Hong, Min and Lyv, Wanyu and Li, Meng and Xu, Shengduo and Sun, Qiang and Zou, Jin and Chen, Zhi-Gang 
ORCID: https://orcid.org/0000-0002-9309-7993
(2020)
Rashba effect maximizes thermoelectric performance of GeTe derivatives.
Joule, 4 (9).
pp. 2030-2043.
ISSN 2542-4351
Abstract
Advances in thermoelectrics are motivated by the innovation of thermoelectric theories. The Rashba effect, spin-dependent band splitting, paves a new path to enhance thermoelectric performance. Herein, we investigate the Rashba effect in GeTe, in which the rhombohedral distortion provides a unique handle to examine the mechanism of the Rashba effect for tuning thermoelectric properties. Fundamentally, we discover that the Rashba effect originates from the specific atomic site displacement. Experimentally, Sn-doped GeTe has a strong Rashba effect and yields an ultra-high power factor, meanwhile additional Sb alloying effectively tunes the carrier concentration. Moreover, microstructure characterizations reveal that the co-existence of grain boundaries, nanoprecipitates, and stacking faults significantly reinforces phonon scatterings and leads to an ultra-low lattice thermal conductivity. Finally, a high figure of merit is achieved in Ge1−x−ySnxSbyTe. The demonstrated benchmark figure of merit originated from the Rashba effect can provide a promising arena for enhancing thermoelectric performance in wide materials.
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| Item Type: | Article (Commonwealth Reporting Category C) |
|---|---|
| Refereed: | Yes |
| Item Status: | Live Archive |
| Additional Information: | Permanent restricted access to Published version in accordance with the copyright policy of the publisher. |
| 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: | 21 Jan 2021 03:30 |
| Last Modified: | 29 Jan 2021 04:34 |
| Uncontrolled Keywords: | thermoelectric energy conversion; GeTe-based alloys; Rashba spin-dependent band splitting; spin-orbital coupling; band structure engineering; stacking faults |
| Fields of Research (2008): | 02 Physical Sciences > 0204 Condensed Matter Physics > 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials |
| Fields of Research (2020): | 40 ENGINEERING > 4016 Materials engineering > 401605 Functional materials 51 PHYSICAL SCIENCES > 5104 Condensed matter physics > 510404 Electronic and magnetic properties of condensed matter; superconductivity |
| Funding Details: | |
| Identification Number or DOI: | https://doi.org/10.1016/j.joule.2020.07.021 |
| URI: | http://eprints.usq.edu.au/id/eprint/40550 |
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