Efficient charge generation by relaxed charge-transfer states at organic interfaces

Handle URI:
http://hdl.handle.net/10754/563088
Title:
Efficient charge generation by relaxed charge-transfer states at organic interfaces
Authors:
Vandewal, Koen; Albrecht, Steve N.; Hoke, Eric T.; Graham, Kenneth; Widmer, Johannes; Douglas, Jessica D.; Schubert, Marcel; Mateker, William R.; Bloking, Jason T.; Burkhard, George F.; Sellinger, Alan; Frechet, Jean ( 0000-0001-6419-0163 ) ; Amassian, Aram ( 0000-0002-5734-1194 ) ; Riede, Moritz Kilian; McGehee, Michael D.; Neher, Dieter; Salleo, Alberto
Abstract:
Interfaces 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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC); Chemical Science Program; Organic Electronics and Photovoltaics Group
Publisher:
Springer Nature
Journal:
Nature Materials
Issue Date:
17-Nov-2013
DOI:
10.1038/nmat3807
Type:
Article
ISSN:
14761122
Sponsors:
This 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.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorVandewal, Koenen
dc.contributor.authorAlbrecht, Steve N.en
dc.contributor.authorHoke, Eric T.en
dc.contributor.authorGraham, Kennethen
dc.contributor.authorWidmer, Johannesen
dc.contributor.authorDouglas, Jessica D.en
dc.contributor.authorSchubert, Marcelen
dc.contributor.authorMateker, William R.en
dc.contributor.authorBloking, Jason T.en
dc.contributor.authorBurkhard, George F.en
dc.contributor.authorSellinger, Alanen
dc.contributor.authorFrechet, Jeanen
dc.contributor.authorAmassian, Aramen
dc.contributor.authorRiede, Moritz Kilianen
dc.contributor.authorMcGehee, Michael D.en
dc.contributor.authorNeher, Dieteren
dc.contributor.authorSalleo, Albertoen
dc.date.accessioned2015-08-03T11:35:31Zen
dc.date.available2015-08-03T11:35:31Zen
dc.date.issued2013-11-17en
dc.identifier.issn14761122en
dc.identifier.doi10.1038/nmat3807en
dc.identifier.urihttp://hdl.handle.net/10754/563088en
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.en
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.en
dc.publisherSpringer Natureen
dc.titleEfficient charge generation by relaxed charge-transfer states at organic interfacesen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentOrganic Electronics and Photovoltaics Groupen
dc.identifier.journalNature Materialsen
dc.contributor.institutionDepartment of Materials Science and Engineering, Stanford University, 476 Lomita Mall, Stanford, CA 94305, United Statesen
dc.contributor.institutionInstitute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam, Germanyen
dc.contributor.institutionInstitut für Angewandte Photophysik TU Dresden, George-Bähr-Strasse 1, 01062, Dresden, Germanyen
dc.contributor.institutionDepartment of Chemistry, University of California, 727 Latimer Hall, Berkeley, CA 94720, United Statesen
dc.contributor.institutionDepartment of Chemistry and Geochemistry, Colorado School of Mines, Golden, CO 80401, United Statesen
dc.contributor.institutionDepartment of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdomen
kaust.authorGraham, Kennethen
kaust.authorFrechet, Jeanen
kaust.authorAmassian, Aramen
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