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Phase and Thermoelectric Properties of SnTe with (Ge, Mn) Co-doping

Abstract

Lead-free SnTe compound shows good electrical property but also high thermal conductivity, resulting in low figure of merit ZT. We demonstrate a significant enhancement of the thermoelectric properties of SnTe with (Ge, Mn) co-doping. The (Ge, Mn) co-doped samples (Sn0.8Ge0.2)1-xMnxTe with x = 0, 0.03, 0.06, 0.09, 0.12, 0.15, 0.18 and 0.2 were prepared for this investigation. The substitution of Ge for Sn in SnTe promotes the solubility of Mn in SnTe-based phase up to 20 at.%, which further enlarges the band gap and gives rise to enhanced valence band convergence as compared with Mn doping, leading to notably increased Seebeck coefficient and power factor. All alloys keep p-type conduction and hole carrier concentration increases with increasing Mn content. The solute Ge and Mn atoms as well as the second phase of Ge in SnTe-based system enhance phonon scattering and thus reduce the thermal conductivity. The synergistic role that Ge and Mn play in regulating the electron and phonon transport of SnTe yields a maximum figure of merit ZT of 1.22 at 873 K in the sample (Sn0.8Ge0.2)0.85Mn0.15Te.

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Publication details

The article was received on 21 Jul 2017, accepted on 30 Sep 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP04931E
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Phase and Thermoelectric Properties of SnTe with (Ge, Mn) Co-doping

    J.Q. Li, S. Huang, Z. P. Chen, Y. Li, S.H. Song, F.S. Liu and W.Q. Ao, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP04931E

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