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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. (2017) Excitonic effects in photovoltaic materials with large exciton binding energies. In: 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC). IEEE , Piscataway, NJ, pp. 1-4. ISBN 978-1-5090-5605-7. http://resolver.caltech.edu/CaltechAUTHORS:20180601-090256322

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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
https://doi.org/10.1109/PVSC.2017.8366860DOIArticle
https://ieeexplore.ieee.org/document/8366860PublisherArticle
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:© 2017 IEEE.
Group:JCAP
Record Number:CaltechAUTHORS:20180601-090256322
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180601-090256322
Official Citation:S. T. Omelchenko, Y. Tolstova, H. A. Atwater and N. S. Lewis, "Excitonic effects in photovoltaic materials with large exciton binding energies," 2017 IEEE 44th Photovoltaic Specialist Conference (PVSC), Washington, DC, USA, 2017, pp. 1-4. doi: 10.1109/PVSC.2017.8366860
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86738
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Jun 2018 16:11
Last Modified:01 Jun 2018 16:11

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