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Issue 10, 2017
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Optimization of thermoelectric properties of n-type Ti, Pb co-doped SnSe

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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 μW 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.

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

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Publication details

The article was received on 26 Jul 2017, accepted on 22 Aug 2017 and first published on 23 Aug 2017


Article type: Research Article
DOI: 10.1039/C7QI00436B
Citation: Inorg. Chem. Front., 2017,4, 1721-1729
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    Optimization of thermoelectric properties of n-type Ti, Pb co-doped SnSe

    F. Li, W. Wang, X. Qiu, Z. Zheng, P. Fan, J. Luo and B. Li, Inorg. Chem. Front., 2017, 4, 1721
    DOI: 10.1039/C7QI00436B

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