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Enhanced Thermoelectric Performance via Oxygen Manipulation in BiCuTeO

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Abstract

BiCuTeO is a potential thermoelectric material owing to its low thermal conductivity and high carrier concentration. However, the thermoelectric performance of BiCuTeO is still below average and has much scope for improvement. In this study, we manipulated the nominal oxygen content in BiCuTeO and synthesized BiCuTeOx (x = 0.94–1.06) bulks by a solid-state reaction and pelletized them by a cold-press method. The power factor was enhanced by varying the nominal oxygen deficiency due to the increased Seebeck coefficient. The thermal conductivity was also reduced due to the decrease in lattice thermal conductivity owing to the small grain size generated by the optimal nominal oxygen content. Consequently, the ZT value was enhanced by ∼11% at 523 K for stoichiometric BiCuTeO0.94 compared to BiCuTeO. Thus, optimal oxygen manipulation in BiCuTeO can enhance the thermoelectric performance. This study can be applied to developing oxides with high thermoelectric performances.

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Authors and Affiliations

  1. Graduate Institute of Electronics Engineering, National Taiwan University, Taipei City, 10617, Taiwan

    Hui-Ching Chang & Ying-Jay Yang

  2. Center for Condensed Matter Sciences, National Taiwan University, Taipei City, 10617, Taiwan

    Hui-Ching Chang, Li-Chyong Chen & Kuei-Hsien Chen

  3. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei City, 0617, Taiwan

    Hui-Ching Chang, Hao-Jen You & Kuei-Hsien Chen

  4. Institute of Physics, Academia Sinica, Taipei, Taiwan

    Raman Sankar

Authors
  1. Hui-Ching Chang
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  2. Hao-Jen You
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  3. Raman Sankar
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  4. Ying-Jay Yang
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  5. Li-Chyong Chen
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  6. Kuei-Hsien Chen
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Chang, HC., You, HJ., Sankar, R. et al. Enhanced Thermoelectric Performance via Oxygen Manipulation in BiCuTeO. MRS Advances 4, 499–505 (2019). https://doi.org/10.1557/adv.2019.115

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  • DOI: https://doi.org/10.1557/adv.2019.115

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