Thermal boundary conductance across solid–solid interfaces at high temperatures: A microscopic approach
Jinxin Zhong, Qing Xi, Zhiguo Wang, Tsuneyoshi Nakayama, Xiaobo Li, Jùn Líu, Jun Zhou
Abstract
The existing theories for the thermal boundary conductance (TBC) of solid–solid interfaces lead to diverse values deviating from experimental measurements. In this paper, we propose a simple mechanism to evaluate the TBC contributed by phonons at room temperatures, where the microscopic structure of the interface layers between two dissimilar solids is treated as amorphous by taking into account the mismatches of the elastic modulus, the atomic masses, and the lattice spacing. Our theory explains well the observed magnitude of the TBCs across various solid–solid interfaces in the range from 107 to 109Wm−2K−1. The coordination number density and the energy transfer coefficient across interfaces are key parameters for determining the TBCs.