Effects of oxygen stoichiometry on electrochromic properties in amorphous tungsten oxide films

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• 作者：Akbar I. Inamdar^a ; Y.S. Kim^a ; B.U. Jang^a ; Hyunsik Im^a ; ^{hyunsik7@dongguk.edu} ; Woong Jung^a ; Dae-Young Kim^b ; Hyungsang Kim^c
• 关键词：Tungsten oxide ; Sputtering ; Electrochromic properties
• 刊名：Thin Solid Films
• 出版年：2012
• 期刊代码：78_00406090
• 类别：ph
• 出版时间：1 June, 2012
• 卷：520
• 期：16
• 页码：5367-5371
• 文件大小：722 K

摘要

We have investigated the electrochromic properties of amorphous granular tungsten oxide (WO_3 + 未) thin films with over-stoichiometric oxygen content (未), using LiClO₄ with propylene carbonate as an electrolyte. Different optical and electrochromic characteristics are observed with increasing 未. All the devices are electrochemically stable for more than 5000 color/bleach cycles without apparent degradation, and they have a faster response to coloration than to bleaching. WO_3 + 未 films with an optimized 未 value show an optical modulation of 86%at a wavelength of 630 nm and the highest coloration efficiency ever reported of ~ 213 cm²/C. The 未-dependent coloration mechanism is discussed using the site saturation model. It is proposed that WO_3 + 未 films with the optimal 未 value have favorable thickness and stoichiometry for the generation of Li⁺W⁺⁵ states.