Effect of post-annealing on structural and electrochromic properties of Mo-doped V2O5 thin films

Abstract

The effect of post-annealing on the structural and electrochromic properties of the Mo-doped V 2 O 5 thin films was investigated in this paper. With varying the annealing temperature, the interlayer distance is increased from 1.16 (as-deposited) to 1.38 nm (annealing at 250°C), and the enlarged interlayer spacing would facilitate ion movement in between the interlayers inside the electrochromic matrix. Therefore, both the optical modulation and color efficiency of the Mo-doped V 2 O 5 thin films are enhanced after appropriate post-annealing treatment. Our results demonstrate that Mo-doped V 2 O 5 material is one of the promising candidates to be used in multi-color electrochromic devices. Graphical Abstract The ability to modulate optical transmittance of the Mo-doped V 2 O 5 thin films is greatly enhanced by means of the larger interlayer distance after annealing.

Flexible Electrochromic V2O5Thin Films with Ultrahigh Coloration Efficiency on Graphene Electrodes

“…Also, the V 2 O 5 thin films on Graphene exhibited nano-crystalline characteristics with several crystallographic planes and diffraction rings of (001), (124), and (0010) in the previous report 28 and the nano-crystalline nature of V 2 O 5 thin films was similar to us. In contrast, in our previous investigation, 29 no diffraction rings are observed in the V 2 O 5 thin films on ITO electrodes fabricated by the electrochemical deposition method using a conventional three-electrode system from a fully aqueous V 2 O 5 precursor solution. In the present work, the ethanol V 2 O 5 precursor solution, Graphene substrate, and the two-electrode system were utilized to synthesize the V 2 O 5 thin films, which makes the microstructure different between the V 2 O 5 thin films prepared by two different deposition methods.…”

Mo addition for improved electrochromic properties of V2O5 thick films

“…To solve this issue, considerable strategies have been proposed, such as reducing particle size, pore engineering, and modification by doping or coating to improve their stability and electronic conductivity [30,31]. Moreover, it has been demonstrated that the mixed-valence vanadium (molybdenum) oxides can provide readily accessible redox couples, which make them attractive for reversible delithiation/lithiation and also greatly shorten the transport path lengths of lithium ions and electrons during the delithiation/lithiation processes, thus leading to a significant improvement of the electrochemical performance [32][33][34]. There are several reports on the titanium, niobium and molybdenum doped V2O5 films deposited by different techniques [35,36].…”

Plasma Modified V2O5/PEDOT Hybrid Based Flexible Electrochromic Devices

“…There are some works onto improvements of optical properties of V 2 O 5. Young et al [12] prepared Modoped V 2 O 5 thin films to boost the electrochromic performance by electrochemical deposition method and investigated annealing process effect of electrochromic film. In another work, Lin et al [10] compared performances of single V 2 O 5 and NiO/V 2 O 5 hybrid film, and obtained good stability, higher coloration efficiency (30.6 C À1 cm 2 ) and better transmittance modulation.…”