Patents by Inventor Timothy A. Gessert

Timothy A. Gessert 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: 10651323
    Abstract: Disclosed embodiments include CdS/CdTe PV devices (100) having a back contact (110,112) with oxygen gettering capacity. Also disclosed are back contact structures (110, 112) and methods of forming a back contact in a CdS/CdTe PV device (100). The described contacts and methods feature a contact having a contact interface layer (100) comprising a contact interface material, a p-type dopant and a gettering metal.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: May 12, 2020
    Assignee: Alliance for Sustainable Energy, LLC
    Inventor: Timothy A. Gessert
  • Publication number: 20180358487
    Abstract: Disclosed embodiments include CdS/CdTe PV devices (100) having a back contact (110,112) with oxygen gettering capacity. Also disclosed are back contact structures (110, 112) and methods of forming a back contact in a CdS/CdTe PV device (100). The described contacts and methods feature a contact having a contact interface layer (100) comprising a contact interface material, a p-type dopant and a gettering metal.
    Type: Application
    Filed: August 21, 2018
    Publication date: December 13, 2018
    Inventor: Timothy A. Gessert
  • Patent number: 9722111
    Abstract: In one embodiment, a method for surface passivation for CdTe devices is provided. The method includes adjusting a stoichiometry of a surface of a CdTe material layer such that the surface becomes at least one of stoichiometric or Cd-rich; and reconstructing a crystalline lattice at the surface of the CdTe material layer by annealing the adjusted surface.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: August 1, 2017
    Assignee: Alliance for Sustainable Energy, LLC
    Inventors: Matthew O. Reese, Craig L. Perkins, James M. Burst, Timothy A. Gessert, Teresa M. Barnes, Wyatt K. Metzger
  • Patent number: 9147793
    Abstract: A method of producing polycrystalline CdTe materials and devices that incorporate the polycrystalline CdTe materials are provided. In particular, a method of producing polycrystalline p-doped CdTe thin films for use in CdTe solar cells in which the CdTe thin films possess enhanced acceptor densities and minority carrier lifetimes, resulting in enhanced efficiency of the solar cells containing the CdTe material are provided.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: September 29, 2015
    Assignee: Alliance For Sustainable Energy, LLC
    Inventors: Timothy A. Gessert, Rommel Noufi, Ramesh G. Dhere, David S. Albin, Teresa Barnes, James Burst, Joel N. Duenow, Matthew Reese
  • Publication number: 20150270423
    Abstract: Disclosed embodiments include CdS/CdTe PV devices (100) having a back contact (110,112) with oxygen gettering capacity. Also disclosed are back contact structures (110, 112) and methods of forming a back contact in a CdS/CdTe PV device (100). The described contacts and methods feature a contact having a contact interface layer (100) comprising a contact interface material, a p-type dopant and a gettering metal.
    Type: Application
    Filed: May 30, 2013
    Publication date: September 24, 2015
    Inventor: Timothy A. Gessert
  • Publication number: 20150221812
    Abstract: In one embodiment, a method for surface passivation for CdTe devices is provided. The method includes adjusting a stoichiometry of a surface of a CdTe material layer such that the surface becomes at least one of stoichiometric or Cd-rich; and reconstructing a crystalline lattice at the surface of the CdTe material layer by annealing the adjusted surface.
    Type: Application
    Filed: February 5, 2015
    Publication date: August 6, 2015
    Inventors: Matthew O. REESE, Craig L. PERKINS, James M. BURST, Timothy A. GESSERT, Teresa M. BARNES, Wyatt K. METZGER
  • Publication number: 20150144186
    Abstract: Embodiments disclosed herein include photovoltaic absorber materials (302) and photovoltaic devices (300) having absorber materials (302) with intentionally increased permittivity. Alternative embodiments include methods (200) of producing thin film photovoltaic absorbers (302) from materials having increased permittivity or methods of producing devices having absorbers (302) with increased permittivity. In selected embodiments, the permittivity of an absorber material (302) is increased by incorporating a permittivity increasing material therein.
    Type: Application
    Filed: May 16, 2013
    Publication date: May 28, 2015
    Inventor: Timothy A. Gessert
  • Patent number: 8747630
    Abstract: Transparent conducting oxides and production thereof are disclosed. An exemplary method of producing a transparent conducting oxide (TCO) material may comprise: providing a TCO target doped with either a high-permittivity oxide or a low-permittivity oxide in a process chamber. The method may also comprise depositing a metal oxide on the target in the process chamber to form a thin film having enhanced optical properties without substantially decreasing electrical quality.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: June 10, 2014
    Assignee: Alliance for Sustainable Energy, LLC
    Inventors: Timothy A. Gessert, Yuki Yoshida, Timothy J. Coutts
  • Patent number: 8734621
    Abstract: Transparent conducting oxides and production thereof are disclosed. An exemplary method of producing a transparent conducting oxide (TCO) material may comprise: providing a TCO target (110) doped with either a high-permittivity oxide or a low-permittivity oxide in a process chamber (100). The method may also comprise depositing a metal oxide on the target (110) to form a thin film having enhanced optical properties without substantially decreasing electrical quality.
