Amorphous Bi-doped WO3 thin film with a dominant orientation for superior electrochromic performances

Jin You Zheng*, Qimeng Sun, Shuang Yu, Huijing Yang, Xiaomei Yu and Songjie Li

Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education, School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China.

Tungsten trioxide (WO3) film is commonly used to create electrochromic devices since it is one of the most promising electrochromic materials with good electrochemical properties. Here, we synthesize amorphous Bi-doped WO3 (Bi-WO3) films with improved electrochromic (EC) performance utilizing a straightforward sol-gel approach. With the right Bi element doping quantity and thickness, the EC performances can be greatly enhanced. High optical contrast (T = 73.06% at 630 nm), quick switching time (3.6/1.4 s for coloring and bleaching at 630 nm), and high coloration efficiency (52.52 cm2/C at 630 nm) were all features of the optimized Bi-WO3 hybrid film that contributed to its remarkable electrochromic performance. The fascinating EC performance of the film can be explained by its structure and electrochemical properties, which reveal that the film's amorphous structure and overall biased (002) crystal plane orientation result in large, ordered ion channels. The straightforward procedure and respectable sample qualities offered a practical method for the quick processing of high-performing EC materials and devices.



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