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Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination

Derya Baran, Nicola Gasparini, Andrew Wadsworth, Ching Hong Tan, Nimer Wehbe, Xin Song, Zeinab Hamid, Weimin Zhang, Marios Neophytou, Thomas Kirchartz, Christoph J. Brabec, James Durrant Orcid Logo, Iain McCulloch

Nature Communications, Volume: 9, Issue: 1

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1038/s41467-018-04502-3

Abstract

Nonfullerene solar cells have increased their efficiencies up to 13%, yet quantum efficiencies are still limited to 80%. Here we report efficient nonfullerene solar cells with quantum efficiencies approaching unity. This is achieved with overlapping absorption bands of donor and acceptor that increa...

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Published in: Nature Communications
ISSN: 2041-1723
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa40647
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last_indexed 2020-10-07T03:06:21Z
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spelling 2020-10-06T13:20:42.1370205 v2 40647 2018-06-06 Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2018-06-06 MTLS Nonfullerene solar cells have increased their efficiencies up to 13%, yet quantum efficiencies are still limited to 80%. Here we report efficient nonfullerene solar cells with quantum efficiencies approaching unity. This is achieved with overlapping absorption bands of donor and acceptor that increases the photon absorption strength in the range from about 570 to 700 nm, thus, almost all incident photons are absorbed in the active layer. The charges generated are found to dissociate with negligible geminate recombination losses resulting in a short-circuit current density of 20 mA cm−2 along with open-circuit voltages >1 V, which is remarkable for a 1.6 eV bandgap system. Most importantly, the unique nano-morphology of the donor:acceptor blend results in a substantially improved stability under illumination. Understanding the efficient charge separation in nonfullerene acceptors can pave the way to robust and recombination-free organic solar cells. Journal Article Nature Communications 9 1 2041-1723 31 12 2018 2018-12-31 10.1038/s41467-018-04502-3 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-10-06T13:20:42.1370205 2018-06-06T09:09:20.6344677 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Derya Baran 1 Nicola Gasparini 2 Andrew Wadsworth 3 Ching Hong Tan 4 Nimer Wehbe 5 Xin Song 6 Zeinab Hamid 7 Weimin Zhang 8 Marios Neophytou 9 Thomas Kirchartz 10 Christoph J. Brabec 11 James Durrant 0000-0001-8353-7345 12 Iain McCulloch 13 0040647-06062018091104.pdf baran2018.pdf 2018-06-06T09:11:04.0800000 Output 1146252 application/pdf Version of Record true 2018-06-06T00:00:00.0000000 true eng
title Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
spellingShingle Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
James Durrant
title_short Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
title_full Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
title_fullStr Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
title_full_unstemmed Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
title_sort Robust nonfullerene solar cells approaching unity external quantum efficiency enabled by suppression of geminate recombination
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Derya Baran
Nicola Gasparini
Andrew Wadsworth
Ching Hong Tan
Nimer Wehbe
Xin Song
Zeinab Hamid
Weimin Zhang
Marios Neophytou
Thomas Kirchartz
Christoph J. Brabec
James Durrant
Iain McCulloch
format Journal article
container_title Nature Communications
container_volume 9
container_issue 1
publishDate 2018
institution Swansea University
issn 2041-1723
doi_str_mv 10.1038/s41467-018-04502-3
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 Nonfullerene solar cells have increased their efficiencies up to 13%, yet quantum efficiencies are still limited to 80%. Here we report efficient nonfullerene solar cells with quantum efficiencies approaching unity. This is achieved with overlapping absorption bands of donor and acceptor that increases the photon absorption strength in the range from about 570 to 700 nm, thus, almost all incident photons are absorbed in the active layer. The charges generated are found to dissociate with negligible geminate recombination losses resulting in a short-circuit current density of 20 mA cm−2 along with open-circuit voltages >1 V, which is remarkable for a 1.6 eV bandgap system. Most importantly, the unique nano-morphology of the donor:acceptor blend results in a substantially improved stability under illumination. Understanding the efficient charge separation in nonfullerene acceptors can pave the way to robust and recombination-free organic solar cells.
published_date 2018-12-31T03:51:45Z
_version_ 1763752547567271936
score 11.013148

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