Polycrystalline SnSe with extraordinary thermoelectric property via nanoporous design

Shi, Xiaolei and Wu, Angyin and Liu, Weidi and Moshwan, Raza and Wang, Yuan and Chen, Zhi-Gang and Zou, Jin (2018) Polycrystalline SnSe with extraordinary thermoelectric property via nanoporous design. ACS Nano, 12 (11). pp. 11417-11425. ISSN 1936-0851


Nanoporous materials possess low thermal conductivities derived from effective phonon scatterings at grain boundaries and interfaces. Thus nanoporous thermoelectric materials have full potential to improve their thermoelectric performance. Here we report a high ZT of 1.7 ± 0.2 at 823 K in p-type nanoporous polycrystalline SnSe fabricated via a facile solvothermal route. We successfully induce indium selenides (InSey) nanoprecipitates in the as-synthesized SnSe matrix of single-crystal microplates, and the nanopores are achieved via the decompositions of these nanoprecipitates during the sintering process. Through detailed structural and chemical characterizations, it is found that the extralow thermal conductivity of 0.24 W m–1 K–1 caused by the effective phonon blocking and scattering at induced nanopores, interfaces, and grain boundaries and the high power factor of 5.06 μW cm–1 K–2 are derived from a well-tuned hole carrier concentration of 1.34 × 1019 cm–3 via inducing high Sn vacancies by self-doping, contributing to high ZTs. This study fills the gap of achieving nanoporous SnSe and provides an avenue in achieving high-performance thermoelectric properties of materials.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 20 Feb 2019 05:03
Last Modified: 06 Mar 2019 04:39
Uncontrolled Keywords: nanopore; solvothermal; stannous selenide; thermal conductivity; thermoelectrics
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
E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Funding Details:
Identification Number or DOI: 10.1021/acsnano.8b06387
URI: http://eprints.usq.edu.au/id/eprint/35500

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