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Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier

Oskar Sandberg Orcid Logo, Ardalan Armin

The Journal of Physical Chemistry C, Volume: 125, Issue: 28, Pages: 15590 - 15598

Swansea University Authors: Oskar Sandberg Orcid Logo, Ardalan Armin

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DOI (Published version): 10.1021/acs.jpcc.1c03656

Abstract

The thermodynamic limit for the efficiency of solar cells is predominantly defined by the energy band gap of the used semiconductor. In the case of organic solar cells, both energetics and kinetics of three different species play a role: excitons, charge transfer (CT) states, and charge-separated st...

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Published in: The Journal of Physical Chemistry C
ISSN: 1932-7447 1932-7455
Published: American Chemical Society (ACS) 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa57309
first_indexed 2021-08-02T14:11:18Z
last_indexed 2024-11-14T12:11:38Z
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spelling 2024-10-16T10:22:55.3359350 v2 57309 2021-07-12 Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier 9e91512a54d5aee66cd77851a96ba747 0000-0003-3778-8746 Oskar Sandberg Oskar Sandberg true false 22b270622d739d81e131bec7a819e2fd Ardalan Armin Ardalan Armin true false 2021-07-12 BGPS The thermodynamic limit for the efficiency of solar cells is predominantly defined by the energy band gap of the used semiconductor. In the case of organic solar cells, both energetics and kinetics of three different species play a role: excitons, charge transfer (CT) states, and charge-separated states. In this work, we clarify the effect of the relative energetics and kinetics of these species. Making use of detailed balance, we develop an analytical framework describing how the intricate interplay between the different species influences the photocurrent generation, recombination, and open-circuit voltage in organic solar cells. We clarify the essential requirements for equilibrium among excitons, CT states, and charge carriers to occur. Furthermore, we find that the photovoltaic parameters are determined not only by the relative energetics between the different states but also by the kinetic rate constants, highlighting the importance of slow exciton recombination at low energetic offsets. Finally, depending on the kinetic parameters, we find an optimal power conversion efficiency exceeding 20% at energetic offsets around 0.1 eV. These findings provide vital insights into the operation of state-of-art non-fullerene organic solar cells with low offsets. Journal Article The Journal of Physical Chemistry C 125 28 15590 15598 American Chemical Society (ACS) 1932-7447 1932-7455 Carrier Dynamics, Electrical Connectivity, Equilibrium, Excitons, Recombination 22 7 2021 2021-07-22 10.1021/acs.jpcc.1c03656 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University External research funder(s) paid the OA fee (includes OA grants disbursed by the Library) This work was funded by the Welsh Government’s Sêr Cymru II Program through the European Regional Development Fund and Welsh European Funding Office. A.A. is a Rising Star Fellow also funded by the Welsh Government’s Sêr Cymru II Program through the European Regional Development Fund, Welsh European Funding Office, and Swansea University Strategic Initiative in Sustainable Advanced Materials. This work was also funded by UKRI through the EPSRC Program Grant EP/T028511/1 Application Targeted Integrated Photovoltaics. The authors thank Dieter Neher and Koen Vandewal for fruitful discussions. 2024-10-16T10:22:55.3359350 2021-07-12T14:42:23.0622341 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Oskar Sandberg 0000-0003-3778-8746 1 Ardalan Armin 2 57309__20515__c8bf2723da6b432a9bde086d50b335e0.pdf 57309.pdf 2021-08-02T15:09:57.0430903 Output 1872041 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 4.0 International (CC BY 4.0) License true eng https://creativecommons.org/licenses/by/4.0/
title Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier
spellingShingle Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier
Oskar Sandberg
Ardalan Armin
title_short Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier
title_full Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier
title_fullStr Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier
title_full_unstemmed Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier
title_sort Energetics and Kinetics Requirements for Organic Solar Cells to Break the 20% Power Conversion Efficiency Barrier
author_id_str_mv 9e91512a54d5aee66cd77851a96ba747
22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv 9e91512a54d5aee66cd77851a96ba747_***_Oskar Sandberg
22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
author Oskar Sandberg
Ardalan Armin
author2 Oskar Sandberg
Ardalan Armin
format Journal article
container_title The Journal of Physical Chemistry C
container_volume 125
container_issue 28
container_start_page 15590
publishDate 2021
institution Swansea University
issn 1932-7447
1932-7455
doi_str_mv 10.1021/acs.jpcc.1c03656
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 The thermodynamic limit for the efficiency of solar cells is predominantly defined by the energy band gap of the used semiconductor. In the case of organic solar cells, both energetics and kinetics of three different species play a role: excitons, charge transfer (CT) states, and charge-separated states. In this work, we clarify the effect of the relative energetics and kinetics of these species. Making use of detailed balance, we develop an analytical framework describing how the intricate interplay between the different species influences the photocurrent generation, recombination, and open-circuit voltage in organic solar cells. We clarify the essential requirements for equilibrium among excitons, CT states, and charge carriers to occur. Furthermore, we find that the photovoltaic parameters are determined not only by the relative energetics between the different states but also by the kinetic rate constants, highlighting the importance of slow exciton recombination at low energetic offsets. Finally, depending on the kinetic parameters, we find an optimal power conversion efficiency exceeding 20% at energetic offsets around 0.1 eV. These findings provide vital insights into the operation of state-of-art non-fullerene organic solar cells with low offsets.
published_date 2021-07-22T08:03:03Z
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