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Experimental demonstration of enhanced photon recycling in angle-restricted GaAs solar cells

Kosten, Emily D. and Kayes, Brendan M. and Atwater, Harry A. (2014) Experimental demonstration of enhanced photon recycling in angle-restricted GaAs solar cells. Energy and Environmental Science, 7 (6). pp. 1907-1912. ISSN 1754-5692. doi:10.1039/c3ee43584a.

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For cells near the radiative limit, optically limiting the angles of emitted light causes emitted photons to be recycled back to the cell, leading to enhancement in voltage and efficiency. While this has been understood theoretically for some time, only recently have GaAs cells reached sufficient quality for the effect to be experimentally observed. Here, as proof of concept, we demonstrate enhanced photon recycling and open-circuit voltage (V_(oc)) experimentally using a narrow band dielectric multilayer angle restrictor on a high quality GaAs cell. With angle restriction we observe a clear decrease in the radiative dark current, which is consistent with the observed V_(oc) increase. Furthermore, we observe larger V_(oc) enhancements for cells that are closer to the radiative limit, and that more closely coupling the angle restrictor to the cell leads to greater V_(oc) gains, emphasizing the optical nature of the effect.

Item Type:Article
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Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2014 The Royal Society of Chemistry. Received 31 Oct 2013, Accepted 15 Apr 2014, First published online 15 Apr 2014. Thanks to M. Sheldon, E. Warmann, J. Bosco, and C. Eisler for useful discussions and comments and to J. Lloyd for assistance with figure preparation. This work was supported by the the ‘Light-Material Interactions in Energy Conversion’ Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001293. E.K. is also the recipient of a Resnick Sustainability Institute Graduate Fellowship.
Group:Resnick Sustainability Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001293
Resnick Sustainability InstituteUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20140609-132709772
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46157
Deposited By: Tony Diaz
Deposited On:09 Jun 2014 21:24
Last Modified:10 Nov 2021 17:21

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