Abstract
We study the anharmonic phonon interactions in the single-crystal semiconducting (α) and metal-like (β) van der Waals In2Se3 layers, through the determination and analysis of temperature-dependent Raman spectra and thermal conductivities, supported by first-principles calculations of phonon band structures. Our results indicate strong lattice anharmonicity in β-In2Se3 giving rise to significant phonon peak broadening and a suppressed lattice thermal conductivity and reveal that the anharmonic phonon interactions are the main thermal transport-limiting mechanism in both phases. The low thermal conductivity combined with a large electrical conductivity makes the metal-like β-In2Se3 a potential efficient thermoelectric material.
Recommended Citation
J. Igo et al., "Anharmonic Phonon Coupling in Single-Crystal Semiconducting and Metal-Like Van Der Waals In2Se3," Journal of Physical Chemistry C, vol. 122, no. 40, pp. 22849 - 22855, American Chemical Society, Oct 2018.
The definitive version is available at https://doi.org/10.1021/acs.jpcc.8b06247
Department(s)
Electrical and Computer Engineering
International Standard Serial Number (ISSN)
1932-7455; 1932-7447
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 American Chemical Society, All rights reserved.
Publication Date
11 Oct 2018
Comments
National Science Foundation, Grant W911NF-17-1-0511