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Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 54: Nanoengineered Thin Films

DS 54.5: Talk

Thursday, March 17, 2011, 19:00–19:15, GER 38

(contribution withdrawn) Sodium engineering in multifunctional NaxCoO2 thin films grown by pulsed laser deposition — •Sandra Hildebrandt1, Ingo Fritsch2, Dirk Becker1, Philipp Komissinskiy1, Hanns-Ulrich Habermeier2, Wolfram Jaegermann1, and Lambert Alff11Institut für Materialwissenschaft, TU Darmstadt, Petersenstr. 23, 64287 Darmstadt, Germany — 2Max Planck Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany

We report on the growth of NaxCoO2 thin films by pulsed laser deposition. The sodium content in as grown films is always about x=0.6. By annealing, x can be varied between 0.58 and 0.77. Further Na deintercalation down to x=0.35 is achieved by chemical treatment of the film with a bromine solution. In the presence of water, a phase mixture of Na0.35CoO2 and Na0.35CoO2·0.9H2O is obtained. This can be transformed into the superconducting compound Na0.35CoO2·1.3H2O by subsequent water intercalation [1]. The NaxCoO2 films with higher sodium content (0.6<x<1) have typical resistivities of about 7 mΩcm at room temperature. This material already known for its large thermoelectric power, now comes in the focus as substitutional material for LixCoO2 in solid state batteries. A high sodium ion conductance still has to be confirmed. We would like to acknowledge the financial support from DFG-Project AL560/6-1.

[1] Y. Krockenberger, I. Fritsch, G. Christiani, H.-U. Habermeier, Li Yu, C. Bernhard, B. Keimer, and L. Alff. Appl. Phys. Lett. 88, 162501 (2006).

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