Comparison of dielectric and optical properties of nickel-oxide-based electrochromic coatings

Torbjorn M.J. Nilsson; Gunnar A. Niklasson

doi:10.1117/12.20439

1 August 1990 Comparison of dielectric and optical properties of nickel-oxide-based electrochromic coatings

Torbjorn M.J. Nilsson, Gunnar A. Niklasson

Proceedings Volume 1272, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IX; (1990) https://doi.org/10.1117/12.20439
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

We have studied the optical properties, as well as the dielectric permittivity in the frequency range 1O-1O' Hz, for electrochromic hydrated nickel oxide films. The films were produced by dc sputtering and were subsequently elecirochemically treated in order to achieve different visible absorption. Dielectric and optical measurements were carried out on clear and dark films as well as films of intermediate absorption. The dielectric spectra showed a dc conductivity at low frequencies crossing over to a percolation behaviour at higher frequencies. For films in the clear state we also observed a broad relaxation peak, superimposed on a background similar to the percolation behaviour. The optical spectra were dominated by a broad absorption in the visible region, peaked at about 2.3 eV with a shoulder around 1 .5eV. We believe that these peaks are due to charge transfer excitations. No evidence of polaron effects was found.

Citation Download Citation

Torbjorn M.J. Nilsson and Gunnar A. Niklasson "Comparison of dielectric and optical properties of nickel-oxide-based electrochromic coatings", Proc. SPIE 1272, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IX, (1 August 1990); https://doi.org/10.1117/12.20439

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