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Thermoelectric properties of epitaxial and topotaxial NaxCoO2 thin films

Published online by Cambridge University Press:  01 February 2011

Adyam Venimadhav ,
Z Ma ,
Qi Li ,
A Soukiassian ,
X. X. Xi ,
D. G. Schlom ,
R. Arroyave ,
Z. K. Liu ,
Minhyea Lee  and
N. P. Ong
Adyam Venimadhav
Affiliation:
avm@phys.psu.edu, Pennsylvania State University, Physics, 104 Davey Lab, University Park, State College, Pennsylvania, 16802, United States, 814-863-0528, 814-865-3604
Z Ma
Affiliation:
qil1@psu.edu, PSU, Physics, United States
Qi Li
Affiliation:
qil1@psu.edu, PSU, Physics, United States
A Soukiassian
Affiliation:
aqs11@psu.edu, PSU, Materials Science and Engineering, United States
X. X. Xi
Affiliation:
xxx4@psu.edu, PSU, Materials Science and Engineering, United States
D. G. Schlom
Affiliation:
schlom@ems.psu.edu, PSU, Materials Science and Engineering, United States
R. Arroyave
Affiliation:
rua3@psu.edu, PSU, Materials Science and Engineering, United States
Z. K. Liu
Affiliation:
zikui@psu.edu, PSU, Materials Science and Engineering, United States
Minhyea Lee
Affiliation:
lee@princeton.edu, Princeton University, Physics, United States
N. P. Ong
Affiliation:
npo@princeton.edu, Princeton University, Physics, United States
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Abstract

We report structural, electrical, and thermopower properties of epitaxial and topotaxial NaxCoO2 thin films on (0001) sapphire substrate. Topotaxial NaxCoO2 films were prepared by converting an epitaxial Co3O4 film to NaxCoO2 by annealing in Na vapor and epitaxial NaxCoO2 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

Keywords

thermoelectricityoxidelaser ablation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 886: Symposium F – Materials and Technologies fore Direct Thermal-to-Electric Energy Conversion , 2005 , 0886-F02-02
Copyright
Copyright © Materials Research Society 2006

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References

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