Electrochromic Film by DC Sputtering J. Phys. XRD and SEM examination show that the film is uniform and full of small granules of almost the same size.
Slight difference exists between the as-deposited film and the colored film.
Some weak crystal peaks appear in the latter film. The film has good electrochromic property. The content of oxygen in the vacuum chamber has no obvious effect on the electrochromic property of the film. XPS was used to investigate the nickel atomic state in the film. The result shows that is oxided into with coloring.