Patents by Inventor Randall J. Ellingson

Randall J. Ellingson 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).

  • Inexpensive, earth-abundant, tunable hole transport material for CdTe solar cells
    Patent number: 11251385
    Abstract: Hole transport layers, electron transport layers, layer stacks, and optoelectronic devices involving perovskite materials and materials used as precursors, and methods of making the same, are described.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: February 15, 2022
    Assignee: The University of Toledo
    Inventors: Randall J. Ellingson, Khagendra P. Bhandari, Michael Heben, Suneth Watthage, Zhaoning Song
  • PERC-like contact to CdTe solar cells
    Patent number: 11189748
    Abstract: Methods for forming electrical contacts with CdTe layers, methods for forming photovoltaic devices, methods for passivating a CdTe surface, and photovoltaic devices are described.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: November 30, 2021
    Assignee: The University of Toledo
    Inventors: Michael J. Heben, Adam B. Phillips, Fadhil K. Alfadhili, Randall J. Ellingson, Ebin Bastola, Dipendra Pokhrel, Kamala Khanal Subedi
  • PERC-like Contact to CdTe Solar Cells
    Publication number: 20200343403
    Abstract: Methods for forming electrical contacts with CdTe layers, methods for forming photovoltaic devices, methods for passivating a CdTe surface, and photovoltaic devices are described.
    Type: Application
    Filed: April 29, 2020
    Publication date: October 29, 2020
    Applicant: The University of Toledo
    Inventors: Michael J. Heben, Adam B. Phillips, Fadhil K. Alfadhili, Randall J. Ellingson, Ebin Bastola, Dipendra Pokhrel, Kamala Khanal Subedi
  • Inexpensive, Earth-Abundant, Tunable Hole Transport Material For CdTe Solar Cells
    Publication number: 20180219166
    Abstract: Hole transport layers, electron transport layers, layer stacks, and optoelectronic devices involving perovskite materials and materials used as precursors, and methods of making the same, are described.
    Type: Application
    Filed: January 26, 2018
    Publication date: August 2, 2018
    Applicant: The University of Toledo
    Inventors: Randall J. Ellingson, Khagendra P. Bhandari, Michael Heben, Suneth Watthage, Zhaoning Song
  • Tunable optical parametric oscillator
    Patent number: 5579152
    Abstract: A broadly tunable femtosecond optical parametric generator includes a cavity having a pumping section in which is located a nonlinear crystal selected from the group CTA and RTA, cut for noncritical phasematching. The plane of the optical x axis and or the optical y axis of the crystal is aligned with the axis of the pumping section. A Ti:S laser pumping beam is directed into the pumping section either collinearly or noncollinearly with the pumping section axis and impinges on the crystal to produce signal and idler beams. The laser is tunable to produce OPO output beams between about 1 and 4 .mu.m.
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: November 26, 1996
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Randall J. Ellingson, Peter E. Powers, Lap K. Cheng, Chung L. Tang
  • Intracavity-doubled tunable optical parametric oscillator
    Patent number: 5406408
    Abstract: A Ti:sapphire-pumped intracavity-doubled optical parametric oscillator generates up to 240 mW of sub100 femtosecond pulses tunable in the visible. The OPO consists of a 1.5 mm thick KTP crystal configured in a linear or a ring cavity which is synchronously pumped by a self-mode-locked Ti:sapphire laser. Intracavity doubling of the OPO is accomplished by inserting a .beta.-barium borate crystal into an additional focus in the OPO cavity. Continuous tuning of the second harmonic signal from 580 to 657 nm is obtained, with a potential tuning range being approximately 500 to 800 nm.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: April 11, 1995
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Randall J. Ellingson, Chung L. Tang
  • Intracavity-doubled tunable optical parametric oscillator
    Patent number: 5296960
    Abstract: A Ti:sapphire-pumped intracavity-doubled optical parametric oscillator generates up to 240 mW of sub100 femtosecond pulses tunable in the visible. The OPO consists of a 1.5 mm thick KTP crystal configured in a ring cavity which is synchronously pumped by a self-mode-locked Ti:sapphire laser. Intracavity doubling of the OPO is accomplished by inserting a .beta.-barium borate crystal into an additional focus in the OPO cavity. Continuous tuning of the second harmonic signal from 580 to 657 nm is obtained, with a potential tuning range being approximately 500 to 800 nm.
    Type: Grant
    Filed: February 26, 1993
    Date of Patent: March 22, 1994
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Randall J. Ellingson, Chung L. Tang