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High In-Plane Seebeck Coefficients of Bi–Sb–Te Alloy Thin Films with Growth Texture and Their Field-Controlled Seebeck Coefficients

  • No-Won Park
    No-Won Park
    Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
    More by No-Won Park
  • Won-Yong Lee
    Won-Yong Lee
    Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
    More by Won-Yong Lee
  • Gil-Sung Kim
    Gil-Sung Kim
    Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
    More by Gil-Sung Kim
  • Young-Gui Yoon
    Young-Gui Yoon
    Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
  • Takashi Kikkawa
    Takashi Kikkawa
    Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
  • Eiji Saitoh
    Eiji Saitoh
    Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
    WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
    Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
    More by Eiji Saitoh
  • , and 
  • Sang-Kwon Lee*
    Sang-Kwon Lee
    Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
    WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
    *Email: [email protected]
Cite this: J. Phys. Chem. C 2021, 125, 4, 2373–2381
Publication Date (Web):January 27, 2021
https://doi.org/10.1021/acs.jpcc.0c10926
Copyright © 2021 American Chemical Society

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    Abstract

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    Bismuth antimony telluride (BixSb2–xTe3, BST) is an alloy that has widely been used over the past 5 decades for excellent p-type thermoelectric (TE) materials that operate around 300 K, for example, for electronic refrigeration and generators with other n-type TE materials, including Bi2Te3 alloy materials. However, despite significant progress in bulk materials, there has been less progress and less detailed TE information on Seebeck coefficients in the thin-film form. Here, we report reliable in-plane Seebeck coefficients of p-type Bi0.5Sb1.5Te3 (BST) films and Bi2Te3/Bi0.5Sb1.5Te3 (BT/BST) multilayer films at 300 K using a promising measurement technique with a precisely controlled temperature difference and excellent linearity. Due to the growth texture of the films, a high in-plane Seebeck coefficient of ∼298 μV/K was achieved in 100 nm thick BST films at 300 K, which is an increase of ∼224% compared to that in 200 nm thick BT/BST multilayer films. Moreover, we demonstrate field-controlled Seebeck coefficients of p-BST films by a backside gate configuration in a field-effect transistor. Our results demonstrate the importance of providing a promising measurement technique and reliable information on the in-plane Seebeck coefficients of Bi–Sb–Te alloy thin films for further TE device applications.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpcc.0c10926.

    • Measured Seebeck coefficients for Pt and Cu films; XRD measurement data; Hall-effect measurement data; in-plane power factor calculation; in-plane electrical conductivity calculation by Boltztrap; and comparison of in-plane TE properties with previous literature data (PDF)

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    Cited By

    This article is cited by 3 publications.

    1. Guoxiang Wang, Fanzheng Meng, Yingqi Chen, Andriy Lotnyk, Xiang Shen. Boosting Thermoelectric Performance of Bi 2 Te 3 Material by Microstructure Engineering. Advanced Science 2024, 11 (6) https://doi.org/10.1002/advs.202308056
    2. Yury Shtern, Alexey Sherchenkov, Maxim Shtern, Maxim Rogachev, Dmitry Pepelyaev. Challenges and perspective recent trends of enhancing the efficiency of thermoelectric materials on the basis of PbTe. Materials Today Communications 2023, 37 , 107083. https://doi.org/10.1016/j.mtcomm.2023.107083
    3. Ryosuke Fujiwara, Yohei Takashima, Takaaki Tsuruoka, Muneyuki Naito, Junya Murai, Kensuke Akamatsu. High-performance bulk Bi0.4Sb1.6Te3.0 thermoelectrics prepared from nanocrystal precursor synthesized via chemical precipitation. Journal of Solid State Chemistry 2023, 319 , 123777. https://doi.org/10.1016/j.jssc.2022.123777

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