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Published June 2014 | public
Book Section - Chapter

Electrically independent subcircuits for a seven-junction spectrum splitting photovoltaic module


An electrical system that facilitates independent electrical connection of subcells with different bandgaps is required in order to optimally extract two-terminal power generated by spectrum-splitting photovoltaics. We have designed such a system for a seven subcell spectrum-splitting module using commercially available electrical components. Modified detailed balance modeling of the subcells coupled with HSPICE circuit simulation results in 87.5% power-weighted average subcell-to-grid electrical efficiency. Additional analysis indicates electrical efficiencies in excess of 95% are possible with custom power conditioning components and appropriately designed contacts.

Additional Information

© 2014 IEEE. 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 by the Dow Chemical Company. C. A. Flowers was supported by the by the National Science Foundation (NSF) through the NSF Graduate Research Fellowship Program (NSFGRFP). C. N. Eisler was supported by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program. The authors especially wish to thank Emily Warmann for helpful discussion and detailed balance code, as well as the Full Spectrum Photovoltaics team for useful insight, discussion, and ongoing support.

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August 20, 2023
October 24, 2023