Transient bleaching pulse shapes in electrochromic polysiloxane thin films

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    Abstract

    Transient bleaching currents are examined for a series of electrochromic carbazole-modified polysiloxane thin films. The shape of the bleaching currents is found to be sensitive to the type of counter-ion employed and the initial density of counter-ion charge that is deposited in the films during the colouration stage. Pure space-charge-limited (SCL) transport of counter-ions that posses a well-defined mobility is inconsistent with the observed pulse shapes and a modified SCL model that involves fast and slow mobility sites is proposed. The modified SCL model may describe a variety of transient bleaching pulse shapes (including current overshoots) as charge is removed from the electrochromic films and the counter-ions are constrained to transfer from slow to fast discharge sites.

    Original languageEnglish
    Pages (from-to)1818-1824
    Number of pages7
    JournalJournal of Materials Science
    Volume43
    Issue number6
    DOIs
    Publication statusPublished - Mar 2008

    Keywords

    • CARBAZOLE MODIFIED POLYSILOXANES
    • DISPLAYS
    • WO3
    • DEVICES
    • ISSUES

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