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Advanced Materials

Role of Localized States on Carrier Transport in Bulk Heterojunction Materials Comprised of Organic Small Molecule Donors

Authors

  • Chengmei Zhong,

    1. Center for Polymers and Organic Solids, University of California, Santa Barbara, California
    2. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, P. R. China
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  • Fei Huang,

    1. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, P. R. China
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  • Yong Cao,

    1. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, P. R. China
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  • Daniel Moses,

    Corresponding author
    1. Center for Polymers and Organic Solids, University of California, Santa Barbara, California
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  • Alan J. Heeger

    1. Center for Polymers and Organic Solids, University of California, Santa Barbara, California
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Abstract

The photocarrier transport properties in two leading molecular bulk-heterojunction systems, p-DTS(PTTh2)2:PC71BM and p-DTS(FBTTh2)2:PC71BM, are studied using transient photoconductivity measurements. We find that in these systems shallow trap states are distributed at relatively narrow energy range, giving rise to time-independent carrier mobility in the nanosecond time regime that evidently contributes to the high performance of molecular-based OPV devices.

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