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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.

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Notes

  1. Goldie DM, ɛr = 3.2 from unpublished capacitance data.

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  1. Division of Electronic Engineering and Physics, University of Dundee, Dundee, DD1 4HN, Scotland

    David Mitchell Goldie

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  1. David Mitchell Goldie
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Correspondence to David Mitchell Goldie.

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Goldie, D.M. Transient bleaching pulse shapes in electrochromic polysiloxane thin films. J Mater Sci 43, 1818–1824 (2008). https://doi.org/10.1007/s10853-007-2397-9

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