Effect of microstructure on thermoelectric properties of CSD-grown Bi2Sr2Co2Oy thin films

doi:10.1088/1674-1056/22/3/037302

Abstract Three Bi₂Sr₂Co₂O_y thin films with different microstructures have been prepared by chemical solution deposition on LaAlO₃(001) through varying the annealing temperature. With the decrease in the annealing temperature, both the size and c-axis alignment degree of grains in the film decrease as well, leading to an increase in the film resistivity. In addition, the decrease in the annealing temperature also results in a slight increase in the seebeck coefficient due to the enhanced energy filtering effect of small-grain film. The nanostructured Bi₂Sr₂Co₂O_y film with the average grain size of about 100 nm shows a power factor comparable to that of the films with larger grains. Since the thermal conductivity of the nanostrcutured films can be depressed due to the enhanced phonon scattering by grain boundary, a higher figure of merit is expected in Bi₂Sr₂Co₂O_y thin film with grains in nanometer size.

Keywords: thermoelectric properties Bi₂Sr₂Co₂O_y thin films microstructure chemical solution deposition

Received: 25 August 2012
Revised: 18 September 2012
Accepted manuscript online:

PACS:	73.50.Lw	(Thermoelectric effects)
	81.40.-z	(Treatment of materials and its effects on microstructure, nanostructure, And properties)
	72.80.Ga	(Transition-metal compounds)
	81.15.Lm	(Liquid phase epitaxy; deposition from liquid phases (melts, solutions, And surface layers on liquids))

Fund: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 10904030) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20091301120002).

Corresponding Authors: Fu Guang-Sheng
E-mail: fugs@hbu.edu.cn

Cite this article:

Wang Shu-Fang (王淑芳), Yan Guo-Ying (闫国英), Chen Shan-Shan (陈珊珊), Bai Zi-Long (白子龙), Wang Jiang-Long (王江龙), Yu Wei (于威), Fu Guang-Sheng (傅广生) Effect of microstructure on thermoelectric properties of CSD-grown Bi₂Sr₂Co₂O_y thin films 2013 Chin. Phys. B 22 037302

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Effect of microstructure on thermoelectric properties of CSD-grown Bi2Sr2Co2Oy thin films

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Effect of microstructure on thermoelectric properties of CSD-grown Bi₂Sr₂Co₂O_y thin films