Abstract
Thallium-doped Tl x Bi2−x Te3 (x = 0.0, 0.05, 0.1, and 0.2) nanopowders were synthesized by the hydrothermal method. The doping effect of thallium on the morphologies of the synthesized nanopowders was investigated. It was found that the doping of thallium can significantly change the morphologies of the synthesized nanopowders. The synthesized nanopowders were hot-pressed into bulk pellets and the doping effects of thallium on the transport properties of these pellets were investigated. The results show that the doping of thallium can enhance the Seebeck coefficient but increase the electrical resistivity. Moreover, the power factors of the thallium-doped samples decrease with the increasing of the thallium doping level as compared with the un-doped sample. This is attributed to the increase of the electrical resistivity and the disappearing of the flower-like morphologies of the doped nanopowders.
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Acknowledgements
This work was supported partly by the Science and Technology Development Program of Henan Province of China (Grant No. 142102210043), Foundation of Henan Educational Committee (Grant Nos. 14A140017 and 16A140036), and the Dostdoctoral Program of Hanan Province of China (Grant No. 2014008).
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Yao, L., Wu, F., Wang, X.X. et al. Effects of Thallium Doping on the Transport Properties of Bi2Te3 Alloy. J. Electron. Mater. 45, 3053–3058 (2016). https://doi.org/10.1007/s11664-016-4396-6
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DOI: https://doi.org/10.1007/s11664-016-4396-6