A Scattering-Mediated Acoustic Mismatch Mode for the Prediction of Thermal Boundary Resistance

摘要

Solid-solid thermal boundary resistance (R_b) plays an important role in determining heat flow, both in cryogenic and room-temperature applications, such as very large scale integrated circuitry, superlattices, and superconductors. The acoustic mismatch model (AMM) and the related diffuse mismatch model (DMM) describe the thermal transport at a solid-solid interface below a few Kelvin quite accurately. At moderate cryogenic tem- peratures and above, R_b is dominated by scattering caused by various sources, such as damage in the dielectric substrates and formation of an imperfect boundary layer near the interface, making R_b larger than that predicted by AMM and DMM.