Donor-like effect and thermoelectric properties in n-type Bi<sub>2</sub>Te<sub>3</sub>-based compounds
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Published:2023
Issue:9
Volume:72
Page:097101
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ISSN:1000-3290
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Container-title:Acta Physica Sinica
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language:
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Short-container-title:Acta Phys. Sin.
Author:
Li Qiang,Chen Shuo,Liu Ke-Ke,Lu Zhi-Qiang,Hu Qin,Feng Li-Ping,Zhang Qing-Jie,Wu Jin-Song,Su Xian-Li,Tang Xin-Feng, , ,
Abstract
Grain size refinement is the vital stratagem for improving mechanical properties of Bi<sub>2</sub>Te<sub>3</sub>-based thermoelectric material. However, the donor-like effect induced by grain size refinement seriously deteriorates the thermoelectric properties especially near room temperature. Once the donor-like effect is generated, it is very difficult to eliminate the donor-like effect by the simple heat treatment process and other processes. In this study, the influences of particle size on the donor-like effect and thermoelectric properties are systematically studied for Bi<sub>2</sub>Te<sub>3</sub>-based compounds. As the particle size decreases, the donor-like effect is enhanced significantly. The oxygen-induced donor-like effect dramatically increases the carrier concentration from 3.36× 10<sup>19</sup> cm<sup>–3</sup> for 10 M sintered sample to 7.33×10<sup>19</sup> cm<sup>–3</sup> for 120 M sintered sample, which is largely beyond the optimal carrier concentration of 2.51×10<sup>19</sup> cm<sup>–3</sup> and seriously deteriorates the thermoelectric properties. However, when the particle size of the powder is 1–2 mm, the Seebeck coefficient of –195 μV/K and the carrier concentration of 3.36×10<sup>19</sup> cm<sup>–3</sup> near room temperature are achieved, which are similar to those of the ZM sample with the Seebeck coefficient of –203 μV/K and the carrier concentration of 2.51×10<sup>19</sup> cm<sup>–3</sup>. The powders without the obvious donor-like effect can be used as the excellent raw material for powder metallurgy process. A maximum <i>ZT</i> value of 0.75 is achieved for the 18 M sintered sample. The excellent thermoelectric properties are expected to be obtained by enhancing the texture further. This study provides a new way to regulate and effectively suppress the generation of the donor-like effect, and provides an important guidance for the preparation of materials with excellent thermoelectric and mechanical properties by powder metallurgy process.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
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