Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Revolutionary Materials for Solid State Energy Conversion (RMSSEC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Postdoctoral Science Foundation of China
- OSTI Identifier:
- 1370346
- Grant/Contract Number:
- SC0001054; 51571007; 51202008
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Energy & Environmental Science
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 11; Related Information: RMSSEC partners with Michigan State University (lead); University of California, Los Angeles; University of Michigan; Northwestern University; Oak Ridge National Laboratory; Ohio State University; Wayne State University; Journal ID: ISSN 1754-5692
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
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., and Zhao, Li-Dong. Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe. United States: N. p., 2015.
Web. doi:10.1039/c5ee02423d.
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. Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe. United States. https://doi.org/10.1039/c5ee02423d
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., and Zhao, Li-Dong. Mon .
"Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe". United States. https://doi.org/10.1039/c5ee02423d. https://www.osti.gov/servlets/purl/1370346.
@article{osti_1370346,
title = {Synergistically optimized electrical and thermal transport properties of SnTe via alloying high-solubility MnTe},
author = {Wu, Haijun and Chang, Cheng and Feng, Dan and Xiao, Yu and Zhang, Xiao and Pei, Yanling and Zheng, Lei and Wu, Di and Gong, Shengkai and Chen, Yue and He, Jiaqing and Kanatzidis, Mercouri G. and Zhao, Li-Dong},
abstractNote = {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.},
doi = {10.1039/c5ee02423d},
journal = {Energy & Environmental Science},
number = 11,
volume = 8,
place = {United States},
year = {Mon Sep 07 00:00:00 EDT 2015},
month = {Mon Sep 07 00:00:00 EDT 2015}
}
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