[15p-F206-1~14] 22.1 Joint Session M

▼ [15p-F206-3] Investigation on Heat Conduction on Phononic Crystal

〇(D)Yuxuan Liao¹, Takuma Shiga¹, Makoto Kashiwagi¹, Junichiro Shiomi^1,2 (1.Tokyo Univ., 2.NIMS)

Keywords:thermal conductivity, Phononic crystals, phonon

Phononic crystals (PnCs) are regarded as potential candidate of thermoelectric material because phononic structures can greatly reduce their thermal conductivity without altering the electrical property. Heat conduction in the PnCs is governed by both coherent (wave) phonon and incoherent (particle) phonon. In this work, in order to evaluate contributions of both coherent and incoherence phonons to heat conduction, we have employed the hybrid method to calculate the thermal conductivity of a 2D periodic silicon PnCs. As for the thermal conductivity of coherent phonon, we have performed lattice dynamics with phonon dispersion relation obtained from the Finite Element Method (FEM) and Klemens’ model for intrinsic phonon-phonon scattering. On the other hand, performing Monte Carlo ray-tracing method with phonon transport property in bulk Si, we calculated the thermal conductivity of incoherent phonon involving boundary scattering effect due to PnCs structure. In the conference, we will present the thermal conductivity obtained by hybrid method and compare the contributions of phonon coherent and incoherent effects to thermal conductivity at a temperature range of 4 K to 300 K.