Journal of Applied Electrochemistry

, Volume 29, Issue 9, pp 1103–1110 | Cite as

Correlation between light absorption and electric charge in solid state electrochromic windows

  • B.P. Jelle
  • G. Hagen


Electrochromic windows based on different combinations of the electrochromic materials polyaniline (PANI), Prussian Blue (PB) and tungsten oxide (WO3), with the solid state polymer electrolyte poly(2-acrylamido-2-methyl-propane-sulphonic acid) (PAMPS) as an ionic conductor, have been studied. These windows show a large transmission regulation both in the visible and in the near infrared wavelength region. Integrated over the solar spectrum, wind\ws with PB deposited on top of PANI, with WO3 as a complementary coating, are typically able to regulate as much as 50% of the total solar radiation. The relationship between light absorption and charge extraction in electrochromic windows has been studied. The windows are coloured by applying a potential, which is then switched off, and the discharge process is followed by continuously measuring the light absorption and the charge extraction through a connected resistor. From the resulting linear relationship between the absorption and charge extraction, the overall absorption coefficient may be calculated.

absorption coefficient electrochromic efficiency polyaniline Prussian Blue tungsten oxide 


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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • B.P. Jelle
    • 1
  • G. Hagen
    • 1
  1. 1.Department of ElectrochemistryNorwegian University of Science and Technology (NTNU)TrondheimNorway

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