Electrochromic properties of tungsten trioxide (WO3) layers grown on ITO/glass substrates by magnetron sputtering. (October 2015)

• Record Type: Journal Article
• Authors: Tuna, Ö.; Sezgin, A.; Budakoğlu, R.; Türküz, S.; Parlar, H.
• Is Part Of: Vacuum. Volume 120(2015)Part B
• Page Start: 28
• Page End: 31
• Publication Date: 2015-10
• Subjects: DC sputtering -- Electrochromic -- WO3 -- TCO; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2015.02.036
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: WO3 layers were grown on glass substrates by pulsed DC magnetron sputtering. A series of WO3 layers were deposited at different growth powers changing from 0.7 kW to 1.5 kW. The effects of the growth power on the electrochromic properties of WO3 thin films were investigated. By using X-ray diffractometry, it was obtained that WO3 thin films had amorphous crystal structure. Electrochromic measurements were studied by cyclic voltmeter, chronoamperometry and lifetime cycle measurements. An increase in the coloration efficiency from 55 cm 2 /C to 87 cm 2 /C was found with decreasing growth power. Moreover, the decrease in the growth power leads to a decrease in the coloration and bleaching times from 11.75 s to 5.93 s and from 17.35 s to 9.69 s, respectively. All the changes in the coloration efficiency and coloration and bleaching times with a decrease in growth power could be explained by the kinetics of electrochromic reactions. This is associated with the density of the WO3 thin films which is increasing from 7.06 g/cm 3 to 7.59 g/cm 3 by increasing the growth power from 0.7 kW to 1.5 kW. Highlights: The influence of growth power on electrochromic properties was investigated. An increase with coloration efficiency with a decrease in growth power was observed. A decrease in film density with decreasing the growth power was realized. Coloration efficiency of as high as 85 cm 2 /C was recorded.