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Published June 2013 | public
Book Section - Chapter

Spectrum splitting photovoltaics: Polyhedral specular reflector design for ultra-high efficiency modules


A design for ultra-high efficiency solar modules (>50%) using spectrum splitting is proposed. In the polyhedral specular reflector design, seven subcells are arranged around a solid parallelepiped. Incident light enters the parallelepiped and is directed via specular reflection onto each subcell in order from highest to lowest bandgap. We analyze optical losses due to external concentration and parasitic absorption and optimize the design for >50% module efficiency. We find that moderate concentration designs (90-170x) with a high index parallelepiped and perfect shortpass filters meet target efficiencies and demonstrate an initial design.

Additional Information

© 2013 IEEE. This project was supported by the Dow Chemical Company and the DOE 'Light-Material Interactions in Energy Conversion' Energy Frontier Research Center under grant DESC0001293. The information, data, or work presented herein was funded in part by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award Number DE-AR0000333 and the Dow Full Spectrum Project. C. N. Eisler was supported by the by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program. The authors wish to thank Sunita Darbe, Michelle Dee, Matthew Escarra, Cris Flowers, Carrie Hofmann, and John Lloyd for helpful discussion and their continued support.

Additional details

August 19, 2023
October 17, 2023