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Issue 11, 2010
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Small band gap polymers based on diketopyrrolopyrrole

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New small band gap polymers incorporating diketopyrrolopyrrole units have been synthesized using Suzuki and Yamamoto polymerization. By alternating the electron-deficient diketopyrrolopyrrole units with different electron-rich aromatic segments, polymers were obtained with band gaps ranging from 1.24 to 1.77 eV in thin films. In field-effect transistors these polymers exhibit ambipolar charge transport with hole and electron mobilities up to 2.1 × 10−3 cm2/Vs and 1.6 × 10−4 cm2/Vs, respectively. The polymers were applied as electron donor in bulk heterojunction solar cells with [60]PCBM as electron acceptor to give a maximum power conversion efficiency of 1.7% under simulated standard solar light (AM1.5G, 100 mW/cm2). The morphology of the bulk heterojunction blend seems to limit the photovoltaic performance.

Graphical abstract: Small band gap polymers based on diketopyrrolopyrrole

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The article was received on 14 Sep 2009, accepted on 05 Jan 2010 and first published on 03 Feb 2010

Article type: Paper
DOI: 10.1039/B919066J
J. Mater. Chem., 2010,20, 2240-2246

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    Small band gap polymers based on diketopyrrolopyrrole

    A. P. Zoombelt, S. G. J. Mathijssen, M. G. R. Turbiez, M. M. Wienk and R. A. J. Janssen, J. Mater. Chem., 2010, 20, 2240
    DOI: 10.1039/B919066J

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