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Enhanced thermoelectric performance of Bi0.5Sb1.5Te3 composites through potential barrier scattering at heterogeneous interfaces SCIE SCOPUS

Title
Enhanced thermoelectric performance of Bi0.5Sb1.5Te3 composites through potential barrier scattering at heterogeneous interfaces
Authors
Dharmaiah, PeyalaLee, Kap-HoSong, Sung HoKim, Hyoung SeopHong, Soon-Jik
Date Issued
2021-01
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
The inclusion of secondary phase in a matrix has been proven effective in diverse regimes of thermoelectric (TE) material research intended to attain high thermoelectric performance. Herein, we show that the introduction of semiconducting Zn4Sb3 alloys into a Bi0.5Sb1.5Te3 matrix to form ZnTe nanophase in situ causes enhanced electrical conductivity and reduced thermal conductivity. This is due to increase in the carrier concentration and intensified phonon scattering at interface potentials. These simultaneously increased the power factor by 17 % and achieved a remarkable reduction (25 %) of lattice thermal conductivity at 350 K for BST/2 wt% Zn(4)Sb(3 )composites. As a result, the largest value of ZT (1.35) was obtained at 350 K, which is 26 % higher than that of the Bi0.5Sb1.5Te3 matrix at the same temperature. Moreover, the maximum conversion efficiency was about 8.74 % at Delta T = 200 K for BST/2 wt% Zn4Sb3 composites, which is 25 % higher than that of a bare BST sample.
Keywords
Bismuth alloys; Carrier concentration; II-VI semiconductors; Semiconducting bismuth compounds; Semiconducting tellurium compounds; Semiconducting zinc compounds; Thermal conductivity of solids; Thermoelectricity; Wide band gap semiconductors; Zinc alloys; Electrical conductivity; Heterogeneous interfaces; Interface potentials; Lattice thermal conductivity; Potential barriers; Secondary phase; Thermoelectric material; Thermoelectric performance; Semiconducting antimony compounds
URI
https://oasis.postech.ac.kr/handle/2014.oak/104804
DOI
10.1016/j.materresbull.2020.111023
ISSN
0025-5408
Article Type
Article
Citation
MATERIALS RESEARCH BULLETIN, vol. 133, 2021-01
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김형섭KIM, HYOUNG SEOP
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