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Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells

Mengxue Chen, Dan Liu, Wei Li, Robert S. Gurney, Donghui Li, Jinlong Cai, Emma L. K. Spooner, Rachel C. Kilbride, James D. McGettrick, Trystan Watson Orcid Logo, Zhe Li, Richard A. L. Jones, David G. Lidzey, Tao Wang

ACS Applied Materials & Interfaces, Volume: 11, Issue: 29, Pages: 26194 - 26203

Swansea University Author: Trystan Watson Orcid Logo

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DOI (Published version): 10.1021/acsami.9b07317

Abstract

Fluorination of conjugated molecules has been established as an effective structural modification strategy to influence properties and has attracted extensive attention in organic solar cells (OSCs). Here, we have investigated optoelectronic and photovoltaic property changes of OSCs made of polymer...

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Published in: ACS Applied Materials & Interfaces
ISSN: 1944-8244 1944-8252
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51386
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Here, we have investigated optoelectronic and photovoltaic property changes of OSCs made of polymer donors with the non-fullerene acceptors (NFAs) ITIC and IEICO and their fluorinated counterparts IT-4F and IEICO-4F. Device studies show that fluorinated NFAs lead to reduced Voc but increased Jsc and fill-factor (FF), and therefore, the ultimate influence to efficiency depends on the compensation of Voc loss and gains of Jsc and FF. Fluorination lowers energy levels of NFAs, reduces their electronic band gaps, and red-shifts the absorption spectra. The impact of fluorination on the molecular order depends on the specific NFA, and the conversion of ITIC to IT-4F reduces the structural order, which can be reversed after blending with the donor PBDB-T. Contrastingly, IEICO-4F presents stronger &#x3C0;&#x2013;&#x3C0; stacking after fluorination from IEICO, and this is further strengthened after blending with the donor PTB7-Th. The photovoltaic blends universally present a donor-rich surface region which can promote charge transport and collection toward the anode in inverted OSCs. 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spelling 2019-09-24T12:09:42.3293310 v2 51386 2019-08-13 Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells a210327b52472cfe8df9b8108d661457 0000-0002-8015-1436 Trystan Watson Trystan Watson true false 2019-08-13 MTLS Fluorination of conjugated molecules has been established as an effective structural modification strategy to influence properties and has attracted extensive attention in organic solar cells (OSCs). Here, we have investigated optoelectronic and photovoltaic property changes of OSCs made of polymer donors with the non-fullerene acceptors (NFAs) ITIC and IEICO and their fluorinated counterparts IT-4F and IEICO-4F. Device studies show that fluorinated NFAs lead to reduced Voc but increased Jsc and fill-factor (FF), and therefore, the ultimate influence to efficiency depends on the compensation of Voc loss and gains of Jsc and FF. Fluorination lowers energy levels of NFAs, reduces their electronic band gaps, and red-shifts the absorption spectra. The impact of fluorination on the molecular order depends on the specific NFA, and the conversion of ITIC to IT-4F reduces the structural order, which can be reversed after blending with the donor PBDB-T. Contrastingly, IEICO-4F presents stronger π–π stacking after fluorination from IEICO, and this is further strengthened after blending with the donor PTB7-Th. The photovoltaic blends universally present a donor-rich surface region which can promote charge transport and collection toward the anode in inverted OSCs. The fluorination of NFAs, however, reduces the fraction of donors in this donor-rich region, consequently encouraging the intermixing of donor/acceptor for efficient charge generation. Journal Article ACS Applied Materials & Interfaces 11 29 26194 26203 1944-8244 1944-8252 organic solar cells, non-fullerene acceptors, fluorination, three-dimensional morphology, photovoltaic properties 24 7 2019 2019-07-24 10.1021/acsami.9b07317 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-09-24T12:09:42.3293310 2019-08-13T09:11:03.0964011 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Mengxue Chen 1 Dan Liu 2 Wei Li 3 Robert S. Gurney 4 Donghui Li 5 Jinlong Cai 6 Emma L. K. Spooner 7 Rachel C. Kilbride 8 James D. McGettrick 9 Trystan Watson 0000-0002-8015-1436 10 Zhe Li 11 Richard A. L. Jones 12 David G. Lidzey 13 Tao Wang 14 0051386-24092019120801.pdf chen2019(3).pdf 2019-09-24T12:08:01.3200000 Output 1971657 application/pdf Accepted Manuscript true 2020-06-26T00:00:00.0000000 true eng 0051386-24092019120845.pdf chen2019(3)SI.pdf 2019-09-24T12:08:45.8930000 Output 1266692 application/pdf Accepted Manuscript true 2020-06-26T00:00:00.0000000 true eng
title Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells
spellingShingle Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells
Trystan Watson
title_short Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells
title_full Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells
title_fullStr Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells
title_full_unstemmed Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells
title_sort Influences of Non-fullerene Acceptor Fluorination on Three-Dimensional Morphology and Photovoltaic Properties of Organic Solar Cells
author_id_str_mv a210327b52472cfe8df9b8108d661457
author_id_fullname_str_mv a210327b52472cfe8df9b8108d661457_***_Trystan Watson
author Trystan Watson
author2 Mengxue Chen
Dan Liu
Wei Li
Robert S. Gurney
Donghui Li
Jinlong Cai
Emma L. K. Spooner
Rachel C. Kilbride
James D. McGettrick
Trystan Watson
Zhe Li
Richard A. L. Jones
David G. Lidzey
Tao Wang
format Journal article
container_title ACS Applied Materials & Interfaces
container_volume 11
container_issue 29
container_start_page 26194
publishDate 2019
institution Swansea University
issn 1944-8244
1944-8252
doi_str_mv 10.1021/acsami.9b07317
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 Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description Fluorination of conjugated molecules has been established as an effective structural modification strategy to influence properties and has attracted extensive attention in organic solar cells (OSCs). Here, we have investigated optoelectronic and photovoltaic property changes of OSCs made of polymer donors with the non-fullerene acceptors (NFAs) ITIC and IEICO and their fluorinated counterparts IT-4F and IEICO-4F. Device studies show that fluorinated NFAs lead to reduced Voc but increased Jsc and fill-factor (FF), and therefore, the ultimate influence to efficiency depends on the compensation of Voc loss and gains of Jsc and FF. Fluorination lowers energy levels of NFAs, reduces their electronic band gaps, and red-shifts the absorption spectra. The impact of fluorination on the molecular order depends on the specific NFA, and the conversion of ITIC to IT-4F reduces the structural order, which can be reversed after blending with the donor PBDB-T. Contrastingly, IEICO-4F presents stronger π–π stacking after fluorination from IEICO, and this is further strengthened after blending with the donor PTB7-Th. The photovoltaic blends universally present a donor-rich surface region which can promote charge transport and collection toward the anode in inverted OSCs. The fluorination of NFAs, however, reduces the fraction of donors in this donor-rich region, consequently encouraging the intermixing of donor/acceptor for efficient charge generation.
published_date 2019-07-24T04:03:15Z
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score 11.0133505

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