Kinetically controlled thin-film growth of layered β- and γ-NaxCoO2 cobaltate

Son, J. Y.; Kim, Bog G.; Cho, J. H.
May 2005
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p221918
Academic Journal
We report growth characteristics of epitaxial β-Na0.6CoO2 and γ-Na0.7CoO2 thin films on (001) sapphire substrates grown by pulsed-laser deposition. Reduction of the deposition rate could change the structure of the NaxCoO2 thin film from a β phase with an island growth mode to a γ phase with a layer-by-layer growth mode. The γ-Na0.7CoO2 thin film exhibits spiral surface growth with multiterraced islands and highly crystallized texture compared to that of the β-Na0.6CoO2 thin film. This heterogeneous epitaxial film growth can give an example of the strain effect of physical properties and growth dynamics of NaxCoO2 as well as the subtle nature of structural change.


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