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Title: New insight into the material parameter B to understand the enhanced thermoelectric performance of Mg2Sn1-x-yGexSby

Abstract

Historically, a material parameter B incorporating weighted mobility and lattice thermal conductivity has guided the exploration of novel thermoelectric materials. However, the conventional definition of B neglects the bipolar effect which can dramatically change the thermoelectric energy conversion efficiency at high temperatures. A generalized material parameter B* is derived, which connects weighted mobility, lattice thermal conductivity, and the band gap. Based on the new parameter B*, we explain the successful tuning of the electron and phonon transport in Mg2Sn1-x-yGexSby, with an improved ZT value from 0.6 in Mg2Sn0.99Sb0.01 to 1.4 in Mg2Sn0.73Ge0.25Sb0.02. We uncover that the Ge alloying approach simultaneously improves all the key variables in the material parameter B*, with an ~25% enhancement in the weighted mobility, ~27% band gap widening, and ~50% reduction in the lattice thermal conductivity. We show that a higher generalized parameter B* leads to a higher optimized ZT in Mg2Sn0.73Ge0.25Sb0.02, and some common thermoelectric materials. The new parameter B* provides a better characterization of material's thermoelectric transport, particularly at high temperatures, and therefore can facilitate the search for good thermoelectric materials.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Univ. of Houston, TX (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1371019
Grant/Contract Number:  
SC0001299; FG02-09ER46577
Resource Type:
Accepted Manuscript
Journal Name:
Energy & Environmental Science
Additional Journal Information:
Journal Volume: 9; Journal Issue: 2; Journal ID: ISSN 1754-5692
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Liu, Weishu, Zhou, Jiawei, Jie, Qing, Li, Yang, Kim, Hee Seok, Bao, Jiming, Chen, Gang, and Ren, Zhifeng. New insight into the material parameter B to understand the enhanced thermoelectric performance of Mg2Sn1-x-yGexSby. United States: N. p., 2015. Web. doi:10.1039/C5EE02600H.
Liu, Weishu, Zhou, Jiawei, Jie, Qing, Li, Yang, Kim, Hee Seok, Bao, Jiming, Chen, Gang, & Ren, Zhifeng. New insight into the material parameter B to understand the enhanced thermoelectric performance of Mg2Sn1-x-yGexSby. United States. https://doi.org/10.1039/C5EE02600H
Liu, Weishu, Zhou, Jiawei, Jie, Qing, Li, Yang, Kim, Hee Seok, Bao, Jiming, Chen, Gang, and Ren, Zhifeng. Thu . "New insight into the material parameter B to understand the enhanced thermoelectric performance of Mg2Sn1-x-yGexSby". United States. https://doi.org/10.1039/C5EE02600H. https://www.osti.gov/servlets/purl/1371019.
@article{osti_1371019,
title = {New insight into the material parameter B to understand the enhanced thermoelectric performance of Mg2Sn1-x-yGexSby},
author = {Liu, Weishu and Zhou, Jiawei and Jie, Qing and Li, Yang and Kim, Hee Seok and Bao, Jiming and Chen, Gang and Ren, Zhifeng},
abstractNote = {Historically, a material parameter B incorporating weighted mobility and lattice thermal conductivity has guided the exploration of novel thermoelectric materials. However, the conventional definition of B neglects the bipolar effect which can dramatically change the thermoelectric energy conversion efficiency at high temperatures. A generalized material parameter B* is derived, which connects weighted mobility, lattice thermal conductivity, and the band gap. Based on the new parameter B*, we explain the successful tuning of the electron and phonon transport in Mg2Sn1-x-yGexSby, with an improved ZT value from 0.6 in Mg2Sn0.99Sb0.01 to 1.4 in Mg2Sn0.73Ge0.25Sb0.02. We uncover that the Ge alloying approach simultaneously improves all the key variables in the material parameter B*, with an ~25% enhancement in the weighted mobility, ~27% band gap widening, and ~50% reduction in the lattice thermal conductivity. We show that a higher generalized parameter B* leads to a higher optimized ZT in Mg2Sn0.73Ge0.25Sb0.02, and some common thermoelectric materials. The new parameter B* provides a better characterization of material's thermoelectric transport, particularly at high temperatures, and therefore can facilitate the search for good thermoelectric materials.},
doi = {10.1039/C5EE02600H},
journal = {Energy & Environmental Science},
number = 2,
volume = 9,
place = {United States},
year = {Thu Nov 12 00:00:00 EST 2015},
month = {Thu Nov 12 00:00:00 EST 2015}
}

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