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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
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URI: https://cronfa.swan.ac.uk/Record/cronfa55819
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spelling 2021-01-26T16:01:06.6909759 v2 55819 2020-12-03 Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2020-12-03 MTLS 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. Journal Article Advanced Energy Materials 10 47 2002124 Wiley 1614-6832 1614-6840 charge generation; driving force; field‐dependent; organic solar cells; ultrafast spectroscopy 15 12 2020 2020-12-15 10.1002/aenm.202002124 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2021-01-26T16:01:06.6909759 2020-12-03T10:28:08.2051819 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Vasileios C. Nikolis 1 Yifan Dong 2 Jonas Kublitski 3 Johannes Benduhn 4 Xijia Zheng 5 Chengye Huang 6 A. Celil Yüzer 7 Mine Ince 8 Donato Spoltore 9 James Durrant 0000-0001-8353-7345 10 Artem A. Bakulin 11 Koen Vandewal 12 55819__19185__9afc43a0e1984d29a30a3fc6854eb09a.pdf 55819.pdf 2021-01-26T15:58:57.7859756 Output 1025938 application/pdf Version of Record true © 2020 The Authors. This is an open access article under the terms of the Creative Commons Attribution License true eng http://creativecommons.org/licenses/by/4.0/
title Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
spellingShingle Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
James Durrant
title_short Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
title_full Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
title_fullStr Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
title_full_unstemmed Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
title_sort Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Vasileios C. Nikolis
Yifan Dong
Jonas Kublitski
Johannes Benduhn
Xijia Zheng
Chengye Huang
A. Celil Yüzer
Mine Ince
Donato Spoltore
James Durrant
Artem A. Bakulin
Koen Vandewal
format Journal article
container_title Advanced Energy Materials
container_volume 10
container_issue 47
container_start_page 2002124
publishDate 2020
institution Swansea University
issn 1614-6832
1614-6840
doi_str_mv 10.1002/aenm.202002124
publisher Wiley
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description 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.
published_date 2020-12-15T04:10:18Z
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score 11.037144

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