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dc.contributor.authorDomingo, Ester
dc.contributor.authorVandewal, Koen
dc.contributor.authorFei, Zhuping
dc.contributor.authorWatkins, Scott E.
dc.contributor.authorScholes, Fiona H.
dc.contributor.authorBannock, James H
dc.contributor.authorde Mello, John
dc.contributor.authorRichter, Lee J.
dc.contributor.authorDeLongchamp, Dean M.
dc.contributor.authorAmassian, Aram
dc.contributor.authorHeeney, Martin
dc.contributor.authorSalleo, Alberto
dc.contributor.authorStingelin, Natalie
dc.date.accessioned2015-04-14T12:39:12Z
dc.date.available2015-04-14T12:39:12Z
dc.date.issued2015-04-09
dc.identifier.citationDirect correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy 2015:150409144253004 Journal of the American Chemical Society
dc.identifier.issn0002-7863
dc.identifier.issn1520-5126
dc.identifier.pmid25856143
dc.identifier.doi10.1021/ja512410f
dc.identifier.urihttp://hdl.handle.net/10754/550071
dc.description.abstractWe show that the Charge Transfer (CT) absorption signal in bulk-heterojunction (BHJ) solar cell blends, measured by photothermal deflection spectroscopy (PDS), is directly proportional to the density of molecular donor/acceptor interfaces. Since the optical transitions from ground state to the interfacial CT state are weakly allowed at photon energies below the optical gap of both donor and acceptor, we can exploit the use of this sensitive linear absorption spectroscopy for such quantification. Moreover, we determine the absolute molar extinction coefficient of the CT transition for an archetypical polymer-fullerene interface. The latter is ~100 times lower than the extinction coefficient of the donor chromophore involved, allowing us to experimentally estimate the transition dipole moment (0.3 D) and the electronic coupling between ground state and CT state to be on the order of 30 meV.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/ja512410f
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/ja512410f.
dc.titleDirect correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy
dc.typeArticle
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentKAUST Solar Center (KSC)
dc.identifier.journalJournal of the American Chemical Society
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Materials and Centre for Plastic Electronics, Imperial College London, London, UK
dc.contributor.institutionDepartment of Materials Science and Engineering, Stanford University, California, USA
dc.contributor.institutionInstitut für Angewandte Photophysik TU Dresden, Dresden, Germany
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics, Imperial College London, London, UK
dc.contributor.institutionCSIRO Materials Science and Engineering, Clayton, VIC, Australia
dc.contributor.institutionNational Institute of Standards and Technology (NIST), Gaithersburg, USA
kaust.personAmassian, Aram
kaust.personDomingo, Ester
refterms.dateFOA2016-04-09T00:00:00Z


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