Theoretical investigation of thermoelectric transport properties of cylindrical Bi nanowires

被引:455
作者
Lin, YM [1 ]
Sun, XZ
Dresselhaus, MS
机构
[1] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA
[2] MIT, Dept Phys, Cambridge, MA 02139 USA
关键词
D O I
10.1103/PhysRevB.62.4610
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report here a theoretical model for the transport properties of cylindrical Bi nanowires. Based on the band structure of Bi nanowires and the semiclassical transport model, the thermoelectric figure of merit Z(1D)T is calculated for Bi nanowires with various wire diameters and wire orientations. The results show the trigonal axis is the most favorable wire orientation for thermoelectric applications, and Z(1D)T>1 is predicted for n-type trigonal wires with diameters d(w)<10 nm. The effect of the T-point holes on Z(1D)T is also investigated. It is found that Z(1D)T can be significantly enhanced, especially for p-type Bi nanowires, if the T-point holes are removed or suppressed.
引用
收藏
页码:4610 / 4623
页数:14
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