Patents by Inventor Visweswaren Sivaramakrishnan

Visweswaren Sivaramakrishnan 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: 20160222544
    Abstract: A system for depositing thin single crystal silicon wafers by epitaxial deposition in a silicon precursor depletion mode with cross-flow deposition may include: a substrate carrier with low total heat capacity, high emissivity and small volume; a lamp module with rapid heat-up, efficient heat production, and spatial control over heating; and a manifold designed for cross-flow processing. Furthermore, the substrate carrier may include heat reflectors to control heat loss from the edges of the carrier and/or heat chokes to thermally isolate the carrier from the manifolds, allowing independent temperature control of the manifolds. The carrier and substrates may be configured for deposition on both sides of the substrates—the substrates having release layers on both sides and the carriers being configured to have equal process gas flow over both surfaces of the substrate. High volume may be addressed by a deposition system comprising multiple mini-batch reactors.
    Type: Application
    Filed: February 3, 2016
    Publication date: August 4, 2016
    Inventors: Visweswaren Sivaramakrishnan, Tirunelveli S. Ravi, Andrzej Kaszuba (Deceased), Quoc Vinh Truong, Jean R. Vatus
  • Publication number: 20160145742
    Abstract: An apparatus and method are provided for controlling the intensity and distribution of a plasma discharge in a plasma chamber. In one embodiment, a shaped electrode is embedded in a substrate support to provide an electric field with radial and axial components inside the chamber. In another embodiment, the face plate electrode of the showerhead assembly is divided into zones by isolators, enabling different voltages to be applied to the different zones. Additionally, one or more electrodes may be embedded in the chamber side walls.
    Type: Application
    Filed: November 24, 2014
    Publication date: May 26, 2016
    Applicant: Applied Materials, Inc.
    Inventors: Karthik Janakiraman, Thomas NOWAK, Juan Carlos ROCHA-ALVAREZ, Mark FODOR, Dale R. DU BOIS, Amit Kumar BANSAL, Mohamad A. AYOUB, Eller Y. JUCO, Visweswaren SIVARAMAKRISHNAN, Hichem M'SAAD
  • Patent number: 9337072
    Abstract: The present invention generally provides methods and apparatus for monitoring and maintaining flatness of a substrate in a plasma reactor. Certain embodiments of the present invention provide a method for processing a substrate comprising positioning the substrate on an electrostatic chuck, applying an RF power between the an electrode in the electrostatic chuck and a counter electrode positioned parallel to the electrostatic chuck, applying a DC bias to the electrode in the electrostatic chuck to clamp the substrate on the electrostatic chuck, and measuring an imaginary impedance of the electrostatic chuck.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: May 10, 2016
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Ganesh Balasubramanian, Amit Bansal, Eller Y. Juco, Mohamad Ayoub, Hyung-Joon Kim, Karthik Janakiraman, Sudha Rathi, Deenesh Padhi, Martin Jay Seamons, Visweswaren Sivaramakrishnan, Bok Hoen Kim, Amir Al-Bayati, Derek R. Witty, Hichem M'Saad, Anton Baryshnikov, Chiu Chan, Shuang Liu
  • Publication number: 20160084400
    Abstract: A method and apparatus for cleaning a process chamber are provided. In one embodiment, a process chamber is provided that includes a remote plasma source and a process chamber having at least two processing regions. Each processing region includes a substrate support assembly disposed in the processing region, a gas distribution system configured to provide gas into the processing region above the substrate support assembly, and a gas passage configured to provide gas into the processing region below the substrate support assembly. A first gas conduit is configured to flow a cleaning agent from the remote plasma source through the gas distribution assembly in each processing region while a second gas conduit is configured to divert a portion of the cleaning agent from the first gas conduit to the gas passage of each processing region.
