Enhanced thermoelectric properties of hydrothermally synthesized n-type Se&Lu-codoped Bi2Te3

Xiaolei Shi,Shijia Gu,Xin Ai,Wan Jiang,Xiaofang Lu,Qihao Zhang,Lianjun Wang,Li Su

doi:10.1007/s40145-020-0382-9

Xiaolei Shi, Shijia Gu + Show 6 more

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https://doi.org/10.1007/s40145-020-0382-9

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Abstract

N-type Se&Lu-codoped Bi2Te3 nanopowders were prepared by hydrothermal method and sintered by spark plasma sintering technology to form dense samples. By further doping Se element into Lu-doped Bi2Te3 samples, the thickness of the nanosheets has the tendency to become thinner. The electrical conductivity of Lu0.1Bi1.9Te3−xSex material is reduced with the increasing Se content due to the reduced carrier concentration, while the Seeback coefficient values are enhanced. The lattice thermal conductivity of the Lu0.1Bi1.9Te3−xSex is greatly reduced due to the introduced point defects and atomic mass fluctuation. Finally, the Lu0.1Bi1.9Te2.7Se0.3 sample obtained a maximum ZT value of 0.85 at 420 K. This study provides a low-cost and simple low-temperature method to mass production of Se&Lu-codoped Bi2Te3 with high thermoelectric performance for practical applications.

Highlights

IntroductionWith the rapid development of society, the gradual consumption of the earth’s resources and the energy
With the rapid development of society, the gradual consumption of the earth’s resources and the energyJ Adv Ceram 2020, 9(4): 424–431 most widely used thermoelectric material at room temperature, and have been often used for power generation in precision instruments
The main diffraction peaks of the Lu0.1Bi1.9Te3–xSex (x = 0.2, 0.3, 0.4) samples are all consistent with the standard JCPDS card (PDF#50-0953) of Bi2SeTe2, and no visible impurity phases are observed from XRD

Summary

Introduction

With the rapid development of society, the gradual consumption of the earth’s resources and the energy. J Adv Ceram 2020, 9(4): 424–431 most widely used thermoelectric material at room temperature, and have been often used for power generation in precision instruments. Thermoelectric materials are classified into n-type and p-type according to different conductivity mechanisms. N-type is conductive by electrons, and p-type is conductive by holes. P-type Bi2Te3 has been greatly developed [3,4]. The performance of n-type Bi2Te3 is still at a low level [5,6]. A thermoelectric device is composed of n-type and p-type materials, so it is very necessary to further study the n-type Bi2Te3 alloys

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