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Effects of Sub-gap Absorption on Photovoltaic Performance

Omelchenko, Stefan T. and Wong, Joeson and Lewis, Nathan S. and Atwater, Harry A. (2018) Effects of Sub-gap Absorption on Photovoltaic Performance. In: 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC). IEEE , Piscataway, NJ, pp. 1837-1840. ISBN 9781538685297. http://resolver.caltech.edu/CaltechAUTHORS:20181210-140401951

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Abstract

The theoretical maximum photovoltaic efficiency is bounded by the Shockley-Queisser model which assumes that the photovoltaic material has step-function like absorptance, with zero absorption below its bandgap and perfect absorption above. However, typical photovoltaic materials exhibit absorption with an exponential dependence below its bandgap, known as the“Urbach tail” whose steepness is dependent on the Urbach parameter. Using a modified detailed balance model that accounts for sub-gap absorption we show that photovoltaic performance is strongly affected by the magnitude of the Urbach parameter.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/pvsc.2018.8547909DOIArticle
ORCID:
AuthorORCID
Omelchenko, Stefan T.0000-0003-1104-9291
Wong, Joeson0000-0002-6304-7602
Lewis, Nathan S.0000-0001-5245-0538
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2018 IEEE.
Subject Keywords:detailed balance, Shockley-Queisser limit Urbach tail, sub-gap absorption
Record Number:CaltechAUTHORS:20181210-140401951
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181210-140401951
Official Citation:S. T. Omelchenko, J. Wong, N. S. Lewis and H. A. Atwater, "Effects of Sub-gap Absorption on Photovoltaic Performance," 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC), Waikoloa Village, HI, USA, 2018, pp. 1837-1840. doi: 10.1109/PVSC.2018.8547909
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91656
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:10 Dec 2018 22:49
Last Modified:10 Dec 2018 22:49

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