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Article: A 16.4% efficiency organic photovoltaic cell enabled using two donor polymers with their side-chains oriented differently by a ternary strategy

TitleA 16.4% efficiency organic photovoltaic cell enabled using two donor polymers with their side-chains oriented differently by a ternary strategy
Authors
Issue Date2020
Citation
Journal of Materials Chemistry A, 2020, v. 8, n. 7, p. 3676-3685 How to Cite?
Abstract© 2020 The Royal Society of Chemistry. Effective ternary material systems are usually achieved using a donor/acceptor guest that is structurally similar to the donor/acceptor host to maintain the film-morphology of the host binary blend. In this study, we report an unprecedented ternary material system, PBDB-TF:PBDB-T-SF:Y6, in which PBDB-T-SF is selected as the donor polymer guest of the PBDB-TF:Y6 binary blend. The absorption spectra of both polymers are almost overlapped and their energy levels are similar. However, the side-chains between the host (PBDB-TF) and the guest (PBDB-T-SF) are oriented differently, which modulates the morphology of the polymer phases from nanoscale (10-20 nm) fine fibrils in the host binary blend to an interpenetrating mesoscale polymer-crowd (>100 nm) with reduced phase crystallinity in the ternary blend. As a result, the electrical properties of the active layer are greatly improved: the hole mobility increases more than the electron mobility, resulting in balanced hole and electron mobilities; the monomolecular and bimolecular recombinations are both reduced; the charge carrier extraction is faster and the trap-assisted recombination is reduced, resulting in a longer recombination lifetime of charge carriers (0.19 μs vs. 0.15/0.11 μs). All of these contribute to the concurrently increased device fill-factor and short-circuit current-density, and finally improved efficiency (16.4%). Solid-state 19F magic angle spinning nuclear magnetic microscopy is conducted to probe interaction between the host and guest donor polymers. This study demonstrates that mesoscale morphology such as the polymer-crowd induced by differently oriented side chains of the host-guest polymers can be a morphological feature of active layer toward high-efficiency organic photovoltaic cells.
Persistent Identifierhttp://hdl.handle.net/10722/285861
ISSN
2023 Impact Factor: 10.7
2023 SCImago Journal Rankings: 2.804
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChang, Yuan-
dc.contributor.authorLau, Tsz Ki-
dc.contributor.authorChow, Philip C.Y.-
dc.contributor.authorWu, Ningning-
dc.contributor.authorSu, Dan-
dc.contributor.authorZhang, Weichao-
dc.contributor.authorMeng, Huifeng-
dc.contributor.authorMa, Chao-
dc.contributor.authorLiu, Tao-
dc.contributor.authorLi, Kun-
dc.contributor.authorZou, Xinhui-
dc.contributor.authorWong, Kam Sing-
dc.contributor.authorLu, Xinhui-
dc.contributor.authorYan, He-
dc.contributor.authorZhan, Chuanlang-
dc.date.accessioned2020-08-18T04:56:50Z-
dc.date.available2020-08-18T04:56:50Z-
dc.date.issued2020-
dc.identifier.citationJournal of Materials Chemistry A, 2020, v. 8, n. 7, p. 3676-3685-
dc.identifier.issn2050-7488-
dc.identifier.urihttp://hdl.handle.net/10722/285861-
dc.description.abstract© 2020 The Royal Society of Chemistry. Effective ternary material systems are usually achieved using a donor/acceptor guest that is structurally similar to the donor/acceptor host to maintain the film-morphology of the host binary blend. In this study, we report an unprecedented ternary material system, PBDB-TF:PBDB-T-SF:Y6, in which PBDB-T-SF is selected as the donor polymer guest of the PBDB-TF:Y6 binary blend. The absorption spectra of both polymers are almost overlapped and their energy levels are similar. However, the side-chains between the host (PBDB-TF) and the guest (PBDB-T-SF) are oriented differently, which modulates the morphology of the polymer phases from nanoscale (10-20 nm) fine fibrils in the host binary blend to an interpenetrating mesoscale polymer-crowd (>100 nm) with reduced phase crystallinity in the ternary blend. As a result, the electrical properties of the active layer are greatly improved: the hole mobility increases more than the electron mobility, resulting in balanced hole and electron mobilities; the monomolecular and bimolecular recombinations are both reduced; the charge carrier extraction is faster and the trap-assisted recombination is reduced, resulting in a longer recombination lifetime of charge carriers (0.19 μs vs. 0.15/0.11 μs). All of these contribute to the concurrently increased device fill-factor and short-circuit current-density, and finally improved efficiency (16.4%). Solid-state 19F magic angle spinning nuclear magnetic microscopy is conducted to probe interaction between the host and guest donor polymers. This study demonstrates that mesoscale morphology such as the polymer-crowd induced by differently oriented side chains of the host-guest polymers can be a morphological feature of active layer toward high-efficiency organic photovoltaic cells.-
dc.languageeng-
dc.relation.ispartofJournal of Materials Chemistry A-
dc.titleA 16.4% efficiency organic photovoltaic cell enabled using two donor polymers with their side-chains oriented differently by a ternary strategy-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/c9ta13293g-
dc.identifier.scopuseid_2-s2.0-85081109378-
dc.identifier.volume8-
dc.identifier.issue7-
dc.identifier.spage3676-
dc.identifier.epage3685-
dc.identifier.eissn2050-7496-
dc.identifier.isiWOS:000521346600012-
dc.identifier.issnl2050-7496-

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