Patents by Inventor Nety Krishna

Nety Krishna 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: 8693078
    Abstract: This invention contemplates integrating laser scribing/patterning the component layers of electrochromic devices by directly removing (ablating) the material of the component layers. To minimize redeposition of laser ablated material and particulate formation on device surfaces a number of approaches may be used: (1) ablated material generated by the focused laser patterning may be removed by vacuum suction and/or application of an inert gas jet in the vicinity of the laser ablation of device material; (2) spatial separation of the edges of layers and patterning of lower layers prior to deposition of upper layers; and (3) the laser patterning step may be performed by a laser beam focused directly on the deposited layers from above, by a laser beam directed through the transparent substrate, or by a combination of both.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: April 8, 2014
    Assignee: Applied Materials, Inc.
    Inventors: Byung Sung Kwak, Nety Krishna
  • Patent number: 8568571
    Abstract: A method of fabricating a layer of a thin film battery comprises providing a sputtering target and depositing the layer on a substrate using a physical vapor deposition process enhanced by a combination of plasma processes. The deposition process may include: (1) generation of a plasma between the target and the substrate; (2) sputtering the target; (3) supplying microwave energy to the plasma; and (4) applying radio frequency power to the substrate. A sputtering target for a thin film battery cathode layer has an average composition of LiMaNbZc, wherein 0.20>{b/(a+b)}>0 and the ratio of a to c is approximately equal to the stoichiometric ratio of a desired crystalline structure of the cathode layer, N is an alkaline earth element, M is selected from the group consisting of Co, Mn, Al, Ni and V, and Z is selected from the group consisting of (PO4), O, F and N.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: October 29, 2013
    Assignee: Applied Materials, Inc.
    Inventors: Byung Sung Kwak, Michael Stowell, Nety Krishna
  • Patent number: 8415556
    Abstract: Methods for fabrication of copper delafossite materials include a low temperature sol-gel process for synthesizing CuBO2 powders, and a pulsed laser deposition (PLD) process for forming thin films of CuBO2, using targets made of the CuBO2 powders. The CuBO2 thin films are optically transparent p-type semiconductor oxide thin films. Devices with CuBO2 thin films include p-type transparent thin film transistors (TTFT) comprising thin film CuBO2 as a channel layer and thin film solar cells with CuBO2 p-layers. Solid state dye sensitized solar cells (SS-DSSC) comprising CuBO2 in various forms, including “core-shell” and “nano-couple” particles, and methods of manufacture, are also described.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: April 9, 2013
    Assignee: Applied Materials, Inc.
    Inventors: Kaushal K. Singh, Omkaram Nalamasu, Nety Krishna, Michael Snure, Ashutosh Tiwari
  • Publication number: 20120218620
    Abstract: This invention contemplates integrating laser scribing/patterning the component layers of electrochromic devices by directly removing (ablating) the material of the component layers. To minimize redeposition of laser ablated material and particulate formation on device surfaces a number of approaches may be used: (1) ablated material generated by the focused laser patterning may be removed by vacuum suction and/or application of an inert gas jet in the vicinity of the laser ablation of device material; (2) spatial separation of the edges of layers and patterning of lower layers prior to deposition of upper layers; and (3) the laser patterning step may be performed by a laser beam focused directly on the deposited layers from above, by a laser beam directed through the transparent substrate, or by a combination of both.
    Type: Application
    Filed: May 1, 2012
    Publication date: August 30, 2012
    Applicant: Applied Materials, Inc.
    Inventors: Byung Sung Kwak, Nety Krishna
  • Patent number: 8168265
    Abstract: This invention contemplates the use of laser patterning/scribing in electrochromic device manufacture, anywhere during the manufacturing process as deemed appropriate and necessary for electrochromic device manufacturability, yield and functionality, while integrating the laser scribing so as to ensure the active layers of the device are protected to ensure long term reliability. It is envisaged that the laser is used to pattern the component layers of electrochromic devices by directly removing (ablating) the material of the component layers. The invention includes a manufacturing method for an electrochromic device comprising one or more focused laser patterning steps.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: May 1, 2012
    Assignee: Applied Materials, Inc.
