Abstract
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.
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