Thermal conductance of interfaces and the thermal conductivity of multilayer materials
Catalin Chiritescu, Yee Kan Koh and David G. Cahill
ONR N00014-07-1-0190
We are studying the transport of heat across solid-solid interfaces and
the thermal conductivity of nanostructured materials. Our objective is
to explore the connections between interface structure and transport;
and the possibility of producing materials with a significant fraction of
localized vibrational modes. The thermal conductivity of thin films, multilayers, and individual interfaces are characterized by picosecond time-domain thermoreflectance (TDTR). We have recently observed ultralow thermal conductivities in nanoscale multilayers of refractory metals and alumina; and in thin films of disordered layered crystals, e.g., WSe2 prepared by sequential evaporation of the elements. The frequency dependence of the thermal conductivity measured by TDTR is used to determine the distribution of phonon mean-free-paths in epitaxial semiconductors.
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