Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe 2

Roychowdhury, Subhajit ; Ghosh, Tanmoy ; Arora, Raagya ; Samanta, Manisha ; Xie, Lin ; Singh, Niraj Kumar ; Soni, Ajay ; He, Jiaqing ; Waghmare, Umesh V. ; Biswas, Kanishka (2021) Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe 2 Science, 371 (6530). pp. 722-727. ISSN 0036-8075

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Official URL: http://doi.org/10.1126/science.abb3517

Related URL: http://dx.doi.org/10.1126/science.abb3517

Abstract

High thermoelectric performance is generally achieved through either electronic structure modulations or phonon scattering enhancements, which often counteract each other. A leap in performance requires innovative strategies that simultaneously optimize electronic and phonon transports. We demonstrate high thermoelectric performance with a near room-temperature figure of merit, ZT ~ 1.5, and a maximum ZT ~ 2.6 at 573 kelvin, by optimizing atomic disorder in cadmium-doped polycrystalline silver antimony telluride (AgSbTe2). Cadmium doping in AgSbTe2 enhances cationic ordering, which simultaneously improves electronic properties by tuning disorder-induced localization of electronic states and reduces lattice thermal conductivity through spontaneous formation of nanoscale (~2 to 4 nanometers) superstructures and coupling of soft vibrations localized within ~1 nanometer around cadmium sites with local strain modulation. The strategy is applicable to most other thermoelectric materials that exhibit inherent atomic disorder.

Item Type:Article
Source:Copyright of this article belongs to American Association for the Advancement of Science
ID Code:128072
Deposited On:03 Nov 2022 05:42
Last Modified:18 Aug 2023 10:28

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