Rare-Earth Nd Inducing Record-High Thermoelectric Performance of (GeTe)85(AgSbTe2)15

Lyu, Wan Yu and Hong, Min ORCID: https://orcid.org/0000-0002-6469-9194 and Liu, Wei Di and Li, Meng and Sun, Qiang and Xu, Sheng Duo and Zou, Jin and Chen, Zhi-Gang ORCID: https://orcid.org/0000-0002-9309-7993 (2021) Rare-Earth Nd Inducing Record-High Thermoelectric Performance of (GeTe)85(AgSbTe2)15. Energy Material Advances, 2021:2414286. pp. 1-8. ISSN 2692-7640

[img] Text (Published Version)
2414286.pdf
Available under License Creative Commons Attribution 4.0.

Download (2MB)

Abstract

As a promising midtemperature thermoelectric material with both higher thermoelectric performance and mechanical property, Tellurium Antimony Germanium Silver (TAGS-x), written as (GeTe)x(AgSbTe2)1-x, especially (GeTe)0.85(AgSbTe2)0.15 (TAGS-85), has attracted wide attention. Herein, we innovatively use Nd doping to synergistically decrease the carrier concentration to the optimal level leading to enhanced dimensionless figure of merit, zT. Our density-functional theory calculation results indicate that Nd-doping reduced carrier concentration should be attributed to the enlargement of band gap. The optimized carrier concentration results in an ultrahigh power factor of ~32 μW cm-1 K-2 at 727 K in Ge0.74Ag0.13Sb0.11Nd0.02Te. Simultaneously, the lattice thermal conductivity of Ge0.74Ag0.13Sb0.11Nd0.02Te retained as low as ~0.5 at 727 K. Ultimately, a record-high zT of 1.65 at 727 K is observed in the Ge0.74Ag0.13Sb0.11Nd0.02Te. This study indicates rare-earth Nd doping is effective in boosting the thermoelectric performance of TAGS-85 and approached a record-high level via synergistic effect.


Statistics for USQ ePrint 43658
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 17 Sep 2021 05:30
Last Modified: 04 Nov 2021 01:33
Uncontrolled Keywords: Tellurium Antimony Germanium Silver (TAGS-x), (GeTe)x(AgSbTe2)1-x, midtemperature thermoelectric materials, thermoelectric performance, mechanical properties
Fields of Research (2008): 02 Physical Sciences > 0204 Condensed Matter Physics > 020499 Condensed Matter Physics not elsewhere classified
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5104 Condensed matter physics > 510404 Electronic and magnetic properties of condensed matter; superconductivity
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 17 ENERGY > 1708 Renewable energy > 170805 Solar-thermal energy
Funding Details:
Identification Number or DOI: doi:10.34133/2021/2414286
URI: http://eprints.usq.edu.au/id/eprint/43658

Actions (login required)

View Item Archive Repository Staff Only