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    Direct correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy

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    Type
    Article
    Authors
    Domingo, Ester
    Vandewal, Koen
    Fei, Zhuping
    Watkins, Scott E.
    Scholes, Fiona H.
    Bannock, James H
    de Mello, John
    Richter, Lee J. cc
    DeLongchamp, Dean M.
    Amassian, Aram cc
    Heeney, Martin cc
    Salleo, Alberto
    Stingelin, Natalie cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Organic Electronics and Photovoltaics Group
    Physical Science and Engineering (PSE) Division
    Date
    2015-04-16
    Online Publication Date
    2015-04-16
    Print Publication Date
    2015-04-29
    Permanent link to this record
    http://hdl.handle.net/10754/550071
    
    Metadata
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    Abstract
    We 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.
    Citation
    Direct correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy 2015:150409144253004 Journal of the American Chemical Society
    Publisher
    American Chemical Society (ACS)
    Journal
    Journal of the American Chemical Society
    DOI
    10.1021/ja512410f
    PubMed ID
    25856143
    Additional Links
    http://pubs.acs.org/doi/abs/10.1021/ja512410f
    ae974a485f413a2113503eed53cd6c53
    10.1021/ja512410f
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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