    Type: Application
    Filed: November 4, 2015
    Publication date: March 24, 2016
    Inventors: Ramprakash SANKARAKRISHNAN, Dale R. DU BOIS, Ganesh BALASUBRAMANIAN, Karthik JANAKIRAMAN, Juan Carlos ROCHA-ALVAREZ, Thomas NOWAK, Visweswaren SIVARAMAKRISHNAN, Hichem M'SAAD
  • Patent number: 9255346
    Abstract: A system for depositing thin single crystal silicon wafers by epitaxial deposition in a silicon precursor depletion mode with cross-flow deposition may include: a substrate carrier with low total heat capacity, high emissivity and small volume; a lamp module with rapid heat-up, efficient heat production, and spatial control over heating; and a manifold designed for cross-flow processing. Furthermore, the substrate carrier may include heat reflectors to control heat loss from the edges of the carrier and/or heat chokes to thermally isolate the carrier from the manifolds, allowing independent temperature control of the manifolds. The carrier and substrates may be configured for deposition on both sides of the substrates—the substrates having release layers on both sides and the carriers being configured to have equal process gas flow over both surfaces of the substrate. High volume may be addressed by a deposition system comprising multiple mini-batch reactors.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: February 9, 2016
    Assignee: Crystal Solar, Incorporated
    Inventors: Visweswaren Sivaramakrishnan, Tirunelveli S. Ravi, Andrzej Kaszuba, Bozena Kaszuba, Quoc Vinh Truong, Jean R. Vatus
  • Publication number: 20150361555
    Abstract: A CVD reactor for depositing material on substrates may comprise: a vacuum chamber; at least two substrate carriers arranged in parallel in a row within the vacuum chamber, each of the at least two substrate carriers comprising mounting positions for a plurality of substrates, the mounting positions being on the walls of channels configured for flowing process gases, the channels being in parallel planes within all of the at least two substrate carriers; a planar electrically resistive heater between every two adjacent substrate carriers in the row; and planar heaters at both ends of the row. Furthermore, CVD reactor chambers with three channel substrate carriers and/or gas preheat structure are described herein.
    Type: Application
    Filed: June 12, 2015
    Publication date: December 17, 2015
    Inventors: Visweswaren Sivaramakrishnan, Quoc Vinh Truong, Timothy N. Kleiner, Tirunelveli S. Ravi
  • Patent number: 9206511
    Abstract: A method and apparatus for cleaning a process chamber are provided. In one embodiment, a process chamber is provided that includes a remote plasma source and a process chamber having at least two processing regions. Each processing region includes a substrate support assembly disposed in the processing region, a gas distribution system configured to provide gas into the processing region above the substrate support assembly, and a gas passage configured to provide gas into the processing region below the substrate support assembly. A first gas conduit is configured to flow a cleaning agent from the remote plasma source through the gas distribution assembly in each processing region while a second gas conduit is configured to divert a portion of the cleaning agent from the first gas conduit to the gas passage of each processing region.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: December 8, 2015
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Ramprakash Sankarakrishnan, Dale R. Du Bois, Ganesh Balasubramanian, Karthik Janakiraman, Juan Carlos Rocha-Alvarez, Thomas Nowak, Visweswaren Sivaramakrishnan, Hichem M'Saad
  • Patent number: 8900399
    Abstract: An anodic etching system for simultaneously etching a multiplicity of substrates comprises: an etching tank for containing therein an etchant solution; a power supply connected between a first electrode and a second electrode, the first electrode and the second electrode being immersible in the etchant solution and positioned at opposite ends of the tank; and a plurality of support plates serially arranged between the first electrode and the second electrode and sealed to walls of the tank, wherein each of the plurality of support plates is configured to support at least one of the multiplicity of substrates, and wherein any consecutive pair of the plurality of support plates defines an isolated volume of the tank for containing a portion of the etchant solution. The plurality of support plates may be susceptors configured for holding the multiplicity of substrates in a chemical vapor deposition tool.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: December 2, 2014
    Assignee: Crystal Solar, Inc.
    Inventors: Tirunelveli S. Ravi, Ananda H. Kumar, Ashish Asthana, Kyle Ross Tantiwong, Visweswaren Sivaramakrishnan
  • Publication number: 20140318442
    Abstract: An epitaxial reactor enabling simultaneous deposition of thin films on a multiplicity of wafers is disclosed. During deposition, a number of wafers are contained within a wafer sleeve comprising a number of wafer carrier plates spaced closely apart. Process gases flow preferentially into the interior volume of the wafer sleeve, which is heated by one or more lamp modules. To improve uniformity, the direction of process gas flow may be varied in a cross-flow configuration and the wafers may be mounted at a small angle to the plane of the wafer carrier plates, wherein the wafers are configured in pairs along the direction of gas flow and wherein along the direction of gas flow the angular mounting of the wafers provides a smaller gap between opposed wafer surfaces on said parallel wafer carrier plates in the center of said wafer sleeve than at the periphery of said wafer sleeve.
