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Thermoelectric Properties of Heavily Doped n-type Pb1−x Y x Te Compounds

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Abstract

Structure, transport and thermoelectric properties of Y-doped PbTe samples are reported. The combined analysis of powder x-ray diffraction patterns and scanning electron microscopy images indicates that the Pb1−x Y x Te samples with x = 0.015, 0.02, 0.04, and 0.06 are single phase with the NaCl-type structure. Hall effect measurements reveal that all the samples are heavily doped n-type thermoelectric materials. The substitution of trivalent Y for bivalent Pb provides additional electrons to the PbTe matrix, leading to an increase in carrier concentration at room temperature ranging from 4.36 × 1019 cm−3 for the sample with x = 0.015 to 2.50 × 1020 cm−3 for the sample with x = 0.06. Both electrical resistivity and the Seebeck coefficient decrease with the increase of Y content. Meanwhile, the total thermal conductivity presents a notable and unsurprising decline with the increase of Y content, which can be ascribed to the mass fluctuation effect. An optimized figure of merit, ZT, of 1.0 is achieved at 831 K for the sample with x = 0.02.

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Acknowledgement

The authors would like to express thanks for the financial support from the Institute of Physics at the Chinese Academy of Science through the startup package.

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Authors and Affiliations

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Limin Ruan, Hangtian Zhu, Huaizhou Zhao & Jingkui Liang

  2. Department of Electronic Information Materials, School of Materials Science and Engineering, Shanghai University, 99 Shangda Road, Baoshan District, Shanghai, 200444, China

    Jun Luo

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  1. Limin Ruan
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  2. Jun Luo
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Correspondence to Jun Luo or Huaizhou Zhao.

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Ruan, L., Luo, J., Zhu, H. et al. Thermoelectric Properties of Heavily Doped n-type Pb1−x Y x Te Compounds. J. Electron. Mater. 44, 3556–3562 (2015). https://doi.org/10.1007/s11664-015-3775-8

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