Enhanced thermoelectric efficiency in nanocrystalline bismuth telluride nanotubes

被引：6

作者：

Kim, DukSoo ^{[1
]}

Du, Renzhong ^{[2
]}

Yu, Shih-Ying ^{[3
]}

Yin, Yuewei ^{[4
]}

Dong, Sining ^{[4
]}

Li, Qi ^{[5
]}

Mohney, Suzanne E. ^{[6
]}

Li, Xiaoguang ^{[4
]}

Tadigadapa, Srinivas ^{[7
]}

机构：

[1] Samsung Elect, 129 Samsung Ro, Suwon 443742, Gyeonggi Do, South Korea

[2] Lam Res, 4650 Cushing Pkwy, Fremont, CA 94538 USA

[3] Intel Corp, 2111 25th Ave, Hillsboro, OR 97124 USA

[4] Univ Sci & Technol China, Dept Phys, Hefei Natl Lab Phys Sci Microscale, Hefei, Peoples R China

[5] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[6] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[7] Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA

来源：

NANOTECHNOLOGY | 2020年 / 31卷 / 36期

基金：

美国国家科学基金会;

关键词：

bismuth telluride; thermoelectric; nanotube; 3-omega; thermal conductivity; micromachined testbench; ZT; THERMAL-CONDUCTIVITY; BI2TE3; NANOWIRES; PERFORMANCE; SCATTERING; TRANSPORT; ALLOYS; POWER; FIGURE; FILMS; HEAT;

D O I：

10.1088/1361-6528/ab97d2

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report on the thermal and thermoelectric properties of individual nanocrystalline Bi(2)Te(3)nanotubes synthesized by the solution phase method using 3 omega method and a microfabricated testbench. Measurements show that the nanotubes offer improvedZTcompared to bulk Bi(2)Te(3)near room temperature due to an enhanced Seebeck coefficient and suppressed thermal conductivity. This improvement inZToriginates from the nanocrystalline nature and low dimensionality of the nanotubes. Domain boundary filtering of low-energy electrons provides an enhanced Seebeck coefficient. The scattering of phonons at the surface of the nanotube leads to suppressed thermal conductivity. These have been theoretically analyzed using the Boltzmann equation based on the relaxation time approximation and Landauer approach. This work clearly demonstrates the possibility of achieving enhancement in thermoelectric efficiency by combining nanocrystalline and low-dimensional systems.

引用

页数：10

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