    Type: Grant
    Filed: January 16, 2007
    Date of Patent: May 27, 2014
    Assignee: Alliance for Sustainable Energy, LLC
    Inventors: Timothy A. Gessert, Yuki Yoshida, Timothy J. Coutts
  • Publication number: 20140134786
    Abstract: A method of producing polycrystalline CdTe materials and devices that incorporate the polycrystalline CdTe materials are provided. In particular, a method of producing polycrystalline p-doped CdTe thin films for use in CdTe solar cells in which the CdTe thin films possess enhanced acceptor densities and minority carrier lifetimes, resulting in enhanced efficiency of the solar cells containing the CdTe material are provided.
    Type: Application
    Filed: June 20, 2012
    Publication date: May 15, 2014
    Applicant: Alliance for Sustainable Energy, LLC
    Inventors: Timothy A. Gessert, Rommel Noufi, Ramesh G. Dhere, David S. Albin, Teresa Barnes, James Burst, Joel N. Duenow, Matthew Reese
  • Publication number: 20130327398
    Abstract: Improved thin-film photovoltaic devices and methods of manufacturing such devices are described. Embodiments include a substrate-configured thin-film PV device (200) having a photo-absorbing semiconductor layer (230) and a window layer (240). Embodiments include devices having a CdTe photo-absorbing semiconductor layer, a CdS or CdS:In window layer, and an n-p junction residing at or proximate an interface of the photo-absorbing semiconductor and window layers. Variations include methods of manufacture wherein i) O2 is excluded from an ambient environment during deposition of the CdTe layer (102), ii) O2 is included in an ambient environment during CdCl2 treatment (103), iii) O2 is included in an ambient environment during deposition of a CdS or CdS:In layer (104), or iv) a medium-temperature anneal (MTA) having an anneal temperature of 300° C. or less is performed (105) after deposition of the CdS layer.
    Type: Application
    Filed: February 27, 2012
    Publication date: December 12, 2013
    Applicant: ALLIANCE FOR SUSTAINABLE ENERGY, LLC
    Inventors: Ramesh Dhere, Joel Duenow, Timothy A. Gessert
  • Patent number: 8568828
    Abstract: A tin-cadmium oxide film having an amorphous structure and a ratio of tin atoms to cadmium atoms of between 1:1 and 3:1. The tin-cadmium oxide film may have an optical band gap of between 2.7 eV and 3.35 eV. The film may also have a charge carrier concentration of between 1×1020 cm?3 and 2×1020 cm?3. The tin cadmium oxide film may also exhibit a Hall mobility of between 40 cm2V?1 s?1 and 60 cm2V?1 s?1. Also disclosed is a method of producing an amorphous tin-cadmium oxide film as described and devices using same.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: October 29, 2013
    Assignee: Alliance for Sustainable Energy, LLC
    Inventors: Xiaonan Li, Timothy A. Gessert
  • Patent number: 8253012
    Abstract: A transparent conducting oxide (TCO) film comprising: a TCO layer, and dopants selected from the elements consisting of Vanadium, Molybdenum, Tantalum, Niobium, Antimony, Titanium, Zirconium, and Hafnium, wherein the elements are n-type dopants; and wherein the transparent conducting oxide is characterized by an improved electron mobility of about 42 cm2/V-sec while simultaneously maintaining a high carrier density of ˜4.4e×1020 cm?3.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: August 28, 2012
    Assignee: Alliance for Sustainable Energy, LLC
    Inventors: Timothy A. Gessert, Joel N. Duenow, Teresa Barnes, Timothy J. Coutts
  • Publication number: 20120107491
    Abstract: Thin films containing a transparent conducting oxide and a high permittivity material are disclosed. Exemplary thin films may exhibit increased transmission in the visible-to-near infrared (vis-NIR) spectrum without a decrease in electrical conductivity compared to the thin film without the high permittivity material. Methods for making thin films having enhanced optical properties without substantially decreased electrical quality are also disclosed.
