Bulk heterojunctions based on native polythiophene

Suren Gevorgyan, Frederik C Krebs

    Research output: Contribution to journalJournal articleResearchpeer-review


    Three different bulk heterojunctions were prepared by solution processing from the same precursor film. The procedure employs standard film-forining processing methods from solution whereby bulk heterojunctions of poly-(3-(2-methylhexan-2-yi)-oxy-carbonyldithiophene) (P3NIHOCT) and the fullerene derivatives [60]PCBM or [70]PCBM were prepared. The films were subjected to temperatures of 200 degrees C whereby P3MHOCT is converted to the more rigid and insoluble poly-3-carboxydithiophene (P3CT); films subjected to a temperature of 3 10 degrees C lead to decarboxylation of P3CT giving native unsubstituted polythiophene (PT). The same precursor film prepared by standard solution processing thus gave access to three chemically different bulk heterojunctions that were studied in terms of performance and stability. The device with a bulk heterojunction of PT/[70]PCBM and an active area of 3 cm(2) showed the best efficiency of 1.5% (1000 W m(-2), AM1.5G, 70 degrees C) as well as a slow decay of the performance over 500 h of continuous illumination in a nitrogen atmosphere (330 W m(-2), AM1.5G, 25 degrees C).
    Original languageEnglish
    JournalChemistry of Materials
    Issue number13
    Pages (from-to)4386-4390
    Publication statusPublished - 2008

    Bibliographical note

    This work was supported by the Danish
    Strategic Research Council (DSF 2104-05-0052 and 2104-07-


    Polymer Solar Cells for Solar Energy Conversion

    Krebs, F. C.


    Project: Research

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