Abstract
Vanadium dioxide thin films nanostructures were synthesized by pulsed laser deposition on soda lime glass at a substrate temperature of 600°C and the effects of the oxygen deposition pressure on the crystalline structure and the phase transition characteristics of VO2 nanostructured films were investigated. The structure and microstructure of the films have been examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results indicate that the crystal structure of the films is strongly sensitive to the oxygen deposition pressure; exhibiting sharp a-axis diffraction peaks, showing a texturation along (1 0 0) plane. A detailed description of the growth mechanisms and the substrate–film interaction is given, and the characteristics of the electronic transition and hysteresis of the phase transition are described in terms of the morphology, grain boundary structure and crystal orientation. The sharpness of the transition and the hysteresis upon heating and cooling are found to be strong functions of the crystal structure and microstructure (grain size).
Highlights
Large number of transition metal oxides and sulphides are semi-conducting and metallic at low temperatures and high temperatures, respectively [1]
In this paper we report on pulsed laser deposition (PLD)-grown thin films, with a-axis orientation, influenced by the oxygen deposition pressure
It should be noted that the multiple valence states of vanadium ions lead to several vanadium oxide phases such as Magneli phases (VnO2n−1) and Wadsley phases (V2nO5n−2), no other peak corresponding to any other vanadium oxide phases mentioned is present in the X-ray diffraction (XRD) spectra, indicating the exclusive formation of single-phase VO2 films on the glass substrate
Summary
Large number of transition metal oxides and sulphides are semi-conducting and metallic at low temperatures and high temperatures, respectively [1]. As a consequence of such a femtosecond electronic/ crystallographic and reversible SMT phase transition, the optical dielectric constant and the refractive index of VO2 exhibits a temperature modulation, which translates in a large reversible optical properties This singular and unique property of VO2 makes it a multifunctional optical candidate of choice for smart windows applications, optical switching devices, field effect transistors, ultrafast. As the hysteresis nature and mechanism in VO2 are still an open question, which is interesting from a basic research viewpoint This contribution will shed light on the effect of oxygen deposition pressure on the structural and micro-structural properties of the VO2 thin films and on its hysteresis characteristics and transition temperature
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