Thermoelectric properties of epitaxial and topotaxial Na xCoO 2 thin films

A. Venimadhav, Z. Ma, Qi Li, A. Soukiassian, X. X. Xi, D. G. Schlom, R. Arroyave, Z. K. Liu, Minhyea Lee, Nai Phuan Ong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

We report structural, electrical, and thermopower properties of epitaxial and topotaxial Na xCoO 2 thin films on (0001) sapphire substrate. Topotaxial Na xCoO 2 films were prepared by converting an epitaxial Co 3O 4 film to Na xCoO 2 by annealing in Na vapor and epitaxial Na xCoO 2 films were obtained by pulsed laser deposition. All the films are c-axis oriented. For topotaxial films, annealing in different Na vapor pressures resulted in films with different Na concentrations, which showed distinct transport properties. For directly deposited epitaxial films by pulsed laser deposition, deposition parameters are found to control the Na concentration and hence the film properties. The largest thermoelectric power of the samples made by different methods is found to be similar in the range of 70-100 μV/K at room temperature.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium Proceedings
Pages65-74
Number of pages10
StatePublished - May 8 2006
Event2005 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: Nov 28 2005Dec 1 2005

Publication series

NameMaterials Research Society Symposium Proceedings
Volume886
ISSN (Print)0272-9172

Other

Other2005 Materials Research Society Fall Meeting
CountryUnited States
CityBoston, MA
Period11/28/0512/1/05

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Venimadhav, A., Ma, Z., Li, Q., Soukiassian, A., Xi, X. X., Schlom, D. G., Arroyave, R., Liu, Z. K., Lee, M., & Ong, N. P. (2006). Thermoelectric properties of epitaxial and topotaxial Na xCoO 2 thin films. In Materials Research Society Symposium Proceedings (pp. 65-74). (Materials Research Society Symposium Proceedings; Vol. 886).