Low band gap polymers for organic solar cells

Eva Bundgaard, Frederik C Krebs

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    Abstract

    The synthesis of copolymers based on thiophene, benzothiadiazole and benzo-bis-thiadiazole are described. The polymers were obtained by employing Stille cross coupling polymerization. The polymers were characterized by NMR, size exclusion chromatography, UV-vis and ultraviolet photoelectron spectroscopy. The results obtained from UV-vis and ultraviolet photoelectron spectroscopy showed band gaps of 2.1-1.7 eV for polymers based on benzothiadiazole and 0.7 eV for polymers based on benzo-bis-thiadiazole. Furthermore the results showed that the band gap decreases with an increase in the number, n, of thiophenes in the polymer repeating unit (n= 1-4). Large area photovoltaic devices were prepared and the results of these devices are described.
    © (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
    Original languageEnglish
    Title of host publicationOrganic Photovoltaics 7
    EditorsZ.H. Kafafi, P.A. Lane
    Number of pages10
    Volume6334
    Place of PublicationBellingham
    PublisherSPIE - International Society for Optical Engineering
    Publication date2008
    Article number63340T
    DOIs
    Publication statusPublished - 2008
    EventSPIE conference on optics and photonics - San Diego, United States
    Duration: 13 Aug 200617 Aug 2006

    Conference

    ConferenceSPIE conference on optics and photonics
    CountryUnited States
    CitySan Diego
    Period13/08/200617/08/2006
    SeriesProceedings of SPIE, the International Society for Optical Engineering
    Volume6334
    ISSN0277-786X

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