Electrochromic behavior of NiO thin films deposited by e-beam evaporation at room temperature

By Pereira, Sónia; Gonçalves, Alexandra; Correia, Nuno; Pinto, Joana; Pereira, Luís; Martins, Rodrigo & Fortunato, Elvira
Published in Solar Energy Materials and Solar Cells NULL 2013

Abstract

In this work we report the role of thickness on electrochromic behavior of nickel oxide (NiO) films deposited by e-beam evaporation at room temperature on ITO-coated glass. The structure and morphology of films with thicknesses between 100 and 500 nm were analyzed and then correlated with electrochemical response and transmittance modulation when immersed in 0.5 M LiClO4–PC electrolyte. The NiO exhibits an anodic coloration, reaching for the thickest film a transmittance modulation of 66% between colored and bleached state, at 630 nm, with a color efficiency of 55 cm2 C−1. Very fast switch between states was obtained, where coloration and bleaching times are 3.6 s cm−2 and 1.4 s cm−2, respectively.

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