Títol:
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Anisotropic thermal conductivity of crystalline layered SnSe2
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Autor/a:
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Xiao, Peng; Chávez Ángel, Emigdio; Chaitoglou, Stefanos; Sledzinska, Marianna; Dimoulas, Athanasios; Sotomayor Torres, Clivia M.; Sachat, Alexandros el
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Abstract:
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Altres ajuts: this work has been supported by the CERCA Programme/Generalitat de Catalunya. |
Abstract:
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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. |
Data de publicació:
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13-12-2022 |
Matèries:
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-Phonon transport -Mean free path -SnSe2 -Thermal conductivity anisotropy -Frequency-domain thermoreflectance -Raman thermometry |
Drets:
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open access
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https://creativecommons.org/licenses/by-nc-nd/4.0/ |
Tipus de document:
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Article |
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Uri:
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https://ddd.uab.cat/record/268431
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