N-type Se&Lu-codoped Bi₂Te₃ nanopowders were prepared by hydrothermal method and sintered by spark plasma sintering technology to form dense samples. By further doping Se element into Lu-doped Bi₂Te₃ samples, the thickness of the nanosheets has the tendency to become thinner. The electrical conductivity of Lu_0.1Bi_1.9Te_3−xSe_x material is reduced with the increasing Se content due to the reduced carrier concentration, while the Seeback coefficient values are enhanced. The lattice thermal conductivity of the Lu_0.1Bi_1.9Te_3−xSe_x is greatly reduced due to the introduced point defects and atomic mass fluctuation. Finally, the Lu_0.1Bi_1.9Te_2.7Se_0.3 sample obtained a maximum ZT value of 0.85 at 420 K. This study provides a low-cost and simple low-temperature method to mass production of Se&Lu-codoped Bi₂Te₃ with high thermoelectric performance for practical applications.

中文翻译：

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水热合成n型Se＆Lu掺杂Bi 2 Te 3的增强的热电性能

采用水热法制备了N型Se＆Lu掺杂的Bi ₂ Te ₃纳米粉，并通过火花等离子体烧结技术对其进行烧结，形成致密样品。通过将Se元素进一步掺杂到Lu掺杂的Bi ₂ Te ₃样品中，纳米片的厚度具有变薄的趋势。由于载流子浓度降低，Lu _0.1 Bi _1.9 Te _{3− x} Se _x材料的电导率随着Se含量的增加而降低，而Seeback系数值则提高。Lu _0.1 Bi _1.9 Te _{3− x} Se的晶格热导率由于引入的点缺陷和原子质量波动， _x大大降低。最后，Lu _0.1 Bi _1.9 Te _2.7 Se _0.3样品在420 K下获得的最大ZT值为0.85。这项研究提供了一种低成本，简单的低温方法，以高热电势大量生产Se＆Lu掺杂的Bi ₂ Te ₃。实际应用的性能。