Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe<sub>2</sub>

doi:10.1126/science.abb3517

GSTDTAP > 气候变化

DOI	10.1126/science.abb3517
	Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe₂
	Subhajit Roychowdhury; Tanmoy Ghosh; Raagya Arora; Manisha Samanta; Lin Xie; Niraj Kumar Singh; Ajay Soni; Jiaqing He; Umesh V. Waghmare; Kanishka Biswas
	2021-02-12
发表期刊	Science
出版年	2021
英文摘要	Improving a thermoelectric material's ability to convert heat to electricity involves optimizing one property without changing another in a detrimental way. Roychowdhury et al. found that cadmium doping of silver antimony telluride enhances cationic ordering, which simultaneously improves electric properties and helpfully decreases thermal conductivity (see the Perspective by Liu and Ibáñez). This strategy markedly improves thermoelectric properties and could be used for other materials. Science , this issue p. [722][1]; see also p. [678][2] 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. [1]: /lookup/doi/10.1126/science.abb3517 [2]: /lookup/doi/10.1126/science.abg0886
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314090
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Subhajit Roychowdhury,Tanmoy Ghosh,Raagya Arora,et al. Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe₂[J]. Science,2021.
APA	Subhajit Roychowdhury.,Tanmoy Ghosh.,Raagya Arora.,Manisha Samanta.,Lin Xie.,...&Kanishka Biswas.(2021).Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe₂.Science.
MLA	Subhajit Roychowdhury,et al."Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe₂".Science (2021).