Overcoming Degradation in Organic Photovoltaics: Illuminating the Role of Fullerene Functionalization: Preprint

    Research output: Contribution to conferencePaper

    Abstract

    Photobleaching rates are investigated for thin films of poly(3-hexylthiophene) (P3HT) blends employing either an indene-C60 bisadduct (ICBA) or [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as the electron acceptor. Relative to the bisindene, PCBM significantly enhances resistance to photobleaching of the P3HT donor polymer. We tentatively attribute a decrease in the charge transfer rate asthe mechanism responsible for the more rapid photobleaching in the sample containing the bisindene adduct. In order to elucidate the influence of the photobleaching rate on the initial performance of unencapsulated devices, we also monitored the time-dependent behavior for P3HT:fullerene inverted devices. Under conditions of constant illumination, we observe essentially identical behavior indevice performance parameters regardless of the energy levels of the electron acceptor. We conclude that over the time frame measured for these devices, the primary degradation mechanism of the active layer is independent of the electron acceptor, despite the enhanced tolerance to photobleaching it may impart to the donor material.
    Original languageAmerican English
    Number of pages6
    StatePublished - 2011
    Event37th IEEE Photovoltaic Specialists Conference (PVSC 37) - Seattle, Washington
    Duration: 19 Jun 201124 Jun 2011

    Conference

    Conference37th IEEE Photovoltaic Specialists Conference (PVSC 37)
    CitySeattle, Washington
    Period19/06/1124/06/11

    NREL Publication Number

    • NREL/CP-5200-51745

    Keywords

    • degradation
    • OPV
    • photobleaching
    • PV
    • thin films

    Fingerprint

    Dive into the research topics of 'Overcoming Degradation in Organic Photovoltaics: Illuminating the Role of Fullerene Functionalization: Preprint'. Together they form a unique fingerprint.

    Cite this