Nanostructure, thermoelectric properties and transport theory of V2VI3 and V2VI3/IV-VI based superlatices

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The outstanding results reported by Venkatasubramanian1 for nanostructured V2VI3 - based thin film superlattice (SL) structures strongly fueled and renewed the interest in the development of efficient novel thermoelectric materials. Thus, the work in the first period of the project was focused on an independent clarification of the reported results by a comprehensive approach in order to gain more insight into the physical background of the high efficiency of those SL structures.In the second period of the project, the main focus of the work is set to epitaxial V2VI3 and epitaxial/nanoalloyed V2VI3 / IV-VI mixed superlattice thin films with enhanced thermal stability. The samples will be deposited on different substrates and jointly characterized with a combined approach that has proven well in the first period. Another point will be the fabrication of novel types of nanostructures, i.e. twodimensional nanoscale layers with one-dimensional nanoinclusions. The structure and composition of all materials need to be characterized at the nanoscale by state-of-the-art techniques, with particular emphasis on electron microscopy. Cooperations within and outside the SPP program are planned to enhance the networking of thermoelectric research. The results expected by the comprehensive approach should find practical application by helping to deduce design roles for better and/or new thermoelectric materials.