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    Steric control of the donor/acceptor interface: Implications in organic photovoltaic charge generation

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    Type
    Article
    Authors
    Holcombe, Thomas W.
    Norton, Joseph E.
    Rivnay, Jonathan
    Woo, Claire
    Goris, Ludwig J.
    Piliego, Claudia
    Griffini, Gianmarco
    Sellinger, Alan cc
    Brédas, Jean Luc
    Salleo, Alberto
    Frechet, Jean cc
    KAUST Department
    Chemical Science Program
    Office of the VP
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    KUS-C1-015-21
    Date
    2011-08-10
    Permanent link to this record
    http://hdl.handle.net/10754/561841
    
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    Abstract
    The performance of organic photovoltaic (OPV) devices is currently limited by modest short-circuit current densities. Approaches toward improving this output parameter may provide new avenues to advance OPV technologies and the basic science of charge transfer in organic semiconductors. This work highlights how steric control of the charge separation interface can be effectively tuned in OPV devices. By introducing an octylphenyl substituent onto the investigated polymer backbones, the thermally relaxed charge-transfer state, and potentially excited charge-transfer states, can be raised in energy. This decreases the barrier to charge separation and results in increased photocurrent generation. This finding is of particular significance for nonfullerene OPVs, which have many potential advantages such as tunable energy levels and spectral breadth, but are prone to poor exciton separation efficiencies. Computational, spectroscopic, and synthetic methods were combined to develop a structure-property relationship that correlates polymer substituents with charge-transfer state energies and, ultimately, device efficiencies. © 2011 American Chemical Society.
    Sponsors
    This work was supported by the Center for Advanced Molecular Photovoltaics (Award No. KUS-C1-015-21), supported by King Abdullah University of Science and Technology (KAUST), and the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 (synthesis and some device characterization work). T.W.H., C.H.W., and J.R. thank the National Science Foundation for graduate research fellowships. We gratefully acknowledge Polyera Inc. and Paul Armstrong for providing the Active Ink N2200 and PDL respectively, used in this study. Paul Armstrong and Yoshi Miyamoto are thanked for assistance with device optimization. We also thank David Kavulak and Barry Thompson for helpful discussions.
    Publisher
    American Chemical Society (ACS)
    Journal
    Journal of the American Chemical Society
    DOI
    10.1021/ja203235z
    ae974a485f413a2113503eed53cd6c53
    10.1021/ja203235z
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program

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