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

    Cite this

    Petersen, Martin Helgesen ; Gevorgyan, Suren ; Krebs, Frederik C ; Janssen, Rene A.J. / Substituted 2,1,3-Benzothiadiazole- And Thiophene-Based Polymers for Solar Cells - Introducing a New Thermocleavable Precursor. In: Chemistry of Materials. 2009 ; Vol. 21, No. 19. pp. 4669-4675.
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    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 {\circledC} 2009 American Chemical Society",
    keywords = "Polymer solar cells, Solar energy, Plastsolceller, Solenergi",
    author = "Petersen, {Martin Helgesen} and Suren Gevorgyan and Krebs, {Frederik C} and Janssen, {Rene A.J.}",
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    Substituted 2,1,3-Benzothiadiazole- And Thiophene-Based Polymers for Solar Cells - Introducing a New Thermocleavable Precursor. / Petersen, Martin Helgesen; Gevorgyan, Suren; Krebs, Frederik C; Janssen, Rene A.J.

    In: Chemistry of Materials, Vol. 21, No. 19, 2009, p. 4669-4675.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Substituted 2,1,3-Benzothiadiazole- And Thiophene-Based Polymers for Solar Cells - Introducing a New Thermocleavable Precursor

    AU - Petersen, Martin Helgesen

    AU - Gevorgyan, Suren

    AU - Krebs, Frederik C

    AU - Janssen, Rene A.J.

    PY - 2009

    Y1 - 2009

    N2 - 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

    AB - 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

    KW - Polymer solar cells

    KW - Solar energy

    KW - Plastsolceller

    KW - Solenergi

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