Thermoelectric Performance of Single-Phase Tellurium-Reduced Quaternary (PbTe)(0.55)(PbS)(0.1)(PbSe)(0.35)

SHAABANI, Laaya, BLAKE, Graeme R, MANETTAS, Andrew, KESHAVARZI, Shokat and AMINORROAYA YAMINI, Sima (2019). Thermoelectric Performance of Single-Phase Tellurium-Reduced Quaternary (PbTe)(0.55)(PbS)(0.1)(PbSe)(0.35). ACS Omega, 4 (5), 9235-9240.

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Abstract

Lead chalcogenide quaternary systems have been shown to provide high thermoelectric (TE) efficiency superior to those of binary and ternary lead chalcogenides, arising from both altered electronic band structures and a reduction in lattice thermal conductivity. Here, we have synthesized single-phase samples of the quaternary compound (PbTe)0.55(PbS)0.1(PbSe)0.35 doped with Na and characterized their TE properties. We show that the dopant solubility is limited to 1 at. %. A very low lattice thermal conductivity of ∼0.6 W m–1 K–1 at 850 K is achieved at all dopant concentrations because of phonon scattering from point defects associated with solute atoms with high contrast atomic mass. As a result, a high TE figure of merit of approximately 1.5 is achieved at 823 K in heavily doped samples. Moreover, the figure of merit is greater than 1 over a wide temperature range above 675 K.

Item Type:	Article
Identification Number:	https://doi.org/10.1021/acsomega.9b00686
Page Range:	9235-9240
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	01 Jul 2019 12:28
Last Modified:	18 Mar 2021 05:06
URI:	https://shura.shu.ac.uk/id/eprint/24776

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