Smart Windows with Different Thicknesses of V2O5 as Ion Storage Layers
Smart windows were fabricated with different thicknesses of amorphous V2O5, which acts as an ion storage layer. In these devices, V2O5 was deposited by thermal evaporation at a substrate temperature of 200 oC, and an electrochromic layer (WO3) was deposited by electron beam evaporation at a substrate temperature of 250 oC. Both layers were amorphous. V2O5 was found to exhibit direct-forbidden electron transitions, whereas the WO3 layer exhibited indirect-allowed electron transitions. An increase in the thickness of V2O5 from 78 nm to 313 nm reduced the colouration efficiency from 64 to 48 cm2/C, and the time of the transmission variation curve from the coloured state to the bleached state was increased from 82.41 s to 558 s.
Yuan Ming Huang
S. N. Alamri and A. A. Joraid, "Smart Windows with Different Thicknesses of V2O5 as Ion Storage Layers", Materials Science Forum, Vols. 663-665, pp. 743-750, 2011