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Enhanced Thermoelectric Performance via Oxygen Manipulation in BiCuTeO

Published online by Cambridge University Press:  14 February 2019

Hui-Ching Chang,
Hao-Jen You,
Raman Sankar,
Ying-Jay Yang,
Li-Chyong Chen and
Kuei-Hsien Chen
Hui-Ching Chang*
Affiliation:
Graduate Institute of Electronics Engineering, National Taiwan University, Taipei City10617, TaiwanCenter for Condensed Matter Sciences, National Taiwan University, Taipei City10617, TaiwanInstitute of Atomic and Molecular Sciences, Academia Sinica, Taipei City10617, Taiwan
Hao-Jen You
Affiliation:
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei City10617, Taiwan
Raman Sankar
Affiliation:
Institute of Physics, Academia Sinica, Taipei, Taiwan
Ying-Jay Yang
Affiliation:
Graduate Institute of Electronics Engineering, National Taiwan University, Taipei City10617, Taiwan
Li-Chyong Chen
Affiliation:
Center for Condensed Matter Sciences, National Taiwan University, Taipei City10617, Taiwan
Kuei-Hsien Chen
Affiliation:
Center for Condensed Matter Sciences, National Taiwan University, Taipei City10617, TaiwanInstitute of Atomic and Molecular Sciences, Academia Sinica, Taipei City10617, Taiwan
*
*(Email: d01943020@ntu.edu.tw)
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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.

Keywords

thermal conductivityscanning electron microscopy (SEM)x-ray diffraction (XRD)oxidedefects

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Type
Articles
Information
MRS Advances , Volume 4 , Issue 8: Thermal Properties and Thermoelectric Materials , 2019, pp. 499 - 505
Copyright
Copyright © Materials Research Society 2019 

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