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Ag/Ni Metallization Bilayer: A Functional Layer for Highly Efficient Polycrystalline SnSe Thermoelectric Modules

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Abstract

The structural and electrical characteristics of Ag/Ni bilayer metallization on polycrystalline thermoelectric SnSe were investigated. Two difficulties with thermoelectric SnSe metallization were identified for Ag and Ni single layers: Sn diffusion into the Ag metallization layer and unexpected cracks in the Ni metallization layer. The proposed Ag/Ni bilayer was prepared by hot-pressing, demonstrating successful metallization on the SnSe surface without interfacial cracks or elemental penetration into the metallization layer. Structural analysis revealed that the Ni layer reacts with SnSe, forming several crystalline phases during metallization that are beneficial for reducing contact resistance. Detailed investigation of the Ni/SnSe interface layer confirms columnar Ni-Sn intermetallic phases [(Ni3Sn and Ni3Sn2) and Ni5.63SnSe2] that suppress Sn diffusion into the Ag layer. Electrical specific-contact resistivity (5.32 × 10−4 Ω cm2) of the Ag/Ni bilayer requires further modification for development of high-efficiency polycrystalline SnSe thermoelectric modules.

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Authors and Affiliations

  1. Advanced Materials and Devices Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea

    Sang Hyun Park, Younghwan Jin & Chung-Yul Yoo

  2. Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea

    Younghwan Jin

  3. School of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea

    Kyunghan Ahn & In Chung

  4. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea

    In Chung

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  1. Sang Hyun Park
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  2. Younghwan Jin
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  3. Kyunghan Ahn
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  4. In Chung
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  5. Chung-Yul Yoo
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Correspondence to In Chung or Chung-Yul Yoo.

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Park, S.H., Jin, Y., Ahn, K. et al. Ag/Ni Metallization Bilayer: A Functional Layer for Highly Efficient Polycrystalline SnSe Thermoelectric Modules. J. Electron. Mater. 46, 848–855 (2017). https://doi.org/10.1007/s11664-016-4972-9

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  • DOI: https://doi.org/10.1007/s11664-016-4972-9

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