Abstract
Electrochromic properties, known as a reversible modulation of the optical properties under an applied voltage, of NiO thin films are discussed in respect of the film stoichiometry. Using radio-frequency magnetron sputtering, non-stoichiometric “NiO” thin films of good crystallinity were grown at room temperature from low oxygen partial pressure [i.e., above 2 % P(O2/Ar + O2)]. A further increase in oxygen partial pressure leads to conductive brownish films containing a large amount of Ni3+. 2 %-Ni1−x O thin films exhibit significant EC performance in lithium-based electrolyte with a transmittance modulation of 25 %. If it is generally accepted that this optical modulation is due to an insertion of small cations, the presence of additional surface phenomena is also shown. The cycling of full device, based on the association of WO3 and “NiO” in temperature up to 60 °C and down to −35 °C confirms expected increase and decrease in capacity while surprisingly the optical switch from a transparent to a neutral gray color appears slightly modified.
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Acknowledgments
The authors wish to thank the University of Bordeaux for funding this research and in particular the Ph. D. grant of M. Da Rocha. The authors thank D. Michau, L. Teule-Gay, S. Buffière and A. Fargues from ICMCB for their great help in experimental achievements and helpful discussions as well as A. Barnabé from CIRIMAT for electrical properties measurements.
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Da Rocha, M., Rougier, A. Electrochromism of non-stoichiometric NiO thin film: as single layer and in full device. Appl. Phys. A 122, 370 (2016). https://doi.org/10.1007/s00339-016-9923-z
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DOI: https://doi.org/10.1007/s00339-016-9923-z