THERMAL BEHAVIOR IN A MULTI-LAYER METAL THIN-FILM WITH INTERFACIAL CONTACT CONDUCTANCE BY THE PARABOLIC TWO-STEP MODEL

摘要

The effect of the contact conductance on micro-scale heat transport in a multi-layered metal thin-film subjected to ultra-fast pulse laser heating is investigated in this study. The interfacial contact conductance existing at the interface is included in the analysis. The parabolic two-step (PTS) model is applied to predict the electron and lattice temperature. The equations can be solved by Laplace transform and the Riemann-sum approximation. The results show that the contact conductance plays an important role in the micro-scale heat transport processes for a multi-layered metal thin-film. Hence, in order to eliminate the thermal failure of the surface layer, the thermal resistance existing at the interface should be as small as possible.