NDLI: Superior thermoelectric performance in PbTe–PbS pseudo-binary: extremely low thermal conductivity and modulated carrier concentration

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhao, Li-Dong Pei, Yanling Li, Jing-Feng Tan, Qing Huang, Li Kanatzidis, Mercouri G. Li, Wei He, Jiaqing Zhu, Yimei Wu, Lijun Wu, Di Tong, Xiao
Copyright Year	2015
Abstract	Lead chalcogenides are dominant thermoelectric materials in the medium-temperature range due to their highly favorable electronic band structures and low thermal conductivities. An important system is the PbTe–PbS pseudo-binary, and its low thermal conductivity originates largely from the coexistence of both alloying and nanostructuring through phase-separation. To better understand the competition between the alloying and phase separation and its pronounced effects on the thermoelectric performance in PbTe–PbS, we systematically studied, via transmission electron microscopy (TEM) observations and theoretical calculations, the samples of Spark Plasma Sintered (SPSed) 3 at% Na-doped (PbTe)1−x(PbS)x with x = 10%, 15%, 20%, 25%, 30% and 35%. The highest figure of merit, viz., ZT ∼ 2.3 was obtained at 923 K, when the PbS phase-fraction, x, was 20%, which corresponds to the lowest lattice thermal conductivity of the series. The consistently lower lattice thermal conductivities in the SPSed samples as compared with the corresponding ingots originates from the mesostructured nature of the former, which contributes significantly to their superior ZT. We also studied the onset of carrier concentration modulation at ∼600 K, which leads to the observed saturation of electrical transport properties due to the diffusion and re-dissolution of excessive Na into the PbTe–PbS matrix. This carrier concentration modulation is equally crucial to achieve very high power factors (up to 26.5 μW cm−1 K−2 at 623 K) and outstanding thermoelectric performances in SPSed PbTe–PbS binaries.
Starting Page	2056
Ending Page	2068
Page Count	13
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	8
Issue Number	7
Journal	Energy & Environmental Science
DOI	10.1039/c5ee01147g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Thermoelectric materials Thermal conductivity Transmission electron microscopy Crystal structure Diffusion Composite material
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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