Excitonic effects in photovoltaic materials with large exciton binding energies

Stefan T. Omelchenko; Yulia Tolstova; Harry A. Atwater; Nathan S. Lewis

doi:10.1109/PVSC.2016.7750347

Excitonic effects in photovoltaic materials with large exciton binding energies

Stefan T. Omelchenko, Yulia Tolstova, Harry A. Atwater, Nathan S. Lewis

California Institute of Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

We investigate the effect of excitons on charge transport in photovoltaic materials with large exciton binding energies using Cu₂O as a model system. We develop a thermodynamic model to estimate the fraction of excitons in Cu₂O 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.

Original language	English
Title of host publication	2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	3616-3619
Number of pages	4
Volume	2016-November
ISBN (Electronic)	9781509027248
DOIs	https://doi.org/10.1109/PVSC.2016.7750347
Publication status	Published - Nov 18 2016
Event	43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 - Portland, United States Duration: Jun 5 2016 → Jun 10 2016

Other

Other	43rd IEEE Photovoltaic Specialists Conference, PVSC 2016
Country	United States
City	Portland
Period	6/5/16 → 6/10/16

ASJC Scopus subject areas

Control and Systems Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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10.1109/PVSC.2016.7750347

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Excitonic effects in photovoltaic materials with large exciton binding energies. / Omelchenko, Stefan T.; Tolstova, Yulia; Atwater, Harry A.; Lewis, Nathan S.

2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016. Vol. 2016-November Institute of Electrical and Electronics Engineers Inc., 2016. p. 3616-3619 7750347.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Omelchenko, ST, Tolstova, Y, Atwater, HA & Lewis, NS 2016, Excitonic effects in photovoltaic materials with large exciton binding energies. in 2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016. vol. 2016-November, 7750347, Institute of Electrical and Electronics Engineers Inc., pp. 3616-3619, 43rd IEEE Photovoltaic Specialists Conference, PVSC 2016, Portland, United States, 6/5/16. https://doi.org/10.1109/PVSC.2016.7750347

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