Enhancement of the thermoelectric figure of merit in n-type Cu0.008Bi2Te2.7Se0.3 by using Nb doping

被引：0

作者：

Kyu Hyoung Lee

Byungki Ryu

Hee Jung Park

Kimoon Lee

Jong Wook Roh

Sang Il Kim

Sungwoo Hwang

Soon-Mok Choi

Jong-Young Kim

Jeong Hoon Lee

Jae-Hong Lim

Sung Wng Kim

机构：

[1] Kangwon National University,Department of Nano Applied Engineering

[2] Korea Electrotechnology Research Institute,Advanced Materials Engineering

[3] Daejeon University,Department of Physics

[4] Kunsan National University,Materials R&D Center

[5] Samsung Advanced Institute of Technology,Icheon branch

[6] Korea University of Technology and Education,Department of Electrical Engineering

[7] Korea Institute of Ceramic Engineering and Technology,Electrochemistry Department

[8] Kwangwoon University,Department of Energy Science

[9] Korea Institute of Materials Science,undefined

[10] Sungkyunkwan University,undefined

来源：

Journal of the Korean Physical Society | 2016年 / 68卷

关键词：

Doping; Seebeck coefficient; Effective mass; Thermoelectric; Bi; Te;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Doping with foreign atom has been shown to be an effective way to enhance the dimensionless figure of merit ZT of Bi2Te3-based thermoelectric raw materials. Herein, we report that doping with Nb is effective in enhancing the Seebeck coefficient of n-type Cu0.008Bi2Te2.7Se0.3 polycrystalline bulks. Considering compensation of the Seebeck coefficient due to decrease of the electrical conductivity in Nb-doped compositions, the absolute value of Seebeck coefficient rather increased benefiting from an enhancement of the density of states (DOS) effective mass m* from 1.09m0 (Cu0.008Bi2Te2.7Se0.3) to 1.21m0 − 1.27m0 (Cu0.008Bi2−xNbxTe2.7Se0.3) due to a DOS engineering effect. The values of ZT were 0.84 at 300 K and 0.86 at 320 K for Cu0.008Bi1.99Nb0.01Te2.7Se0.3. This compositional tuning approach highlights the possibility of further enhancement of ZT for n-type Bi2Te3-based compounds by using a combination of nanostructuring technologies to reduce the thermal conductivity.

引用

页码：7 / 11

页数：4

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