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Synergistic Manipulation of Interdependent Thermoelectric Parameters in SnTe–AgBiTe2Alloys by Mn Doping

Authors :
Guo, Zhe
Wu, Gang
Tan, Xiaojian
Wang, Ruoyu
Yan, Zipeng
Zhang, Qiang
Song, Kun
Sun, Peng
Hu, Haoyang
Cui, Chen
Liu, Guo-Qiang
Jiang, Jun
Source :
ACS Applied Materials & Interfaces; June 2022, Vol. 14 Issue: 25 p29032-29038, 7p
Publication Year :
2022

Abstract

In the mid-temperature region, SnTe is a promising substitute for PbTe, whereas the thermoelectric (TE) property of pristine SnTe is severely limited by the good thermal conductivity and inferior Seebeck coefficient. In this research, we synergistically manipulate the interdependent TE parameters of SnTe–AgBiTe2alloys by Mn doping to increase the ZTvalue. The AgBiTe2alloying is found to greatly reduce the electrical conductivity and electronic contribution for thermal transport by reducing the carrier mobility, while Mn doping obviously improves the Seebeck coefficient by effectively decreasing the valence band offset. The lowest κlof Mn-doped SnTe–AgBiTe2alloys is 0.49 W m–1K–1at 823 K since the various defects strengthen the phonon scattering. Collectively, these manipulations yield a peak ZTvalue of 1.40 at 823 K and an average ZTvalue of 0.73 (300–823 K) in the Mn-doped SnTe–AgBiTe2alloys. This research suggests that Mn doping is a valid scheme to constantly improve the thermoelectric property of SnTe–AgBiTe2alloys in a wide temperature range.

Details

Language :
English
ISSN :
19448244
Volume :
14
Issue :
25
Database :
Supplemental Index
Journal :
ACS Applied Materials & Interfaces
Publication Type :
Periodical
Accession number :
ejs59950704
Full Text :
https://doi.org/10.1021/acsami.2c07548