High thermoelectric performance in sintered octahedron-shaped Sn(CdIn)xTe1+2x microcrystals

Moshwan, Raza and Shi, Xiao-Lei and Liu, Wei-Di and Yang, Lei and Wang, Yuan and Hong, Min and Auchterlonie, Graeme and Zou, Jin and Chen, Zhi-Gang (2018) High thermoelectric performance in sintered octahedron-shaped Sn(CdIn)xTe1+2x microcrystals. ACS Applied Materials and Interfaces, 10 (45). pp. 38944-38952. ISSN 1944-8244

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.


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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: 21 Feb 2019 04:25
Last Modified: 04 Mar 2019 04:24
Uncontrolled Keywords: band engineering; In/Cd codoping; nanostructuring; SnTe; thermoelectric
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/acsami.8b14233
URI: http://eprints.usq.edu.au/id/eprint/35494

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