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dc.contributor.authorDimitrov, Stoichko D.
dc.contributor.authorWheeler, Scot
dc.contributor.authorNiedzialek, Dorota
dc.contributor.authorSchroeder, Bob C.
dc.contributor.authorUtzat, Hendrik
dc.contributor.authorFrost, Jarvist M.
dc.contributor.authorYao, Jizhong
dc.contributor.authorGillett, Alexander
dc.contributor.authorTuladhar, Pabitra S.
dc.contributor.authorMcCulloch, Iain
dc.contributor.authorNelson, Jenny
dc.contributor.authorDurrant, James R.
dc.date.accessioned2015-03-16T05:11:31Z
dc.date.available2015-03-16T05:11:31Z
dc.date.issued2015-03-04
dc.identifier.citationPolaron pair mediated triplet generation in polymer/fullerene blends 2015, 6:6501 Nature Communications
dc.identifier.issn2041-1723
dc.identifier.pmid25735188
dc.identifier.doi10.1038/ncomms7501
dc.identifier.urihttp://hdl.handle.net/10754/346697
dc.description.abstractElectron spin is a key consideration for the function of organic semiconductors in light-emitting diodes and solar cells, as well as spintronic applications relying on organic magnetoresistance. A mechanism for triplet excited state generation in such systems is by recombination of electron-hole pairs. However, the exact charge recombination mechanism, whether geminate or nongeminate and whether it involves spin-state mixing is not well understood. In this work, the dynamics of free charge separation competing with recombination to polymer triplet states is studied in two closely related polymer-fullerene blends with differing polymer fluorination and photovoltaic performance. Using time-resolved laser spectroscopic techniques and quantum chemical calculations, we show that lower charge separation in the fluorinated system is associated with the formation of bound electron-hole pairs, which undergo spin-state mixing on the nanosecond timescale and subsequent geminate recombination to triplet excitons. We find that these bound electron-hole pairs can be dissociated by electric fields.
dc.publisherSpringer Nature
dc.relation.urlhttp://www.nature.com/doifinder/10.1038/ncomms7501
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
dc.titlePolaron pair mediated triplet generation in polymer/fullerene blends
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalNature Communications
dc.identifier.pmcidPMC4366531
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionDepartment of Chemistry, Centre for Plastic Electronics, Imperial College London
dc.contributor.institutionDepartment of Physics, Centre for Plastic Electronics, Imperial College London
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personMcCulloch, Iain
refterms.dateFOA2018-06-14T04:43:16Z
dc.date.published-online2015-03-04
dc.date.published-print2015-12


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