Black polymers in bulk-heterojunction solar cells.

Yi Zhou, Desta Gedefaw, Stefan Hellstrom, Ilse Kratschmer, Fengling Zhang, Wendimagegn Mammo, Olle Inganas, Mats R. Andersson

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    10 Citations (Scopus)


    The active materials in polymer solar cells have a decisive role on the performance of the cells. Polymers with extended absorption, i.e., black polymers with absorption covering the whole visible region are desired in order to capture the important parts of the solar irradiation. Different ways of achieving black active materials are discussed and two new alternating polyfluorene (APFO) copolymers with broad absorption, APFO-Black 1 and APFO-Black 2, using two different design strategies are described. The UV-Vis absorption spectra of the polymers extend to approximately 850 nm, and the polymers were used as donors and 6,6-phenyl-C $-{61}$-butyric acid methyl ester (PCBM)60 or PCBM70 as acceptors in solar cell devices in various mixing ratios. The best combinations yielded an overall power conversion efficiency of 1.2 for APFO-Black 1 and 1.5 for APFO-Black 2.

    Original languageEnglish
    Article number5491033
    Pages (from-to)1565-1572
    Number of pages8
    Issue number6
    Publication statusPublished - Nov 2010


    • Atomic force microscopy (AFM)
    • charge-carrier mobility
    • fullerene
    • photovoltaic cell materials
    • solar energy

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    Zhou, Y., Gedefaw, D., Hellstrom, S., Kratschmer, I., Zhang, F., Mammo, W., Inganas, O., & Andersson, M. R. (2010). Black polymers in bulk-heterojunction solar cells. IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, 16(6), 1565-1572. [5491033].