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Science China Materials

, Volume 62, Issue 3, pp 389–398 | Cite as

Solution-processed n-type Bi2Te3−xSex nanocomposites with enhanced thermoelectric performance via liquid-phase sintering

  • Chaohua Zhang (张朝华)Email author
  • Chunxiao Zhang (张春笑)
  • Hongkuan Ng (黄洪宽)
  • Qihua Xiong (熊启华)Email author
Articles
  • 56 Downloads

Abstract

The much slower progress in enhancing the thermoelectric performance of n-type Bi2Te3 than that of p-type Bi2Te3 based materials in the past decade hinders the widespread use in power generation and refrigeration. Here, a facile bottom-up solution-synthesis with spark plasma sintering (SPS) process has been developed to build n-type Bi2Te3−xSex bulk nanocomposites, which substantially improves the power factor and decreases the lattice thermal conductivity by tuning the interface scattering of phonons and electrons. The stoichiometric composition in ternary Bi2Te3−xSex nanocomposites is also tuned to optimize the carrier concentration and lattice thermal conductivity. The optimized bulk nanocomposite Bi2Te2.7Se0.3 exhibits a ZT of 1.1 at ~371 K, which is comparable to the corresponding commercially available ingots. Our results demonstrate the great potential of the solution-processed n-type Bi2Te3−xSex nanocomposites for cost-effective thermoelectric applications.

Keywords

thermoelectric liquid-phase sintering nanocomposites solution-processed bismuth telluride 

液相烧结增强溶液法制备的n型碲化铋基纳米复合材料的热电性能

摘要

近十多年来Bi2Te3基材料热电性能研究中, n型材料的热电性能提升要比p型慢很多, 这极大限制了Bi2Te3基材料在发电和制冷应用 领域中的广泛推广. 本文介绍了一种简单的“自下而上”的溶液合成方法, 并结合放电等离子体烧结工艺来构建n型Bi2Te3−xSex纳米复合块 体材料. 在化学溶液合成过程中引入过量的碲源, 实现在烧结制备样品的过程中引入液相烧结过程. 这一过程优化了声子和电子在界面的 散射行为, 从而增强了材料的功率因子并降低了晶格热导率. 通过调整Bi2Te3−xSex 纳米复合材料中的化学成分进一步实现了载流子浓度和 晶格热导率的优化. 优化的Bi2Te2.7Se0.3材料在~371K下的ZT值达到了1.1, 与商业化碲化铋材料的ZT值相当. 本研究表明溶液法制备的n型 碲化铋基纳米复合材料在大规模低成本的热电应用领域具有重要前景.

Notes

Acknowledgements

This work was supported by the Natural Science Foundation of SZU (2017003), Shenzhen Science and Technology Research Grant (JCYJ20150324141711684), Singapore National Research Foundation (NRF-RF2009-06) and an Investigator-ship Award (NRFNRFI2015- 03), Ministry of Education (Singapore) via an AcRF Tier2 Grant (MOE2012-T2-2-086). We also thank Dr. Zhong Li and Prof. Khiam Aik Khor for the support on the spark-plasma-sintering experiments.

Supplementary material

40843_2018_9312_MOESM1_ESM.pdf (788 kb)
Supplementary material, approximately 789 KB.

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Chaohua Zhang (张朝华)
    • 1
    Email author
  • Chunxiao Zhang (张春笑)
    • 1
  • Hongkuan Ng (黄洪宽)
    • 2
  • Qihua Xiong (熊启华)
    • 2
    Email author
  1. 1.College of Materials Science and Engineering, Shenzhen Key Laboratory of Special Functional MaterialsShenzhen UniversityShenzhenChina
  2. 2.Division of Physics and Applied Physics, School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore

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