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What is the binding energy of a charge transfer state in an organic solar cell?

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dc.title What is the binding energy of a charge transfer state in an organic solar cell? en
dc.contributor.author Athanasopoulos, Stavros
dc.contributor.author Schauer, Franz
dc.contributor.author Nádaždy, Vojtech
dc.contributor.author Weiß, Mareike
dc.contributor.author Kahle, Frank-Julian
dc.contributor.author Scherf, Ullrich
dc.contributor.author Bässler, Heinz
dc.contributor.author Köhler, Anna
dc.relation.ispartof Advanced Energy Materials
dc.identifier.issn 1614-6832 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2019
dc.type article
dc.language.iso en
dc.publisher Wiley-VCH Verlag
dc.identifier.doi 10.1002/aenm.201900814
dc.relation.uri https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201900814
dc.subject activation energy en
dc.subject binding energy en
dc.subject charge transfer en
dc.subject organic photovoltaic en
dc.subject photodissociation en
dc.description.abstract The high efficiencies reported for organic solar cells and an almost negligible thermal activation measured for the photogeneration of charge carriers have called into question whether photoinduced interfacial charge transfer states are bound by a significant coulomb attraction, and how this can be reconciled with very low activation energies. Here, this question is addressed in a combined experimental and theoretical approach. The interfacial binding energy of a charge-transfer state in a blend of MeLPPP:PCBM is determined by using energy resolved electrochemical impedance spectroscopy and is found to be about 0.5 eV. Temperature-dependent photocurrent measurements on the same films, however, give an activation energy that is about one order of magnitude lower. Using analytical calculations and Monte Carlo simulation the authors illustrate how i) interfacial energetics and ii) transport topology reduce the activation energy required to separate the interfacial electron–hole pair, with about equal contributions from both effects. The activation energy, however, is not reduced by entropy, although entropy increases the overall photodissociation yield. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim en
utb.faculty Faculty of Applied Informatics
dc.identifier.uri http://hdl.handle.net/10563/1008691
utb.identifier.obdid 43879919
utb.identifier.scopus 2-s2.0-85065743834
utb.identifier.wok 000477778000006
utb.source j-scopus
dc.date.accessioned 2019-08-07T11:46:07Z
dc.date.available 2019-08-07T11:46:07Z
dc.description.sponsorship German Science Foundation DFG [GRK1640]; Bavarian State Ministry of Education, Science and the Arts through the Collaborative Research Network " Solar Technologies go Hybrid" (SolTech); EU-Marie-Sklodowska-Curie-ITN Network INFORM; Elite Network Bavaria (ENB); CONEX program; Universidad Carlos III de Madrid; European Union's Seventh Framework Programme for research, technological development and demonstration [600371]; Banco Santander; el Ministerio de Economia, Industria y Competitividad [COFUND2014-51509]; el Ministerio de Educacion, Cultura y Deporte [CEI-15-17]
utb.contributor.internalauthor Schauer, Franz
utb.fulltext.affiliation Stavros Athanasopoulos, Franz Schauer, Vojtech Nádaždy, Mareike Weiß, Frank-Julian Kahle, Ullrich Scherf, Heinz Bässler, Anna Köhler* Departamento de Física Universidad Carlos III de Madrid Avenida Universidad 30, Leganés 28911, Madrid, Spain Faculty of Applied Informatics Tomas Bata University in Zlín 760 05 Zlín, Czech Republic Institute of Physics of the Slovak Academy of Sciences Dúbravská cesta 9, 845 11 Bratislava, Slovak Republic Soft Matter Optoelectronics Department of Physics University of Bayreuth Universitätsstr. 30, 95448 Bayreuth, Germany E-mail: anna.koehler@uni-bayreuth.de Department of Chemistry Bergische Universität Wuppertal Gauss-Str. 20, 42119 Wuppertal, Germany Bayreuth Institute of Macromolecular Research (BIMF) University of Bayreuth Universitätsstr. 30, 95448 Bayreuth, Germany Bavarian Polymer Institute University of Bayreuth Universitätsstr. 30, 95448 Bayreuth, Germany
utb.fulltext.dates Received: March 12, 2019 Revised: April 13, 2019 Published online: May 12, 2019
utb.fulltext.sponsorship The authors gratefully acknowledge financial support from the German Science Foundation DFG through the research training group GRK1640 “Photophysics of Synthetic and Biological Multichromophoric Systems” and from the Bavarian State Ministry of Education, Science and the Arts through the Collaborative Research Network “Solar Technologies go Hybrid” (SolTech), and by the EU-Marie-Skłodowska-Curie-ITN Network INFORM. Furthermore, F.-J.K. was supported by the Elite Network Bavaria (ENB) in the framework of the Elite Study Program “Macromolecular Science.” This project was supported by the CONEX program and received funding from the Universidad Carlos III de Madrid, the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 600371, el Ministerio de Economía, Industria y Competitividad (COFUND2014-51509) el Ministerio de Educación, Cultura y Deporte (CEI-15-17) and Banco Santander.
utb.wos.affiliation [Athanasopoulos, Stavros] Univ Carlos III Madrid, Dept Fis, Ave Univ 30, Madrid 28911, Spain; [Schauer, Franz] Tomas Bata Univ Zlin, Fac Appl Informat, Zlin 76005, Czech Republic; [Nadazdy, Vojtech] Slovak Acad Sci, Inst Phys, Dubravska Cesta 9, Bratislava 84511, Slovakia; [Weiss, Mareike; Kahle, Frank-Julian; Koehler, Anna] Univ Bayreuth, Dept Phys, Soft Matter Optoelect, Univ Str 30, D-95448 Bayreuth, Germany; [Scherf, Ullrich] Berg Univ Wuppertal, Dept Chem, Gauss Str 20, D-42119 Wuppertal, Germany; [Baessler, Heinz; Koehler, Anna] Univ Bayreuth, Bayreuth Inst Macromol Res BIMF, Univ Str 30, D-95448 Bayreuth, Germany; [Koehler, Anna] Univ Bayreuth, Bavarian Polymer Inst, Univ Str 30, D-95448 Bayreuth, Germany
utb.scopus.affiliation Departamento de Física, Universidad Carlos III de Madrid, Avenida Universidad 30, Leganés, Madrid 28911, Spain; Faculty of Applied Informatics, Tomas Bata University in Zlín, Zlín, 760 05, Czech Republic; Institute of Physics of the Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, 845 11, Slovakia; Soft Matter Optoelectronics, Department of Physics, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95448, Germany; Department of Chemistry, Bergische Universität Wuppertal, Gauss-Str. 20, Wuppertal, 42119, Germany; Bayreuth Institute of Macromolecular Research (BIMF), University of Bayreuth, Universitätsstr. 30, Bayreuth, 95448, Germany; Bavarian Polymer Institute, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95448, Germany
utb.fulltext.projects GRK1640
utb.fulltext.projects 600371
utb.fulltext.projects COFUND2014-51509
utb.fulltext.projects CEI-15-17
utb.fulltext.faculty Faculty of Applied Informatics
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