Patents by Inventor Shankar Chandran

Shankar Chandran 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: 7638161
    Abstract: A method and apparatus for controlling dopant concentration during borophosphosilicate glass film deposition on a semiconductor wafer to reduce consumption of nitride on the semiconductor wafer. In one embodiment of the invention, the method starts by placing a substrate having a nitride layer in a reaction chamber and providing a silicon source, an oxygen source and a boron source into the reaction chamber while delaying providing a phosphorous source into the reaction chamber to form a borosilicate glass layer over the nitride layer. The method continues by providing the silicon, oxygen, boron and phosphorous sources into the reaction chamber to form a borophosphosilicate film over the borosilicate glass layer.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: December 29, 2009
    Assignee: Applied Materials, Inc.
    Inventors: Kevin Mukai, Shankar Chandran
  • Publication number: 20050103266
    Abstract: A method and apparatus that reduces the time required to clean a processing chamber employing a reactive plasma cleaning process. A plasma is formed in an Astron fluorine source generator from a flow of substantially pure inert-source gas. After formation of the plasma, a flow of a fluorine source gas is introduced therein such that the fluorine source flow accelerates at a rate no greater than 1.67 standard cubic centimeters per second2 (scc/s2). In this fashion, the plasma contains a plurality of radicals and dissociated inert-source gas atoms, defining a cleaning mixture. The ratio of inert-source gas to fluorine source is greater than 1:1.
    Type: Application
    Filed: October 18, 2004
    Publication date: May 19, 2005
    Applicant: Applied Materials, Inc.
    Inventors: Shankar Chandran, Scott Hendrickson, Gwendolyn Jones, Shankar Venkataraman, Ellie Yieh
  • Publication number: 20030221621
    Abstract: A method and apparatus for processing semiconductor substrates by reacting hydroxyl radicals with a precursor to cause the precursor to decompose and form a film which deposits on a substrate. Hydroxyl radicals, which are produced in a hydroxyl-ion producing apparatus outside of a chemical vapor deposition reactor, are mixed with a precursor to form a hydroxyl ions-precursor mixture. The hydroxyl ions-precursor mixture is introduced into the chemical vapor deposition reactor.
    Type: Application
    Filed: June 2, 2003
    Publication date: December 4, 2003
    Applicant: Applied Materials Inc.
    Inventors: Himanshu Pokharna, Shankar Chandran, Srinivas D. Nemani, Chen-an Chen, Francimar Campana, Ellie Yieh, Li-Qun Xia
  • Patent number: 6596343
    Abstract: A method for processing semiconductor substrates by reacting hydroxyl radicals with a precursor to cause the precursor to decompose and form a film which deposits on a substrate. Hydroxyl radicals, which are produced in a hydroxyl-ion producing apparatus outside of a chemical vapor deposition reactor, are mixed with a precursor to form a hydroxyl ions-precursor mixture. The hydroxyl ions-precursor mixture is introduced into the chemical vapor deposition reactor.
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: July 22, 2003
    Assignee: Applied Materials, Inc.
    Inventors: Himanshu Pokharna, Shankar Chandran, Srinivas D. Nemani, Chen-an Chen, Francimar Campana, Ellie Yieh, Li-Qun Xia
  • Publication number: 20030111438
    Abstract: A method including in a wafer processing environment, introducing a liquid via a carrier gas, and separate from the liquid, introducing a first gas comprising ozone and a legacy amount of oxygen and a second gas comprising an effective amount of oxygen to modify a process operation. A system including a chamber, a liquid source, a first gas source, and a second gas source, a controller configured to control the introduction into the chamber of a liquid from the liquid source, a first gas comprising ozone and a legacy amount of oxygen from the first source, a second gas comprising oxygen from the second gas source, and a memory coupled to the controller comprising a machine-readable medium having a program embodied therein for controlling the second gas to introduce an effective amount of oxygen into the chamber to modify a process operation.
    Type: Application
    Filed: December 18, 2001
    Publication date: June 19, 2003
    Inventors: Kevin M. Mukai, Shankar Chandran
  • Patent number: 6514882
    Abstract: A method including over a substrate, forming an aggregate comprising a barrier layer between a first dielectric layer comprising nitrogen and a second dielectric layer comprising phosphorous, and after forming the aggregate, thermally treating the substrate. An apparatus including a substrate and an aggregate formed over the substrate including a barrier layer between a first dielectric layer comprising nitrogen and a second dielectric layer comprising phosphorous.
    Type: Grant
    Filed: February 19, 2001
    Date of Patent: February 4, 2003
    Assignee: Applied Materials, Inc.
    Inventors: Kevin M. Mukai, Shankar Chandran
  • Publication number: 20030017267
    Abstract: A method and apparatus for controlling dopant concentration during borophosphosilicate glass film deposition on a semiconductor wafer to reduce consumption of nitride on the semiconductor wafer. In one embodiment of the invention, the method starts by placing a substrate having a nitride layer in a reaction chamber and providing a silicon source, an oxygen source and a boron source into the reaction chamber while delaying providing a phosphorous source into the reaction chamber to form a borosilicate glass layer over the nitride layer. The method continues by providing the silicon, oxygen, boron and phosphorous sources into the reaction chamber to form a borophosphosilicate film over the borosilicate glass layer.
    Type: Application
    Filed: July 20, 2001
    Publication date: January 23, 2003
    Applicant: Applied Materials, Inc.
    Inventors: Kevin Mukai, Shankar Chandran
  • Publication number: 20020115302
    Abstract: A method including over a substrate, forming an aggregate comprising a barrier layer between a first dielectric layer comprising nitrogen and a second dielectric layer comprising phosphorous, and after forming the aggregate, thermally treating the substrate. An apparatus including a substrate and an aggregate formed over the substrate including a barrier layer between a first dielectric layer comprising nitrogen and a second dielectric layer comprising phosphorous.
    Type: Application
    Filed: February 19, 2001
    Publication date: August 22, 2002
    Inventors: Kevin M. Mukai, Shankar Chandran
  • Patent number: 6218268
    Abstract: A method for forming a BPSG film from a two-step deposition process and related apparatus and devices. A conformal layer of BPSG is deposited on a substrate. A more stable layer of BPSG is deposited at a higher deposition rate over the conformal layer. The method is suitable for filling trenches at least as narrow as 0.06 microns with aspect ratios of at least 5.5:1.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: April 17, 2001
    Assignee: Applied Materials, Inc.
    Inventors: Li-Qun Xia, Ellie Yieh, Maria Galiano, Francimar Campana, Shankar Chandran
  • Patent number: 6170492
    Abstract: The present invention provides a method and apparatus for detecting the end point of a process by monitoring the position of a valve during the process. In one aspect, a cleaning process is performed in the chamber, and a controller monitors the valve position to determine the end point of the process which corresponds to a decrease in the number of steps in the valve position required to achieve a stable throttle valve position after the cleaning process is complete.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: January 9, 2001
    Assignee: Applied Materials, Inc.
    Inventors: Hiroyuki Ueda, Hirotaka Tanabe, Makoto Okubo, Shankar Chandran, Ellie Yieh