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Issue 27, 2018
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Unusually low thermal conductivity of atomically thin 2D tellurium

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Tellurium is a high-performance thermoelectric material due to its superior electronic transport and low lattice thermal conductivity (κL). Here, we report the ultralow κL in the monolayer tellurium, i.e., tellurene, which has been successfully synthesized in recent experiments. We find that tellurene has a compellingly low room temperature κL of 2.16 and 4.08 W m−1 K−1 along the armchair and zigzag directions, respectively, which is lower than any reported values for other 2D materials. We attribute this unusually low κL to the soft acoustic modes, the extremely low-energy optical modes and the strong scattering among optical–acoustic phonons, which place tellurene as a potential novel thermoelectric material. Finally, we show that κL is proportional to the largest acoustic phonon frequency (ωaD) and the lowest optical phonon frequency at the Γ point (ωoΓ) in 2D materials, which reflect both harmonic and anharmonic thermal properties, respectively.

Graphical abstract: Unusually low thermal conductivity of atomically thin 2D tellurium

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Publication details

The article was received on 27 Feb 2018, accepted on 25 Apr 2018 and first published on 27 Apr 2018

Article type: Paper
DOI: 10.1039/C8NR01649F
Citation: Nanoscale, 2018,10, 12997-13003

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    Unusually low thermal conductivity of atomically thin 2D tellurium

    Z. Gao, F. Tao and J. Ren, Nanoscale, 2018, 10, 12997
    DOI: 10.1039/C8NR01649F

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