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Ultralow Lattice Thermal Conductivity and Enhanced Thermoelectric Performance in SnTe:Ga Materials

Title
Ultralow Lattice Thermal Conductivity and Enhanced Thermoelectric Performance in SnTe:Ga Materials
Authors
Orabi, Rabih Al Rahal AlHwang, JunphilLin, Chan-ChiehGautier, RegisFontaine, BrunoKim, WoochulRhyee, Jong-SooWee, DaehyunFornari, Marco
Ewha Authors
위대현
SCOPUS Author ID
위대현scopus
Issue Date
2017
Journal Title
CHEMISTRY OF MATERIALS
ISSN
0897-4756JCR Link1520-5002JCR Link
Citation
vol. 29, no. 2, pp. 612 - 620
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Ultralow thermal conductivity is of great interest in a variety of fields, including thermoelectric energy conversion. We report, for the first time, experimental evidence that Ga-doping in SnTe may lower the lattice thermal conduction slightly below the theoretical amorphous minimum at high temperature. Such an effect is justified by the spontaneous formation of nanoprecipitates we characterized as GaTe. Remarkably, the introduction of Ga (2-10%) in SnTe also improves the electronic transport properties by activating several hole pockets in the multivalley valence band. Experimental results are supported by density functional theory calculations. The thermoelectric figure of merit, ZT, reaches similar to 1 at 873 K in Sn0.96Ga0.07Te, which corresponds to an similar to 80% improvement with respect to pure SnTe.
DOI
10.1021/acs.chemmater.6b04076
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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