.
    Type: Application
    Filed: October 24, 2022
    Publication date: September 14, 2023
    Applicant: NOVA MEASURING INSTRUMENTS INC.
    Inventors: Heath POIS, Wei Ti LEE, Laxmi WARAD, Dmitry Kislitsyn, Parker Lund, Benny Tseng, James CHEN, Saurabh Singh
  • Publication number: 20220155064
    Abstract: Quantification of the passivation and the selectivity in deposition process is disclosed. The passivation is evaluated by calculating film thicknesses on pattern lines and spaces. An XPS signal is used, which is normalized with X-ray flux number. The method is efficient for calculating thickness in selective deposition process, wherein the thickness can be used as metric to measure selectivity. Measured photoelectrons for each of the materials can be expressed as a function of the thickness of the material overlaying it, adjusted by material constant and effective attenuation length. In selective deposition over a patterned wafer, the three expressions can be solved to determine the thickness of the intended deposition and the thickness of any unintended deposition over passivated pattern.
    Type: Application
    Filed: March 12, 2020
    Publication date: May 19, 2022
    Inventors: Heath A. POIS, Laxmi WARAD, Srinivasan RANGARAJAN