ELECTROCHROMIC DEVICE DESIGN AND FABRICATION INCLUDING NB2O5 THIN FILMS AS A CATHODIC LAYER

9th International Physics Conference of the Balkan Physical Union, İstanbul, Türkiye, 24 - 27 Ağustos 2015, ss.246, (Özet Bildiri)

ELECTROCHROMIC DEVICE DESIGN AND FABRICATION INCLUDING

NB2O5 THIN FILMS AS A CATHODIC LAYER

ÖZLEM DUYAR COŞKUN

Physics Engineering Department, Hacettepe University, Ankara 06800, Turkey,

duyar@hacettepe.edu.tr

Nb2O5 films have recently attracted considerable attention for electrochromic devices because of their

crystal-structure-dependent electrochromic properties.

Nb2O5 films were deposited on ITO coated glass substrates using RF magnetron sputtering technique in

an argon atmosphere. TT and T phase of Nb2O5 were obtained by annealing in air.

The Nb2O5 films work as an intercalation host for the Li ions, so their colours become blue during the

intercalation. The optical modulation of TT- Nb2O5 film which has a pseudo hexagonal structure became

apparently higher, by 59.4% at 1000 nm with a coloration efficiency of 8.84 cm2/C. The maximum

colouration efficiency of 19.56 cm2/C at 550 nm was obtained for T-Nb2O5 which had a layered

orthorhombic structure. Transition metal oxides with the layered crystalline structures have an ability to

intercalate ions in a wide range of sites, so cations intercalate into the interlayer gaps called van der

Waals gaps of a layered material.