Influence of molecular weight on the performance of organic solar cells based on a fluorene derivative

Chris Muller, Ergang Wang, Lars Andersson, Kristofer Tvingstedt, Yi Zhou, Mats R. Andersson, Olle Inganas

    Research output: Contribution to journalArticle

    108 Citations (Scopus)

    Abstract

    The performance of organic photovoltaic (OPV) bulk-heterojunction blends comprising a liquid-crystalline fluorene derivative and a small-molecular fullerene is found to increase asymptotically with the degree of polymerization of the former. Similar to various thermodynamic transition temperatures as well as the light absorbance of the fluorene moiety, the photocurrent extracted from OPVdevices is found to strongly vary with increasing oligomer size up to a number average molecular weight, M n≈10 kg mol 1, but is rendered less chain-length dependent for higher M n as the fluorene derivative gradually adopts polymeric behavior.

    Original languageEnglish
    Pages (from-to)2124-2131
    Number of pages8
    JournalAdvanced Functional Materials
    Volume20
    Issue number13
    DOIs
    Publication statusPublished - 9 Jul 2010

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