Improvement of Interfacial Contacts for New Small-Molecule Bulk-Heterojunction Organic Photovoltaics

Authors

  • Andres Garcia,

    1. National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    2. Center for Energy Efficient Materials, University of California, Santa Barbara, California, 93106, USA
    3. Center for Interface Science: Solar Electric Materials, University of Arizona, Tucson, Arizona, USA
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  • Gregory C. Welch,

    1. Center for Energy Efficient Materials, University of California, Santa Barbara, California, 93106, USA
    2. Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
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  • Erin L. Ratcliff,

    1. Center for Interface Science: Solar Electric Materials, University of Arizona, Tucson, Arizona, USA
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  • David S. Ginley,

    1. National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    2. Center for Energy Efficient Materials, University of California, Santa Barbara, California, 93106, USA
    3. Center for Interface Science: Solar Electric Materials, University of Arizona, Tucson, Arizona, USA
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  • Guillermo C. Bazan,

    1. Center for Energy Efficient Materials, University of California, Santa Barbara, California, 93106, USA
    2. Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA
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  • Dana C. Olson

    Corresponding author
    1. National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, USA
    2. Center for Energy Efficient Materials, University of California, Santa Barbara, California, 93106, USA
    3. Center for Interface Science: Solar Electric Materials, University of Arizona, Tucson, Arizona, USA
    • National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, USA.

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Abstract

original image

The influence of protonation reactions between poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and a thiadiazolo[3,4-c]pyridine small-molecule donor are reported; these result in poor solar-cell performance due to a barrier for charge extraction. The use of a NiOx contact eliminates such deleterious chemical interactions and results in substantial improvements in open-circuit voltage, fill factor, and an increased power conversion efficiency from 2.3% to 5.1%.

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