Wu Cheng-Wei, Pan Hui, Zeng Yu-Jia, Zhou Wu-Xing, Chen Ke-Qiu, Zhang Gang
School of Materials Science and Engineering & Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology, Xiangtan 411201, China.
Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China.
Nanoscale. 2023 Apr 6;15(14):6732-6737. doi: 10.1039/d2nr05954a.
Improving the interfacial thermal conductance (ITC) is very important for heat dissipation in microelectronic and optoelectronic devices. In this work, taking GaN-AlN contact as an example, we demonstrated a new mechanism to enhance the interfacial thermal conductance using nano-phononic metamaterials. First, how a superlattice affects the ITC is investigated, and it is found that with decreasing superlattice periodic length, the ITC first decreases and then increases, because of the coherent phonon interference effect. However, although constructing a superlattice is effective for tuning the ITC, it cannot enhance the ITC. We suggest that the ITC can be enhanced by 9% through constructing an interfacial nano phononic metamaterial, which is contributed by the additional phonon transport channels for high-frequency phonons with a wide incidence-angle range. These results not only establish a deep understanding of the fundamental physics of the interfacial thermal conductance, but also provide a robust and scalable mechanism, which provides a degree of freedom for efficient thermal management.
提高界面热导率（ITC）对于微电子和光电器件的散热非常重要。在这项工作中，以GaN-AlN接触为例，我们展示了一种使用纳米声子超材料增强界面热导率的新机制。首先，研究了超晶格如何影响ITC，发现随着超晶格周期长度的减小，由于相干声子干涉效应，ITC先减小后增大。然而，尽管构建超晶格对调节ITC有效，但它不能增强ITC。我们表明，通过构建界面纳米声子超材料可以将ITC提高9%，这是由具有宽入射角范围的高频声子的额外声子传输通道促成的。这些结果不仅对界面热导率的基本物理有了深入理解，还提供了一种强大且可扩展的机制，为高效热管理提供了一个自由度。
