Patents by Inventor Supratik Guha

Supratik Guha 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: 10935514
    Abstract: Low power combustible gas sensors using a thermocouple design are provided. In one aspect, a combustible gas sensor includes: at least one first electrode; at least one second electrode formed from a dissimilar material from the first electrode; and a catalytic material at an active reaction junction between the first electrode and the second electrode, wherein the active reaction junction between the first electrode and the second electrode forms a thermocouple. A sensing device is including, e.g., multiple sensors, and a method for sensing combustible gas using the present sensors are also provided.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: March 2, 2021
    Assignee: International Business Machines Corporation
    Inventors: Josephine B. Chang, Talia S. Gershon, Supratik Guha, Hendrik F. Hamann, Jiaxing Liu, Theodore G. van Kessel
  • Publication number: 20200301270
    Abstract: The invention relates to a method used in a photolithographic process comprising depositing a film of Atomic layered Deposition (ALD) Al2O3 on a photomask, subjecting said film of Al2O3 on the photomask to a plasma treatment and then irradiating the deposited film of ALD Al2O3 on the coated photomask at a wavelength of 193 nm.
    Type: Application
    Filed: March 21, 2019
    Publication date: September 24, 2020
    Inventors: Robert L. Sandstrom, Peter H. Bartlau, Thomas B. Faure, Supratik Guha, Edward W. Kiewra, Louis M. Kindt, Alfred Wagner
  • Publication number: 20200249157
    Abstract: Systems and methods for performing refractometry include a primary waveguide, that has an injection end optically coupled to a laser and an output end optically coupled to a detector. A secondary waveguide has an interior, closed-loop optical path exhibiting total internal reflection, and an exterior surface having bound thereto a plurality of instances of a first binding entity type for an analyte. A portion of the exterior surface of the secondary waveguide is adjacent to the exterior surface of the primary waveguide, and a solution comprising a carrier fluid and an amplification complex includes a secondary particle bound to a second binding entity type for the analyte. The second binding entity type selected to bind to the analyte. The secondary particle is selected to have an index of refraction different from both the carrier fluid and the analyte.
    Type: Application
    Filed: February 1, 2019
    Publication date: August 6, 2020
    Inventors: Benjamin Diroll, Xufeng Zhang, Supratik Guha
  • Publication number: 20200103346
    Abstract: An optode has a planar radiation guiding medium having a first planar surface and a second planar surface and one or more perimeter surfaces bounded by the first and second planar surfaces. An excitation energy source of the optode is configured to output into the radiation guiding medium first energy at a wavelength selected to excite a fluorophore. The optode also includes a photodetector configured to image at least a portion of the first planar surface of the radiation guiding medium by detecting second energy transmitted through the radiation guiding medium.
    Type: Application
    Filed: September 28, 2018
    Publication date: April 2, 2020
    Inventors: Xufeng Zhang, Supratik Guha, Zoe G. Cardon
  • Patent number: 10573814
    Abstract: Vacuum annealing-based techniques for forming perovskite materials are provided. In one aspect, a method of forming a perovskite material is provided. The method includes the steps of: depositing a metal halide layer on a sample substrate; and vacuum annealing the metal halide layer and methylammonium halide under conditions sufficient to form methylammonium halide vapor which reacts with the metal halide layer and forms the perovskite material on the sample substrate. A perovskite-based photovoltaic device and method of formation thereof are also provided.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: February 25, 2020
    Assignee: International Business Machines Corporation
    Inventors: Talia S. Gershon, Supratik Guha, Oki Gunawan, Teodor K. Todorov
  • Publication number: 20190372001
    Abstract: Provided herein are resistive switching devices comprising a nanocomposite, an inert electrode and an active electrode. Also provided are methods for preparing and using the disclosed resistive switching devices.
    Type: Application
    Filed: May 31, 2018
    Publication date: December 5, 2019
    Inventors: Bhaswar Chakrabarti, Leonidas E. Ocola, Supratik Guha, Sushant Sonde
  • Patent number: 10483464
    Abstract: Provided herein are resistive switching devices comprising a nanocomposite, an inert electrode and an active electrode. Also provided are methods for preparing and using the disclosed resistive switching devices.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: November 19, 2019
    Assignees: UCHICAGO ARGONNE, LLC, THE UNIVERSITY OF CHICAGO
    Inventors: Bhaswar Chakrabarti, Leonidas E. Ocola, Supratik Guha, Sushant Sonde
  • Publication number: 20190323734
    Abstract: Techniques for hybrid solar thermal and photovoltaic energy collection are provided. In one aspect, a photovoltaic concentrating thermal collector (PVCTC) includes: a thermal absorber collector; and bent solar panels forming a parabolic shaped trough reflector partially surrounding the thermal absorber collector so as to reflect incident light onto the thermal absorber collector. A PVCTC system including an array of PVCTC units and a method for hybrid electrical and thermal energy production are also provided.
