Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe

Wu, Haijun; Chang, Cheng; Feng, Dan; Xiao, Yu; Zhang, Xiao; Pei, Yanling; Zheng, Lei; Wu, Di; Gong, Shengkai; Chen, Yue; He, Jiaqing; Kanatzidis, Mercouri G.; Zhao, Li-Dong

doi:10.1039/c5ee02423d

Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe

Journal Article · Mon Sep 07 00:00:00 EDT 2015 · Energy & Environmental Science

DOI:https://doi.org/10.1039/c5ee02423d· OSTI ID:1370346

Wu, Haijun ^[1]; Chang, Cheng ^[2]; Feng, Dan ^[3]; Xiao, Yu ^[2]; Zhang, Xiao ^[2]; Pei, Yanling ^[2]; Zheng, Lei ^[2]; Wu, Di ^[3]; Gong, Shengkai ^[2]; Chen, Yue ^[4]; He, Jiaqing ^[3]; Kanatzidis, Mercouri G. ^[5]; Zhao, Li-Dong ^[2]

Beihang Univ., Beijing (China); South Univ. of Science and Technology of China, Shenzhen (China); National Univ. of Singapore (Singapore)
Beihang Univ., Beijing (China)
South Univ. of Science and Technology of China, Shenzhen (China)
The Univ. of Hong Kong, Hong Kong SAR (China)
Northwestern Univ., Evanston, IL (United States)

Lead chalcogenides are the most efficient thermoelectric materials. In comparison, SnTe, a lead-free analogue of PbTe, exhibits inferior thermoelectric performance due to low Seebeck coefficient and high thermal conductivity. In this report, we show that we can synergistically optimize the electrical and thermal transport properties of SnTe via alloying Mn. Further, we report that the introduction of Mn (0–50%) induces multiple effects on the band structure and microstructure of SnTe: for the former, it can tune the Fermi level and promote the convergence of the two valence bands, concurrently enhancing the Seebeck coefficient; for the latter, it can profoundly modify the microstructure into an all-scale hierarchical architecture (including nanoscale precipitates/MnTe laminates, stacking faults, layered structure, atomic-scale point defects, etc.) to scatter phonons with a broad range of mean free paths, strongly reducing the lattice thermal conductivity. Meanwhile, most significantly, the Mn alloying enlarges the energy gap of the conduction band (C band) and the light valence band (L band), thereby suppressing the bipolar thermal conductivity by increasing the band gap. The integration of these effects yields a high ZT of 1.3 at 900 K for 17% Mn alloyed SnTe.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Revolutionary Materials for Solid State Energy Conversion (RMSSEC)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); Postdoctoral Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001054

OSTI ID:: 1370346

Journal Information:: Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 11 Vol. 8; ISSN 1754-5692

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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