In this study, a WO 3 film with controllable crystallinity has been prepared by radio frequency magnetron sputtering. The WO 3 film with about 400 nm thickness and controllable crystallinity not only has the advantages of amorphous WO 3 with large transmittance modulation and short switching response time but also has the outstanding cyclic stability of crystalline WO 3 . Therefore, this WO 3 film exhibits superior electrochromic performances including large transmittance modulation in the near infrared regime (72.5% at λ = 1000 nm), short coloration/bleaching switching response time (5.3 s for coloration and 3.0 s for bleaching), high coloration efficiency at λ = 1000 nm (80.5 cm 2 C −1 ), and excellent cycle stability. The strategy of preparing a WO 3 film with controllable crystallinity by a simple magnetron sputtering method presents an innovative direction to obtain high-performance WO 3 electrochromic materials applied in the fields of smart windows, spacecraft thermal control, and infrared camouflage.

A high performance ECD with a structure of glass/ITO/WO3/LiF/NiO/ITO has been prepared by electron beam and resistance evaporation methods.

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