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Pàgina inicial > Articles > Articles publicats > Anisotropic thermal conductivity of crystalline layered SnSe2 |
Data: | 2021 |
Resum: | 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. |
Ajuts: | European Commission 754558 European Commission 289061 Agencia Estatal de Investigación SEV-2017-0706 Ministerio de Ciencia e Innovación PGC2018-101743-B-I00 |
Nota: | Altres ajuts: this work has been supported by the CERCA Programme/Generalitat de Catalunya. |
Drets: | 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. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Phonon transport ; Mean free path ; SnSe2 ; Thermal conductivity anisotropy ; Frequency-domain thermoreflectance ; Raman thermometry |
Publicat a: | Nano letters, Vol. 21, issue 21 (Nov. 2021) , p. 9172-9179, ISSN 1530-6992 |
8 p, 3.6 MB |