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Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset

Drew Riley Orcid Logo, Paul Meredith Orcid Logo, Ardalan Armin, Oskar Sandberg Orcid Logo

The Journal of Physical Chemistry Letters, Volume: 13, Issue: 20, Pages: 4402 - 4409

Swansea University Authors: Drew Riley Orcid Logo, Paul Meredith Orcid Logo, Ardalan Armin, Oskar Sandberg Orcid Logo

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DOI (Published version): 10.1021/acs.jpclett.2c00791

Abstract

Despite general agreement that the generation of free charges in organic solar cells is driven by an energetic offset, power conversion efficiencies have been improved using low-offset blends. In this work, we explore the interconnected roles that exciton diffusion and lifetime play in the charge ge...

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Published in: The Journal of Physical Chemistry Letters
ISSN: 1948-7185 1948-7185
Published: American Chemical Society (ACS) 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60050
first_indexed 2022-06-23T14:33:55Z
last_indexed 2023-01-11T14:41:44Z
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spelling 2022-09-02T11:27:50.3539670 v2 60050 2022-05-19 Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset edca1c48f922393fa2b3cb84d8dc0e4a 0000-0001-6688-0694 Drew Riley Drew Riley true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd Ardalan Armin Ardalan Armin true false 9e91512a54d5aee66cd77851a96ba747 0000-0003-3778-8746 Oskar Sandberg Oskar Sandberg true false 2022-05-19 BGPS Despite general agreement that the generation of free charges in organic solar cells is driven by an energetic offset, power conversion efficiencies have been improved using low-offset blends. In this work, we explore the interconnected roles that exciton diffusion and lifetime play in the charge generation process under various energetic offsets. A detailed balance approach is used to develop an analytic framework for exciton dissociation and free-charge generation accounting for exciton diffusion to and dissociation at the donor–acceptor interface. For low-offset systems, we find the exciton lifetime to be a pivotal component in the charge generation process, as it influences both the exciton and CT state dissociation. These findings suggest that any novel low-offset material combination must have long diffusion lengths with long exciton lifetimes to achieve optimum charge generation yields. Journal Article The Journal of Physical Chemistry Letters 13 20 4402 4409 American Chemical Society (ACS) 1948-7185 1948-7185 26 5 2022 2022-05-26 10.1021/acs.jpclett.2c00791 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University SU Library paid the OA fee (TA Institutional Deal) This work was supported by the Welsh Government’s Ser̂ Cymru II Program through the European Regional Development Fund, Welsh European Funding Office, and the Swansea University strategic initiative in Sustainable Advanced Materials. A.A. is a Ser Cymru II Rising Star Fellow, and P.M. is a Se ̂ r̂ Cymru II National Research Chair. This work was also funded by UKRI through the EPSRC Program Grant EP/T028511/1 Application Targeted Integrated Photovoltaics. D.B.R. acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), [PGSD3-545694-2020]. 2022-09-02T11:27:50.3539670 2022-05-19T11:53:13.2032106 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Drew Riley 0000-0001-6688-0694 1 Paul Meredith 0000-0002-9049-7414 2 Ardalan Armin 3 Oskar Sandberg 0000-0003-3778-8746 4 60050__24385__49cbf803ac5f4837873e337269085117.pdf 60050.pdf 2022-06-23T15:32:32.8420671 Output 2352757 application/pdf Version of Record true Released under the terms of a Creative Commmons Attribution 4.0 International (CC BY 4.0) license true eng https://creativecommons.org/licenses/by/4.0/
title Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
spellingShingle Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
Drew Riley
Paul Meredith
Ardalan Armin
Oskar Sandberg
title_short Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
title_full Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
title_fullStr Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
title_full_unstemmed Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
title_sort Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
author_id_str_mv edca1c48f922393fa2b3cb84d8dc0e4a
31e8fe57fa180d418afd48c3af280c2e
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9e91512a54d5aee66cd77851a96ba747
author_id_fullname_str_mv edca1c48f922393fa2b3cb84d8dc0e4a_***_Drew Riley
31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith
22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
9e91512a54d5aee66cd77851a96ba747_***_Oskar Sandberg
author Drew Riley
Paul Meredith
Ardalan Armin
Oskar Sandberg
author2 Drew Riley
Paul Meredith
Ardalan Armin
Oskar Sandberg
format Journal article
container_title The Journal of Physical Chemistry Letters
container_volume 13
container_issue 20
container_start_page 4402
publishDate 2022
institution Swansea University
issn 1948-7185
1948-7185
doi_str_mv 10.1021/acs.jpclett.2c00791
publisher American Chemical Society (ACS)
college_str Faculty of Science and Engineering
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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
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description Despite general agreement that the generation of free charges in organic solar cells is driven by an energetic offset, power conversion efficiencies have been improved using low-offset blends. In this work, we explore the interconnected roles that exciton diffusion and lifetime play in the charge generation process under various energetic offsets. A detailed balance approach is used to develop an analytic framework for exciton dissociation and free-charge generation accounting for exciton diffusion to and dissociation at the donor–acceptor interface. For low-offset systems, we find the exciton lifetime to be a pivotal component in the charge generation process, as it influences both the exciton and CT state dissociation. These findings suggest that any novel low-offset material combination must have long diffusion lengths with long exciton lifetimes to achieve optimum charge generation yields.
published_date 2022-05-26T02:28:20Z
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