Super large Sn1−xSe single crystals with excellent thermoelectric performance

Jin, Min and Shi, Xiao-Lei ORCID: https://orcid.org/0000-0003-0905-2547 and Feng, Tianli and Liu, Weidi and Feng, Haifeng and Pantelides, Sokrates T. and Jiang, Jun and Chen, Yunxia and Du, Yi and Zou, Jin and Chen, Zhi-Gang (2019) Super large Sn1−xSe single crystals with excellent thermoelectric performance. ACS Applied Materials and Interfaces, 11. pp. 8051-8059. ISSN 1944-8244


Abstract

SnSe single crystals have drawn extensive attention for their ultralow thermal conductivity and outstanding thermoelectric performance. Here, we report super large Sn1−xSe single crystals with excellent thermoelectric properties, fabricated via an advanced horizontal Bridgman technique with great yield and high reproducibility. The obtained single crystals have a super large size of ∼70 × 50 × 15 mm with a considerable weight of 148 g, which leads to a record-high mass density of >6.1 g cm−3. Extensive chemical characterization demonstrates that ∼0.3% Sn vacancies are present, which results in a large concentration of holes, ∼1.2 × 1019 cm−3, and an enhanced power factor of ∼6.1 μW cm−1 K−2 at 793 K. Simultaneously, the Sn-vacancy-induced lattice distortions result in a low thermal conductivity of ∼0.39 W m−1 K−1 at 793 K, leading to a competitive ZT of ∼1.24. This work demonstrates that large-size off-stoichiometric SnSe single crystals hold promise to achieve high thermoelectric performance.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2019 American Chemical Society.
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: 05 Mar 2020 04:12
Last Modified: 13 Mar 2020 06:26
Uncontrolled Keywords: thermoelectric, tin selenide, single crystal, characterizations, first-principles calculations
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Identification Number or DOI: 10.1021/acsami.8b21699
URI: http://eprints.usq.edu.au/id/eprint/37927

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