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Increase of thermal resistance between a nanostructure and a surface due to phonon multireflections

The thermal resistance between a nanostructure and a half-body is calculated in the framework of particle-phonons physics. The current models approximate the nanostructure as a thermal bath. We prove that the multireflections of heat carriers in the nanostructure significantly increase resistance, in contradiction with former predictions. This increase depends on the shape of the nanostructure and the heat carrier’s mean-free path only. We provide a general and simple expression for the contact resistance and examine the specific cases of nanowires and nanoparticles.