Glancing angle sputter deposited tungsten trioxide (WO3) thin films for electrochromic applications

Naveen Kumar, K and Shaik, H and Madhavi, V and Imran Jafri, R and Gupta, J and Nithya, G and Sattar, SA and Ashok Reddy, GV (2022) Glancing angle sputter deposited tungsten trioxide (WO3) thin films for electrochromic applications. In: Applied Physics A: Materials Science and Processing, 128 (11).

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Abstract

The columnar growth angle-dependent tungsten oxide (WO3) thin films were grown by using the Glancing angle sputter deposition (GLAD) technique with varying different substrate angles (00, 700, 750, and 800) on Fluorine-doped tin oxide (FTO) and Corning glass (CG) corning glass substrates at room temperature. The surface morphology, crystallographic structure, optical, and electrochemical properties were determined using X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Ultraviolet–Visible (UV–Vis) spectrometer, and electrochemical analyzer, respectively. The structural properties reveal that the films are amorphous in nature. FE-SEM studies observed the columnar growth of the nano-rods and surface porosity. The optical transmittance of the deposited films was decreased from 83 to 78%, and the optical bandgap decreased from 3.08 to 2.88 eV with increasing GLAD angle. The electrochemical studies reveal that the GLAD angle influenced the coloration efficiency (CE). The highest CE of 32 cm2/C at 600 nm and highest Diffusion coefficient (DC) of 6.529 × 10–9 cm2 s−1 of the films was observed for the films deposited at an angle of 750.

Item Type:	Journal Article
Publication:	Applied Physics A: Materials Science and Processing
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to Springer Science and Business Media Deutschland GmbH.
Keywords:	Deposition; Diffusion; Efficiency; Electrochromism; Enamels; Field emission microscopes; Glass substrates; ITO glass; Morphology; Nanocomposites; Nanorods; Scanning electron microscopy; Surface morphology; Thin films; Tin oxides, Coloration efficiencies; Columnar-growth; Corning glass; Deposition angle; Field emission scanning electron microscopy; Glancing Angle Deposition; Glancing angle sputter depositions; Thin-films; Transmittance; Tungsten oxide films, Tungsten compounds
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Date Deposited:	10 Nov 2022 05:41
Last Modified:	10 Nov 2022 05:41
URI:	https://eprints.iisc.ac.in/id/eprint/77814

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