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oai:recercat.cat:2072/4642572026-03-13T10:31:59Zcom_2072_98col_2072_378192

Anisotropic thermal conductivity of crystalline layered SnSe2 Xiao, Peng Chávez Ángel, Emigdio Chaitoglou, Stefanos Sledzinska, Marianna Dimoulas, Athanasios Sotomayor Torres, Clivia M. Sachat, Alexandros el Phonon transport Mean free path SnSe2 Thermal conductivity anisotropy Frequency-domain thermoreflectance Raman thermometry Altres ajuts: this work has been supported by the CERCA Programme/Generalitat de Catalunya. The degree of thermal anisotropy affects critically key device-relevant properties of layered two-dimensional materials. Here, we systematically study the in-plane and cross-plane thermal conductivity of crystalline SnSe2 films of varying thickness (16-190 nm) and uncover a thickness-independent thermal conductivity anisotropy ratio of about ∼8.4. Experimental data obtained using Raman thermometry and frequency domain thermoreflectance showed that the in-plane and cross-plane thermal conductivities monotonically decrease by a factor of 2.5 with decreasing film thickness compared to the bulk values. Moreover, we find that the temperature-dependence of the in-plane component gradually decreases as the film becomes thinner, and in the range from 300 to 473 K it drops by more than a factor of 2. Using the mean free path reconstruction method, we found that phonons with MFP ranging from ∼1 to 53 and from 1 to 30 nm contribute to 50% of the total in-plane and cross-plane thermal conductivity, respectively. 2021 Article European Commission 754558 European Commission 289061 Agencia Estatal de Investigación SEV-2017-0706 Agencia Estatal de Investigación PGC2018-101743-B-I00 Nano letters ; Vol. 21, issue 21 (Nov. 2021), p. 9172-9179 open access Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. https://creativecommons.org/licenses/by-nc-nd/4.0/