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Quality assessments of electrochromic devices: the possible use of 1/f current noise

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Abstract

Electrochromic (EC) devices, capable of modulating their optical transmittance by charge insertion/extraction, were produced by laminating films comprised of nanoporous W oxide and Ni–V oxide by a polymer electrolyte and having this three-layer stack between transparent conducting In2O3:Sn films backed by polyester foils. 1/f noise in the current (I) was observed when the charged (colored) EC device was discharged via a resistor. The power spectral density S i at fixed frequency scaled as S i  ∼ I 2. Extended color/bleach cycling degraded the optical quality and homogeneity of the device and concomitantly increased the 1/f noise intensity. These initial data indicate that 1/f noise has a potential to serve as a quality measure for EC devices.

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Acknowledgment

J. Smulko’s research at the Uppsala University was supported by the Swedish Foundation for International Cooperation in Research and Higher Education via a STINT short-term stipend.

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Authors and Affiliations

  1. Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, ul. G. Narutowicza 11/12, 80-952, Gdańsk, Poland

    J. Smulko

  2. ChromoGenics Sweden AB, Märstagatan 4, 75323, Uppsala, Sweden

    A. Azens

  3. Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, 77843-3128, USA

    L. B. Kish

  4. Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, P.O. Box 534, 75121, Uppsala, Sweden

    C. G. Granqvist

Authors
  1. J. Smulko
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  2. A. Azens
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  3. L. B. Kish
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  4. C. G. Granqvist
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Correspondence to C. G. Granqvist.

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Smulko, J., Azens, A., Kish, L.B. et al. Quality assessments of electrochromic devices: the possible use of 1/f current noise. Ionics 13, 179–182 (2007). https://doi.org/10.1007/s11581-007-0088-9

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  • DOI: https://doi.org/10.1007/s11581-007-0088-9

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