n-type thermoelectric material Mg 2 Sn 0.75 Ge 0.25 for high power generation

Liu, Weishu; Kim, Hee Seok; Chen, Shuo; Jie, Qing; Lv, Bing; Yao, Mengliang; Ren, Zhensong; Opeil, Cyril P.; Wilson, Stephen; Chu, Ching-Wu; Ren, Zhifeng

doi:10.1073/pnas.1424388112

n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation

Journal Article · Sun Mar 01 23:00:00 EST 2015 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1424388112· OSTI ID:1235173

Liu, Weishu ^[1]; Kim, Hee Seok ^[1]; Chen, Shuo ^[1]; Jie, Qing ^[1]; Lv, Bing ^[1]; Yao, Mengliang ^[2]; Ren, Zhensong ^[2]; Opeil, Cyril P. ^[2]; Wilson, Stephen ^[2]; Chu, Ching-Wu ^[3]; Ren, Zhifeng ^[1]

Department of Physics and, Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002,
Department of Physics, Boston College, Chestnut Hill, MA 02467, and
Department of Physics and, Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5002,, Lawrence Berkeley National Laboratory, Berkeley, CA 94720

Significance

Thermoelectric materials have been extensively studied for applications in conversion of waste heat into electricity. The efficiency is related to the figure-of-merit, ZT = ( S ² σ / κ ) T , where S , σ , and κ are the Seebeck coefficient, electrical conductivity, and thermal conductivity, respectively. Pursuing higher ZT for higher efficiency has been the focus by mainly reducing the thermal conductivity. In this paper, we point out, for a given ZT , higher power factor ( S ² σ ) should be pursued for achieving more power because power is determined by ( T _h − T _c ) ² ( S ² σ )/ L , where T _h , T _c , and L are the hot and cold side temperatures, and leg length, respectively. We found a new material, Mg ₂ Sn _0.75 Ge _0.25 , having both high ZT and high power factor.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0005806

OSTI ID:: 1235173

Alternate ID(s):: OSTI ID: 1210660
OSTI ID: 1385305

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 11 Vol. 112; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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n-type thermoelectric material Mg 2 Sn 0.75 Ge 0.25 for high power generation

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n-type thermoelectric material Mg ₂ Sn _0.75 Ge _0.25 for high power generation