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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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
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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

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