期刊
NANO LETTERS
卷 21, 期 21, 页码 9172-9179出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c03018
关键词
Phonon transport; mean free path; SnSe2; thermal conductivity anisotropy; frequency-domain thermoreflectance; Raman thermometry
类别
资金
- Severo Ochoa program
- Spanish Research Agency (AEI) [SEV-2017-0706]
- CERCA Programme/Generalitat de Catalunya
- Spanish MICINN Project SIP [PGC2018-101743-B-I00]
- EU Project NANOPOLY [GA 289061]
- Flag-Era JTC 2017 Project MELODICA
- EU Marie Sklodowska-Curie COFUND PREBIST [754558]
The study systematically investigated the thermal conductivity of SnSe2 films of varying thickness, revealing a thermal conductivity anisotropy and a decrease in thermal conductivity with decreasing film thickness. Phonon contributions to the thermal conductivity were also identified using the mean free path reconstruction method.
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 similar to 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 similar to 1 to 53 and from 1 to 30 nm contribute to 50% of the total in-plane and cross-plane thermal conductivity, respectively.
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