Excitonic effects in photovoltaic materials with large exciton binding energies

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

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
Title of host publication2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3616-3619
Number of pages4
Volume2016-November
ISBN (Electronic)9781509027248
DOIs
Publication statusPublished - Nov 18 2016
Event43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 - Portland, United States
Duration: Jun 5 2016Jun 10 2016

Other

Other43rd IEEE Photovoltaic Specialists Conference, PVSC 2016
CountryUnited States
CityPortland
Period6/5/166/10/16

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ASJC Scopus subject areas

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

Cite this

Omelchenko, S. T., Tolstova, Y., Atwater, H. A., & Lewis, N. S. (2016). Excitonic effects in photovoltaic materials with large exciton binding energies. In 2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016 (Vol. 2016-November, pp. 3616-3619). [7750347] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2016.7750347