    Type: Application
    Filed: July 1, 2019
    Publication date: October 24, 2019
    Inventors: Supratik Guha, Siyuan Lu, Theodore G. van Kessel
  • Publication number: 20190249324
    Abstract: Techniques for mechanically stabilizing metallic nanowire meshes using encapsulation are provided. In one aspect, a method for forming a mechanically-stabilized metallic nanowire mesh is provided which includes the steps of: forming the metallic nanowire mesh on a substrate; and coating the metallic nanowire mesh with a metal oxide that encapsulates the metallic nanowire mesh to mechanically-stabilize the metallic nanowire mesh which permits the metallic nanowire mesh to remain conductive at temperatures greater than or equal to about 600° C. A mechanically-stabilized metallic nanowire mesh is also provided.
    Type: Application
    Filed: April 23, 2019
    Publication date: August 15, 2019
    Inventors: Talia S. Gershon, Supratik Guha, Teodor K. Todorov, Theodore G. van Kessel
  • Patent number: 10378792
    Abstract: Techniques for hybrid solar thermal and photovoltaic energy collection are provided. In one aspect, a photovoltaic concentrating thermal collector (PVCTC) includes: a thermal absorber collector; and bent solar panels forming a parabolic shaped trough reflector partially surrounding the thermal absorber collector so as to reflect incident light onto the thermal absorber collector. A PVCTC system including an array of PVCTC units and a method for hybrid electrical and thermal energy production are also provided.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: August 13, 2019
    Assignee: International Business Machines Corporation
    Inventors: Supratik Guha, Siyuan Lu, Theodore G. van Kessel
  • Publication number: 20190237667
    Abstract: Vacuum annealing-based techniques for forming perovskite materials are provided. In one aspect, a method of forming a perovskite material is provided. The method includes the steps of: depositing a metal halide layer on a sample substrate; and vacuum annealing the metal halide layer and methylammonium halide under conditions sufficient to form methylammonium halide vapor which reacts with the metal halide layer and forms the perovskite material on the sample substrate. A perovskite-based photovoltaic device and method of formation thereof are also provided.
    Type: Application
    Filed: April 8, 2019
    Publication date: August 1, 2019
    Inventors: Talia S. Gershon, Supratik Guha, Oki Gunawan, Teodor K. Todorov
  • Patent number: 10319871
    Abstract: Photovoltaic devices based on an Ag2ZnSn(S,Se)4 (AZTSSe) absorber and techniques for formation thereof are provided. In one aspect, a method for forming a photovoltaic device includes the steps of: coating a substrate with a conductive layer; contacting the substrate with an Ag source, a Zn source, a Sn source, and at least one of a S source and a Se source under conditions sufficient to form an absorber layer on the conductive layer having Ag, Zn, Sn, and at least one of S and Se; and annealing the absorber layer. Methods of doping the AZTSSe are provided. A photovoltaic device is also provided.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: June 11, 2019
    Assignee: International Business Machines Corporation
    Inventors: Talia S. Gershon, Supratik Guha, Oki Gunawan, Richard A. Haight, Yun Seog Lee
  • Patent number: 10309026
    Abstract: Techniques for mechanically stabilizing metallic nanowire meshes using encapsulation are provided. In one aspect, a method for forming a mechanically-stabilized metallic nanowire mesh is provided which includes the steps of: forming the metallic nanowire mesh on a substrate; and coating the metallic nanowire mesh with a metal oxide that encapsulates the metallic nanowire mesh to mechanically-stabilize the metallic nanowire mesh which permits the metallic nanowire mesh to remain conductive at temperatures greater than or equal to about 600° C. A mechanically-stabilized metallic nanowire mesh is also provided.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: June 4, 2019
    Assignee: International Business Machines Corporation
    Inventors: Talia S. Gershon, Supratik Guha, Teodor K. Todorov, Theodore G. van Kessel
  • Patent number: 10304979
    Abstract: A method and apparatus for manufacturing a nitrogen-doped CZTSSe layer for a solar cell is disclosed. A substrate is mounted in a vacuum chamber. A plurality of effusion cells are placed within the vacuum chamber in order to evaporate copper, zinc, tin, sulfur, and/or selenium to form elemental vapors in a region proximate the substrate. An RF-based nitrogen source delivers a nitrogen plasma in the region proximal to the substrate. The elemental vapors and the nitrogen plasma form a gas mixture in the region near the substrate, which then react at the substrate to form a CZTSSe absorber layer for a solar cell.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: May 28, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nestor A. Bojarczuk, Talia S. Gershon, Supratik Guha, Marinus Hopstaken, Byungha Shin
