Evolution of thermoelectric properties and anisotropic features of Bi2Te3 prepared by high pressure and high temperature

Evolution of thermoelectric properties and anisotropic features of Bi2Te3 prepared by high pressure and high temperature
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高压高温制备Bi2Te3热电性能及各向异性特征的演变

DOI:
10.1016/j.jallcom.2015.01.271
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发表时间:
2015-05
影响因子:
6.2
通讯作者:
邓乐
邓乐
中科院分区:
材料科学2区
文献类型:
--
作者:
张跃文;贾晓鹏;邓乐

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采用一种简单的高压高温合成方法制备了Bi2Te3块材,研究了其织构演化和各向异性热电性能。HRTEM图像显示了多个微观结构、缺陷和应变。压力调谐导致电导率和热电势的增加,在4GPa下的功率因数相对于0.5GPa下的功率因数提高了10倍。电阻率的异常弱的各向异性归因于沿层表面的粗糙度和应变沿着对载流子迁移率的抑制。
Bi2Te3bulks were synthesized by a simple high pressure and high temperature method to investigate the texture evolution and anisotropic thermoelectric properties. The multiple microstructures, defects and strains were revealed by HRTEM images. Pressure tuning resulted in increasing of electrical conductivity and thermopower, yielding a 10-fold improvement of power factor at 4 GPa, with respect to that at 0.5 GPa. The abnormally weak anisotropy of electrical resistivity was attributed to the inhibition of carrier mobility by roughness and strains along the layer surface.
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