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 | ||||||||
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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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