Surface Morphology, Structure and Transport Property of Na_xCoO₂ Thin Films Grown by Pulsed Laser Deposition

Abstract:

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.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 3807-3810
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.3807
• Online since: January 2005
• Authors: X.P. Zhang, Y.S. Xiao, H. Zhou, B.T. Xie, C.X. Yang, Y.G. Zhao
• Keywords: Na_xCoO₂, PLD, Resistivity, Thin Film

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