    Inventors: Byung Sung Kwak, Nety Krishna
  • Patent number: 8057649
    Abstract: Disclosed is an invention that uses a coaxial microwave antenna as a primary plasma source in PVD. The coaxial microwave antenna is positioned inside a sputtering target. Instead of using a cathode assist in sputtering, microwaves generated from the coaxial microwave antenna may leak through the sputtering target that comprises a dielectric material to form microwave plasma outside the sputtering target. To further enhance plasma density, a magnetron or a plurality of magnetrons may be added inside the target to help confine secondary electrons. An electric potential may be formed between adjacent magnetrons and may further enhance ionization. To achieve directional control of the generated microwaves, a shield that comprises a dielectric material or dielectric material coated metal may be added proximate the coaxial microwave antenna. Furthermore, for high utilization of expensive target materials, a target can rotate to improve the utilization efficiency.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: November 15, 2011
    Assignee: Applied Materials, Inc.
    Inventors: Michael W. Stowell, Nety Krishna
  • Publication number: 20110114502
    Abstract: A method for reducing carbon dioxide to one or more products is disclosed. The method may include steps (A) to (C). Step (A) may bubble the carbon dioxide into a solution of an electrolyte and a catalyst in a divided electrochemical cell. The divided electrochemical cell may include an anode in a first cell compartment and a cathode in a second cell compartment. The cathode generally reduces the carbon dioxide into the products. Step (B) may vary at least one of (i) which of the products is produced and (ii) a faradaic yield of the products by adjusting one or more of (a) a cathode material and (b) a surface morphology of the cathode. Step (C) may separate the products from the solution.
    Type: Application
    Filed: July 29, 2010
    Publication date: May 19, 2011
    Inventors: Emily Barton Cole, Narayanappa Sivasankar, Andrew Bocarsly, Kyle Teamey, Nety Krishna
  • Publication number: 20090304912
    Abstract: This invention contemplates the use of laser patterning/scribing in electrochromic device manufacture, anywhere during the manufacturing process as deemed appropriate and necessary for electrochromic device manufacturability, yield and functionality, while integrating the laser scribing so as to ensure the active layers of the device are protected to ensure long term reliability. It is envisaged that the laser is used to pattern the component layers of electrochromic devices by directly removing (ablating) the material of the component layers. The invention includes a manufacturing method for an electrochromic device comprising one or more focused laser patterning steps.
    Type: Application
    Filed: June 6, 2008
    Publication date: December 10, 2009
    Inventors: BYUNG SUNG KWAK, Nety Krishna
  • Publication number: 20090288943
    Abstract: A method of fabricating a layer of a thin film battery comprises providing a sputtering target and depositing the layer on a substrate using a physical vapor deposition process enhanced by a combination of plasma processes. The deposition process may include: (1) generation of a plasma between the target and the substrate; (2) sputtering the target; (3) supplying microwave energy to the plasma; and (4) applying radio frequency power to the substrate. A sputtering target for a thin film battery cathode layer has an average composition of LiMaNbZc, wherein 0.20>{b/(a+b)}>0 and the ratio of a to c is approximately equal to the stoichiometric ratio of a desired crystalline structure of the cathode layer, N is an alkaline earth element, M is selected from the group consisting of Co, Mn, Al, Ni and V, and Z is selected from the group consisting of (PO4), O, F and N.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Inventors: Byung Sung Kwak, Michael Stowell, Nety Krishna
  • Publication number: 20090277778
    Abstract: Disclosed is an invention that uses a coaxial microwave antenna as a primary plasma source in PVD. The coaxial microwave antenna is positioned inside a sputtering target. Instead of using a cathode assist in sputtering, microwaves generated from the coaxial microwave antenna may leak through the sputtering target that comprises a dielectric material to form microwave plasma outside the sputtering target. To further enhance plasma density, a magnetron or a plurality of magnetrons may be added inside the target to help confine secondary electrons. An electric potential may be formed between adjacent magnetrons and may further enhance ionization. To achieve directional control of the generated microwaves, a shield that comprises a dielectric material or dielectric material coated metal may be added proximate the coaxial microwave antenna. Furthermore, for high utilization of expensive target materials, a target can rotate to improve the utilization efficiency.
    Type: Application
    Filed: May 6, 2008
    Publication date: November 12, 2009
    Applicant: Applied Materials, Inc.
    Inventors: MICHAEL W. STOWELL, Nety Krishna
  • Publication number: 20090238998
    Abstract: Disclosed are systems for achieving improved film properties by introducing additional processing parameters, such as a movable position for the microwave source and pulsing power to the microwave source, and extending the operational ranges and processing windows with the assistance of the microwave source. A coaxial microwave antenna is used for radiating microwaves to assist in physical vapor deposition (PVD) or chemical vapor deposition (CVD) systems. The system may use a coaxial microwave antenna inside a processing chamber, with the antenna being movable between a substrate and a plasma source, such as a sputtering target, a planar capacitively generated plasma source, or an inductively coupled source. In a special case when only a microwave plasma source is present, the position of the microwave antenna is movable relative to a substrate. The coaxial microwave antenna adjacent to the plasma source can assist the ionization more homogeneously and allow substantially uniform deposition over large areas.
