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Bulk Heterojunction Organic Photovoltaics Based on Carboxylated Polythiophenes and PCBM on Glass and Plastic Substrates

Authors

  • Brian J. Worfolk,

    1. Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
    2. NRC-National Institute for Nanotechnology, Edmonton, Alberta, T6G 2M9 Canada
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  • David A. Rider,

    1. Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
    2. NRC-National Institute for Nanotechnology, Edmonton, Alberta, T6G 2M9 Canada
    3. Departments of Chemistry and Engineering Technology, Western Washington University, Bellingham, WA, 98225, U.S.A.
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  • Anastasia L. Elias,

    1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada
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  • Michael Thomas,

    1. NRC-National Institute for Nanotechnology, Edmonton, Alberta, T6G 2M9 Canada
    2. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada
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  • Kenneth D. Harris,

    Corresponding author
    1. NRC-National Institute for Nanotechnology, Edmonton, Alberta, T6G 2M9 Canada
    • NRC-National Institute for Nanotechnology, Edmonton, Alberta, T6G 2M9 Canada.
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  • Jillian M. Buriak

    Corresponding author
    1. Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
    2. NRC-National Institute for Nanotechnology, Edmonton, Alberta, T6G 2M9 Canada
    • NRC-National Institute for Nanotechnology, Edmonton, Alberta, T6G 2M9 Canada.
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Abstract

The optoelectronic and photophysical properties of four regioregular poly[3-(carboxyalkyl)thiophene-2,5-diyl] (P3CAT) with different carboxyalkyl chain lengths (propyl to hexyl) are reported. Each P3CAT is combined with [6,6]-phenyl-C61-butyric acid methyl ester to form the photoactive bulk heterojunction layer for organic photovoltaic devices. The extent of hydrogen bonding and polymer crystallinity in the films has been determined through infrared spectroscopy and X-ray diffraction. The mechanical properties of films are analyzed with nanoindentation, and the measurements suggest that P3CATs are suitable for use in flexible devices. Power conversion efficiencies of up to 2.6% and 1.6% are obtained for devices fabricated in air, and supported on glass and flexible poly(ethylene terephthalate) substrates, respectively.

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