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Electrochemical properties of WO3 sol-gel thin films on indium tin oxide/poly(ethylene terephthalate) substrate

2019; Elsevier BV; Volume: 683; Linguagem: Inglês

10.1016/j.tsf.2019.05.018

1879-2731

D.W. Leitzke, Camila M. Cholant, D.M. Landarin, C.S. Lucio, Luana U. Krüger, André Gündel, Wladimir Hernández Flores, Marco P. Rodrigues, Raphael D.C. Balboni, Agnieszka Pawlicka, César O. Avellaneda,

Conducting polymers and applications

This work presents a study on the thin films of WO3 deposited on a flexible substrate as a possible application in a flexible electrochromic device. The films were prepared by the sol-gel method and deposited by a dip-coating technique on indium tin oxide/poly(ethylene terephthalate) (ITO/PET) and densified at 100 °C for 1 h. The films of WO3 were subjected to electrochemical, optical, structural, and morphological characterizations that pointed out the film, deposited with a withdrawal of 60 mm min−1, which showed the charge density in the insertion process of 32.86 mC cm−2. This film also presented the electrochemical stability during 200 cycles. The transmittance variation (ΔT555 nm) between colored and bleached states was 42.6% and the coloration efficiency (η) was 14.91 cm2 C−1. The X-ray diffraction (XRD) confirmed the amorphous structure of the films and the atomic force microscopy (AFM) the root mean-squared (RMS) roughness of 4.15 nm. All the results indicate that this film may be used as an active layer in a flexible electrochromic device.