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Proceedings Paper

Comparison of dielectric and optical properties of nickel-oxide-based electrochromic coatings
Author(s): Torbjorn M.J. Nilsson; Gunnar A. Niklasson
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Paper 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.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1272, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IX, (1 August 1990); doi: 10.1117/12.20439
Show Author Affiliations
Torbjorn M.J. Nilsson, Chalmers Univ. of Technology (Sweden)
Gunnar A. Niklasson, Chalmers Univ. of Technology (Sweden)


Published in SPIE Proceedings Vol. 1272:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IX
Claes-Goeran Granqvist; Carl M. Lampert, Editor(s)

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