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

Eisler, Carissa N. and Kosten, Emily D. and Warmann, Emily C. and Atwater, Harry A. (2013) Spectrum splitting photovoltaics: Polyhedral specular reflector design for ultra-high efficiency modules. In: IEEE 39th Photovoltaic Specialists Conference. IEEE , Piscataway, NJ, pp. 1848-1851. ISBN 978-1-4799-3299-3.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription DOIArticle
Eisler, Carissa N.0000-0002-5755-5280
Warmann, Emily C.0000-0002-2810-4608
Atwater, Harry A.0000-0001-9435-0201
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.
Funding AgencyGrant Number
Dow Chemical CompanyUNSPECIFIED
Department of Energy (DOE)DE-SC0001293
Advanced Research Projects Agency-Energy (ARPA-E)UNSPECIFIED
Department of Energy (DOE)DE-AR0000333
Dow Full Spectrum ProjectUNSPECIFIED
Department of Defense (DoD)UNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Subject Keywords:spectrum splitting, multijunction cells
Record Number:CaltechAUTHORS:20140918-104519581
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Official Citation:Eisler, C.N.; Kosten, E.D.; Warmann, E.C.; Atwater, H.A, "Spectrum splitting photovoltaics: Polyhedral specular reflector design for ultra-high efficiency modules," Photovoltaic Specialists Conference (PVSC), 2013 IEEE 39th , vol., no., pp.1848,1851, 16-21 June 2013 doi: 10.1109/PVSC.2013.6744502 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49817
Deposited By: Tony Diaz
Deposited On:18 Sep 2014 22:23
Last Modified:10 Nov 2021 18:48

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