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Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells

Zeinab Hamid, Andrew Wadsworth, Elham Rezasoltani, Sarah Holliday, Mohammed Azzouzi, Marios Neophytou, Anne A. Y. Guilbert, Yifan Dong, Mark S. Little, Subhrangsu Mukherjee, Andrew A. Herzing, Helen Bristow, R. Joseph Kline, Dean M. DeLongchamp, Artem A. Bakulin, James Durrant Orcid Logo, Jenny Nelson, Iain McCulloch

Advanced Energy Materials, Volume: 10, Issue: 8, Start page: 1903248

Swansea University Author: James Durrant Orcid Logo

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DOI (Published version): 10.1002/aenm.201903248

Abstract

The temperature‐dependent aggregation behavior of PffBT4T polymers used in organic solar cells plays a critical role in the formation of a favorable morphology in fullerene‐based devices. However, there is little investigation into the impact of donor/acceptor ratio on morphology tuning, especially...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: Wiley 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53486
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spelling 2020-07-03T19:10:33.9802915 v2 53486 2020-02-10 Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2020-02-10 MTLS The temperature‐dependent aggregation behavior of PffBT4T polymers used in organic solar cells plays a critical role in the formation of a favorable morphology in fullerene‐based devices. However, there is little investigation into the impact of donor/acceptor ratio on morphology tuning, especially for nonfullerene acceptors (NFAs). Herein, the influence of composition on morphology is reported for blends of PffBT4T‐2DT with two NFAs, O‐IDTBR and O‐IDFBR. The monotectic phase behavior inferred from differential scanning calorimetry provides qualitative insight into the interplay between solid–liquid and liquid–liquid demixing. Transient absorption spectroscopy suggests that geminate recombination dominates charge decay and that the decay rate is insensitive to composition, corroborated by negligible changes in open‐circuit voltage. Exciton lifetimes are also insensitive to composition, which is attributed to the signal being dominated by acceptor excitons which are formed and decay in domains of similar size and purity irrespective of composition. A hierarchical morphology is observed, where the composition dependence of size scales and scattering intensity from resonant soft X‐ray scattering (R‐SoXS) is dominated by variations in volume fractions of polymer/polymer‐rich domains. Results suggest an optimal morphology where polymer crystallite size and connectivity are balanced, ensuring a high probability of hole extraction via such domains. Journal Article Advanced Energy Materials 10 8 1903248 Wiley 1614-6832 1614-6840 calorimetry; morphology; nonfullerene; organic photovoltaics; phase behavior 24 2 2020 2020-02-24 10.1002/aenm.201903248 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-07-03T19:10:33.9802915 2020-02-10T13:11:09.7744447 Zeinab Hamid 1 Andrew Wadsworth 2 Elham Rezasoltani 3 Sarah Holliday 4 Mohammed Azzouzi 5 Marios Neophytou 6 Anne A. Y. Guilbert 7 Yifan Dong 8 Mark S. Little 9 Subhrangsu Mukherjee 10 Andrew A. Herzing 11 Helen Bristow 12 R. Joseph Kline 13 Dean M. DeLongchamp 14 Artem A. Bakulin 15 James Durrant 0000-0001-8353-7345 16 Jenny Nelson 17 Iain McCulloch 18
title Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells
spellingShingle Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells
James Durrant
title_short Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells
title_full Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells
title_fullStr Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells
title_full_unstemmed Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells
title_sort Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T‐2DT/Nonfullerene Organic Solar Cells
author_id_str_mv f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author James Durrant
author2 Zeinab Hamid
Andrew Wadsworth
Elham Rezasoltani
Sarah Holliday
Mohammed Azzouzi
Marios Neophytou
Anne A. Y. Guilbert
Yifan Dong
Mark S. Little
Subhrangsu Mukherjee
Andrew A. Herzing
Helen Bristow
R. Joseph Kline
Dean M. DeLongchamp
Artem A. Bakulin
James Durrant
Jenny Nelson
Iain McCulloch
format Journal article
container_title Advanced Energy Materials
container_volume 10
container_issue 8
container_start_page 1903248
publishDate 2020
institution Swansea University
issn 1614-6832
1614-6840
doi_str_mv 10.1002/aenm.201903248
publisher Wiley
document_store_str 0
active_str 0
description The temperature‐dependent aggregation behavior of PffBT4T polymers used in organic solar cells plays a critical role in the formation of a favorable morphology in fullerene‐based devices. However, there is little investigation into the impact of donor/acceptor ratio on morphology tuning, especially for nonfullerene acceptors (NFAs). Herein, the influence of composition on morphology is reported for blends of PffBT4T‐2DT with two NFAs, O‐IDTBR and O‐IDFBR. The monotectic phase behavior inferred from differential scanning calorimetry provides qualitative insight into the interplay between solid–liquid and liquid–liquid demixing. Transient absorption spectroscopy suggests that geminate recombination dominates charge decay and that the decay rate is insensitive to composition, corroborated by negligible changes in open‐circuit voltage. Exciton lifetimes are also insensitive to composition, which is attributed to the signal being dominated by acceptor excitons which are formed and decay in domains of similar size and purity irrespective of composition. A hierarchical morphology is observed, where the composition dependence of size scales and scattering intensity from resonant soft X‐ray scattering (R‐SoXS) is dominated by variations in volume fractions of polymer/polymer‐rich domains. Results suggest an optimal morphology where polymer crystallite size and connectivity are balanced, ensuring a high probability of hole extraction via such domains.
published_date 2020-02-24T04:06:26Z
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score 11.028798

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