Abstract
The influence of excess antimony (Sb) on the Seebeck coefficient of antimony telluride (Sb2Te3) was investigated. Sb-rich Sb2Te3 thin film experimentally acquires Seebeck coefficient of 536 µV K−1 at room temperature, almost six times of stoichiometric Sb2Te3 thin film 90 µV K−1. The prominent enhancement of Seebeck coefficient could be attributed to carrier energy filtering effect at Sb/Sb2Te3 nanocrystal boundaries, evidenced by a set of characterizations. Meanwhile, Sb-rich Sb2Te3 thin film behaves low thermal conductivity. This experiment result implies that by altering Sb content, various Seebeck coefficients would be acquired in Sb-rich Sb2Te3 films. The highly thermoelectricity performance is especially appropriate for thermo-electric device such as thermoelectric sensor.
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Acknowledgments
This research was supported by Shanghai Science and Technology Funds (10520710400, 10PJ1403800, 11DZ1111200), Yunnan Provincial Science and Technology Department (2010AD003), National Natural Science Foundation of China (21103104), Innovation Foundation of Shanghai University and the Special Fund for Selection and Cultivation Excellent Youth in the University of Shanghai city. The authors gratefully acknowledge teachers from Instrumental Analysis Research Centre of Shanghai University for his help in XRD, TEM and XPS experiment.
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Zhang, Z., Wu, Y., Zhang, H. et al. Enhancement of Seebeck coefficient in Sb-rich Sb2Te3 thin film. J Mater Sci: Mater Electron 26, 1619–1624 (2015). https://doi.org/10.1007/s10854-014-2585-8
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DOI: https://doi.org/10.1007/s10854-014-2585-8