    Type: Application
    Filed: March 17, 2014
    Publication date: October 30, 2014
    Applicant: Crystal Solar Incorporated
    Inventors: Visweswaren Sivaramakrishnan, Jean Vatus, Andrzej Kaszuba, Vicente Lim, Ashish Asthana
  • Publication number: 20140311403
    Abstract: An epitaxial reactor enabling simultaneous deposition of thin films on a multiplicity of wafers is disclosed. During deposition, a number of wafers are contained within a wafer sleeve comprising a number of wafer carrier plates spaced closely apart to minimize the process volume. Process gases flow preferentially into the interior volume of the wafer sleeve, which is heated by one or more lamp modules. Purge gases flow outside the wafer sleeve within a reactor chamber to minimize deposition on the chamber walls. Sequencing of the illumination of the individual lamps in the lamp module may further improve the linearity of variation in deposition rates within the wafer sleeve. To improve uniformity, the direction of process gas flow may be varied in a cross-flow configuration. Combining lamp sequencing with cross-flow processing in a multiple reactor system enables high throughput deposition with good film uniformities and efficient use of process gases.
    Type: Application
    Filed: March 17, 2014
    Publication date: October 23, 2014
    Applicant: Crystal Solar, Incorporated
    Inventors: Visweswaren Sivaramakrishnan, Kedarnath Sangam, Tirunelveli S. Ravi, Andrzej Kaszuba, Quoc Vinh Truong
  • Publication number: 20140295106
    Abstract: An epitaxial reactor enabling simultaneous deposition of thin films on a multiplicity of wafers is disclosed. During deposition, a number of wafers are contained within a wafer sleeve comprising a number of wafer carrier plates spaced closely apart to minimize the process volume. Process gases flow preferentially into the interior volume of the wafer sleeve, which is heated by one or more lamp modules. Purge gases flow outside the wafer sleeve within a reactor chamber to minimize wall deposition. In addition, sequencing of the illumination of the individual lamps in the lamp module may further improve the linearity of variation in deposition rates within the wafer sleeve. To improve uniformity, the direction of process gas flow may be varied in a cross-flow configuration. Combining lamp sequencing with cross-flow processing in a multiple reactor system enables high throughput deposition with good film uniformities and efficient use of process gases.
    Type: Application
    Filed: March 4, 2014
    Publication date: October 2, 2014
    Applicant: CRYSTAL SOLAR, INCORPORATED
    Inventors: Visweswaren Sivaramakrishnan, Kedarnath SANGAM, Tirunelveli S. RAVI, Andrzej KASZUBA, Quoc VINH
  • Publication number: 20140076236
    Abstract: A method and apparatus for cleaning a process chamber are provided. In one embodiment, a process chamber is provided that includes a remote plasma source and a process chamber having at least two processing regions. Each processing region includes a substrate support assembly disposed in the processing region, a gas distribution system configured to provide gas into the processing region above the substrate support assembly, and a gas passage configured to provide gas into the processing region below the substrate support assembly. A first gas conduit is configured to flow a cleaning agent from the remote plasma source through the gas distribution assembly in each processing region while a second gas conduit is configured to divert a portion of the cleaning agent from the first gas conduit to the gas passage of each processing region.
    Type: Application
    Filed: November 22, 2013
    Publication date: March 20, 2014
    Applicant: APPLIED MATERIALS, INC.
