Enhanced the Thermoelectric Performance of Natural Superlattice BiCuTeO by Manipulation of Composition
H.C. Chang(張惠菁)1,2,3*, Deniz P. Wong1, R. Sankar2, C.E. Chang(張承恩)2, Y.J. Yang(楊英杰)3, F.C. Chou(周方正)2, L.C. Chen(林麗瓊)2, K.H. Chen(陳貴賢)1
1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
2Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan
3Graduate Institute of Electronics Engineering, National Taiwan University, Taipei, Taiwan
* presenting author:張惠菁, email:d01943020@ntu.edu.tw
Oxychalcogenide-based compounds are reported to be one of the promising thermoelectric materials in recent years. Due to its natural superlattice structural configuration, the material offers lower thermal conductivity with reasonable power factor. The novelty of this material has garnered attention in further improving its thermoelectric properties. In this study, we investigated the thermoelectric properties of bismuth copper oxytelluride (BiCuTeO) samples after manipulating the initial elemental composition. By slightly changing the initial amounts of the element in the BiCuTeO compound, we are able to influence its electronic properties and consequently, its thermoelectric properties. Our study has identified that by creating bismuth and copper deficient BiCuTeO compound an optimal thermoelectric efficiency (ZT = 0.6) is achieved.

Keywords: thermoelectric, BiCuTeO, ZT, bismuth copper oxytelluride , thermal conductivity