Year: 2021
Type: article
Abstract: The lattice thermal conductivity in van der Waals crystal selenium is investigated by solving the phonon Boltzmann transport equation combined with the first-principles calculations. The lattice thermal conductivity of selenium along the perpendicular to the chain direction is extremely low, which is 5 times lower than the conductivity in the parallel direction, showing a clear quasi-one-dimensional heat transfer feature. The small phonon group velocity, acoustic-optical phonon branches mixing and bonding anharmonicity along the perpendicular to the chain direction contribute to the high anisotropy in thermal conductivity. Moreover, particles with several nanometers can introduce boundary scattering to a large portion of phonons modes in selenium, where the lattice thermal conductivity is greatly reduced. Both the unique one-dimensional thermal transport property and low thermal conductivity make selenium to be a potential thermal management in thermoelectric and other electronic technologies.
Institutions: University of Jinan, Shandong Normal University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Award: 链式结构单质Te和Se中电声输运机制及热电性能优化的研究
OpenAlex ID: W3193253080