Patents by Inventor DIMANTHA RAJAPAKSA

DIMANTHA RAJAPAKSA 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).

  • Publication number: 20230187215
    Abstract: Electrostatic chucks with reduced current leakage and methods of dicing semiconductor wafers are described. In an example, an etch apparatus includes a chamber, and a plasma source within or coupled to the chamber. An electrostatic chuck is within the chamber. The electrostatic chuck includes a conductive pedestal having a plurality of notches at a circumferential edge thereof. The electrostatic chuck also includes a plurality of lift pins corresponding to ones of the plurality of notches.
    Type: Application
    Filed: February 6, 2023
    Publication date: June 15, 2023
    Inventors: Sai Abhinand, Michael Sorensen, Karthik Elumalai, Dimantha Rajapaksa, Cheng Sun, James S. Papanu, Gaurav Mehta, Eng Sheng Peh, Sri Thirunavukarasu, Onkara Korasiddaramaiah
  • Patent number: 11600492
    Abstract: Electrostatic chucks with reduced current leakage and methods of dicing semiconductor wafers are described. In an example, an etch apparatus includes a chamber, and a plasma source within or coupled to the chamber. An electrostatic chuck is within the chamber. The electrostatic chuck includes a conductive pedestal having a plurality of notches at a circumferential edge thereof. The electrostatic chuck also includes a plurality of lift pins corresponding to ones of the plurality of notches.
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: March 7, 2023
    Assignee: Applied Materials, Inc.
    Inventors: Sai Abhinand, Michael Sorensen, Karthik Elumalai, Dimantha Rajapaksa, Cheng Sun, James S. Papanu, Gaurav Mehta, Eng Sheng Peh, Sri Thirunavukarasu, Onkara Korasiddaramaiah
  • Publication number: 20210175086
    Abstract: Electrostatic chucks with reduced current leakage and methods of dicing semiconductor wafers are described. In an example, an etch apparatus includes a chamber, and a plasma source within or coupled to the chamber. An electrostatic chuck is within the chamber. The electrostatic chuck includes a conductive pedestal having a plurality of notches at a circumferential edge thereof. The electrostatic chuck also includes a plurality of lift pins corresponding to ones of the plurality of notches.
    Type: Application
    Filed: December 10, 2019
    Publication date: June 10, 2021
    Inventors: Sai Abhinand, Michael Sorensen, Karthik Elumalai, Dimantha Rajapaksa, Cheng Sun, James S. Papanu, Gaurav Mehta, Eng Sheng Peh, Sri Thirunavukarasu, Onkara Korasiddaramaiah
  • Patent number: 10446423
    Abstract: Systems, apparatuses and methods for determining a surface profile of a substrate are provided. In one embodiment, a method includes projecting a signal having a vertical component/profile across the surface of the substrate from a plurality of locations along a first side of the substrate, capturing the projected signals at each of a plurality of respective locations across the surface of the substrate and determining a surface profile for the substrate using the captured signals. The process can be automated using a controller having predetermined projection and capture positions along respective sides of the substrate, where a surface profile of the substrate can be automatically determined by the controller using the captured signals.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: October 15, 2019
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Jun-Liang Su, Karthik Elumalai, Eng Sheng Peh, Sriskantharajah Thirunavukarasu, Dimantha Rajapaksa
  • Patent number: 10325790
    Abstract: Embodiments of methods and apparatus for correcting substrate deformity are provided herein. In some embodiments, a substrate support includes a base having an interior volume formed by walls extending upward from the base; a plurality of infrared lamps disposed within the interior volume; a support plate disposed above the plurality of infrared lamps, wherein the support plate includes a support surface to support a substrate; and a cover plate disposed atop the support plate and having a central opening corresponding to the support surface and an exhaust portion at a periphery of a top surface of the cover plate, wherein the exhaust portion includes a plurality of perforations fluidly coupling a space above the cover plate with an exhaust conduit formed in the cover plate. Embodiments of a showerhead assembly and processing equipment incorporating the inventive substrate support and showerhead assembly are additionally provided herein.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: June 18, 2019
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Eng Sheng Peh, Sriskantharajah Thirunavukarasu, Jun-Liang Su, Shoju Vayyapron, Karthik Elumalai, Dimantha Rajapaksa, Arunkumar M Tatti
  • Publication number: 20180218928
    Abstract: Embodiments of methods and apparatus for correcting substrate deformity are provided herein. In some embodiments, a substrate support includes a base having an interior volume formed by walls extending upward from the base; a plurality of infrared lamps disposed within the interior volume; a support plate disposed above the plurality of infrared lamps, wherein the support plate includes a support surface to support a substrate; and a cover plate disposed atop the support plate and having a central opening corresponding to the support surface and an exhaust portion at a periphery of a top surface of the cover plate, wherein the exhaust portion includes a plurality of perforations fluidly coupling a space above the cover plate with an exhaust conduit formed in the cover plate. Embodiments of a showerhead assembly and processing equipment incorporating the inventive substrate support and showerhead assembly are additionally provided herein.
    Type: Application
    Filed: November 13, 2017
    Publication date: August 2, 2018
    Inventors: Eng Sheng PEH, Sriskantharajah THIRUNAVUKARASU, Jun-Liang SU, Shoju VAYYAPRON, Karthik ELUMALAI, Dimantha RAJAPAKSA, Arunkumar M Tatti
  • Publication number: 20180144960
    Abstract: Systems, apparatuses and methods for determining a surface profile of a substrate are provided. In one embodiment, a method includes projecting a signal having a vertical component/profile across the surface of the substrate from a plurality of locations along a first side of the substrate, capturing the projected signals at each of a plurality of respective locations across the surface of the substrate and determining a surface profile for the substrate using the captured signals. The process can be automated using a controller having predetermined projection and capture positions along respective sides of the substrate, where a surface profile of the substrate can be automatically determined by the controller using the captured signals.
    Type: Application
    Filed: June 15, 2017
    Publication date: May 24, 2018
    Inventors: JUN-LIANG SU, KARTHIK ELUMALAI, ENG SHENG PEH, Sriskantharajah THIRUNAVUKARASU, DIMANTHA RAJAPAKSA