Advanced Materials

Low-Bandgap Alternating Fluorene Copolymer/Methanofullerene Heterojunctions in Efficient Near-Infrared Polymer Solar Cells

Authors

  • F. Zhang,

    1. Biomolecular and Organic Electronics, Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Sweden
    2. Center of Organic Electronics (COE), Linköping University, 58183 Linköping, Sweden
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  • W. Mammo,

    1. Department of Chemistry, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia
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  • L. M. Andersson,

    1. Biomolecular and Organic Electronics, Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Sweden
    2. Center of Organic Electronics (COE), Linköping University, 58183 Linköping, Sweden
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  • S. Admassie,

    1. Department of Chemistry, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia
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  • M. R. Andersson,

    1. Polymer Technology, Department of Chemical and Biological Engineering, Chalmers University of Technology, 41296 Göteborg, Sweden
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  • O. Inganäs

    1. Biomolecular and Organic Electronics, Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Sweden
    2. Center of Organic Electronics (COE), Linköping University, 58183 Linköping, Sweden
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  • We acknowledge financial support from the Swedish Ministry of Education through the National Graduate School for Materials Science, the Swedish Research Council, and the Center of Organic Electronics, funded by SSF. W. Mammo acknowledges OPCW for an internship support and the International Program in the Chemical Sciences (IPICS) for financial assistance.

Abstract

Efficient near-IR polymer solar cells based on the low-bandgap alternating fluorene copolymer APFO-Green 5 (shown in the figure) exhibit a photoresponse up to 800 nm. The copolymer performs well in combination with the common electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), reaching a power-conversion efficiency of 2.2 % with a lower PCBM content in the active layer than previous devices based on low-bandgap polymers.

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