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Thermoelectric materials with crystal-amorphicity duality induced by large atomic size mismatch
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DOI：10.1016/j.joule.2021.03.012.png)
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Abstract
En 中文
Discovering novel materials and attaining higher performance are the eternal pursuit of thermoelectric materials research. Here, we report a material series, (Cu1-xAgx)(2)(Te1-ySy) (0.16 <= x <= 0.24, 0.16 <= y <= 0.24), which (adopts )a complex orthorhombic structure differing from any known crystal structure of (Cu/Ag)(2)(S/Te). This material series is featured by the crystal-amorphicity duality induced by the large anionic size mismatch: a crystalline sublattice of highly size-mismatched anions Te/S coexists with an amorphous-like sublattice of cations Cu/Ag. In the context of structure-property correlation, the crystal-amorphicity duality gave rise to not only interesting electrical properties but also exceptionally low lattice thermal conductivities from 300 to 1,000 K. A state-of-the-art figure of merit zT of 2.0 is obtained in the x = y = 0.22 sample at 1,000 K These results give insights into crystal-amorphicity duality as a paradigm-shifting materials design approach to develop high-performance thermoelectric materials.
Keywords:
THERMAL-CONDUCTIVITY
PHASE-TRANSITIONS
PERFORMANCE
CHALCOGENIDES
TRANSPORT
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