  • Patent number: 10297754
    Abstract: Vacuum annealing-based techniques for forming perovskite materials are provided. In one aspect, a method of forming a perovskite material is provided. The method includes the steps of: depositing a metal halide layer on a sample substrate; and vacuum annealing the metal halide layer and methylammonium halide under conditions sufficient to form methylammonium halide vapor which reacts with the metal halide layer and forms the perovskite material on the sample substrate. A perovskite-based photovoltaic device and method of formation thereof are also provided.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: May 21, 2019
    Assignee: International Business Machines Corporation
    Inventors: Talia S. Gershon, Supratik Guha, Oki Gunawan, Teodor K. Todorov
  • Patent number: 10290431
    Abstract: Monolithic tandem chalcopyrite-perovskite photovoltaic devices and techniques for formation thereof are provided. In one aspect, a tandem photovoltaic device is provided. The tandem photovoltaic device includes a substrate; a bottom solar cell on the substrate, the bottom solar cell having a first absorber layer that includes a chalcopyrite material; and a top solar cell monolithically integrated with the bottom solar cell, the top solar cell having a second absorber layer that includes a perovskite material. A monolithic tandem photovoltaic device and method of formation thereof are also provided.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: May 14, 2019
    Assignee: International Business Machines Corporation
    Inventors: Supratik Guha, Yun Seog Lee, Charles Sturdevant, Teodor K. Todorov
  • Publication number: 20190049403
    Abstract: Low power combustible gas sensors using a thermocouple design are provided. In one aspect, a combustible gas sensor includes: at least one first electrode; at least one second electrode formed from a dissimilar material from the first electrode; and a catalytic material at an active reaction junction between the first electrode and the second electrode, wherein the active reaction junction between the first electrode and the second electrode forms a thermocouple. A sensing device is including, e.g., multiple sensors, and a method for sensing combustible gas using the present sensors are also provided.
    Type: Application
    Filed: August 10, 2017
    Publication date: February 14, 2019
    Inventors: Josephine B. Chang, Talia S. Gershon, Supratik Guha, Hendrik F. Hamann, Jiaxing Liu, Theodore G. van Kessel
  • Publication number: 20190017166
    Abstract: The disclosure relates to a method for forming a low refractive index layer on a substrate. The method generally includes (a) applying a block copolymer layer on a substrate, the block copolymer including a polar polymeric block and a non-polar polymeric block; (b) swelling the block copolymer layer with a solvent to increase the block copolymer layer thickness; (c) depositing a metal oxide or metalloid oxide layer on polar polymeric blocks of the block copolymer layer; and (d) removing the block copolymer layer from the substrate, thereby forming a porous metal oxide or metalloid oxide layer on the substrate.
    Type: Application
    Filed: July 13, 2017
    Publication date: January 17, 2019
    Applicant: UCHICAGO ARGONNE, LLC
    Inventors: Elena Shevchenko, Diana Berman, Supratik Guha
  • Publication number: 20180315878
    Abstract: Photovoltaic devices based on an Ag2ZnSn(S,Se)4 (AZTSSe) absorber and techniques for formation thereof are provided. In one aspect, a method for forming a photovoltaic device includes the steps of: coating a substrate with a conductive layer; contacting the substrate with an Ag source, a Zn source, a Sn source, and at least one of a S source and a Se source under conditions sufficient to form an absorber layer on the conductive layer having Ag, Zn, Sn, and at least one of S and Se; and annealing the absorber layer. Methods of doping the AZTSSe are provided. A photovoltaic device is also provided.
    Type: Application
    Filed: July 5, 2018
    Publication date: November 1, 2018
    Inventors: Talia S. Gershon, Supratik Guha, Oki Gunawan, Richard A. Haight, Yun Seog Lee
  • Patent number: 10032949
    Abstract: Photovoltaic devices based on an Ag2ZnSn(S,Se)4 (AZTSSe) absorber and techniques for formation thereof are provided. In one aspect, a method for forming a photovoltaic device includes the steps of: coating a substrate with a conductive layer; contacting the substrate with an Ag source, a Zn source, a Sn source, and at least one of a S source and a Se source under conditions sufficient to form an absorber layer on the conductive layer having Ag, Zn, Sn, and at least one of S and Se; and annealing the absorber layer. Methods of doping the AZTSSe are provided. A photovoltaic device is also provided.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: July 24, 2018
    Assignee: International Business Machines Corporation
    Inventors: Talia S. Gershon, Supratik Guha, Oki Gunawan, Richard A. Haight, Yun Seog Lee