Surface Morphology, Structure and Transport Property of NaxCoO2 Thin Films Grown by Pulsed Laser Deposition
In this paper, we report the growth of NaxCoO2 thin films by pulsed-laser deposition (PLD). It is shown that the concentration of sodium is very sensitive to the substrate temperature and the target-substrate distance due to the evaporation of sodium during the deposition. α'-phase Na0.75CoO2 and γ-phase Na0.71CoO2 thin films can be obtained with different conditions. Correspondingly, the surface morphology of the films changes from flake-like to particle-like. The temperature dependence of resistivity for the films prepared with the optimal condition shows metallic behavior, consistent with the data of NaxCoO2 single crystals. This work demonstrates that PLD is a promising technique to get high quality NaxCoO2 thin films.
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
X.P. Zhang et al., "Surface Morphology, Structure and Transport Property of NaxCoO2 Thin Films Grown by Pulsed Laser Deposition", Materials Science Forum, Vols. 475-479, pp. 3807-3810, 2005