Date/Time: 04-24-2019 - Wednesday - 05:00 PM - 07:00 PM
Huiching Chang4 1 2 Raman Sankar3 Ying-Jay Yang4 Li-Chyong Chen1 Kuei-Hsien Chen2 1

4, Graduate Institute of Electronics Engineering, Taipei, , Taiwan
1, National Taiwan University, Taipei, , Taiwan
2, Academia Sinica, Taipei, , Taiwan
3, Academia Sinica, Taipei, , Taiwan

BiCuTeO is one of the potential thermoelectric materials owing to its low thermal conductivity and high carrier concentration. However, the thermoelectric performance of BiCuTeO is still below average and has a large room 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 the cold-press method. The power factor was enhanced via the nominal oxygen deficiency due to the increased Seebeck coefficient. In addition, the thermal conductivity was reduced due to the decrease in lattice thermal conductivity owing to the small grain size that was generated by the deficiency in the nominal oxygen content. Consequently, the ZT value enhanced to around 11% at 523 K for the stoichiometric BiCuTeO0.94 compared to BiCuTeO. Thus, optimal manipulation of oxygen in BiCuTeO can enhance the thermoelectric performance. This study can be applied to developing the oxides with high thermoelectric performances.

Meeting Program

Symposium Sessions

5:00 PM–7:00 PM Apr 24, 2019 (US - Arizona)

PCC North, 300 Level, Exhibit Hall C-E