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Organic thermoelectric device utilizing charge transfer interface as the charge generation by harvesting thermal energy

Author

Listed:
  • Shun Kondo

    (Kyushu University)

  • Mana Kameyama

    (Kyushu University)

  • Kentaro Imaoka

    (Kyushu University)

  • Yoko Shimoi

    (Materials Open Laboratory (MOL))

  • Fabrice Mathevet

    (Kyushu University
    Institut Parisien de Chimie Moléculaire (IPCM))

  • Takashi Fujihara

    (GCE Institute Inc.)

  • Hiroshi Goto

    (GCE Institute Inc.)

  • Hajime Nakanotani

    (Kyushu University
    Kyushu University)

  • Masayuki Yahiro

    (Materials Open Laboratory (MOL))

  • Chihaya Adachi

    (Kyushu University
    Kyushu University)

Abstract

We propose an organic thermoelectric device having a new power generation mechanism that extracts small-scale thermal energy, i.e., a few tens of millielectronvolts, at room temperature without a temperature gradient. We demonstrate a new operating mechanism based on an organic thermoelectric power generation architecture that uses the charge separation capabilities of organic charge transfer (CT) interfaces composed of copper (II) phthalocyanine and copper (II) 1,2,3,4,8,9,10,11,15,16,17,18,22,23,24,25-hexadecafluoro-29H,31H-phthalocyanine as the donor and acceptor, respectively. With the optimized device architecture, values of open-circuit voltage VOC of 384 mV, short-circuit current density JSC of 1.1 μA/cm2, and maximum output Pmax of 94 nW/cm2 are obtained. The temperature characteristics of the thermoelectric properties yield activation energy values of approximately 20–60 meV, confirming the low-level thermal energy’s contribution to the power generation mechanism. Furthermore, from surface potential analysis using a Kelvin probe, we confirm that charges are generated at the CT interface, and the electrons and holes are diffused to the counter-electrodes with the aid of Fermi-level alignment between adjacent layers.

Suggested Citation

  • Shun Kondo & Mana Kameyama & Kentaro Imaoka & Yoko Shimoi & Fabrice Mathevet & Takashi Fujihara & Hiroshi Goto & Hajime Nakanotani & Masayuki Yahiro & Chihaya Adachi, 2024. "Organic thermoelectric device utilizing charge transfer interface as the charge generation by harvesting thermal energy," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52047-5
    DOI: 10.1038/s41467-024-52047-5
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    References listed on IDEAS

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