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Article: Donor Polymer Can Assist Electron Transport in Bulk Heterojunction Blends with Small Energetic Offsets

TitleDonor Polymer Can Assist Electron Transport in Bulk Heterojunction Blends with Small Energetic Offsets
Authors
Keywordsorganic solar cells
low driving force
topology
intrinsic mobility in donors
electron mobility
Issue Date2019
Citation
Advanced Materials, 2019, v. 31, n. 44, article no. 1903998 How to Cite?
Abstract© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Conventional organic solar cell (OSC) systems have significant energy offsets between the donor and acceptor both at the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels. Because of this, in a bulk heterojunction (BHJ) system, electrons typically transport in acceptors, whereas holes typically transport in donors. It is not favorable for electrons to hop back and forth between the donor and acceptor because the hopping is energetically disfavored. In such conventional OSC systems, the addition of donor polymer to acceptor films should typically reduce the electron mobility. In this study, a surprisingly large increase (up to 30×) in electron mobility is observed in an OSC blend when introducing a polymer donor into small molecular acceptor. By ruling out morphology reasons, it is shown that the donor polymer can assist the electron transport by providing “bridges” or a “shortcut” for electron transport across the domains of small molecular acceptors. This can happen because, for these systems, the LUMO offset is small. The study shows the benefits of donor-assisted electron transport in BHJ systems with small energetic offsets. This finding could be also applied to other fields to tune the optimized charge transport property of organic materials or slush blends.
Persistent Identifierhttp://hdl.handle.net/10722/285850
ISSN
2019 Impact Factor: 27.398
2015 SCImago Journal Rankings: 9.021

 

DC FieldValueLanguage
dc.contributor.authorYin, Hang-
dc.contributor.authorMa, Lik Kuen-
dc.contributor.authorWang, Yilin-
dc.contributor.authorHuang, Jiachen-
dc.contributor.authorYu, Han-
dc.contributor.authorZhang, Jianquan-
dc.contributor.authorChow, Philip C.Y.-
dc.contributor.authorMa, Wei-
dc.contributor.authorSo, Shu Kong-
dc.contributor.authorYan, He-
dc.date.accessioned2020-08-18T04:56:48Z-
dc.date.available2020-08-18T04:56:48Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Materials, 2019, v. 31, n. 44, article no. 1903998-
dc.identifier.issn0935-9648-
dc.identifier.urihttp://hdl.handle.net/10722/285850-
dc.description.abstract© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Conventional organic solar cell (OSC) systems have significant energy offsets between the donor and acceptor both at the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels. Because of this, in a bulk heterojunction (BHJ) system, electrons typically transport in acceptors, whereas holes typically transport in donors. It is not favorable for electrons to hop back and forth between the donor and acceptor because the hopping is energetically disfavored. In such conventional OSC systems, the addition of donor polymer to acceptor films should typically reduce the electron mobility. In this study, a surprisingly large increase (up to 30×) in electron mobility is observed in an OSC blend when introducing a polymer donor into small molecular acceptor. By ruling out morphology reasons, it is shown that the donor polymer can assist the electron transport by providing “bridges” or a “shortcut” for electron transport across the domains of small molecular acceptors. This can happen because, for these systems, the LUMO offset is small. The study shows the benefits of donor-assisted electron transport in BHJ systems with small energetic offsets. This finding could be also applied to other fields to tune the optimized charge transport property of organic materials or slush blends.-
dc.languageeng-
dc.relation.ispartofAdvanced Materials-
dc.subjectorganic solar cells-
dc.subjectlow driving force-
dc.subjecttopology-
dc.subjectintrinsic mobility in donors-
dc.subjectelectron mobility-
dc.titleDonor Polymer Can Assist Electron Transport in Bulk Heterojunction Blends with Small Energetic Offsets-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/adma.201903998-
dc.identifier.pmid31532874-
dc.identifier.scopuseid_2-s2.0-85073981645-
dc.identifier.volume31-
dc.identifier.issue44-
dc.identifier.spagearticle no. 1903998-
dc.identifier.epagearticle no. 1903998-
dc.identifier.eissn1521-4095-

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