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

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    Type
    Article
    Authors
    Vandewal, Koen
    Albrecht, Steve N.
    Hoke, Eric T.
    Graham, Kenneth
    Widmer, Johannes
    Douglas, Jessica D.
    Schubert, Marcel cc
    Mateker, William R.
    Bloking, Jason T.
    Burkhard, George F.
    Sellinger, Alan cc
    Frechet, Jean cc
    Amassian, Aram cc
    Riede, Moritz Kilian
    McGehee, Michael D.
    Neher, Dieter cc
    Salleo, Alberto
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Office of the VP
    Organic Electronics and Photovoltaics Group
    Physical Science and Engineering (PSE) Division
    Date
    2013-11-17
    Online Publication Date
    2013-11-17
    Print Publication Date
    2014-01
    Permanent link to this record
    http://hdl.handle.net/10754/563088
    
    Metadata
    Show full item record
    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.
    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.
    Publisher
    Springer Nature
    Journal
    Nature Materials
    DOI
    10.1038/nmat3807
    PubMed ID
    24240240
    ae974a485f413a2113503eed53cd6c53
    10.1038/nmat3807
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Solar Center (KSC)

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