TRANSMISSION PROPERTIES FOR INDIVIDUAL ELECTROCHROMIC LAYERS IN SOLID-STATE DEVICES BASED ON POLYANILINE, PRUSSIAN-BLUE AND TUNGSTEN-OXIDE

In order to investigate the transmission properties in the whole solar spectrum for individual electrochromic layers in solid state devices incorporating polyaniline (PANI), Prussian Blue (PB) and tungsten oxid e (WO3), the devices were fabricated with and without holes in the ele ctrochromic coatings in several combinations. Both PANI and WO3 were d eposited electrochemically on indium-tin oxide (ITO) glass substrates, while PB was deposited on top of the PANI coatings or directly on the ITO glass plates. Solid state devices were made by gluing the glass p lates together with the solid polymer electrolyte poly(2-acrylamido-2- methyl-propane-sulphonic acid) (PAMPS), and thus, with and without hol es in the three electrochromic coatings in different combinations, ena bling us to study the optical properties of PANI, PB and WO3 separatel y, that is, the 'hole' method. This method gives good qualitative, and to a certain degree quantitative, information, which may be of valuab le help in designing electrochromic devices with specific tailor-made optical properties.