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Material Sciences 2020
有序Bi2Te3纳米柱阵列结构及其热电性能研究
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Abstract:
本文研究发现有序纳米柱阵列结构能大幅提升热电材料的性能。在此，利用真空镀膜成功制备了有序纳米柱阵列结构Bi2Te3薄膜。利用电子衍射与扫描电镜等对材料的成分与结构进行了检测，并对材料的电导与Seebeck系数以及热导等性能进行了测试。结果表明它具有(0 1 5)晶面高度择优生长，ZT值在室温高达1.06。有序的晶面或界面对提高载流子迁移率有贡献，而这些大量的边界或界面以及晶界可以增加声子的散射，降低热导，从而大幅提升了材料的热电性能。因此，纳米柱阵列结构的引入是提升热电材料性能的十分有效途径。
In this paper, it is found that the ordered nanopillar array structure can greatly enhance the thermoelectric property of materials. The ordered Bi2Te3 nanopillar array was successfully achieved by vacuum coating. The composition and the microstructure of the films are studied by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray spectroscopy. The in-plane thermoelectric properties, i.e., electrical conductivity and Seebeck coefficient and thermal conductivity of the films were measured. It shows that a preferential (0 1 5) growth and ZT=1.06 are obtained at room temperature in the nanopillar array. The novel ordered lattice planes and interfaces can favorably influence the carrier mobility. Lots of interfaces and grain boundaries will block the transport of phonon, hence decreasing the thermal conductivity and increasing thermoelectric property. Introduction of such ordered nanopillar array structure into films is therefore a very promising approach.
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