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Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells

Vasileios C. Nikolis, Yifan Dong, Jonas Kublitski, Johannes Benduhn, Xijia Zheng, Chengye Huang, A. Celil Yüzer, Mine Ince, Donato Spoltore, James Durrant Orcid Logo, Artem A. Bakulin, Koen Vandewal

Advanced Energy Materials, Volume: 10, Issue: 47, Start page: 2002124

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1002/aenm.202002124

Abstract

Efficient charge generation in organic semiconductors usually requires an interface with an energetic gradient between an electron donor and an electron acceptor in order to dissociate the photogenerated excitons. However, single-component organic solar cells based on chloroboron subnaphthalocyanine...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: Wiley 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa55819
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Abstract: Efficient charge generation in organic semiconductors usually requires an interface with an energetic gradient between an electron donor and an electron acceptor in order to dissociate the photogenerated excitons. However, single-component organic solar cells based on chloroboron subnaphthalocyanine (SubNc) have been reported to provide considerable photocurrents despite the absence of an energy gradient at the interface with an acceptor. In this work, it is shown that this is not due to direct free carrier generation upon illumination of SubNc, but due to a field-assisted exciton dissociation mechanism specific to the device configuration. Subsequently, the implications of this effect in bilayer organic solar cells with SubNc as the donor are demonstrated, showing that the external and internal quantum efficiencies in such cells are independent of the donor-acceptor interface energetics. This previously unexplored mechanism results in efficient photocurrent generation even though the driving force is minimized and the open-circuit voltage is maximized.
Keywords: charge generation; driving force; field‐dependent; organic solar cells; ultrafast spectroscopy
College: Faculty of Science and Engineering
Issue: 47
Start Page: 2002124

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