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Issue 6, 2017
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Charge separation in an acceptor–donor–acceptor triad material with a lamellar structure

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Abstract

Linking covalently both electron donor and acceptor components is an efficient way to gain thermodynamic control over the formation of well-ordered heterojunction materials suitable for organic photovoltaics. In this context, we attached flexible polymer segments to the termini of a (perylene bisimide)–quaterthiophene–(perylene bisimide) triad. The microphase segregation of the resulting coil-rod-coil architecture served to reliably promote the formation of lamellar phases. The lamellae were oriented vertically relative to the substrate, and they could be laterally aligned by mechanical rubbing, as determined by small and wide angle X-ray scattering, transmission electron microscopy, electron diffraction and AFM. Transient absorption spectroscopy revealed that light absorption was followed by charge separation and that charge recombination was slower in thin films than for solution-phase samples, especially when longer side chains were used. Thus, this study is a first step towards reliable lamellar phase segregation in donor–acceptor materials on the route towards improved materials for organic photovoltaics.

Graphical abstract: Charge separation in an acceptor–donor–acceptor triad material with a lamellar structure

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Publication details

The article was received on 01 Sep 2016, accepted on 02 Jan 2017 and first published on 03 Jan 2017


Article type: Paper
DOI: 10.1039/C6TC03786K
Citation: J. Mater. Chem. C, 2017,5, 1383-1393
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    Charge separation in an acceptor–donor–acceptor triad material with a lamellar structure

    D. Rolland, J. C. Brauer, L. Hartmann, L. Biniek, M. Brinkmann, N. Banerji and H. Frauenrath, J. Mater. Chem. C, 2017, 5, 1383
    DOI: 10.1039/C6TC03786K

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