脉冲激光沉积制备氧化铋薄膜的电致变色性质

Electrochromic Properties of Bismuth Oxide Thin Films Prepared by Reactive Pulsed Laser Deposition

通过电位阶跃和循环伏安结合现场电感偶合分光光度计(CCD)测量了脉冲激光沉积的四方结构Bi_2O_3薄膜的电致变色性质.结果表明,在波长为630 nm处出现一个明显的吸收峰,Bi_2O_3薄膜电极的着色时间为30s.吸光度-电位谱图表明,当电位在3.5-0.7 V之间变化时,Bi_2O_3薄膜的颜色可明显地呈现由透明到暗棕色的可逆变化,重复次数可达50次,在630 nm测得的着色效率约为15 cm^2·C^(-1).

The electrochromic behaviors of the tetragonal Bi203 films deposited by pulsed laser deposition at 300 ℃ were investigated by potential step and cyclic voltammetry coupled with an in situ charge-coupled device （CCD） spectrophotometer. The time-resolved absorption spectrum determined by potential step method indicated that the coloration time for Bi2O3 film was estimated to be 30 s. In addition, the electrochromic properties determined by cyclic voltammetry showed that this film could exhibit a significantly reversible variation between transparent and dark brown more than 50 times on switching between 3.5 and 0.7 V. The color efficiency at 630 nm was estimated to be 15 cm^2. C^-1.