    Type: Application
    Filed: March 18, 2008
    Publication date: September 24, 2009
    Applicant: Applied Materials, Inc.
    Inventors: MICHAEL W. STOWELL, Nety Krishna, Ralf Hofmann, Joe Griffith
  • Publication number: 20090238993
    Abstract: A source of IR radiation is used to heat a plastic substrate in a fast fashion inside a processing chamber, where the processing chamber is configured to preheat the plastic substrate and to perform thin film deposition, such as chemical vapor deposition (CVD) or physical vapor deposition (PVD), or plasma etching and cleaning. One aspect of using the source of IR radiation is to preheat only the surface of the plastic substrate while the core of the plastic substrate remains substantially unheated, so that the structure of the plastic substrate may remain unchanged. Meanwhile, the surface properties of the plastic substrate may be modified after the preheating treatment. The source of IR radiation may be provided at wavelength selected to substantially match the absorption wavelength of the plastic substrate. The plastic substrate moves through the heat flux zone generated by the source of IR radiation at a controllable speed.
    Type: Application
    Filed: March 19, 2008
    Publication date: September 24, 2009
    Applicant: Applied Materials, Inc.
    Inventors: Michael W. Stowell, Nety Krishna
  • Publication number: 20070243452
    Abstract: The present invention generally relates to the creation of fuel cell components and the method of forming the various fuel cell components that have an improved lifetime, lower production cost and improved process performance. The invention generally includes treating or conditioning a substrate surface by depositing a material layer, or layers, having good adhesion to the substrate, low electrical resistivity (high conductivity) and has good resistance to chemical attack during the operation of fuel cell. The substrate may be, for example, a fuel cell part, a conductive plate, a separator plate, a bipolar plate or an end plate, among others. In one embodiment, the substrate surface is treated or conditioned by exposing at least a portion of it to a gas or liquid comprising ruthenium tetroxide.
    Type: Application
    Filed: April 13, 2007
    Publication date: October 18, 2007
    Inventors: Timothy W. Weidman, Karl J. Armstrong, David J. Eaglesham, Nety Krishna, Ralf Hofmann, Michael P. Stewart
  • Publication number: 20060252252
    Abstract: In one embodiment, a method for depositing a material on a substrate is provided which includes positioning a substrate containing a contact within a process chamber, exposing the substrate to at least one pretreatment step and depositing a fill the contact vias by an electroless deposition process. The pretreatment step contains multiple processes for exposing the substrate to a wet-clean solution, a hydrogen fluoride solution, a tungstate solution, a palladium activation solution, an acidic rinse solution, a complexing agent solution or combinations thereof. Generally, the HARC via contains a tungsten oxide surface and the shallow contact via may contain a tungsten silicide surface. In some example, the substrate is pretreated such that both vias are filled at substantially the same time by a nickel-containing material through an electroless deposition process.
    Type: Application
    Filed: March 20, 2006
    Publication date: November 9, 2006
    Inventors: Zhize Zhu, Timothy Weidman, Michael Stewart, Arulkumar Shanmugasundram, Nety Krishna, Anthony Konecni
  • Patent number: 6190037
    Abstract: The present invention provides an apparatus and method for measuring the temperature of a moving radiant object. A probe, such as a pyrometer, is disposed in an opening of a vacuum chamber adjacent a radiation transparent window. The probe defines an optical path which intercepts the radiant object entering or exiting a processing chamber. The radiant object is moved through the optical path and emits electromagnetic waves. The electromagnetic waves are collected by the probe and transmitted to a signal processing unit where the waves are detected and converted to a temperature reading. If desired, the accumulated data may then be used to generate a cooling curve representing the thermal effects experienced by the radiant object. Extrapolation or correlation methods may be used to extend the cooling curve to points in time prior to or after the data collected by the probe.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: February 20, 2001
    Assignee: Applied Materials, Inc.
    Inventors: Ashok Das, Nety Krishna, Marc Schweitzer, Nalin Patadia, Wei Yang, Umesh Kelkar, Vijay Parkhe, Scot Petitt, Nitin Khurana