Patents by Inventor Richard E. Brownfield

Richard E. Brownfield 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).

  • Electrodeposited doped II-VI semiconductor films and devices incorporating such films
    Patent number: 4909857
    Abstract: A method of electrodepositing a doped compound semiconductor film including tellurium and a metal selected from Group IIB of the Period Table of Elements by adding an effective concentration of dopant ions to the electrolyte bath. Cadmium telluride, mercury cadmium telluride and zinc cadmium telluride may be doped with copper, silver and gold. The conductivity type of the electrodeposited doped layers may be changed by a heat treatment. Thin film photovoltaic cells incorporating the doped layer to form a heterojunction with a semiconductor layer of the opposite conductivity type show substantial improvements in open circuit voltage, fill factor and efficiency over similar devices employing undoped electrodeposited layers.
    Type: Grant
    Filed: December 21, 1988
    Date of Patent: March 20, 1990
    Assignee: Standard Oil Company
    Inventors: Miroslav Ondris, Marty A. Pichler, Richard E. Brownfield
  • Electrodeposited doped II-VI semiconductor films and devices incorporating such films
    Patent number: 4816120
    Abstract: A method of electrodepositing a doped compound semiconductor film including tellurium and a metal selected from Group IIB of the Period Table of Elements by adding an effective concentration of dopant ions to the electrolyte bath. Cadmium telluride, mercury cadmium telluride and zinc cadmium telluride may be doped with copper, silver and gold. The conductivity type of the electrodeposited doped layers may be changed by a heat treatment. Thin film photovoltaic cells incorporating the doped layer to form a heterojunction with a semiconductor layer of the opposite conductivity type show substantial improvements in open circuit voltage, fill factor and efficiency over similar devices employing undoped electrodeposited layers.
    Type: Grant
    Filed: January 26, 1988
    Date of Patent: March 28, 1989
    Assignee: The Standard Oil Company
    Inventors: Miroslav Ondris, Marty A. Pichler, Richard E. Brownfield