تقرير
Substrate-Dependence of Monolayer MoS$_2$ Thermal Conductivity and Thermal Boundary Conductance
| العنوان: | Substrate-Dependence of Monolayer MoS$_2$ Thermal Conductivity and Thermal Boundary Conductance |
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| المؤلفون: | Gabourie, Alexander J., Koroglu, Cagil, Pop, Eric |
| المصدر: | Journal of Applied Physics 131, 195103 (2022) |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | The thermal properties of two-dimensional (2D) materials, like MoS$_2$, are known to be affected by interactions with their environment, but this has primarily been studied only with SiO$_2$ substrates. Here, we compare the thermal conductivity (TC) and thermal boundary conductance (TBC) of monolayer MoS$_2$ on amorphous (a-) and crystalline (c-) SiO$_2$, AlN, Al$_2$O$_3$, and $\textit{h}$-BN monolayers using molecular dynamics. The room temperature TC of MoS$_2$ is ~38 Wm$^{-1}$K$^{-1}$ on amorphous substrates and up to ~68 Wm$^{-1}$K$^{-1}$ on crystalline substrates, with most of the difference due to substrate interactions with long-wavelength MoS$_2$ phonons (< 2 THz). An $\textit{h}$-BN monolayer used as a buffer between MoS$_2$ and the substrate causes the MoS$_2$ TC to increase by up to 50%. Length-dependent calculations reveal TC size effects below ~2 $\mu$m and show that the MoS$_2$ TC is size- but not substrate-limited below ~100 nm. We also find that the TBC of MoS$_2$ with c-Al$_2$O$_3$ is over twice that with c-AlN despite a similar MoS$_2$ TC on both, indicating that the TC and TBC could be tuned independently. Finally, we compare the thermal resistance of MoS$_2$ transistors on all substrates to show that MoS$_2$ TBC is the most important parameter for heat removal for long-channel (> 150 nm) devices, while TBC and TC are equally important for short channels. This work provides important insights for electro-thermal applications of 2D materials on various substrates. Comment: 16 Pages, 6 Figures, Supplementary Information |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0089247 |
| URL الوصول: | http://arxiv.org/abs/2204.11381 |
| رقم الأكسشن: | edsarx.2204.11381 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0089247 |
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