High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity

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High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity
Title:
High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity
Journal Title:
Nature Communications
Publication Date:
09 August 2021
Citation:
Hu, L., Fang, Y.-W., Qin, F., Cao, X., Zhao, X., Luo, Y., Repaka, D. V. M., Luo, W., Suwardi, A., Soldi, T., Aydemir, U., Huang, Y., Liu, Z., Hippalgaonkar, K., Snyder, G. J., Xu, J., & Yan, Q. (2021). High thermoelectric performance enabled by convergence of nested conduction bands in Pb7Bi4Se13 with low thermal conductivity. Nature Communications, 12(1). https://doi.org/10.1038/s41467-021-25119-z
Abstract:
AbstractThermoelectrics enable waste heat recovery, holding promises in relieving energy and environmental crisis. Lillianite materials have been long-term ignored due to low thermoelectric efficiency. Herein we report the discovery of superior thermoelectric performance in Pb7Bi4Se13 based lillianites, with a peak figure of merit, zT of 1.35 at 800 K and a high average zT of 0.92 (450–800 K). A unique quality factor is established to predict and evaluate thermoelectric performances. It considers both band nonparabolicity and band gaps, commonly negligible in conventional quality factors. Such appealing performance is attributed to the convergence of effectively nested conduction bands, providing a high number of valley degeneracy, and a low thermal conductivity, stemming from large lattice anharmonicity, low-frequency localized Einstein modes and the coexistence of high-density moiré fringes and nanoscale defects. This work rekindles the vision that Pb7Bi4Se13 based lillianites are promising candidates for highly efficient thermoelectric energy conversion.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the Singapore Ministry of Education - MOE Tier 2
Grant Reference no. : MOE2018-T2-1-010

This research / project is supported by the Agency for Science, Technology and Research - Pharos Program SERC
Grant Reference no. : 1527200022

This research / project is supported by the Agency for Science, Technology and Research - Industry Alignment Fund - Pre-Positioning (IAF-PP)
Grant Reference no. : A19D9a0096

This research / project is supported by the Agency for Science, Technology and Research - AME Programmatic Fund, Accelerated Materials Development for Manufacturing Program
Grant Reference no. : A1898b0043

This research / project is supported by the Nanyang Technological University - Presidential Postdoctoral Fellowship
Grant Reference no. : 03INS000973C150

This work is also supported by:- 1) Japan Society for the Promotion of Science (JSPS) KAKENHI, Grant JP 19F19057 2) International Research Fellowship of JSPS 3) Chinese Scholarship Council (CSC) for the scholarship in Tokyo Institute of Technology
Description:
ISSN:
2041-1723
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