Effect of microstructure on thermoelectric properties of CSD-grown Bi2Sr2Co2Oy thin films |
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Authors: | Wang Shu-Fang Yan Guo-Ying Chen Shan-Shan Bai Zi-Long Wang Jiang-Long Yu Wei Fu Guang-Sheng |
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Affiliation: | a College of Physics Science and Technology, Hebei University, Baoding 071002, China;b School of Information Engineering, Hebei University of Technology, Tianjin 300401, China |
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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. |
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Keywords: | thermoelectric properties Bi2Sr2Co2Oy thin films microstructure chemical solution deposition |
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