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Crystals 2017, 7(9), 257; doi:10.3390/cryst7090257

Enhanced Thermoelectric Performance of Te-Doped Bi2Se3−xTex Bulks by Self-Propagating High-Temperature Synthesis

State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
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Academic Editor: George S. Nolas
Received: 12 June 2017 / Revised: 19 August 2017 / Accepted: 21 August 2017 / Published: 28 August 2017
(This article belongs to the Special Issue Materials Processing and Crystal Growth for Thermoelectrics)
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Abstract

Polycrystalline Bi2Se3−xTex (x = 0~1.5) samples were prepared by self-propagating high-temperature synthesis (SHS) combined with spark plasma sintering (SPS) and their thermoelectric properties were investigated. The SHS-SPS process can shorten the time with few energy consumptions, and obtain almost pure Bi2Se3-based phases. Consequently, the Se vacancies and anti-site defects contribute to the converged carrier concentration of ~2 × 1019 cm−3 while the increased carrier effective mass enhances the Seebeck coefficient to more than −158 μV K−1 over the entire temperature range. The lattice thermal conductivity is suppressed from 1.07 Wm−1 K−1 for the pristine specimen to ~0.6 Wm−1 K−1 for Te-substitution samples at 300 K because of point defects caused by the difference of mass and size between Te and Se atoms. Coupled with the enhanced power factor and reduced lattice thermal conductivity, a high ZT of 0.67 can be obtained at 473 K for the Bi2Se1.5Te1.5 sample. Our results reveal that Te-substitution based on the SHS-SPS method is highly-efficient and can improve the thermoelectric properties of Bi2Se3-based materials largely. View Full-Text
Keywords: Bi2Se3−xTex; thermoelectric; SHS; solid solution Bi2Se3−xTex; thermoelectric; SHS; solid solution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, R.; Tan, X.; Ren, G.; Liu, Y.; Zhou, Z.; Liu, C.; Lin, Y.; Nan, C. Enhanced Thermoelectric Performance of Te-Doped Bi2Se3−xTex Bulks by Self-Propagating High-Temperature Synthesis. Crystals 2017, 7, 257.

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