中国物理B ›› 2013, Vol. 22 ›› Issue (3): 37302-037302.doi: 10.1088/1674-1056/22/3/037302

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

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

王淑芳a, 闫国英a b, 陈珊珊a, 白子龙a, 王江龙a, 于威a, 傅广生a b   

  1. a College of Physics Science and Technology, Hebei University, Baoding 071002, China;
    b School of Information Engineering, Hebei University of Technology, Tianjin 300401, China
  • 收稿日期:2012-08-25 修回日期:2012-09-18 出版日期:2013-02-01 发布日期:2013-02-01
  • 基金资助:
    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).

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

Wang Shu-Fang (王淑芳)a, Yan Guo-Ying (闫国英)a b, Chen Shan-Shan (陈珊珊)a, Bai Zi-Long (白子龙)a, Wang Jiang-Long (王江龙)a, Yu Wei (于威)a, Fu Guang-Sheng (傅广生)a b   

  1. a College of Physics Science and Technology, Hebei University, Baoding 071002, China;
    b School of Information Engineering, Hebei University of Technology, Tianjin 300401, China
  • Received:2012-08-25 Revised:2012-09-18 Online:2013-02-01 Published:2013-02-01
  • Contact: Fu Guang-Sheng E-mail:fugs@hbu.edu.cn
  • Supported by:
    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).

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摘要： Three Bi2Sr2Co2Oy 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 Bi2Sr2Co2Oy 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 Bi2Sr2Co2Oy thin film with grains in nanometer size.

关键词: thermoelectric properties, Bi2Sr2Co2Oy thin films, microstructure, chemical solution deposition

Abstract: Three Bi2Sr2Co2Oy 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 Bi2Sr2Co2Oy 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 Bi2Sr2Co2Oy thin film with grains in nanometer size.

Key words: thermoelectric properties, Bi2Sr2Co2Oy thin films, microstructure, chemical solution deposition

中图分类号:  (Thermoelectric effects)

  • 73.50.Lw
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))