Tunable Optical Constants of Aluminum Tungsten Bronzes in Electrochromic Tungsten Oxide Thin Films
Tunable Optical Constants of Aluminum Tungsten Bronzes in Electrochromic Tungsten Oxide Thin Films
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DOI：
10.1021/acs.jpcc.3c03521
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发表时间：
2023-09
期刊：
影响因子：
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通讯作者：
Kunrun Song;Shichen Weng;Jumei Zhou;Ran Jiang;H. Cao;Hongliang Zhang
中科院分区：
文献类型：
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作者：
Kunrun Song;Shichen Weng;Jumei Zhou;Ran Jiang;H. Cao;Hongliang Zhang
铝钨青铜（AlxWO 3）作为光调制的核心层在电致变色器件中具有重要意义。与其它电致发光性质相比，对AlxWO 3光学常数的研究尚属空白。利用椭圆偏振光谱仪研究了AlxWO 3薄膜在不同电位下的可调光学常数。我们的研究结果表明，在光学常数方面，AlxWO 3层表现出更大的调制在更广泛的电压范围内，并具有更好的调制能力比HxWO 3和LixWO 3。随着AlxWO 3的生成，WO 3薄膜的厚度增加了2.12%，从漂白态到完全着色态，其光学带宽度减小了0.26 eV.铝钨青铜的大光学常数调制能力使其能够在较低的施加电压条件下实现与锂离子系统相当的调制能力。此外，扩展的调制范围进一步增强了其在电子、光学和其他器件中的潜在应用。这些结果有望为理解电致变色原理和设计新型电致变色器件提供很大帮助。
Aluminum tungsten bronze (AlxWO3) as the core layer for optical modulation is of great significance to electrochromic (EC) devices. Compared with other EC properties, there remains a vacancy in the study of optical constants of AlxWO3. Herein, the tunable optical constants of AlxWO3layers under varying potentials are investigated via a spectroscopic ellipsometer. Our findings indicate that in terms of optical constants, the AlxWO3layer exhibits greater modulation over a more extensive voltage range and has better modulation ability than HxWO3and LixWO3. With the generation of AlxWO3, the WO3thin films exhibit a 2.12% increase in thickness and a 0.26 eV decrease in the optical band from the bleached to the fully colored state. The large optical constant modulation capability of aluminum–tungsten bronze enables it to achieve comparable modulation capability to that in a lithium-ion system but at lower applied voltage conditions. Furthermore, the expanded modulation range further enhances its potential applications in electronic, optical, and other devices. These results are expected to offer great assistance in understanding the coloration principle and the design of novel EC devices.