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- W4292191016 abstract "Intrinsically low lattice thermal conductivity (κlat ) while maintaining the high carrier mobility (μ) is of the utmost importance for thermoelectrics. Topological insulators (TI) can possess high μ due to the metallic surface states. TIs with heavy constituents and layered structure can give rise to high anharmonicity and are expected to show low κlat . Here, we demonstrate that Bi1.1 Sb0.9 Te2 S (BSTS), which is a 3D bulk TI, exhibits ultra-low κlat of 0.46 Wm-1 K-1 along with high μ of ≈401 cm2 V-1 s-1 . Sound velocity measurements and theoretical calculations suggest that chemical bonding hierarchy and high anharmonicity play a crucial role behind such ultra-low κlat . BSTS possesses low energy optical phonons which strongly couple with the heat carrying acoustic phonons leading to ultra-low κlat . Further, Cl has been doped at the S site of BSTS which increases the electron concentration and reduces the κlat resulting in a promising n-type thermoelectric figure of merit (zT) of ≈0.6 at 573 K." @default.
- W4292191016 created "2022-08-18" @default.
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- W4292191016 date "2022-09-02" @default.
- W4292191016 modified "2023-10-01" @default.
- W4292191016 title "Strong Anharmonicity‐Induced Low Thermal Conductivity and High n‐type Mobility in the Topological Insulator Bi <sub>1.1</sub> Sb <sub>0.9</sub> Te <sub>2</sub> S" @default.
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- W4292191016 doi "https://doi.org/10.1002/anie.202210783" @default.
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