    Type: Application
    Filed: January 5, 2012
    Publication date: May 3, 2012
    Applicant: ALLIANCE FOR SUSTAINABLE ENERGY, LLC
    Inventors: Xiaonan Li, James Burst, Timothy A. Gessert
  • Publication number: 20120097222
    Abstract: A method of producing thin-film transparent conducting oxide (TCO) materials and devices that incorporate the transparent conducting oxide materials are disclosed. The method described is for coating glass, polymers, foils, or electronic devices with a TCO having improved characteristics.
    Type: Application
    Filed: October 26, 2011
    Publication date: April 26, 2012
    Applicant: ALLIANCE FOR SUSTAINABLE ENERGY, LLC
    Inventors: TIMOTHY A. GESSERT, Xiaonan Li, Teresa Barnes, Carrie L. Wyse
  • Publication number: 20110197958
    Abstract: A tin-cadmium oxide film having an amorphous structure and a ratio of tin atoms to cadmium atoms of between 1:1 and 3:1. The tin-cadmium oxide film may have an optical band gap of between 2.7 eV and 3.35 eV. The film may also have a charge carrier concentration of between 1×1020 cm?3 and 2×1020 cm?3. The tin cadmium oxide film may also exhibit a Hall mobility of between 40 cm2V?1 s?1 and 60 cm2V?1 s?1. Also disclosed is a method of producing an amorphous tin-cadmium oxide film as described and devices using same.
    Type: Application
    Filed: February 12, 2010
    Publication date: August 18, 2011
    Applicant: ALLIANCE FOR SUSTAINABLE ENERGY, LLC
    Inventors: XIAONAN LI, Timothy A. Gessert
  • Publication number: 20110084239
    Abstract: Transparent conducting oxides and production thereof are disclosed. An exemplary method of producing a transparent conducting oxide (TCO) material may comprise: providing a TCO target (110) doped with either a high-permittivity oxide or a low-permittivity oxide in a process chamber (100). The method may also comprise depositing a metal oxide on the target (110) to form a thin film having enhanced optical properties without substantially decreasing electrical quality.
    Type: Application
    Filed: January 16, 2007
    Publication date: April 14, 2011
    Applicant: ALLIANCE FOR SUSTANABLE ENERGY LLC.
    Inventors: Timothy A. Gessert, Yuki Yoshida, Timothy J. Coutts
  • Publication number: 20100243437
    Abstract: An apparatus for dry deposition of thin films of cadmium telluride and other material layers required for a photovoltaic device. The apparatus includes a vacuum deposition chamber. A preheat station and source container are provided in the chamber, and the source container and material therein are heated to a deposition temperature. An integral shutter is placed in the chamber, and the shutter includes a planar body with a carrier receiver extending out from one end shaped as a two-prong fork or a closed loop. The shutter is positioned with the receiver and a received carrier in the preheat station and the body covering the source container outlet. The preheat station heats the carrier and sample to avoid thermal shock during deposition. The shutter is then positioned with the body moved from the source container outlet and the carrier receiver positioned to expose a sample surface to the deposition material.
    Type: Application
    Filed: March 25, 2010
    Publication date: September 30, 2010
    Applicant: Alliance for Sustainable Energy, LLC
    Inventors: Timothy A. Gessert, Teresa M. Barnes
  • Publication number: 20100171082
    Abstract: A transparent conducting oxide (TCO) film comprising: a TCO layer, and dopants selected from the elements consisting of Vanadium, Molybdenum, Tantalum, Niobium, Antimony, Titanium, Zirconium, and Hafnium, wherein the elements are n-type dopants; and wherein the transparent conducting oxide is characterized by an improved electron mobility of about 42 cm2/V-sec while simultaneously maintaining a high carrier density of ˜4.4e×1020 cm?3.
    Type: Application
    Filed: March 17, 2008
    Publication date: July 8, 2010
    Applicant: ALLIANCE FOR SUSTAINABLE ENERGY , LLC
    Inventors: Timothy A. Gessert, Joel N. Duenow, Teresa Barnes, Timothy J. Coutts
  • Publication number: 20090297886
    Abstract: Transparent conducting oxides and production thereof are disclosed. An exemplary method of producing a transparent conducting oxide (TCO) material may comprise: providing a TCO target doped with either a high-permittivity oxide or a low-permittivity oxide in a process chamber. The method may also comprise depositing a metal oxide on the target in the process chamber to form a thin film having enhanced optical properties without substantially decreasing electrical quality.
    Type: Application
    Filed: May 30, 2008
    Publication date: December 3, 2009
    Applicant: MIDWEST RESEARCH INSTITUTE
    Inventors: TIMOTHY A. GESSERT, TIMOTHY J. COUTTS, YUKI YOSHIDA