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Materials 2018, 11(2), 203; https://doi.org/10.3390/ma11020203

Enhanced Thermoelectric Properties of Polycrystalline SnSe via LaCl3 Doping

1
Shenzhen Key Laboratory of Advanced Thin Films and Applications, College of Physics and Energy, Shenzhen University, Shenzhen 518060, China
2
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
3
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
*
Author to whom correspondence should be addressed.
Received: 12 January 2018 / Revised: 25 January 2018 / Accepted: 26 January 2018 / Published: 28 January 2018
(This article belongs to the Section Energy Materials)
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Abstract

LaCl3 doped polycrystalline SnSe was synthesized by combining mechanical alloying (MA) process with spark plasma sintering (SPS). It is found that the electrical conductivity is enhanced after doping due to the increased carrier concentration and carrier mobility, resulting in optimization of the power factor at 750 K combing with a large Seebeck coefficient over 300 Μvk−1. Meanwhile, all the samples exhibit lower thermal conductivity below 1.0 W/mK in the whole measured temperature. The lattice thermal conductivity for the doped samples was reduced, which effectively suppressed the increscent of the total thermal conductivity because of the improved electrical conductivity. As a result, a ZT value of 0.55 has been achieved for the composition of SnSe-1.0 wt % LaCl3 at 750 K, which is nearly four times higher than the undoped one and reveals that rare earth element is an effective dopant for optimization of the thermoelectric properties of SnSe. View Full-Text
Keywords: thermoelectric material; SnSe; electrical conductivity; thermal conductivity thermoelectric material; SnSe; electrical conductivity; thermal conductivity
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Li, F.; Wang, W.; Ge, Z.-H.; Zheng, Z.; Luo, J.; Fan, P.; Li, B. Enhanced Thermoelectric Properties of Polycrystalline SnSe via LaCl3 Doping. Materials 2018, 11, 203.

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