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Excitonic effects in photovoltaic materials with large exciton binding energies

Omelchenko, Stefan T. and Tolstova, Yulia and Atwater, Harry A. and Lewis, Nathan S. (2016) Excitonic effects in photovoltaic materials with large exciton binding energies. In: IEEE 43rd Photovoltaic Specialists Conference. IEEE , Piscataway, NJ, pp. 3616-3619. ISBN 978-1-5090-2724-8. http://resolver.caltech.edu/CaltechAUTHORS:20161128-152532394

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Abstract

We investigate the effect of excitons on charge transport in photovoltaic materials with large exciton binding energies using Cu_2O as a model system. We develop a thermodynamic model to estimate the fraction of excitons in Cu_2O at quasi-equilibrium and find that over 20% of the generated population of carriers during photovoltaic operation could be excitons. Experiments show the presence of excitons at room temperature under visible light excitation and current collection due to excitons during device operation. This work demonstrates that excitons can play a fundamental role in photovoltaic materials with large exciton binding energies and lays the foundation for further studies.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1109/PVSC.2016.7750347 DOIArticle
http://ieeexplore.ieee.org/document/7750347/PublisherArticle
ORCID:
AuthorORCID
Omelchenko, Stefan T.0000-0003-1104-9291
Atwater, Harry A.0000-0001-9435-0201
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2016 IEEE.
Group:JCAP
Subject Keywords:Excitons, Photovoltaic systems, Photoluminescence, Photonic band gap, Photovoltaic cells
Record Number:CaltechAUTHORS:20161128-152532394
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161128-152532394
Official Citation:S. T. Omelchenko, Y. Tolstova, H. A. Atwater and N. S. Lewis, "Excitonic effects in photovoltaic materials with large exciton binding energies," 2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC), Portland, OR, USA, 2016, pp. 3616-3619. doi: 10.1109/PVSC.2016.7750347 URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7750347&isnumber=7749395
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72342
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Nov 2016 23:51
Last Modified:26 Jan 2017 19:59

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