Thermal diffusivity measurements of superlattice films by an AC calorimetric method

摘要

Recently, it has been proposed that the superlattice structure reduces the lattice thermal conductivity perpendicular to superlattice interface, leading to the improvement of figure of merit of thermoelectric device. We developed a new method of thermal diffusivity measurement in order to prove the above mentioned effect of superlattice. We also applied photoacoustic method for evaluating thermophysical properties of thermoelectric materials.