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Broad spectrum solar cell

United States Patent

May 15, 2007
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
An alloy having a large band gap range is used in a multijunction solar cell to enhance utilization of the solar energy spectrum. In one embodiment, the alloy is In.sub.1-xGa.sub.xN having an energy bandgap range of approximately 0.7 eV to 3.4 eV, providing a good match to the solar energy spectrum. Multiple junctions having different bandgaps are stacked to form a solar cell. Each junction may have different bandgaps (realized by varying the alloy composition), and therefore be responsive to different parts of the spectrum. The junctions are stacked in such a manner that some bands of light pass through upper junctions to lower junctions that are responsive to such bands.
Walukiewicz; Wladyslaw (Kensington, CA), Yu; Kin Man (Lafayette, CA), Wu; Junqiao (Richmond, CA), Schaff; William J. (Ithaca, NY)
Cornell Research Foundation, Inc. (Ithaca, NY), The Regents of the University of California (Oakland, CA)
10/ 445,711
May 27, 2003
GOVERNMENT FUNDING The invention described herein was made with U.S. Government support under Grant Number DE-AC03-76SF00098 awarded by the U.S. Department of Energy, Grant Number N00014-99-1-0936 awarded by Office of Naval Research, and Grant Number DMR-0109844 awarded by the National Science Foundation. The United States Government has certain rights in the invention.