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Issue 25, 2011
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Copolymers of diketopyrrolopyrrole and thienothiophene for photovoltaic cells

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Abstract

Three copolymers of thieno[3,2-b]thiophene (TT) and diketopyrrolo[3,4-c]pyrrole (DPP) with a varying number of interconnecting thiophene units (nT) were synthesized by Suzuki polymerization. The PDPPnT-TT polymers display optical band gaps in the range of 1.33 to 1.52 eV and show ambipolar charge transport when applied in a field-effect transistor (FET) with hole and electron mobilities up to 3 × 10−2 and 2 × 10−3 cm2 V−1s−1, respectively. Organic solar cells based on the PDPPnT-TT polymers as donors and the fullerene derivative [60]PCBM as acceptor achieve power conversion efficiencies up to 3.4% when the layer is deposited with the use of a co-solvent. The co-solvent strongly affects the morphology of the active layer and improves the performance. For these polymers the LUMO–LUMO offset with [60]PCBM correlates with the photocurrent and the maximum external quantum efficiency.

Graphical abstract: Copolymers of diketopyrrolopyrrole and thienothiophene for photovoltaic cells

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Publication details

The article was received on 05 Mar 2011, accepted on 27 Apr 2011 and first published on 26 May 2011


Article type: Paper
DOI: 10.1039/C1JM10961H
Citation: J. Mater. Chem., 2011,21, 9224-9231

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    Copolymers of diketopyrrolopyrrole and thienothiophene for photovoltaic cells

    J. C. Bijleveld, R. A. M. Verstrijden, M. M. Wienk and R. A. J. Janssen, J. Mater. Chem., 2011, 21, 9224
    DOI: 10.1039/C1JM10961H

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