Investigation on structure and thermoelectric properties in p-type Bi 0.48 Sb 1.52 Te 3 via PbTe incorporating
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Investigation on structure and thermoelectric properties in p-type Bi0.48Sb1.52Te3 via PbTe incorporating Shaojun Liang1,2 · Jingtao Xu2 · Hongxiang Wang2 · Xiaojian Tan2 · Guo‑Qiang Liu2 · Hezhu Shao2 · Bo Yu2 · Song Yue1 · Jun Jiang2 Received: 9 January 2018 / Accepted: 12 February 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract Bismuth telluride alloys are the most commercially used thermoelectric materials. Herein, Bi0.48Sb1.52Te3 + x wt% PbTe (x = 0, 0.05, 0.1, and 0.15) composites have been prepared by the zone-melting method. The microstructure and thermoelectric properties of the composites are investigated. It is found that PbTe addition could effectively improve the electrical properties of Bi0.48Sb1.52Te3. As a result, a very large power factor of 55.5 µW cm−1 K−2 is achieved at 300 K for x = 0.05. Compared with the matrix, the largest figure of merit ZT for the composites shows slight enhancement, and the average figure of merit ZTave is obviously improved. This work indicated that a trace amount of PbTe can effectively improve the thermoelectric performance of Bi0.48Sb1.52Te3.
1 Introduction Thermoelectric materials have attracted extensive attention in the past decades due to their potential applications in direct thermal-to-electrical energy conversion without hazardous liquids, moving parts or greenhouse emissions [1–3]. The thermoelectric conversion efficiency is mainly determined by the dimensionless figure of merit ZT. ZT is defined as ZT = 𝜎𝛼 2 T∕ 𝜅, where α is the Seebeck coefficient, σ is the electrical conductivity, T is the absolute temperature, and κ is the total thermal conductivity containing both the carrier contribution κ(e and) phonon contribution κl. Increasing the power factor 𝜎𝛼 2 by energy band engineering and reducing κ by introducing additional phonon scattering are
* Jingtao Xu [email protected] * Song Yue [email protected] * Jun Jiang [email protected] 1
Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2
two common methods to improve the conversion efficiency of thermoelectric [4–10]. Bismuth telluride and its alloys (BiSbTe) are one of the most important thermoelectric materials near room temperature as so far. In recent years, several methods and techniques can be adopted to raise the ZT values of bismuth telluride based alloys such as microwave assisted method [11], hot pressing [12], mechanical alloying [13], spark plasma sintering [14, 15], magnetron sputtering [16] or by doping them with certain materials which can tune its properties [17]. Nanocomposite has been considered as a promising way to improve ZT by synergistically tuning the electrical and the thermal properties at the same time. ZnAlO, graphene, WSe2 and silver have been reported to form effective nanoinclusions in Bi2Te3-based allo
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