Abstract
In recent years, the element semiconductor Te has been considered as a potential thermoelectric material in the middle temperature region due to its excellent thermoelectric performance and high stability. However, it is necessary to dop with high toxic As element or low toxic Bi or Sb under high pressure conditions to obtain a moderate carrier concentration. In this study, we synthesized Sb-Se doped and FeTe2 composited Te under lower pressure conditions. The results show that the solid solubility of Fe in Te does not exceed 5 at%. After exceeding its solid solubility, Fe is precipitated in the form of FeTe2. The electrical transport properties and thermal conductivity of Te were tuned effectively by FeTe2 composite and Sb doping. The maximum ZT value of the sample with the composition of Fe0.1Te0.9Sb0.003 reaches 0.65 at 607 K, which is much higher than that of the pristine Te. The thermal conductivity was further reduced by Se doping. Thereby, the ZT value of the sample Fe0.1Te0.872Sb0.003Se0.025 was enhanced to 0.76 at 580 K. These results show that combining with doping and composite can improve the thermoelectric properties of Te effectively.
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The data that support the findings of this study are available upon reasonable request from the authors. Research Data are a valuable asset to The Henan Polytechnic University (the University). Definition, responsibility, control, and distribution of Research Data produced during activities supported by the University; supported by external sponsors; or produced with University facilities, resources, or other personnel. This study does not contain any studies with human participants or animals performed by any other authors.
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Funding
This work is supported by the Guangxi Natural Science Foundation (Grant Nos: AD20297014, 2021GXNSFAA220064), the Natural Science Foundation of China ( Grant No: 52062031).
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Weikang Lu and Xubiao Zhou: investigation, data curation, writing- original draft preparation. Shangsheng Li: supervision, resources, methodology. Hongyu Zhu: data curation, funding acquisition. Meihua Hu: data curation. Bingke Qin: data curation, funding acquisition. Taichao Su: data curation, writing- reviewing and editing, methodology, funding acquisition.
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Lu, W., Li, S., Zhou, X. et al. Thermoelectric performance of Te composited with FeTe2 and co-doped with Sb and Se. J Mater Sci: Mater Electron 35, 54 (2024). https://doi.org/10.1007/s10854-023-11796-7
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DOI: https://doi.org/10.1007/s10854-023-11796-7