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

Riley, Drew; Meredith, Paul; Armin, Ardalan; Sandberg, Oskar

doi:10.1021/acs.jpclett.2c00791

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

Drew Riley, Paul Meredith

, Ardalan Armin

, Oskar Sandberg

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

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

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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
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa60050
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first_indexed	2022-06-23T14:33:55Z
last_indexed	2023-01-11T14:41:44Z
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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.</abstract><type>Journal Article</type><journal>The Journal of Physical Chemistry Letters</journal><volume>13</volume><journalNumber>20</journalNumber><paginationStart>4402</paginationStart><paginationEnd>4409</paginationEnd><publisher>American Chemical Society (ACS)</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>1948-7185</issnPrint><issnElectronic>1948-7185</issnElectronic><keywords/><publishedDay>26</publishedDay><publishedMonth>5</publishedMonth><publishedYear>2022</publishedYear><publishedDate>2022-05-26</publishedDate><doi>10.1021/acs.jpclett.2c00791</doi><url/><notes/><college>COLLEGE NANME</college><department>Physics</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>SPH</DepartmentCode><institution>Swansea University</institution><apcterm>SU Library paid the OA fee (TA Institutional Deal)</apcterm><funders>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. 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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 Drew Riley Drew Riley true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 9e91512a54d5aee66cd77851a96ba747 0000-0003-3778-8746 Oskar Sandberg Oskar Sandberg true false 2022-05-19 SPH 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 Physics COLLEGE CODE SPH 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 1 Paul Meredith 0000-0002-9049-7414 2 Ardalan Armin 0000-0002-6129-5354 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 22b270622d739d81e131bec7a819e2fd 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_title	Faculty of Science and Engineering
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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	2022-05-26T04:17:50Z
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score	10.997843

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

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