Fabrication of NaxCoO2 thin films by pulsed laser deposition

In this paper, we report the growth of NaxCoO2 thin films by pulsed laser deposition. Single β-NaxCoO2 phase films showing metallic conducting behavior were obtained. The surface morphology of these films showed granular features. The films were stable in vacuum or in the pure oxygen environment, bu...

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Veröffentlicht in:	Thin solid films 2006-02, Vol.497 (1-2), p.338-340
Hauptverfasser:	Zhou, H., Zhang, X.P., Xie, B.T., Xiao, Y.S., Yang, C.X., He, Y.J., Zhao, Y.G.
Format:	Artikel
Sprache:	eng
Schlagworte:	Cobalt oxide Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Defects and impurities in crystals microstructure Exact sciences and technology Grain and twin boundaries Laser deposition Materials science Methods of deposition of films and coatings film growth and epitaxy Physics Resistivity Structure of solids and liquids crystallography X-ray diffraction
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Beschreibung
Zusammenfassung:	In this paper, we report the growth of NaxCoO2 thin films by pulsed laser deposition. Single β-NaxCoO2 phase films showing metallic conducting behavior were obtained. The surface morphology of these films showed granular features. The films were stable in vacuum or in the pure oxygen environment, but were not stable in air, causing their resistivity to increase exponentially with time and become semiconductors or insulators. X-ray diffraction measurements confirmed that the (00l) orientation of the films did not change during this degradation of the films. The results suggest that the resistivity increase of the films is related to the appearance of some impurity phase at the grain boundaries of NaxCoO2 due to reaction with moisture.
ISSN:	0040-6090 1879-2731
DOI:	10.1016/j.tsf.2005.10.078