Electrochromic Investigation of Manganese Oxide Thin Films by Spray Pyrolysis Technique

Thin films of MnO2 are well suited for Electrochromic Photo-Voltaic (ECPV) effect and superconducting phenomenon (such as solar cells) due to its electrical, optical and electrochromic properties. MnO2 thin films were prepared on glass substrate using a simple and low-cost chemical spray pyrolysis technique at different substrate temperature. The MnO2 films were characterized by X-ray diffraction (XRD), transmittance, ultraviolet-visible (UV-VIS) optical spectroscopy and colouration efficiency. The XRD pattern reveals that MnO2 films possess cubic structure. Transmittance activity of the sample was carried out by optical absorption studies. The indirect band gap of the material increases with increase in temperature. The dynamic of ion exchange was studied with CV, CA and CC. The maximum colouration efficiency observed is 17 cm2/C.