Thermoelectric Properties of Concentric Shell Mg2Si-MgO Composite
Deniz Wong1*, Tian-Wey Lan2, Yang-Yuan Chen2, Li-Chyong Chen3, Kuei-Hsien Chen1
1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
2Institute of Physics, Academia Sinica, Taipei, Taiwan
3Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan
* presenting author:Deniz Wong,
Thermoelectric effect has shown promise in contributing a clean and sustainable source in the ever increasing demand of energy in our world today. However, thermoelectric-based technologies are still saddled by inefficient or toxic materials which makes wide spread commercialization difficult. Silicide-based materials such as magnesium silicide have been developed within the past decade with great potential in terms of materials requirement and technological efficiency. One of the factors that limit the efficiency of this material is the high thermal conductivity compared to other state-of-the-art materials reported in literature. In this study, we have come up with a novel concentric shell structure that can reduce its thermal conductivity while offering reasonable Seebeck coefficient and electrical conductivity. Furthermore, our proposed method also utilizes low-cost raw material in common glass which benefits the industrial feasibility of this thermoelectric material. The study also discusses how our approach contributed to the enhanced thermoelectric performance with several proposed direction for its further development.

Keywords: Thermoelectrics, Silicides, Composites, Thermal Conductivity