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 Lu0.1Bi1.9Te3-xSex 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 Lu0.1Bi1.9Te3-xSex is greatly reduced due to the introduced point defects and atomic mass fluctuation. Finally, the Lu0.1Bi1.9Te2.7Se0.3 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.
This work was funded by the Fundamental Research Funds for the Central Universities (No. 2232020A-02), National Natural Science Foundation of China (Nos. 51774096, 51871053, 51902333), Shanghai Committee of Science and Technology (18JC1411200), Program for Innovative Research Team in University of Ministry of Education of China (IRT_16R13). Q. Zhang acknowledges financial support sponsored by Shanghai Saiiling Program (19YF1454000) and Key Research Program of Frontier Sciences, CAS (Grant No. ZDBS-LY-JSC037).
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