Two-temperature time-fractional model for electron-phonon coupled interfacial thermal transport
Two-temperature time-fractional model for electron-phonon coupled interfacial thermal transport
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DOI：
10.1016/j.ijheatmasstransfer.2022.123759
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发表时间：
2022-12-15
影响因子：
5.2
通讯作者：
Wang，Yan
中科院分区：
文献类型：
--
作者：
Mozafarifard，Milad;Liao，Yiliang;Wang，Yan
这项研究研究了飞秒激光脉冲下异质系统中的电子-声子耦合热传输。提出了基于 Caputo 分数阶导数的二温时间分数 (2T-TF) 模型，并根据实验数据和二温玻尔兹曼输运方程 (2T-BTE) 结果进行了验证。 2T-TF 模型被证明比基于傅立叶定律的扩散二温 (2T) 模型更准确，而其复杂度可以远低于 2T-BTE 模拟。此外，各种形式的热阻可以很容易地应用到 2T-TF 模型中。使用多层金属-非金属薄膜作为模型系统，我们证明了我们的 2T-TF 模型可以可靠地预测金属-金属和金属-非金属界面上的电子-声子耦合热传输，以及超快激光照射后顶部金属层的电子冷却。 2T-TF 模型可以作为一种方便可靠的工具，用于模拟异质系统中的电子-声子耦合热传输，这种系统在激光制造和微/纳米电子设备中广泛存在。
This research investigates electron-phonon coupled thermal transport in heterogeneous systems under femtosecond laser pulses. A two-temperature time-fractional (2T-TF) model based on the Caputo fractional derivative is presented, which is validated against experimental data and two-temperature Boltzmann transport equation (2T-BTE) results. The 2T-TF model is demonstrated to be more accurate than the diffusive two-temperature (2T) model based on Fourier's law, while its complexity can be much lower than 2T-BTE simulations. Moreover, various forms of thermal resistances can be readily implemented to the 2T-TF model. Using multi-layer metal-nonmetal thin films as model systems, we demonstrate that our 2T-TF model can reliably predict electron-phonon coupled thermal transport across metal-metal and metal-nonmetal interfaces as well as electron cooling in the top metallic layer after ultrafast laser irradiation. The 2T-TF model can serve as a convenient and reliable tool for simulating electron-phonon coupled thermal transport in heterogeneous systems that are vastly seen in laser manufacturing and micro-/nano-electronic devices.