Ta$_2$O$_5$ 박막전해질 EC 창의 전기화학 및 광학적 특성에 관한 연구

Electrohemical and optical properties of Ta$_2$O$_5$ thin film electrolyte EC windows

Tantalum oxide thin filme has an amorphous structure and a high resistivity. Its stoichiometric structure was $Ta_2O_{5.3}$ and the transmission ratio was 80%. The high resistivity of $Ta_2O_{5.3}$ thin film electrolyte made an EC windows without electrical shottness, but the bleached/colored cur rent was very low because of the low ion conductivith. Upon adding moisture into the system, the $\Delta$T increased upto 25 %. proton concentration increase was the main cases to improve optical property. The influence of adding precious or transition metal film(~100 $\AA$ thickness) in $Ta_2O_5$layer on the color change performance was observed. The metal insertion layers had formed hydroxide and they behaved as a stable proton source. The transmission diffrnece and cycle life were greatly enhanced in the case of Ti inssertion.The $\Delta$T was 50% and the cycle life was 18, 000.