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Issue 5, 2018
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Influence of alkyl chain length in S,N-heteropentacenes on the performance of organic solar cells

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Abstract

A novel family of alkyl-substituted S,N-heteropentacenes SN5 4–6 with a systematic variation of the alkyl side chains from methyl to hexyl is presented. The parent heteroacene series 4 and the acceptor end-capped series 5 and 6 were synthesized and characterized with respect to their structure–property relationships. The dicyanovinyl (DCV) end-capped derivatives 6a–f were implemented as donors in vacuum-processed bulk-heterojunction solar cells with fullerene C60 as acceptor, their photovoltaic behaviour studied, and structure–device relationships discussed. The devices exhibited power conversion efficiencies (PCE) in the range of 4–6% and interestingly a correlation between the length of the alkyl side chains and the photovoltaic performance of the resulting devices was discovered: an odd–even effect with higher values for the even-numbered alkyl chains. Atomic force microscopy (AFM) studies on the active layer surfaces gave hints for the explanation of this effect.

Graphical abstract: Influence of alkyl chain length in S,N-heteropentacenes on the performance of organic solar cells

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Publication details

The article was received on 28 Nov 2017, accepted on 26 Feb 2018 and first published on 26 Feb 2018


Article type: Research Article
DOI: 10.1039/C7QM00542C
Citation: Mater. Chem. Front., 2018,2, 959-968
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    Influence of alkyl chain length in S,N-heteropentacenes on the performance of organic solar cells

    T. D. Leitner, A. Vogt, D. Popović, E. Mena-Osteritz, K. Walzer, M. Pfeiffer and P. Bäuerle, Mater. Chem. Front., 2018, 2, 959
    DOI: 10.1039/C7QM00542C

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