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Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization

Him Cheng Wong, Zhe Li Orcid Logo, Ching Hong Tan, Hongliang Zhong, Zhenggang Huang, Hugo Bronstein, Iain McCulloch, João T. Cabral, James R. Durrant

ACS Nano, Volume: 8, Issue: 2, Pages: 1297 - 1308

Swansea University Author: Zhe Li Orcid Logo

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DOI (Published version): 10.1021/nn404687s

Abstract

We report a general light processing strategy for organic solar cells (OSC) that exploits the propensity of the fullerene derivative PC60BM to photo-oligomerize, which is capable of both stabilizing the polymer:PC60BM active layer morphology and enhancing the device stability under thermal annealing...

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Published in: ACS Nano
ISSN: 1936-0851 1936-086X
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa32085
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spelling 2017-07-11T09:16:08.0556398 v2 32085 2017-02-23 Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization 56be57cc8dd661dfdbb921608cf93ded 0000-0002-7404-7448 Zhe Li Zhe Li true false 2017-02-23 EEN We report a general light processing strategy for organic solar cells (OSC) that exploits the propensity of the fullerene derivative PC60BM to photo-oligomerize, which is capable of both stabilizing the polymer:PC60BM active layer morphology and enhancing the device stability under thermal annealing. The observations hold for blends of PC60BM with an array of benchmark donor polymer systems, including P3HT, DPP-TT-T, PTB7, and PCDTBT. The morphology and kinetics of the thermally induced PC60BM crystallization within the blend films are investigated as a function of substrate and temperature. PC60BM nucleation rates on SiOx substrates exhibit a pronounced peak profile with temperature, whose maximum is polymer and blend-composition dependent. Modest illumination (<10 mW/cm2) significantly suppresses nucleation, which is quantified as function of dose, but does not affect crystalline shape or growth, in the micrometer range. On PEDOT:PSS substrates, thermally induced PC60BM aggregation is observed on smaller (≈100 nm) length scales, depending upon donor polymer, and also suppressed by light exposure. The concurrent thermal dissociation process of PC60BM oligomers in blend films is also investigated and the activation energy of the fullerene–fullerene bond is estimated to be 0.96 ± 0.04 eV. Following light processing, the thermal stability, and thus lifetime, of PCDTBT:PC60BM devices increases for annealing times up to 150 h. In contrast, PCDTBT:PC70BM OSCs are found to be largely light insensitive. The results are rationalized in terms of the suppression of PC60BM micro- and nanoscopic crystallization processes upon thermal annealing caused by photoinduced PC60BM oligomerization. Journal Article ACS Nano 8 2 1297 1308 1936-0851 1936-086X organic solar cells; PC60BM crystallization; PCBM photo-oligomerization; solar cell thermal stability and lifetime 31 12 2014 2014-12-31 10.1021/nn404687s COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-07-11T09:16:08.0556398 2017-02-23T16:16:01.1953104 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Him Cheng Wong 1 Zhe Li 0000-0002-7404-7448 2 Ching Hong Tan 3 Hongliang Zhong 4 Zhenggang Huang 5 Hugo Bronstein 6 Iain McCulloch 7 João T. Cabral 8 James R. Durrant 9
title Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
spellingShingle Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
Zhe Li
title_short Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
title_full Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
title_fullStr Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
title_full_unstemmed Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
title_sort Morphological Stability and Performance of Polymer–Fullerene Solar Cells under Thermal Stress: The Impact of Photoinduced PC60BM Oligomerization
author_id_str_mv 56be57cc8dd661dfdbb921608cf93ded
author_id_fullname_str_mv 56be57cc8dd661dfdbb921608cf93ded_***_Zhe Li
author Zhe Li
author2 Him Cheng Wong
Zhe Li
Ching Hong Tan
Hongliang Zhong
Zhenggang Huang
Hugo Bronstein
Iain McCulloch
João T. Cabral
James R. Durrant
format Journal article
container_title ACS Nano
container_volume 8
container_issue 2
container_start_page 1297
publishDate 2014
institution Swansea University
issn 1936-0851
1936-086X
doi_str_mv 10.1021/nn404687s
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
active_str 0
description We report a general light processing strategy for organic solar cells (OSC) that exploits the propensity of the fullerene derivative PC60BM to photo-oligomerize, which is capable of both stabilizing the polymer:PC60BM active layer morphology and enhancing the device stability under thermal annealing. The observations hold for blends of PC60BM with an array of benchmark donor polymer systems, including P3HT, DPP-TT-T, PTB7, and PCDTBT. The morphology and kinetics of the thermally induced PC60BM crystallization within the blend films are investigated as a function of substrate and temperature. PC60BM nucleation rates on SiOx substrates exhibit a pronounced peak profile with temperature, whose maximum is polymer and blend-composition dependent. Modest illumination (<10 mW/cm2) significantly suppresses nucleation, which is quantified as function of dose, but does not affect crystalline shape or growth, in the micrometer range. On PEDOT:PSS substrates, thermally induced PC60BM aggregation is observed on smaller (≈100 nm) length scales, depending upon donor polymer, and also suppressed by light exposure. The concurrent thermal dissociation process of PC60BM oligomers in blend films is also investigated and the activation energy of the fullerene–fullerene bond is estimated to be 0.96 ± 0.04 eV. Following light processing, the thermal stability, and thus lifetime, of PCDTBT:PC60BM devices increases for annealing times up to 150 h. In contrast, PCDTBT:PC70BM OSCs are found to be largely light insensitive. The results are rationalized in terms of the suppression of PC60BM micro- and nanoscopic crystallization processes upon thermal annealing caused by photoinduced PC60BM oligomerization.
published_date 2014-12-31T03:39:16Z
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score 11.036006

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