Ultrafast terahertz photoconductivity of bulk heterojunction materials reveals high carrier mobility up to nanosecond time scale.

Carlito Ponseca Jr, Arkady Yartsev, Ergang Wang, Mats R. Andersson, Dimali Vithanage, Villy Sundstrom

    Research output: Contribution to journalArticlepeer-review

    54 Citations (Scopus)

    Abstract

    The few-picosecond (ps) decay of terahertz (THz) photoconductivity typically observed for conjugated polymer:fullerene blends (at excitation fluencies ∼10 15 photons/cm 2 per pulse) is shown to be a result of charge pair annihilation for two polymer:PCBM blends. At a factor of 100 lower excitation density, the THz decay is in the hundreds of ps time scale, implying that very high carrier mobility (∼0.1 cm 2 V -1 s -1) prevails for long time after charge formation, of importance for free charge formation in organic solar cells.

    Original languageEnglish
    Pages (from-to)11836-11839
    Number of pages4
    JournalJournal of The American Chemical Society
    Volume134
    Issue number29
    DOIs
    Publication statusPublished - 25 Jul 2012

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