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Fundamental Photovoltaic Efficiency Limits Due to Semiconductor Band Tails

Wong, Joeson and Omelchenko, Stefan T. and Atwater, Harry A. (2021) Fundamental Photovoltaic Efficiency Limits Due to Semiconductor Band Tails. In: 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC). IEEE , Piscataway, NJ, pp. 1315-1317. ISBN 978-1-6654-1922-2. https://resolver.caltech.edu/CaltechAUTHORS:20211109-230013535

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Abstract

The theoretical maximum efficiency of a solar cell is given by the Shockley-Queisser limit, which assumes an abrupt onset of absorption near the band-edge. However, real materials always have an imperfect band-edge, which is usually characterized by an Urbach tail. By using optoelectronic reciprocity relations and explicitly accounting for band filling, we develop a modified detailed balance model that explicitly accounts for non-abrupt band-edges. We find that large band tails can result in an effective Stokes shift between the absorption onset and luminescence peak, which results in a penalty on the maximum efficiency of a solar cell.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/pvsc43889.2021.9518548DOIArticle
ORCID:
AuthorORCID
Wong, Joeson0000-0002-6304-7602
Omelchenko, Stefan T.0000-0003-1104-9291
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2021 IEEE.
Subject Keywords:Efficiency, Voltage, Band Tails, Luminescence, Absorption
DOI:10.1109/pvsc43889.2021.9518548
Record Number:CaltechAUTHORS:20211109-230013535
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20211109-230013535
Official Citation:J. Wong, S. T. Omelchenko and H. A. Atwater, "Fundamental Photovoltaic Efficiency Limits Due to Semiconductor Band Tails," 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 2021, pp. 1315-1317, doi: 10.1109/PVSC43889.2021.9518548
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111811
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 Nov 2021 19:33
Last Modified:11 Nov 2021 19:33

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