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Vanadium pentoxide (V2O5) thin films were grown on indium tin oxide-coated flexible Kapton substrates by home-built activated reactive evaporation technique. Film depositions were carried out at optimised oxygen partial pressure of 1 × 10−3 Torr and plasma power of 8 W, and we investigated their microstructural and opto-electrochromic properties as a function of substrate temperature. The V2O5 films grown at Ts = 473 K exhibited a nano-crystalline nature as evidenced from X-ray diffraction, atomic force microscopy and Raman studies. The nano-crystalline films composed of vertical elliptical-shaped grainy morphology demonstrated a high optical transmittance of 75% with an estimated optical bandgap of 2.38 eV. The dry lithiated nano-crystalline V2O5 films demonstrated an optical modulation of 36.1% with a coloration efficiency value of 26.2 cm2/C at a wavelength of 550 nm. As-deposited nano-crystalline V2O5 thin films demonstrated a constant discharge capacity of about 60 μAh cm−2 μm−1 for a few cycles at room temperature in the potential window of 4.0 to 2.5 V.

Spectroscopic and electrochromic properties of activated reactive evaporated nano-crystalline V2O5 thin films grown on flexible substrates