Giant improvement of thermoelectric power factor of Bi2Te3 under pressure

被引：150

作者：

Ovsyannikov, Sergey V. ^{[1
]}

Shchennikov, Vladimir V. ^{[1
]}

Vorontsov, Grigoriy V. ^{[1
]}

Manakov, Andrey Y. ^{[2
]}

Likhacheva, Anna Y. ^{[3
]}

Kulbachinski, Vladimir A. ^{[4
]}

机构：

[1] Russian Acad Sci, Urals Div, Inst Met Phys, High Pressure Grp, Ekaterinburg 620041, Russia

[2] Russian Acad Sci, AV Nikolaev Inst Inorgan Chem, Siberian Div, Novosibirsk 630090, Russia

[3] Russian Acad Sci, Inst Mineral & Petrog, Siberian Div, Novosibirsk 630090, Russia

[4] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 104卷 / 05期

关键词：

D O I：

10.1063/1.2973201

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The pressure (P) dependencies of both the thermopower (Seebeck effect) S and the electrical resistance (R) for p-type single crystals of Bi2Te3 and indium-doped bismuth telluride (InxBi2-xTe3, 0.04 <= x <= 0.10) are reported on a pressure range of 0-8.5 GPa. The thermoelectric power factor (efficiency) (alpha = S-2/R) exhibits two maxima: the first one near similar to 1 GPa and the second near similar to 2.5-4.5 GPa. These features evidence a giant increase in the power factor by a factor of similar to 10. Possible values of the dimensionless figure of merit under pressure are also estimated. The maxima are explained in terms of pressure-driven changes in an electron structure. The second feature may be also addressed to an intermediate high-pressure phase detected in x-ray diffraction studies. (C) 2008 American Institute of Physics.

引用

页数：5

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