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Abstract
We employ advanced first principles methodology, merging self-consistent phonon theory and the Boltzmann transport equation, to comprehensively explore the thermal transport and thermoelectric properties of KCdAs. Notably, the study accounts for the impact of quartic anharmonicity on phonon group velocities in the pursuit of lattice thermal conductivity and investigates 3ph and 4ph scattering processes on phonon lifetimes. Through various methodologies, including examining atomic vibrational modes and analyzing 3ph and 4ph scattering processes, the article unveils microphysical mechanisms contributing to the low κL within KCdAs. Key features include significant anisotropy in Cd atoms, pronounced anharmonicity in K atoms, and relative vibrations in non-equivalent As atomic layers. Cd atoms, situated between As layers, exhibit rattling modes and strong lattice anharmonicity, contributing to the observed low κL. Remarkably flat bands near the valence band maximum translate into high PF, aligning with ultralow κL for exceptional thermoelectric performance. Under optimal temperature and carrier concentration doping, outstanding ZT values are achieved: 4.25 (a(b)-axis, p-type, 3 × 1019 cm−3, 500 K), 0.90 (c-axis, p-type, 5 × 1020 cm−3, 700 K), 1.61 (a(b)-axis, n-type, 2 × 1018 cm−3, 700 K), and 3.06 (c-axis, n-type, 9 × 1017 cm−3, 700 K).
Keywords
anharmonic lattice dynamics
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electron transport characteristics
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first principles calculation
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lattice thermal transport
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octahedron
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thermoelectric properties
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Yue Wang, Yinchang Zhao, Jun Ni, Zhenhong Dai.
Effects of Rattling Behavior of K and Cd Atoms along Different Directions in Anisotropic KCdAs on Lattice Thermal Transport and Thermoelectric Properties.
Energy & Environmental Materials, 2024, 7(6): e12764 DOI:10.1002/eem2.12764
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