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Is LiI a Potential Dopant Candidate to Enhance the Thermoelectric Performance in Sb-Free GeTe Systems? A Prelusive Study

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  • Bhuvanesh Srinivasan

    (CNRS-Saint Gobain-NIMS, UMI 3629, Laboratory for Innovative Key Materials and Structures (LINK), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan
    Center for Functional Sensor & Actuator (CFSN) & WPI Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan)

  • David Berthebaud

    (CNRS-Saint Gobain-NIMS, UMI 3629, Laboratory for Innovative Key Materials and Structures (LINK), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan)

  • Takao Mori

    (Center for Functional Sensor & Actuator (CFSN) & WPI Center for Materials Nanoarchitechtonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan
    Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8671, Japan)

Abstract

As a workable substitute for toxic PbTe-based thermoelectrics, GeTe-based materials are emanating as reliable alternatives. To assess the suitability of LiI as a dopant in thermoelectric GeTe, a prelusive study of thermoelectric properties of GeTe 1−x LiI x ( x = 0–0.02) alloys processed by Spark Plasma Sintering (SPS) are presented in this short communication. A maximum thermoelectric figure of merit, zT ~ 1.2, was attained at 773 K for 2 mol% LiI-doped GeTe composition, thanks to the combined benefits of a noted reduction in the thermal conductivity and a marginally improved power factor. The scattering of heat carrying phonons due to the presumable formation of Li-induced “pseudo-vacancies” and nano-precipitates contributed to the conspicuous suppression of lattice thermal conductivity, and consequently boosted the zT of the Sb-free (GeTe) 0.98 (LiI) 0.02 sample when compared to that of pristine GeTe and Sb-rich (GeTe) x (LiSbTe 2 ) 2 compounds that were reported earlier.

Suggested Citation

  • Bhuvanesh Srinivasan & David Berthebaud & Takao Mori, 2020. "Is LiI a Potential Dopant Candidate to Enhance the Thermoelectric Performance in Sb-Free GeTe Systems? A Prelusive Study," Energies, MDPI, vol. 13(3), pages 1-7, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:643-:d:315887
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    1. Kanishka Biswas & Jiaqing He & Ivan D. Blum & Chun-I Wu & Timothy P. Hogan & David N. Seidman & Vinayak P. Dravid & Mercouri G. Kanatzidis, 2012. "High-performance bulk thermoelectrics with all-scale hierarchical architectures," Nature, Nature, vol. 489(7416), pages 414-418, September.
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    Cited by:

    1. Marfoua, Brahim & Lim, Young Soo & Hong, Jisang, 2020. "High thermoelectric performance of two-dimensional α-GeTe bilayer," Energy, Elsevier, vol. 211(C).
    2. Lijun Song & Jing Shi & Anda Pan & Jie Yang & Jun Xie, 2020. "A Dynamic Multi-Swarm Particle Swarm Optimizer for Multi-Objective Optimization of Machining Operations Considering Efficiency and Energy Consumption," Energies, MDPI, vol. 13(10), pages 1-18, May.
    3. Sergey Z. Sapozhnikov & Vladimir Y. Mityakov & Andrey V. Mityakov & Andrey A. Gusakov & Elza R. Zainullina & Mikhail A. Grekov & Vladimir V. Seroshtanov & Alexander Bashkatov & Alexander Y. Babich & A, 2020. "Gradient Heatmetry Advances," Energies, MDPI, vol. 13(23), pages 1-23, November.
    4. Tianbo Lu & Yuqiang Li & Jianxin Zhang & Pingfan Ning & Pingjuan Niu, 2020. "Cooling and Mechanical Performance Analysis of a Trapezoidal Thermoelectric Cooler with Variable Cross-Section," Energies, MDPI, vol. 13(22), pages 1-19, November.

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