ZnTe Alloying Effect on Enhanced Thermoelectric Properties of p-Type PbTe

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• 作者：Kyunghan Ahn ; Hocheol Shin ; Jino Im ; Sang Hyun Park ; In Chung
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：9
• 期：4
• 页码：3766-3773
• 全文大小：606K
• ISSN：1944-8252

文摘

We investigate the effect of ZnTe incorporation on PbTe to enhance thermoelectric performance. We report structural, microscopic, and spectroscopic characterizations, ab initio theoretical calculations, and thermoelectric transport properties of Pb<sub>0.985sub>Na<sub>0.015sub>Te–x% ZnTe (x = 0, 1, 2, 4). We find that the solid solubility limit of ZnTe in PbTe is less than 1 mol %. The introduction of 2% ZnTe in p-type Pb<sub>0.985sub>Na<sub>0.015sub>Te reduces the lattice thermal conductivity through the ZnTe precipitates at the microscale. Consequently, a maximum thermoelectric figure of merit (ZT) of 1.73 at 700 K is achieved for the spark plasma-sintered Pb<sub>0.985sub>Na<sub>0.015sub>Te–2% ZnTe, which arises from a decreased lattice thermal conductivity of ∼0.69 W m<sup>–1sup> K<sup>–1sup> at ∼700 K in comparison with Pb<sub>0.985sub>Na<sub>0.015sub>Te.