Defect existing form and its evolution play an important role in the thermoelectric transport process. Here different forms of Pb into the SnSe system were introduced in order to improve the thermoelectric and mechanical properties of SnSe. Pb/SnSe samples were fabricated by vacuum melting, solid phase diffusion, spark plasma sintering and annealing treatment. The element valence mapping diagram and the X-ray photoelectron spectra (XPS) characteristic peaks of Pb show that a certain amount of elemental Pb exists in the initial state, and evolves into Pb²⁺ ion after annealing treatment. The micro-structure evolution leads to significant enhancement of the power factor and the ZT value. The power factor (PF) and the ZT value for Pb/SnSe increases to 623 μW/m/K² and 1.12 at 773 K after annealing treatment, respectively. Compared with SnSe matrix, the hardness and fracture toughness of Pb/SnSe samples increased by about 40% and 10%, respectively. Reasonable control of microstructure evolution is expected to be a design idea to improve thermoelectric and mechanical properties of SnSe.

缺陷的存在形式及其演化在热电传输过程中起着重要作用。此处，将不同形式的Pb引入SnSe系统中，以改善SnSe的热电和机械性能。通过真空熔融，固相扩散，火花等离子体烧结和退火处理制备了Pb / SnSe样品。Pb的元素价映射图和X射线光电子能谱（XPS）特征峰表明，在初始状态下存在一定量的Pb元素，经过退火处理后演变为Pb ²⁺离子。微观结构的演变导致功率因数和ZT值的显着提高。Pb / SnSe的功率因数（PF）和ZT值增加到623μW/ m / K ²退火处理后在773 K时的温度为1.12和1.12。与SnSe基质相比，Pb / SnSe样品的硬度和断裂韧性分别提高了约40％和10％。合理控制微结构的发展有望成为改善SnSe热电和机械性能的设计思路。