Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening

Shi, Xiaolei and Chen, Zhi-Gang and Liu, Weidi and Yang, Lei and Hong, Min and Moshwan, Raza and Huang, Liqing and Zou, Jin (2018) Achieving high Figure of Merit in p-type polycrystalline Sn0.98Se via self-doping and anisotropy-strengthening. Energy Storage Materials, 10. pp. 130-138. ISSN 2405-8297


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Online from 5 September 2017. Restricted access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 28 Mar 2018 01:19
Last Modified: 15 May 2018 01:04
Uncontrolled Keywords: thermoelectric materials; tin selenide; solvothermal synthesis; self-doping; anisotropy-strengthening
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Funding Details:
Identification Number or DOI: 10.1016/j.ensm.2017.08.014

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