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dc.contributor.authorZhang, Jiangbin
dc.contributor.authorGu, Qinying
dc.contributor.authorThu, Trang Do
dc.contributor.authorRundel, Kira
dc.contributor.authorSonar, Prashant
dc.contributor.authorFriend, Richard H
dc.contributor.authorMcNeil, Christopher R
dc.contributor.authorBakulin, Artem A
dc.date.accessioned2019-07-04T12:34:05Z
dc.date.available2019-07-04T12:34:05Z
dc.date.issued2018
dc.identifier.issn1089-5639
dc.identifier.doi10.1021/acsjpca.7b11891
dc.identifier.urihttp://hdl.handle.net/10072/385182
dc.description.abstractHerein, we report on the charge dynamics of photovoltaic devices based on two novel small-molecule nonfullerene acceptors featuring a central ketone unit. Using ultrafast near-infrared spectroscopy with optical and photocurrent detection methods, we identify one of the key loss channels in the devices as geminate recombination (GR) of interfacial charge transfer states (CTSs). We find that the magnitude of GR is highly sensitive to the choice of solvent and annealing conditions. Interestingly, regardless of these processing conditions, the same lifetime for GR (∼130 ps) is obtained by both detection methods upon decomposing the complex broadband transient optical spectra, suggesting this time scale is inherent and independent of morphology. These observations suggest that the CTSs in the studied material blends are mostly strongly bound, and that charge generation from these states is highly inefficient. We further rationalize our results by considering the impact of the processing on the morphology of the mixed donor and acceptor domains and discuss the potential consequences of the early charge dynamics on the performance of emerging nonfullerene photovoltaic devices. Our results demonstrate that careful choice of processing conditions enables enhanced exciton harvesting and suppression of GR by more than 3 orders of magnitude.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAMER CHEMICAL SOC
dc.relation.ispartofpagefrom1253
dc.relation.ispartofpageto1260
dc.relation.ispartofissue5
dc.relation.ispartofjournalJOURNAL OF PHYSICAL CHEMISTRY A
dc.relation.ispartofvolume122
dc.subject.fieldofresearchPhysical chemistry
dc.subject.fieldofresearchTheoretical and computational chemistry
dc.subject.fieldofresearchcode3406
dc.subject.fieldofresearchcode3407
dc.titleControl of Geminate Recombination by the Material Composition and Processing Conditions in Novel Polymer: Nonfullerene Acceptor Photovoltaic Devices
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dc.description.versionAccepted Manuscript (AM)
gro.rights.copyrightThis document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry A, copyright 2018 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acs.jpca.7b11891
gro.hasfulltextFull Text
gro.griffith.authorSonar, Prashant


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