Rashba effect maximizes thermoelectric performance of GeTe derivatives
Article
Article Title | Rashba effect maximizes thermoelectric performance of GeTe derivatives |
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ERA Journal ID | 213083 |
Article Category | Article |
Authors | Hong, Min (Author), Lyv, Wanyu (Author), Li, Meng (Author), Xu, Shengduo (Author), Sun, Qiang (Author), Zou, Jin (Author) and Chen, Zhi-Gang (Author) |
Journal Title | Joule |
Journal Citation | 4 (9), pp. 2030-2043 |
Number of Pages | 14 |
Year | 2020 |
Publisher | Cell Press |
Place of Publication | United States |
ISSN | 2542-4351 |
2542-4785 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.joule.2020.07.021 |
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. |
Keywords | thermoelectric energy conversion; GeTe-based alloys; Rashba spin-dependent band splitting; spin-orbital coupling; band structure engineering; stacking faults |
ANZSRC Field of Research 2020 | 401605. Functional materials |
510404. Electronic and magnetic properties of condensed matter; superconductivity | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Future Materials |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q6104/rashba-effect-maximizes-thermoelectric-performance-of-gete-derivatives
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