Electrochromic Performance of V2O5 Thin Films Grown by Spray Pyrolysis

Abstract

A new approach regarding the development of nanostructured V2O5 electrochromic thin films at low temperature (250 °C), using air-carrier spray deposition and ammonium metavanadate in water as precursor is presented. The obtained V2O5 films were characterized by X-ray diffraction, scanning electron microscopy and Raman spectroscopy, while their electrochromic response was studied using UV-vis absorption spectroscopy and cyclic voltammetry. The study showed that this simple, cost effective, suitable for large area deposition method can lead to V2O5 films with large active surface for electrochromic applications.

High-Coloration Efficiency and Low-Power Consumption Electrochromic Film based on Multifunctional Conducting Polymer for Large Scale Smart Windows

“…Previous studies using conducting polymers for ECD have operated electro-polymerization for preparing EC conducting polymer films, they are not suitable for fabricating large-area coatings. Other preparation methods for EC materials, such as "vacuum sputtering", 19 "chemical bath deposition", 20 "sol−gel process", 21 "pulse laser deposition", 22 and "spray Pyrolysis", 23 have been investigated to improve electrochromic devices. Although a good electrochromic performance, these processes for EC films should overcome the requirement for high temperature conditions to manufacture large-area devices.…”

Electrochromic Behavior of Vanadium Pentoxide Thin Films Prepared by a Sol–Gel Spin Coating Process

“…The calculated values of coloration efficiency are in good agreement with the literature reports. [12,58] [59] In addition, the radio frequency magnetron sputter-deposited Nb 2 O 5 films showed the coloration efficiency of 53 cm 2 C À1 . [60] Furthermore, the η of 77 cm 2 C À1 was reported for V 2 O 5 films deposited by dip coating technique.…”

“…The calculated values of coloration efficiency are in good agreement with the literature reports. [12,58] Table 4 shows the comparison of coloration efficiency of various electrochromic materials along with V 2 O 5 films available in the literature. Interestingly, it is observed that the V 2 O 5 films prepared in the current work have highest coloration efficiency compared with other reports.…”

“…For instance, Kyriakos et al reported that the spray‐deposited V 2 O 5 films with postannealing treatment at 400 °C exhibited the coloration efficiency ( η ) value of 20 cm 2 C −1 . [ 12 ] Alsawatfa et al investigated the electrochromic properties of sol–gel‐deposited V 2 O 5 thin film and concluded that the annealing temperature is an influencing factor for electrochromic behavior to obtain the maximum coloration efficiency of 77 cm 2 C −1 . [ 10 ] It is worthwhile to mention here that the quantitative parameters of electrochromic properties (especially the coloration efficiency) of V 2 O 5 films strongly depend on the structural (crystallinity), morphology, and compositional behavior which, in turn, depend on the preparation technique/parameter.…”

Special Issue: Advances in Chemical Vapor Deposition

“…This process can result in materials with enhanced electrochemical performance for electrochromic applications combined in layered and composite forms for higher reflective property, electrochemical stability and faster electrochromic response [12,13]. In Mouratis et al's letter [14], a new approach regarding the development of V 2 O 5 electrochromic thin films at 250 • C using ammonium metavanadate in water as precursor is shown. The precursor concentration can affect the morphology of the oxides, resulting in a large active surface area suitable for electrochromic applications.…”