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Optimization of thermoelectric properties of n-type Ti, Pb co-doped SnSe

Abstract : n-Type polycrystalline SnSe with Ti, Pb co-doping was synthesized by combining mechanical alloying (MA) with spark plasma sintering (SPS). It is revealed that Ti is an effective cationic dopant to convert SnSe from a p-type to an n-type semiconductor, and the thermoelectric performance of the Ti-doped SnSe is also improved in comparison with the pristine sample due to an enhanced power factor. Furthermore, after further Pb doping, an obviously improved electrical conductivity together with a moderate Seebeck coefficient can be achieved, which results in an improvement of the power factor with a maximum value of 300 mu W m(-1) K-2 at 773 K. Meanwhile, the lattice thermal conductivity is significantly reduced because of the enhanced phonon scattering owing to the mass and strain fluctuations. Therefore, a final ZT value of 0.4 was obtained for composition of Sn0.74Pb0.20Ti0.06Se at 773 K, which is a conservative value for n-type SnSe with cationic dopant prepared by the simple preparation process of MA and SPS.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01631920
Contributor : Laurent Jonchère <>
Submitted on : Thursday, November 9, 2017 - 5:40:27 PM
Last modification on : Thursday, March 5, 2020 - 2:04:36 PM

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Fu Li, Wenting Wang, Xincheng Qiu, Zhuanghao Zheng, Ping Fan, et al.. Optimization of thermoelectric properties of n-type Ti, Pb co-doped SnSe. Inorganic Chemistry Frontiers, Royal Society of Chemistry, 2017, 4 (10), pp.1721-1729. ⟨10.1039/c7qi00436b⟩. ⟨hal-01631920⟩

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