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Multiple Phase Transition Induced Enhancement of Low-Temperature Thermoelectric Power in Ductile AgCuS-Based Thin Films

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    Functional Inorganic Materials and Devices

    Multiple Phase Transition Induced Enhancement of Low-Temperature Thermoelectric Power in Ductile AgCuS-Based Thin Films
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    • Hyein Hwang
      Hyein Hwang
      Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Gyeongsangbuk-do, Republic of Korea
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    • Seung Hwae Heo
      Seung Hwae Heo
      Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Gyeongsangbuk-do, Republic of Korea
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    • Jae Hong Jang
      Jae Hong Jang
      Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
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    • Cholong Choi
      Cholong Choi
      Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
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    • Gang Hee Gu
      Gang Hee Gu
      Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
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    • Chaenyung Cha
      Chaenyung Cha
      Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
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      Orcidhttps://orcid.org/0000-0002-3615-0145
    • Tae Joo Shin
      Tae Joo Shin
      Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
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      Orcidhttps://orcid.org/0000-0002-1438-3298
    • Hyoung Seop Kim*
      Hyoung Seop Kim
      Graduate Institute of Ferrous & Eco Materials Technology, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
      Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
      *Email: [email protected]
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    • Moon Kee Choi*
      Moon Kee Choi
      Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea
      *Email: [email protected]
      More by Moon Kee Choi
      Orcidhttps://orcid.org/0000-0003-4536-3393
    • Jae Sung Son*
      Jae Sung Son
      Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Gyeongsangbuk-do, Republic of Korea
      *Email: [email protected]
      More by Jae Sung Son
      Orcidhttps://orcid.org/0000-0003-3498-9761
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2025, 17, 16, 24229–24238
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    https://doi.org/10.1021/acsami.5c04420
    Published April 13, 2025
    Copyright © 2025 American Chemical Society
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    Abstract

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    The increasing demand for energy autonomy in microscale and wearable electronics has intensified research interest in thermoelectric thin-film-based power generators. However, the development of such devices is challenging due to the intrinsic brittleness of inorganic materials and the poor performance of thin films. Recently, Ag2S-based compounds have emerged as ductile thermoelectric semiconductors. Nonetheless, the thermoelectric performance of their thin films remains constrained, especially at low temperatures. Herein, we present a solution-processed fabrication of a high-performance AgCuS/Cu2S composite thin film operable below 100 °C. These composite thin films underwent multiple phase transitions below 100 °C, notably increasing the thermoelectric power factors. Furthermore, the films exhibited significant intrinsic stretchability up to a strain of 16.1% owing to their intrinsic ductility. Wrinkled thin-film-based devices demonstrated enhanced power generation owing to multiple phase transitions and retained properties under 30% stretching, highlighting the potential of these films as viable energy harvesters for emerging electronic systems.

    Copyright © 2025 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.5c04420.

    • Additional material characterization, including TGA curves, roughness, thickness, EDS mapping images, XRD patterns, force–indentation depth curves, and power generating performance for the AgCuS/Cu2S composite, and additional experimental details and methods, including photographs of experimental setup (PDF)

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2025, 17, 16, 24229–24238
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.5c04420
    Published April 13, 2025
    Copyright © 2025 American Chemical Society
    Request reuse permissions

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