Electrochromic Nickel Oxide Thin Films for Solar Light Modulation

Julijana Velevska, Margareta Pecovska Gjorgjevich, Nace Stojanov

Abstract


Nickel oxide (NiOx) thin films were prepared by three different deposition techniques: electrochemical (EC) deposition, low vacuum evaporation (LVE), and chemical bath deposition (CBD). Those films were deposited onto fluorine doped tin oxide (FTO) coated glass substrates. Electrochromic behavior of the films was examined in an electrochromic device (ECD) constructed by using NiOx films as working electrodes, together with the FTO coated glass as a counter electrode in alkaline environment (0.1 M NaOH aqueous solution). The films exhibited anodic electrochromism, changing color from transparent to dark brown. Visible transmittance spectra of the nickel oxide thin films in bleached and colored states were recorded in-situ. Absorption coefficients spectra were calculated using the transmittance spectra. The output integral of the spectral intensity and the integral of the spectral modulation were calculated by taking the solar irradiance spectrum AM 1.5 for a normal illumination on a nickel oxide based ECD, and the absorption coefficients spectra of the nickel oxide films in their bleached and colored states.


Keywords


Electrochromism; Nickel oxide; Thin films; Solar light modulation.

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References


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