The electrochromic characteristics of sol gel-prepared NiO thin film

In this work, NiO thin film was prepared by the sol–gel technique and analysed by thermogravimetry, x-ray diffractometry and x-ray photoelectron spectroscopy. The electrochromic characteristics were studied by ultraviolet spectroscopy. NiO thin film shows electrochromic characteristics. Its colour changes from transparent to brown when a voltage is applied. The transmittance of the film can shift from 90 to 40%. Deterioration of the film caused by colouring and discolouring was not observed for up to 100 cycles.