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First-Principles Prediction of Ultralow Lattice Thermal Conductivity of Dumbbell Silicene: A Comparison with Low-Buckled Silicene

中文摘要英文摘要

he dumbbell structure of two-dimensional group IV material offers alternatives to grow thin films for diverse applications. Thermal properties are important for these applications. We obtain the lattice thermal conductivity of low-buckled (LB) and dumbbell (DB) silicene by using first-principles calculations and the Boltzmann transport equation for phonons. For LB silicene, the calculated lattice thermal conductivity with naturally occurring isotope concentrations is 27.72 W/mK. For DB silicene, the calculated value is 2.86 W/mK. The thermal conductivity for DB silicene is much lower than LB silicene due to stronger phonon scattering. Our results will induce further theoretical and experimental investigations on the thermoelectric (TE) properties of DB silicene. The size-dependent thermal conductivity in both LB and DB silicene is investigated as well for designing TE devices. This work sheds light on the manipulation of phonon transport in two-dimensional group IV materials by dumbbell structure formed from the addition of adatoms.

he dumbbell structure of two-dimensional group IV material offers alternatives to grow thin films for diverse applications. Thermal properties are important for these applications. We obtain the lattice thermal conductivity of low-buckled [LB] and dumbbe

Shao, HZ [Shao, Hezhu][ 3 ]、Zhang, RJ [Zhang, Rongjun][ 1,2 ]、Xu, YF [Xu, Yuanfeng][ 1,2 ]、Zhang, H [Zhang, Hao][ 1,2 ]、Zhu, HY [Zhu, Heyuan][ 1,2 ]、Lu, HL [Lu, Hongliang][ 4 ]、Peng, B [Peng, Bo][ 1,2 ]、Zhang, DW [Zhang, David Wei][ 4 ]

10.12074/201705.00537V1

物理学材料科学工程基础科学

2D group IV materialssilicenephonon transportdumbbell structureBoltzmann transport equation

Shao, HZ [Shao, Hezhu][ 3 ],Zhang, RJ [Zhang, Rongjun][ 1,2 ],Xu, YF [Xu, Yuanfeng][ 1,2 ],Zhang, H [Zhang, Hao][ 1,2 ],Zhu, HY [Zhu, Heyuan][ 1,2 ],Lu, HL [Lu, Hongliang][ 4 ],Peng, B [Peng, Bo][ 1,2 ],Zhang, DW [Zhang, David Wei][ 4 ].First-Principles Prediction of Ultralow Lattice Thermal Conductivity of Dumbbell Silicene: A Comparison with Low-Buckled Silicene[EB/OL].(2017-05-02)[2025-05-21].https://chinaxiv.org/abs/201705.00537.点此复制

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