High thermoelectric performance in sintered octahedron-shaped Sn(CdIn)xTe1+2x microcrystals
Article
Article Title | High thermoelectric performance in sintered octahedron-shaped Sn(CdIn)xTe1+2x microcrystals |
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ERA Journal ID | 40638 |
Article Category | Article |
Authors | Moshwan, Raza (Author), Shi, Xiao-Lei (Author), Liu, Wei-Di (Author), Yang, Lei (Author), Wang, Yuan (Author), Hong, Min (Author), Auchterlonie, Graeme (Author), Zou, Jin (Author) and Chen, Zhi-Gang (Author) |
Journal Title | ACS Applied Materials and Interfaces |
Journal Citation | 10 (45), pp. 38944-38952 |
Number of Pages | 9 |
Year | 2018 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 1944-8244 |
1944-8252 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acsami.8b14233 |
Web Address (URL) | https://pubs.acs.org/doi/10.1021/acsami.8b14233 |
Abstract | In this study, we fabricate In/Cd codoped octahedron-shape Sn(CdIn)xTe1+2x microcrystals with a promising thermoelectric performance by using a facile solvothermal method. The high hole–carrier concentration of pristine SnTe is significantly reduced through effective In/Cd codoping, which increases the Seebeck coefficient in a wide temperature range. Moreover, codoped In/Cd not only modifies the band structure by creating the resonance energy level at the valence band and converging light hole and heavy hole valence bands of SnTe but also provides In/Cd-rich nanoprecipitates in the matrix, leading to a high power factor of ∼26.76 μW cm–1 K–2 at 773 K in the sintered SnIn0.03Cd0.03Te1.06. Compared with the bulk counterparts, a much lower lattice thermal conductivity is achieved over a wide temperature range because of strong phonon scattering by point defects, nanoprecipitates, lattice distortion, and grain boundaries in the sintered SnInxCdxTe1+2x (x = 3 and 4%) samples. Consequently, a high ZT of ∼1.12 is obtained at 773 K in the p-type SnIn0.03Cd0.03Te1.06, suggesting that nanoprecipitate-included Cd/In codoped octahedron-shaped Sn(CdIn)xTe1+2x microcrystals are a convincing candidate for medium-temperature thermoelectric applications. |
Keywords | band engineering; In/Cd codoping; nanostructuring; SnTe; thermoelectric |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Queensland |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q5068/high-thermoelectric-performance-in-sintered-octahedron-shaped-sn-cdin-xte1-2x-microcrystals
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