The effect of radiative mid-gap trap states in organic photovoltaic devices

Oskar J. Sandberg; Nasim Zarrabi; Stefan Zeiske; Wei Li; Drew B. Riley; Paul Meredith; Ardalan Armin

doi:10.1117/12.2596040

1 August 2021 The effect of radiative mid-gap trap states in organic photovoltaic devices

Oskar J. Sandberg, Nasim Zarrabi, Stefan Zeiske, Wei Li, Drew B. Riley, Paul Meredith, Ardalan Armin

Proceedings Volume 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX; 1179918 (2021) https://doi.org/10.1117/12.2596040
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

The spectral shape near the energy gap determines the radiative limit of the open-circuit voltage in organic photovoltaic devices. In this work, we employ ultrasensitive photocurrent measurements and detect sub-gap states with energies far below gap in a large number of different donor-acceptor blends. We provide evidence that these low-energy sub-gap states are associated with radiative mid-gap trap states, generating photocurrent via an optical release process. To account for the radiative mid-gap states, we implement a two-diode model which accurately describes both the dark current and the open-circuit voltage in organic solar cells. These findings provide important insights for our current understanding of organic photovoltaic devices.

Conference Presentation

Citation Download Citation

Oskar J. Sandberg, Nasim Zarrabi, Stefan Zeiske, Wei Li, Drew B. Riley, Paul Meredith, and Ardalan Armin "The effect of radiative mid-gap trap states in organic photovoltaic devices", Proc. SPIE 11799, Physical Chemistry of Semiconductor Materials and Interfaces XX, 1179918 (1 August 2021); https://doi.org/10.1117/12.2596040

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