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dc.contributor.authorVandewal, Koen
dc.contributor.authorAlbrecht, Steve N.
dc.contributor.authorHoke, Eric T.
dc.contributor.authorGraham, Kenneth
dc.contributor.authorWidmer, Johannes
dc.contributor.authorDouglas, Jessica D.
dc.contributor.authorSchubert, Marcel
dc.contributor.authorMateker, William R.
dc.contributor.authorBloking, Jason T.
dc.contributor.authorBurkhard, George F.
dc.contributor.authorSellinger, Alan
dc.contributor.authorFrechet, Jean
dc.contributor.authorAmassian, Aram
dc.contributor.authorRiede, Moritz Kilian
dc.contributor.authorMcGehee, Michael D.
dc.contributor.authorNeher, Dieter
dc.contributor.authorSalleo, Alberto
dc.date.accessioned2015-08-03T11:35:31Z
dc.date.available2015-08-03T11:35:31Z
dc.date.issued2013-11-17
dc.identifier.issn14761122
dc.identifier.pmid24240240
dc.identifier.doi10.1038/nmat3807
dc.identifier.urihttp://hdl.handle.net/10754/563088
dc.description.abstractInterfaces between organic electron-donating (D) and electron-accepting (A) materials have the ability to generate charge carriers on illumination. Efficient organic solar cells require a high yield for this process, combined with a minimum of energy losses. Here, we investigate the role of the lowest energy emissive interfacial charge-transfer state (CT1) in the charge generation process. We measure the quantum yield and the electric field dependence of charge generation on excitation of the charge-transfer (CT) state manifold via weakly allowed, low-energy optical transitions. For a wide range of photovoltaic devices based on polymer:fullerene, small-molecule:C60 and polymer:polymer blends, our study reveals that the internal quantum efficiency (IQE) is essentially independent of whether or not D, A or CT states with an energy higher than that of CT1 are excited. The best materials systems show an IQE higher than 90% without the need for excess electronic or vibrational energy. © 2014 Macmillan Publishers Limited.
dc.description.sponsorshipThis publication was supported by the Center for Advanced Molecular Photovoltaics (Award No KUS-C1-015-21) and the Department of Energy, Laboratory Directed Research and Development funding, under contract DE-AC02-76SF00515. The PCDTBT used in this work was provided by St-Jean Photochemicals. M. K. R. acknowledges financial support by the BMBF through project 03IP602 and J. W. acknowledges support from the Heinrich-Boll-Stiftung. S.A. and M.S. acknowledge financial support by the BMBF within PVcomB (FKZ 03IS2151D) and the DFG (SPP 1355). D.N. thanks the DFG for financially supporting a travel grant. K.R.G. and A.A. acknowledge SABIC for a post-doctoral fellowship. The authors thank J. Kurpiers for technical assistance with the TDCF set-up.
dc.publisherSpringer Nature
dc.titleEfficient charge generation by relaxed charge-transfer states at organic interfaces
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentOffice of the VP
dc.contributor.departmentOrganic Electronics and Photovoltaics Group
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalNature Materials
dc.contributor.institutionDepartment of Materials Science and Engineering, Stanford University, 476 Lomita Mall, Stanford, CA 94305, United States
dc.contributor.institutionInstitute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germany
dc.contributor.institutionInstitut für Angewandte Photophysik TU Dresden, George-Bähr-Strasse 1, 01062, Dresden, Germany
dc.contributor.institutionDepartment of Chemistry, University of California, 727 Latimer Hall, Berkeley, CA 94720, United States
dc.contributor.institutionDepartment of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO 80401, United States
dc.contributor.institutionDepartment of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
kaust.personGraham, Kenneth
kaust.personFrechet, Jean
kaust.personAmassian, Aram
dc.date.published-online2013-11-17
dc.date.published-print2014-01


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