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Issue 2, 2017
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Perylene diimide isomers containing a simple sp3-core for non-fullerene-based polymer solar cells

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Abstract

In order to investigate the effect of the geometries of perylene diimide (PDI)-based small molecules, five different isomers were synthesized by using a cyclohexane core as a simple sp3-σ core. Diaminocylohexane is such an effective core for the systematic development of many kinds of isomers via geometric tuning as well as for reducing the self-aggregation tendency of PDIs. Depending on the anchoring position of the PDI units on the cyclohexane core (ortho-, meta- and para-), isomers exhibited differences in solubility and crystallinity. Among the studied isomers, ortho-substituted t-OCP was found to have a highly twisted molecular structure which minimizes the strong tendency towards crystallization due to individual PDI moieties. The unique geometrical nature of the t-OCP isomer led to the highest power conversion efficiency (PCE = 6.23%) of bulk heterojunction (BHJ) polymer solar cells (PSCs) with a higher short-circuit current density (Jsc) and fill factor (FF). It is mainly ascribed to the formation of a nanophase interpenetrating network with well-balanced carrier mobility in the blend film.

Graphical abstract: Perylene diimide isomers containing a simple sp3-core for non-fullerene-based polymer solar cells

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Publication details

The article was received on 30 Oct 2016, accepted on 21 Nov 2016 and first published on 22 Nov 2016


Article type: Paper
DOI: 10.1039/C6TA09394A
J. Mater. Chem. A, 2017,5, 663-671

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    Perylene diimide isomers containing a simple sp3-core for non-fullerene-based polymer solar cells

    G. E. Park, S. Choi, D. H. Lee, M. Godumala, M. A. Uddin, H. Y. Woo, M. J. Cho and D. H. Choi, J. Mater. Chem. A, 2017, 5, 663
    DOI: 10.1039/C6TA09394A

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