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：
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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.
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页码：7 / 11
页数：4
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