Substituted 2,1,3-Benzothiadiazole- And Thiophene-Based Polymers for Solar Cells - Introducing a New Thermocleavable Precursor

Martin Helgesen Petersen, Suren Gevorgyan, Frederik C Krebs, Rene A.J. Janssen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Alkoxysubstituted and unsubstituted 2,1,3-benzothiadiazoles were prepared and copolymerized with substituted and unsubstituted thiophenes using both Stille and Yamamoto cross-coupling reactions. One class of the materials bore thermally labile ester groups. The materials were all found to have a reduced band gap in the range of 1.69−1.75 eV and were explored in polymer photovoltaic devices as mixtures with the soluble fullerene PCBM. High open circuit voltages of up to 0.93 V and power conversion efficiencies (PCE) of up to 2.22% was observed for materials without the thermally labile groups. The thermocleavable materials have the advantage that they are insoluble after a thermal treatment, enabling a larger degree of processing freedom when preparing multilayer devices and they provide a better operational stability for the devices. So far the process of thermocleavage has led to poorer device performance than for the soluble precursor polymers; however, we found processing conditions that lead to a higher performance for the thermocleaved product, where open circuit voltages of up to 0.9 V could be obtained with power conversion efficiencies of up to 0.42%, representing a doubling as compared to the soluble precursor polymer. Copyright © 2009 American Chemical Society
    Original languageEnglish
    JournalChemistry of Materials
    Volume21
    Issue number19
    Pages (from-to)4669-4675
    ISSN0897-4756
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Polymer solar cells
    • Solar energy

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