Electrochromic Property of Sputtered Amorphous NiO Films

Abstract:

Nickel oxide (NiO) thin films were deposited on ITO/glass substrates by radio frequency magnetron sputtering. The electrochromic property of NiO films was investigated using cyclic voltammograms (CV), performed on NiO films immersed in an electrolyte of 1 M LiClO₄ in propylene carbonate (PC). Optical, electrochemical and structural properties of the films, as a function of coloration–bleaching cycle, were characterized using an UV-Vis-NIR spectrophotometer, cyclic voltammetry (CV), X-ray diffraction(XRD) and a field emission scanning electron microscope (FE-SEM). The optimal electrochromic NiO film, with a thickness of 180 nm, exhibits a maximum transmittance variation (ΔT%) of 53.97 %, an optical density change (ΔOD) of 0.66, an intercalation charge (Q) of 14.65 mC/cm², and a coloration efficiency (η) of 44.85 cm²/C between the colored and bleached states at a wavelength (λ) of 550 nm.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 1685-1689
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.1685
• Online since: May 2013
• Authors: Chih Ming Wang, Chih Yu Wen, Ying Chung Chen, Shih Yuan Lin, Shiu Ting Shiau
• Keywords: Coloration Efficiency, Electrochromic, Nickel Oxide (NiO), Sputtering Power

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