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Article

Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator

1
Department of Applied Physics, Integrated Education Institute for Frontier Science and Technology (BK21 Four) and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Korea
2
Energy Materials Laboratory, Toyota Technological Institute, Nagoya 468-8511, Japan
3
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
*
Authors to whom correspondence should be addressed.
The authors equally contributed on this work.
Academic Editor: S. Joseph Poon
Materials 2021, 14(8), 1920; https://doi.org/10.3390/ma14081920
Received: 1 March 2021 / Revised: 5 April 2021 / Accepted: 7 April 2021 / Published: 12 April 2021
(This article belongs to the Special Issue Novel Thermoelectric Materials and Device Design Concepts)
We investigated the thermoelectric properties of the Pb0.75Sn0.25Se and Pb0.79Sn0.25Se1−xClx (x = 0.0, 0.2, 0.3, 0.5, 1.0, 2.0 mol.%) compounds, synthesized by hot-press sintering. The electrical transport properties showed that low concentration doping of Cl (below 0.3 mol.%) in the Pb-excess (Pb,Sn)Se samples increased the carrier concentration and the Hall mobility by the increase of carriers’ mean free path. The effective mass of the carrier was also enhanced from the measurements of the Seebeck coefficient. The enhanced effective masses of the carrier by the Cl-doping can be understood by the enhanced electron-phonon interaction, caused by the crystalline mirror symmetry breaking. The significantly decreased lattice thermal conductivities showed that the crystalline mirror symmetry breaking decreased the lattice thermal conductivity of the Pb-excess (Pb,Sn)Se. By the Cl-doping and the Pb-excess’s synergistic effect, which can suppress the bipolar effect, the zT values of x = 0.2 and 0.3 mol.% reached 0.8 at 773 K. Therefore, we suggest that Pb-excess and the crystalline mirror symmetry breaking by Cl-doping are effective for high thermoelectric performance in the (Pb,Sn)Se. View Full-Text
Keywords: (Pb,Sn)Se; crystalline mirror symmetry breaking; Cl-doping; Pb-excess; thermoelectric (Pb,Sn)Se; crystalline mirror symmetry breaking; Cl-doping; Pb-excess; thermoelectric
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MDPI and ACS Style

Kim, J.H.; Kim, G.; Byeon, S.; Jin, H.; Rhyee, J.-S. Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator. Materials 2021, 14, 1920. https://doi.org/10.3390/ma14081920

AMA Style

Kim JH, Kim G, Byeon S, Jin H, Rhyee J-S. Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator. Materials. 2021; 14(8):1920. https://doi.org/10.3390/ma14081920

Chicago/Turabian Style

Kim, Jin H., Gareoung Kim, Seokyeong Byeon, Hyungyu Jin, and Jong-Soo Rhyee. 2021. "Synergistic Enhancement of Thermoelectric Performances by Cl-Doping and Pb-Excess in (Pb,Sn)Se Topological Crystal Insulator" Materials 14, no. 8: 1920. https://doi.org/10.3390/ma14081920

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