Polymer BHJ solar cell performance tuning by C60 fullerene derivative alkyl side‐chain length |
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| Authors: | Christian Kästner Christoph Ulbricht Daniel A M Egbe Harald Hoppe |
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| Institution: | 1. Institute of Physics, Ilmenau University of Technology, D‐98693 Ilmenau, Germany;2. Linz Institute for Organic Solar Cells, Johannes Kepler University Linz, A‐4040 Linz, Austria |
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| Abstract: | A systematic study on the influence of the alkyl side‐chain length of C60 based fullerene derivatives in polymer solar cells based on an anthracene‐containing poly(p‐phenylene‐ethynylene)‐alt‐poly(p‐phenylene‐vinylene) (PPE‐PPV) copolymer (AnE‐PV) is reported. It is shown that the alkyl side‐chain length of the fullerene derivative strongly correlates with the individual photovoltaic parameters. The most pronounced dependence on the side‐chain length is found for the fill factor, spanning the range between 50–72%, which dominantly controls in combination with the short‐circuit current the power conversion efficiency. The maximum performance of 4.8% was found for an ethyl terminated side‐chain, whereas larger alkyl groups resulted in a gradually decreasing power conversion efficiency. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012 |
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| Keywords: | alkyl side‐chain length conjugated polymers fullerenes fullerene derivatives polymer solar cells PPE‐PPV thin films |
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