Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening
Article
Article Title | Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening |
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ERA Journal ID | 210414 |
Article Category | Article |
Authors | Shi, Xiaolei (Author), Chen, Zhi-Gang (Author), Liu, Weidi (Author), Yang, Lei (Author), Hong, Min (Author), Moshwan, Raza (Author), Huang, Liqing (Author) and Zou, Jin (Author) |
Journal Title | Energy Storage Materials |
Journal Citation | 10, pp. 130-138 |
Number of Pages | 9 |
Year | 2018 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 2405-8289 |
2405-8297 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.ensm.2017.08.014 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S2405829717303501?via%3Dihub |
Abstract | In this study, we report a record peak Figure of Merit (ZT) of 1.36 +/- 0.12 in polycrystalline Sn0.98Se macro-sized plates, fabricated via a facile solvothermal method. The obtained exceptional thermoelectric performance comes from their high power factor of 6.95 mu Wcm(-1)K(-2) and ultra-low thermal conductivity of 0.42 Wm(-1)K(-1) at 823 K. Through our Hall measurements, we found the high carrier concentration of 1.5 x 1019 cm(-3) derived from the self-doping, which contributes to a high electrical conductivity and a moderate Seebeck coefficient. Moreover, detailed structural characterizations reveal a strong preferred orientation in our sintered Sn0.98Se pellets. The phonon scattering sources such as grain boundaries, synergistically coupled with the anharmonicity boding of Sn0.98Se crystals with a high density of 98.5%, result in an intrinsic ultra-low thermal conductivity. This study provides a new perspective to achieve high thermoelectric performance in polycrystalline SnSe materials. |
Keywords | thermoelectric materials; tin selenide; solvothermal synthesis; self-doping; anisotropy-strengthening |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Public Notes | Online from 5 September 2017. Restricted access to published version in accordance with the copyright policy of the publisher. |
Byline Affiliations | University of Queensland |
University of Southern Queensland | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q497q/achieving-high-figure-of-merit-in-p-type-polycrystalline-sn0-98se-via-self-doping-and-anisotropy-strengthening
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