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- Title
Effect of H2Te2O6 and TeO2 phases on structural and electrochromic properties of WO3–TeO2 nanostructured binary thin films.
- Authors
Shirpay, A.; Mohagheghi, M. M. Bagheri
- Abstract
In this paper, WO3–TeO2 binary thin films were deposited by spray pyrolysis. By changing the stoichiometry between WO3 and TeO2 in initial solution, three samples with various molar ratios were prepared including: (a) WO3 (0.15 M)–TeO2 (0.05 M), (b) WO3 (0.1 M)–TeO2 (0.1 M), and (c) WO3 (0.05 M)–TeO2 (0.15 M). Then, deposited binary thin films were characterized by XRD, FE-SEM, and I–V cyclic voltammetry to study electrochromic and coloration properties of the thin films before and after annealing at T = 500 °C. The XRD analysis of the samples shows the formation of the H2Te2O6 phase with the preferred peak of (2 0 0), which increased with TeO2 content after annealing. The WO3–TeO2 thin films were used as a binary combination of n-type (WO3) and p-type (TeO2) semiconductors to investigate the change in electrochromic properties before and after annealing at T = 500 °C. The results of the hysteresis I–V curve of the WO3–TeO2 binary combination showed that by increasing the H2Te2O6 phase, the electron–hole exchange and, consequently, the coloration/bleaching process are improved. The area under the hysteresis curve varies in the range of 11.02 × 10 - 3 to 88.32 × 10 - 3 A.V. The diffusion coefficient also varies in the range of 1.96 × 10 - 12 to 7.09 × 10 - 12 cm2/s.
- Subjects
CYCLIC voltammetry; DIFFUSION coefficients; N-type semiconductors; BLEACHING (Chemistry); STOICHIOMETRY; THIN films; HYSTERESIS
- Publication
Journal of Materials Science, 2021, Vol 56, Issue 26, p14644
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-021-06233-1