Ag、Cu掺杂的Bi₂Te₃热电材料的制备及特性研究

Preparation and Properties of Ag, Cu Doped Bi₂Te₃ Thermoelectric Material

摘要: 采用粉末热压烧结工艺制备了纯Bi₂Te₃及少量Ag、Cu元素掺杂的Bi₂Te₃片状热电材料。利用XRD、SEM、EDS及热电特性实验分析设备，对不同热电样品的晶体结构、表面形貌、组成成份及热电特性进行了比较分析。研究发现，适量的Ag、Cu元素掺杂确实可提升Bi₂Te₃材料的热电特性，相比Cu元素掺杂，Ag掺杂的Bi₂Te₃样品热电特性改善最大。在样品高温端温度为356 K条件下，掺杂Ag为0.1 wt%的样品Seebeck系数最大，约为−193.26 μV/K，ZT值也最大，约为1.04。

Abstract: Pure Bi₂Te₃ and the Ag and Cu doped Bi₂Te₃ sheet thermoelectric material samples with different mass percentage were prepared by powder hot-pressing sintering method. The crystal structure, surface morphology, composition and thermoelectric properties of the synthesized samples were analyzed by XRD, SEM, EDS and the self-made thermoelectric characteristic testing equipment. It is found that the appropriate amount of Ag and Cu element doping into Bi₂Te₃ thermoelectric material can indeed improve its thermoelectric properties. Compared with the sample doped with Cu element, the Ag doped Bi₂Te₃ sample showed the best improvement in the thermoelectric proper-ties. Under the condition that the testing temperature is 356 K, the Seebeck coefficient of Bi₂Te₃ sample doped Ag element with 0.1 wt% is the largest, which is about −193.26 μV/K, and its Zt value is also the largest, which is about 1.04.