Ultrahigh zT from strong electron-phonon interactions and a low-dimensional Fermi surface

V. K. Ranganayakulu, Te Hsien Wang, Cheng Lung Chen, Angus Huang, Ma Hsuan Ma, Chun Min Wu, Wei Han Tsai, Tsu Lien Hung, Min Nan Ou, Horng Tay Jeng, Chih Hao Lee, Kuei Hsien Chen, Wen Hsien Li, Madison K. Brod, G. Jeffrey Snyder, Yang Yuan Chen

研究成果: 雜誌貢獻期刊論文同行評審

2 引文 斯高帕斯(Scopus)

摘要

The outstanding thermoelectric performance of GeTe has attracted significant attention in the research community in recent years. However, many of the underlying physical mechanisms that contribute to GeTe's exceptionally high figure of merit (zT) remain not fully understood. In this study, an Sb-Bi codoped GeTe single crystal (Ge0.86Sb0.08Bi0.06)Te with an ultrahigh zT of 2.7 at 700 K and a record high device zT of 1.41 in the temperature range of 300-773 K was synthesized and investigated. The ultrahigh zT is attributed to the extremely low lattice thermal conductivity induced by strong electron-phonon (EP) interactions as revealed by the experimentally observed Kohn anomaly, through inelastic neutron scattering (INS) measurements. First-principles calculations further demonstrate that the remarkable EP interaction arises from the Fermi surface nesting featured in a one-dimensional (double-walled) topology. Our finding unravels the ultrahigh-zT mechanism in GeTe-based materials, serving as an inspiring guide toward high thermoelectric performance.

原文???core.languages.en_GB???
頁(從 - 到)1904-1915
頁數12
期刊Energy and Environmental Science
17
發行號5
DOIs
出版狀態已出版 - 27 1月 2024

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