Bi2Te3低维纳米材料的Na掺杂及电学和热学性能研究

提高Bi2Te3的电导率、降低其热导率对提高Bi2Te3的热电性能以及Bi2Te3基热电器件的研制与应用具有重要的科学意义。本项目基于Bi2Te3低维纳米化和Na在Bi2Te3掺杂中的特殊性能，以获得高电导率和低热导率的Na掺杂Bi2Te3低维纳米材料为目标，提出了溶剂热法制备Na掺杂Bi2Te3纳米材料，研究不同Na掺杂浓度对Bi2Te3纳米材料的微观结构、能带结构、载流子和声子的影响规律，揭示Na掺杂浓度对Bi2Te3电学和热学性能的影响机制，为高质量Na掺杂Bi2Te3纳米材料的制备及性能调控提供实验和理论指导，为基于Na掺杂Bi2Te3纳米材料的高性能热电器件的研制及应用奠定基础。

Improving electrical property and decreasing thermal property of Bi2Te3 is a key issue for improving Bi2Te3 thermoelectric property, Bi2Te3-based thermoelectric device and its application. On the basis of unique properties of Bi2Te3 low-dimensional nanomaterials and Na in doping Bi2Te3, in this project, our aim is to prepare high crystal quality Na-doped Bi2Te3 nanomaterials with high electrical conductivity and low thermal conductivity via the solvothermal process. We will investigate the effect of different Na-doped concentration on the microstructure, energy band structure, carrier and phonon, we will reveal the mechanism of the effect of Na-doped concentration on the electrical property and thermal property.The results will offer useful experimental and theory basis for the synthesis of high crystal quality Na-doped Bi2Te3 nanomaterials with high electrical conductivity and low thermal conductivity. In addition, the obtained results can also be useful for the fabrication and applications of Bi2Te3-based thermoelectric devices.