    Inventors: Ramprakash SANKARAKRISHNAN, Dale R. DU BOIS, Ganesh BALASUBRAMANIAN, Karthik JANAKIRAMAN, Juan Carlos ROCHA-ALVAREZ, Thomas NOWAK, Visweswaren SIVARAMAKRISHNAN, Hichem M'SAAD
  • Patent number: 8673081
    Abstract: An epitaxial reactor enabling simultaneous deposition of thin films on a multiplicity of wafers is disclosed. During deposition, a number of wafers are contained within a wafer sleeve comprising a number of wafer carrier plates spaced closely apart to minimize the process volume. Process gases flow preferentially into the interior volume of the wafer sleeve, which is heated by one or more lamp modules. Purge gases flow outside the wafer sleeve within a reactor chamber to minimize deposition on the walls of the chamber. In addition, sequencing of the illumination of the individual lamps in the lamp module may further improve the linearity of variation in deposition rates within the wafer sleeve. To improve uniformity, the direction of process gas flow may be varied in a cross-flow configuration. Combining lamp sequencing with cross-flow processing in a multiple reactor system enables high throughput deposition with good film uniformities and efficient use of process gases.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: March 18, 2014
    Assignee: Crystal Solar, Inc.
    Inventors: Visweswaren Sivaramakrishnan, Kedarnath Sangam, Tirunelveli S. Ravi, Andrzej Kaszuba, Quoc Vinh Truong
  • Patent number: 8663753
    Abstract: An epitaxial reactor enabling simultaneous deposition of thin films on a multiplicity of wafers is disclosed. During deposition, a number of wafers are contained within a wafer sleeve comprising a number of wafer carrier plates spaced closely apart to minimize the process volume. Process gases flow preferentially into the interior volume of the wafer sleeve, which is heated by one or more lamp modules. Purge gases flow outside the wafer sleeve within a reactor chamber to minimize wall deposition. In addition, sequencing of the illumination of the individual lamps in the lamp module may further improve the linearity of variation in deposition rates within the wafer sleeve. To improve uniformity, the direction of process gas flow may be varied in a cross-flow configuration. Combining lamp sequencing with cross-flow processing in a multiple reactor system enables high throughput deposition with good film uniformities and efficient use of process gases.
    Type: Grant
    Filed: October 30, 2012
    Date of Patent: March 4, 2014
    Assignee: Crystal Solar Incorporated
    Inventors: Visweswaren Sivaramakrishnan, Kedarnath Sangam, Tirunelveli S. Ravi, Andrzej Kaszuba, Quoc Vinh
  • Patent number: 8591699
    Abstract: A method and apparatus for cleaning a process chamber are provided. In one embodiment, a process chamber is provided that includes a remote plasma source and a process chamber having at least two processing regions. Each processing region includes a substrate support assembly disposed in the processing region, a gas distribution system configured to provide gas into the processing region above the substrate support assembly, and a gas passage configured to provide gas into the processing region below the substrate support assembly. A first gas conduit is configured to flow a cleaning agent from the remote plasma source through the gas distribution assembly in each processing region while a second gas conduit is configured to divert a portion of the cleaning agent from the first gas conduit to the gas passage of each processing region.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: November 26, 2013
    Assignee: Applied Materials, Inc.
    Inventors: Ramprakash Sankarakrishnan, Dale R. Du Bois, Ganesh Balasubramanian, Karthik Janakiraman, Juan Carlos Rocha-Alvarez, Thomas Nowak, Visweswaren Sivaramakrishnan, Hichem M'Saad
  • Publication number: 20130213574
    Abstract: A method and apparatus for cleaning a process chamber are provided. In one embodiment, a process chamber is provided that includes a remote plasma source and a process chamber having at least two processing regions. Each processing region includes a substrate support assembly disposed in the processing region, a gas distribution system configured to provide gas into the processing region above the substrate support assembly, and a gas passage configured to provide gas into the processing region below the substrate support assembly. A first gas conduit is configured to flow a cleaning agent from the remote plasma source through the gas distribution assembly in each processing region while a second gas conduit is configured to divert a portion of the cleaning agent from the first gas conduit to the gas passage of each processing region.
