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Slower carriers limit charge generation in organic semiconductor light-harvesting systems

Martin Stolterfoht, Ardalan Armin Orcid Logo, Safa Shoaee, Ivan Kassal, Paul Burn, Paul Meredith Orcid Logo

Nature Communications, Volume: 7, Issue: 1, Start page: 11944

Swansea University Authors: Ardalan Armin Orcid Logo, Paul Meredith Orcid Logo

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DOI (Published version): 10.1038/ncomms11944

Abstract

Blends of electron donating and accepting organic semiconductors are widely used as photoactive materials in next generation solar cells and photodetectors. The yield of free charges in these systems is often determined by the separation of interfacial electron-hole pairs, which is expected to depen...

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Published in: Nature Communications
ISSN: 2041-1723
Published: Springer Science and Business Media LLC 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa33779
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first_indexed 2017-05-19T19:00:59Z
last_indexed 2023-01-11T14:07:57Z
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spelling 2022-12-05T12:27:15.6254888 v2 33779 2017-05-19 Slower carriers limit charge generation in organic semiconductor light-harvesting systems 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 2017-05-19 SPH Blends of electron donating and accepting organic semiconductors are widely used as photoactive materials in next generation solar cells and photodetectors. The yield of free charges in these systems is often determined by the separation of interfacial electron-hole pairs, which is expected to depend on the ability of the faster carrier to escape the Coulomb potential. Here we show, by measuring geminate and non-geminate losses and key transport parameters in a series of bulk-heterojunction solar cells, that the charge-generation yield increases with increasing slower carrier mobility. This is in direct contrast with the well-established Braun model where the dissociation rate is proportional to the mobility sum, and recent models that underscore the importance of fullerene aggregation for coherent electron propagation. The behavior is attributed to the restriction of opposite charges to different phases, and to an entropic contribution that favors the joint separation of both charge carriers. Journal Article Nature Communications 7 1 11944 Springer Science and Business Media LLC 2041-1723 organic solar cells, organic semiconductor physics, transport physics and carrier mobility 1 9 2016 2016-09-01 10.1038/ncomms11944 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2022-12-05T12:27:15.6254888 2017-05-19T15:00:50.7749966 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Martin Stolterfoht 1 Ardalan Armin 0000-0002-6129-5354 2 Safa Shoaee 3 Ivan Kassal 4 Paul Burn 5 Paul Meredith 0000-0002-9049-7414 6 0033779-19052017150149.pdf published.pdf 2017-05-19T15:01:49.0870000 Output 667421 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title Slower carriers limit charge generation in organic semiconductor light-harvesting systems
spellingShingle Slower carriers limit charge generation in organic semiconductor light-harvesting systems
Ardalan Armin
Paul Meredith
title_short Slower carriers limit charge generation in organic semiconductor light-harvesting systems
title_full Slower carriers limit charge generation in organic semiconductor light-harvesting systems
title_fullStr Slower carriers limit charge generation in organic semiconductor light-harvesting systems
title_full_unstemmed Slower carriers limit charge generation in organic semiconductor light-harvesting systems
title_sort Slower carriers limit charge generation in organic semiconductor light-harvesting systems
author_id_str_mv 22b270622d739d81e131bec7a819e2fd
31e8fe57fa180d418afd48c3af280c2e
author_id_fullname_str_mv 22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith
author Ardalan Armin
Paul Meredith
author2 Martin Stolterfoht
Ardalan Armin
Safa Shoaee
Ivan Kassal
Paul Burn
Paul Meredith
format Journal article
container_title Nature Communications
container_volume 7
container_issue 1
container_start_page 11944
publishDate 2016
institution Swansea University
issn 2041-1723
doi_str_mv 10.1038/ncomms11944
publisher Springer Science and Business Media LLC
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 Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
active_str 0
description Blends of electron donating and accepting organic semiconductors are widely used as photoactive materials in next generation solar cells and photodetectors. The yield of free charges in these systems is often determined by the separation of interfacial electron-hole pairs, which is expected to depend on the ability of the faster carrier to escape the Coulomb potential. Here we show, by measuring geminate and non-geminate losses and key transport parameters in a series of bulk-heterojunction solar cells, that the charge-generation yield increases with increasing slower carrier mobility. This is in direct contrast with the well-established Braun model where the dissociation rate is proportional to the mobility sum, and recent models that underscore the importance of fullerene aggregation for coherent electron propagation. The behavior is attributed to the restriction of opposite charges to different phases, and to an entropic contribution that favors the joint separation of both charge carriers.
published_date 2016-09-01T03:41:51Z
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score 11.013148

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