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Capturing ion trapping and detrapping dynamics in electrochromic thin films

Author

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  • Renfu Zhang

    (Southern University of Science and Technology)

  • Qinqi Zhou

    (Southern University of Science and Technology)

  • Siyuan Huang

    (Southern University of Science and Technology)

  • Yiwen Zhang

    (Southern University of Science and Technology)

  • Rui-Tao Wen

    (Southern University of Science and Technology
    Southern University of Science and Technology)

Abstract

Ion trapping has been found to be responsible for the performance degradation in electrochromic oxide thin films, and a detrapping procedure was proved to be effective to rejuvenate the degraded films. Despite of the studies on ion trapping and detrapping, its dynamics remain largely unknown. Moreover, coloration mechanisms of electrochromic oxides are also far from clear, limiting the development of superior devices. Here, we visualize ion trapping and detrapping dynamics in a model electrochromic material, amorphous WO3. Specifically, formation of orthorhombic Li2WO4 during long-term cycling accounts for the origin of shallow traps. Deep traps are multiple-step-determined, composed of mixed W4+-Li2WO4, amorphous Li2WO4 and W4+-Li2O. The non-decomposable W4+-Li2WO4 couple is the origin of the irreversible traps. Furthermore, we demonstrate that, besides the typical small polaron hopping between W5+ ↔ W6+ sites, bipolaron hopping between W4+ ↔ W6+ sites gives rise to optical absorption in the short-wavelength region. Overall, we provide a general picture of electrochromism based on polaron hopping. Ion trapping and detrapping were demonstrated to also prevail in other cathodic electrochromic oxides. This work not only provides the ion trapping and detrapping dynamics of WO3, but also open avenues to study other cathodic electrochromic oxides and develop superior electrochromic devices with great durability.

Suggested Citation

  • Renfu Zhang & Qinqi Zhou & Siyuan Huang & Yiwen Zhang & Rui-Tao Wen, 2024. "Capturing ion trapping and detrapping dynamics in electrochromic thin films," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46500-8
    DOI: 10.1038/s41467-024-46500-8
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    References listed on IDEAS

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