Preparation Of Fluorine And Niobium Co-doped TiO₂ Array-amorphous WO₃ Composite Films And Their Electrochromic Properties

Electrochromism refers to the phenomenon that materials absorb or scatter light under the action of electric current or electric field,which causes reversible changes in color or transmittance.Single electrochromic materials often have insufficient performance,so composite electrochromic materials have gradually become a research hotspot In this paper,the goal is to prepare the "fluorine-niobium co-doped titanium dioxide array-amorphous tungsten oxide1" electrochromic composite film with visible-near-infrared zone control ability,and the preparation of high carrier concentration fluorine-niobium co-doped titanium dioxide film,fluorine-niobium co-doped titanium dioxide array processing,fluorine-niobium co-doped titanium dioxide array-amorphous tungsten oxide composite film preparation and its microstructure and performance characterization,the specific work is as follows:1.The fluorine-niobium co-doped titanium dioxide film was prepared on a soda lime glass substrate by the sol-gel method,and the influence of fluorine doping content on the microstructure,chemical composition and photoelectric properties of the fluorine-niobium co-doped titanium dioxide film was studied.When the atomic ratio of titanium to fluorine is 1:0.5,a fluorine-niobium co-doped titanium dioxide film with better performance is prepred.The carrier concentration is 1.15×1021 cm-3,the average visible light transmittance is 81%,and the resistivity is 0.02 Ω·cm.2.In order to obtain a high-performance near-infrared modulated electrochromic film a fluorine-niobium co-doped titanium dioxide array was prepared by laser interference combined with a photosensitive sol-gel method,and the influence of the array structure parameters on its electrochromic performance was studied.When the grid point height is 120 nm and the grid point diameter is 350 nm,the prepared fluorine-niobium co-doped titanium dioxide array film has the best electrochromic performance,with ΔT of 32%in the visible light region,ΔOD of 0.2 and near-infrared ΔT of 80%,ΔOD is 1.1.3.In order to further improve the modulation ability of the fluorine-niobium co-doped titanium dioxide array in the visible light region,in this paper,an amorphous tungsten oxide film is coated on the fluorine-niobium co-doped titanium dioxide array,and the superior optical modulation ability of the amorphous tungsten oxide is used to enhance the electrochromic composite film performance.The results showed that the composite film has excellent visible-near-infrared zone control ability,with a visible light range of ΔT of 60%and ΔOD of 0.9;near-infrared band ΔT of 82%and ΔOD of 1.4.Compared with the optimal fluorine-niobium co-doped titanium dioxide array film,the near-infrared ΔT increased by 2%,and the ΔOD increased by 30%;the visible region ΔT increased by 28%,and the ΔOD increased by 350%.