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

Venkatasubramanian1报道的纳米结构V2VI3薄膜超晶格（SL）结构的突出结果强烈地激发和重新激发了人们对开发高效新型热电材料的兴趣。因此，项目第一阶段的工作重点是通过综合方法对报告结果进行独立澄清，以便更深入地了解这些SL结构高效的物理背景。项目二期的主要工作重点是外延型V2VI3和外延/纳米合金V2VI3 / IV-VI混合超晶格薄膜的热稳定性增强。样品将沉积在不同的衬底上，并使用在第一阶段已被证明良好的联合方法共同表征。另一个重点将是新型纳米结构的制造，即带有一维纳米内含物的二维纳米级层。所有材料的结构和组成都需要通过最先进的技术，特别是电子显微镜，在纳米尺度上进行表征。计划在SPP项目内外开展合作，以加强热电研究的网络化。综合方法的预期结果应该通过帮助推断更好和/或新的热电材料的设计角色而找到实际应用。

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.