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Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages

Lorena Perdigón‐Toro Orcid Logo, Le Quang Phuong, Fabian Eller, Guillaume Freychet, Elifnaz Saglamkaya, Jafar I. Khan, Qingya Wei, Stefan Zeiske, Daniel Kroh, Stefan Wedler, Anna Köhler, Ardalan Armin Orcid Logo, Frédéric Laquai, Eva M. Herzig, Yingping Zou, Safa Shoaee, Dieter Neher Orcid Logo

Advanced Energy Materials, Volume: 12, Issue: 12, Start page: 2103422

Swansea University Authors: Stefan Zeiske, Ardalan Armin Orcid Logo

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DOI (Published version): 10.1002/aenm.202103422

Abstract

Non-fullerene acceptors (NFAs) as used in state-of-the-art organic solar cells feature highly crystalline layers that go along with low energetic disorder. Here, the crucial role of energetic disorder in blends of the donor polymer PM6 with two Y-series NFAs, Y6, and N4 is studied. By performing tem...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: Wiley 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa59315
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spelling 2022-04-08T13:07:08.9161558 v2 59315 2022-02-07 Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages 0c9c5b89df9ac882c3e09dd1a9f28fc5 Stefan Zeiske Stefan Zeiske true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2022-02-07 SPH Non-fullerene acceptors (NFAs) as used in state-of-the-art organic solar cells feature highly crystalline layers that go along with low energetic disorder. Here, the crucial role of energetic disorder in blends of the donor polymer PM6 with two Y-series NFAs, Y6, and N4 is studied. By performing temperature-dependent charge transport and recombination studies, a consistent picture of the shape of the density of state distributions for free charges in the two blends is developed, allowing an analytical description of the dependence of the open-circuit voltage VOC on temperature and illumination intensity. Disorder is found to influence the value of the VOC at room temperature, but also its progression with temperature. Here, the PM6:Y6 blend benefits substantially from its narrower state distributions. The analysis also shows that the energy of the equilibrated free charge population is well below the energy of the NFA singlet excitons for both blends and possibly below the energy of the populated charge transfer manifold, indicating a down-hill driving force for free charge formation. It is concluded that energetic disorder of charge-separated states has to be considered in the analysis of the photovoltaic properties, even for the more ordered PM6:Y6 blend. Journal Article Advanced Energy Materials 12 12 2103422 Wiley 1614-6832 1614-6840 energetic disorder; non-fullerene acceptors; open-circuit voltage; organic solar cells 24 3 2022 2022-03-24 10.1002/aenm.202103422 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University Other Deutsche Forschungsgemeinschaft; German Research Foundation. Grant Numbers: 450968074, 182087777 – SFB 951, 3923306670; SolarEraNet. Grant Number: NFA4R2ROPV; Elite Network of Bavaria; Soft Matter Interfaces Beamline; U.S. Department of Energy; Brookhaven National Laboratory. Grant Number: DE-SC0012704; King Abdullah University of Science and Technology; Office of Sponsored Research. Grant Number: OSR-CARF/CCF-3079; National Natural Science Foundation of China. Grant Number: 52125306; European Regional Development Fund; Welsh European Funding Office; Swansea University Strategic Initiative in Sustainable Advanced Materials; Office of Science. Grant Number: DE-SC0012704; Open access funding enabled and organized by Projekt DEAL. 2022-04-08T13:07:08.9161558 2022-02-07T15:52:42.1119916 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Lorena Perdigón‐Toro 0000-0002-0957-2027 1 Le Quang Phuong 2 Fabian Eller 3 Guillaume Freychet 4 Elifnaz Saglamkaya 5 Jafar I. Khan 6 Qingya Wei 7 Stefan Zeiske 8 Daniel Kroh 9 Stefan Wedler 10 Anna Köhler 11 Ardalan Armin 0000-0002-6129-5354 12 Frédéric Laquai 13 Eva M. Herzig 14 Yingping Zou 15 Safa Shoaee 16 Dieter Neher 0000-0001-6618-8403 17 59315__22396__381d8b08b0fd4839ae68695b17256ef5.pdf 59315.pdf 2022-02-17T12:23:35.0025245 Output 2075205 application/pdf Version of Record true © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License true eng http://creativecommons.org/licenses/by/4.0/
title Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages
spellingShingle Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages
Stefan Zeiske
Ardalan Armin
title_short Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages
title_full Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages
title_fullStr Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages
title_full_unstemmed Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages
title_sort Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages
author_id_str_mv 0c9c5b89df9ac882c3e09dd1a9f28fc5
22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv 0c9c5b89df9ac882c3e09dd1a9f28fc5_***_Stefan Zeiske
22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
author Stefan Zeiske
Ardalan Armin
author2 Lorena Perdigón‐Toro
Le Quang Phuong
Fabian Eller
Guillaume Freychet
Elifnaz Saglamkaya
Jafar I. Khan
Qingya Wei
Stefan Zeiske
Daniel Kroh
Stefan Wedler
Anna Köhler
Ardalan Armin
Frédéric Laquai
Eva M. Herzig
Yingping Zou
Safa Shoaee
Dieter Neher
format Journal article
container_title Advanced Energy Materials
container_volume 12
container_issue 12
container_start_page 2103422
publishDate 2022
institution Swansea University
issn 1614-6832
1614-6840
doi_str_mv 10.1002/aenm.202103422
publisher Wiley
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 Non-fullerene acceptors (NFAs) as used in state-of-the-art organic solar cells feature highly crystalline layers that go along with low energetic disorder. Here, the crucial role of energetic disorder in blends of the donor polymer PM6 with two Y-series NFAs, Y6, and N4 is studied. By performing temperature-dependent charge transport and recombination studies, a consistent picture of the shape of the density of state distributions for free charges in the two blends is developed, allowing an analytical description of the dependence of the open-circuit voltage VOC on temperature and illumination intensity. Disorder is found to influence the value of the VOC at room temperature, but also its progression with temperature. Here, the PM6:Y6 blend benefits substantially from its narrower state distributions. The analysis also shows that the energy of the equilibrated free charge population is well below the energy of the NFA singlet excitons for both blends and possibly below the energy of the populated charge transfer manifold, indicating a down-hill driving force for free charge formation. It is concluded that energetic disorder of charge-separated states has to be considered in the analysis of the photovoltaic properties, even for the more ordered PM6:Y6 blend.
published_date 2022-03-24T04:16:31Z
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score 11.037603

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