Hydrothermally grown nano and microstructured V2O5 thin films for electrochromic application

In the present work, V2O5 films were deposited by hydrothermal method at 230 degrees C for the deposition time of 4 h and 8 h and then annealed at 500 degrees C for 1 h and 2 h. X-ray diffraction pattern of the films deposited at 230 degrees C (4 h and 8 h) and annealed at 500 degrees C (1 h and 2 h) show orthorhombic system of V2O5. Further, scanning electron microscope images confirmed the growth of nanorods and microspheres formed with ring pattern containing nanorods. The average visible transmittance of the films deposited for a period of 4 h and annealed at 500 degrees C for 1 h and 2 h showed relatively high transmittance. The optical band gap of the deposited films is in the 2.34-2.46 eV range. The film prepared at 230 degrees C for 4 h and annealed at 500 degrees C for 1 h and 2 h showed relatively high carrier concentration and low resistivity and the film annealed at 500 degrees C for 1 h showed relatively high redox peak current density and diffusion coefficient when compared to the values of other films. (C) 2018 Elsevier B. V. All rights reserved.