拓扑绝缘体人工微结构材料的热电效应与原型器件研究

项目名称： 拓扑绝缘体人工微结构材料的热电效应与原型器件研究

项目编号： No.51472114

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 陈延峰

作者单位： 南京大学

项目金额： 90万元

中文摘要： 利用纳米结构可以对热电材料的性能进行非常有效的改善，与此同时，理论上预计，拓扑绝缘体独特的电子拓扑特性对于热电材料性能的提升，也是一个可能的机遇。基于上述考虑，本项目拟主要利用磁控溅射方法，生长高质量的拓扑绝缘体薄膜和超晶格结构；基于理论分析，并通过系统的材料表征和热电性能测试实验，寻找拓扑态与热电性质的内在联系，建立拓扑绝缘体纳米结构的拓扑态电子影响热电性能的理论模型；在理论计算的基础上，并借助微加工工艺，设计和制备可能提高材料热电性能的人工微结构，以期最大限度地提高热电转化效率。最后，设计和制备具有高热电转化效率的热电原型器件，为拓扑绝缘体在热电领域的应用打下基础。

中文关键词： 热电材料；拓扑绝缘体；人工微结构；纳米结构

英文摘要： It has been proved widely that the thermoelectric properties have been much improved in nano-scale materials. Meanwhile the unique properties of topological states in topological insulator pave the way for revolutionary progress in this field, as has also been demonstrated theoretically. By combining these two approaches, it is expected that we can further enhance the thermoelectric efficiency. In this proposal, we intend to grow high-quality topological insulator in nanoscale, especially thin-films and superlattice structures, by means of advanced magnetron sputtering system. The artificial structured films and superlattices will be characterized roundly and their electrical and thermal properties will be measured in our home-made systems. We also plan to explore the intrinsic relation between topological states and thermoelectric efficiency, which will make contributions in both basic research and energy applications. On the basis of theoretical models, we will design and fabricate artificial microstructures to improve the thermoelectric efficiency of topological insulators for the expected high-performance. At last, thermoelectric prototype devices will be fabricated for their extensive applications in the field of renewable energy resources.

英文关键词： Thermoelectric materials;topological insulator;artificial microstructure;nano structure