Bifunctional MoO3-WO3/Ag/MoO3-WO3 Films for Efficient ITO-Free Electrochromic Devices

Wenjie Dong; Ying Lv; Lili Xiao; Yi Fan; Nan Zhang; Xingyuan Liu

doi:10.1021/acsami.6b12346

Bifunctional MoO₃-WO₃/Ag/MoO₃-WO₃ Films for Efficient ITO-Free Electrochromic Devices

ACS Appl Mater Interfaces. 2016 Dec 14;8(49):33842-33847. doi: 10.1021/acsami.6b12346. Epub 2016 Dec 5.

Authors

Wenjie Dong^{1

2}, Ying Lv¹, Lili Xiao^{1

2}, Yi Fan¹, Nan Zhang¹, Xingyuan Liu¹

Affiliations

¹ State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , Changchun 130033, China.
² University of Chinese Academy of Sciences , Beijing 100049, China.

PMID: 27960371
DOI: 10.1021/acsami.6b12346

Abstract

Dielectric-metal-dielectric (DMD) trilayer films, served as both electrochromic (EC) film and transparent conductor (TC), have exhibited great potential application in low-cost, ITO-free electrochromic devices (ECDs). However, recent reports on the DMD-based ECDs revealed that the response time and the optical modulation properties were not very satisfactory. Here, the mixed MoO₃-WO₃ materials were first introduced as the dielectric layer to construct an EC-TC bifunctional MoO₃-WO₃/Ag/MoO₃-WO₃ (MWAMW) film, which demonstrates strong and broad-band optical modulation in the visible light region, fast color-switching time (2.7 s for coloration and 4.1 s for bleaching), along with high coloration efficiency (70 cm² C^-1). The electrical structure and electrochemical reaction kinetics analysis revealed that the improved EC performances are associated with the increased electron intervalence transition together with the fast charge-transfer and ion-diffusion dynamics.

Keywords: dielectric-metal-dielectric; doping; electrochromic; mixed oxide; transparent conductor.