Optical detection of ion diffusion in electrochromic poly(3,4-ethylenedioxy)thiophene film using microcantilever electrodes

Rong Lin, Kurt Stokbro, Dorte Nørgaard Madsen, E. Boubour, Peter Bøggild

    Research output: Contribution to journalJournal articlepeer-review

    Abstract

    We present measurements of microscale electrochromic switching of poly(3,4-ethylenedioxy)thiophene doped with poly(4-styrene sulfonate), thin film using microfabricated multi-point probe electrodes. After treatment with a dilute hydrochloric acid, a voltage bias above 3 V with respect to the ground potential of the film induced dark (light-absorbing) rings, which spread out from the anode on a time scale of seconds. The rate of expansion of the rings as well as the final diameter depended on the bias voltage. Using two micro four-point probes simultaneously, we measured with one probe the conductance of the film outside, near and inside a dark ring induced by a voltage applied to another probe and found the resistivity to be directly related to the observed absorbance of the film. The standard electrochromic mechanism of ion insertion was used to explain the observations. We anticipate this experimental approach to provide new insight into ion diffusion in electrochromic films, allowing real-time recording of diffusion dynamics on a microscale to be studied directly. (c) 2005 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalThin Solid Films
    Volume484
    Issue number1-2
    Pages (from-to)334-340
    ISSN0040-6090
    DOIs
    Publication statusPublished - 2005

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