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Light-Assisted Electrochemical Shunt Passivation for Photovoltaic Devices

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method of passivating current-shunting defects in a photovoltaic device and such passivated photovoltaic devices are described. The photovoltaic device includes a thin film body with a superposed electrode comprised of a layer of transparent electrically conductive electrode material. The method includes converting the transparent, electrically conductive electrode material to a material having a higher electrical resistivity than the transparent electrically conductive electrode material or by removing the transparent conducting electrode material, by simultaneously: 1) immersing at least a portion of the electrode in a conversion reagent, 2) illuminating the immersed electrode with a suitable source of illumination, and 3) applying an appropriate electrical bias to activate the conversion.
Vijh, Aarohi (Sylvania, OH), Deng, Xunming (Sylvania, OH)
THE UNIVERSITY OF TOLEDO (2801 W. Bancroft Street, Toledo OH 43606)
11/ 578,359
April 15, 2005
[0002] This invention was made with Government support under AFRL-Kirtland "Lightweight and flexible thin film solar cells based on amorphous silicon and cadmium telluride" under contract F29601-02-C-0304 and National Renewable Energy Laboratory "High efficiency and high rate deposited amorphous silicon solar cells" under contract NDJ-2-30630-08. The government has certain rights in this invention.