Spray Deposited V2O5 Conductive Thin Films for Electrochromic Devices
K. Mouratis1,3, I. V. Tudose1, M. Kirmizaki1, C. Pachiu2, C. Romanitan2, F. Comanescu2, O.N. Ionescu2, S. Couris3, E. Koudoumas2, M. Suchea 1,2*
1 - Center of Materials Technology and Photonics, Hellenic Mediterranean University, 71004, Heraklion, Crete, Greece
2 - National Institute for Research and Development in Microtechnologies (IMT-Bucharest), 126 A, Erou Iancu Nicolae Street, P.O. Box 38-160, 023573 Bucharest, Romania
3 - Department Of Physics, University of Patras, Rio Achaia, Greece
Abstract: Used for more than 135 years, vanadium pentoxide (V2O5) holds promise as an electrode material for lithium batteries and electrochromic devices, due to its high lithium ion intercalation. Its fascinating properties and wide application range of V2O5 thin films have attracted significant attention over the past decades. V2O5 has a wide optical band gap, layered structure, good chemical and thermal stability and excellent thermoelectric and electrochromic properties
However, it remains challenging to make uniform, large-scale thin films. We prepared V2O5 films by spraying a precursor solution of metavanadate onto FTO coated glass obtaining nanostructured thin films with excellent morphology, electric, optic and electrochromic properties. Compared with other V2O5 films, sprayed films exhibited similar transmittance values and comparable charge storage capacity. Unlike other V2O5 films, ours shows a reproducilble structuring consisting on wall-like structures grown onto granular uniformely distributed grains fact that increases drastically their active surface. The advantages in both cost and control make our growth method very suitable for preparing large-area films for electrochromic devices.