    Type: Application
    Filed: November 14, 2012
    Publication date: August 22, 2013
    Inventors: Ramprakash Sankarakrishnan, Dale R. Du Bois, Ganesh Balasubramanian, Karthik Janakiraman, Juan Carlos Rocha-Alvarez, Thomas Nowak, Visweswaren Sivaramakrishnan, Hichem M'Saad
  • Publication number: 20130032084
    Abstract: A system for depositing thin single crystal silicon wafers by epitaxial deposition in a silicon precursor depletion mode with cross-flow deposition may include: a substrate carrier with low total heat capacity, high emissivity and small volume; a lamp module with rapid heat-up, efficient heat production, and spatial control over heating; and a manifold designed for cross-flow processing. Furthermore, the substrate carrier may include heat reflectors to control heat loss from the edges of the carrier and/or heat chokes to thermally isolate the carrier from the manifolds, allowing independent temperature control of the manifolds. The carrier and substrates may be configured for deposition on both sides of the substrates—the substrates having release layers on both sides and the carriers being configured to have equal process gas flow over both surfaces of the substrate. High volume may be addressed by a deposition system comprising multiple mini-batch reactors.
    Type: Application
    Filed: May 29, 2012
    Publication date: February 7, 2013
    Applicant: Crytal Solar, Incorporated
    Inventors: Visweswaren Sivaramakrishnan, Tirunelveli S. Ravi, Quoc Vinh Truong, Jean R. Vatus, Visweswaren Sivaramakrishnan
  • Patent number: 8298629
    Abstract: An epitaxial reactor enabling simultaneous deposition of thin films on a multiplicity of wafers is disclosed. During deposition, a number of wafers are contained within a wafer sleeve comprising a number of wafer carrier plates spaced closely apart to minimize the process volume. Process gases flow preferentially into the interior volume of the wafer sleeve, which is heated by one or more lamp modules. Purge gases flow outside the wafer sleeve within a reactor chamber to minimize wall deposition. In addition, sequencing of the illumination of the individual lamps in the lamp module may further improve the linearity of variation in deposition rates within the wafer sleeve. To improve uniformity, the direction of process gas flow may be varied in a cross-flow configuration. Combining lamp sequencing with cross-flow processing in a multiple reactor system enables high throughput deposition with good film uniformities and efficient use of process gases.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: October 30, 2012
    Assignee: Crystal Solar Incorporated
    Inventors: Visweswaren Sivaramakrishnan, Kedarnath Sangam, Tirunelveli S. Ravi, Andrzej Kaszuba, Quoc Vinh Truong
  • Patent number: 8282734
    Abstract: An article having a protective coating for use in semiconductor applications and methods for making the same are provided. In certain embodiments, a method of coating an aluminum surface of an article utilized in a semiconductor processing chamber is provided. The method comprises providing a processing chamber; placing the article into the processing chamber; flowing a first gas comprising a carbon source into the processing chamber; flowing a second gas comprising a nitrogen source into the processing chamber; forming a plasma in the chamber; and depositing a coating material on the aluminum surface. In certain embodiments, the coating material comprises an amorphous carbon nitrogen containing layer. In certain embodiments, the article comprises a showerhead configured to deliver a gas to the processing chamber.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: October 9, 2012
    Assignee: Applied Materials, Inc.
    Inventors: Deenesh Padhi, Chiu Chan, Sudha Rathi, Ganesh Balasubramanian, Jianhua Zhou, Karthik Janakiraman, Martin J. Seamons, Visweswaren Sivaramakrishnan, Derek R. Witty, Hichem M'Saad
  • Publication number: 20120211164
    Abstract: Embodiments described herein relate to a substrate processing system that integrates substrate edge processing capabilities. Illustrated examples of the processing system include, without limitations, a factory interface, a loadlock chamber, a transfer chamber, and one or more twin process chambers having two or more processing regions that are isolatable from each other and share a common gas supply and a common exhaust pump. The processing regions in each twin process chamber include separate gas distribution assemblies and RF power sources to provide plasma at selective regions on a substrate surface in each processing region. Each twin process chamber is thereby configured to allow multiple, isolated processes to be performed concurrently on at least two substrates in the processing regions.
    Type: Application
    Filed: April 25, 2012
    Publication date: August 23, 2012
    Applicant: Applied Materials, Inc.
    Inventors: Ashish Shah, Dale R. DuBois, Ganesh Balasubramanian, Mark A. Fodor, Eui Kyoon Kim, Chiu Chan, Karthik Janakiraman, Thomas Nowak, Joseph C. Werner, Visweswaren Sivaramakrishnan, Mohamad Ayoub, Amir Al-Bayati, Jianhua Zhou