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.2017.8366860

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

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	2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1-4
Number of pages	4
ISBN (Electronic)	9781509056057
DOIs	https://doi.org/10.1109/PVSC.2017.8366860
Publication status	Published - May 25 2018
Event	44th IEEE Photovoltaic Specialist Conference, PVSC 2017 - Washington, United States Duration: Jun 25 2017 → Jun 30 2017

Other

Other	44th IEEE Photovoltaic Specialist Conference, PVSC 2017
Country	United States
City	Washington
Period	6/25/17 → 6/30/17

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials

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10.1109/PVSC.2017.8366860

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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.

2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017. Institute of Electrical and Electronics Engineers Inc., 2018. p. 1-4.

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

Omelchenko, ST, Tolstova, Y, Atwater, HA & Lewis, NS 2018, Excitonic effects in photovoltaic materials with large exciton binding energies. in 2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017. Institute of Electrical and Electronics Engineers Inc., pp. 1-4, 44th IEEE Photovoltaic Specialist Conference, PVSC 2017, Washington, United States, 6/25/17. https://doi.org/10.1109/PVSC.2017.8366860

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