About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XII
|
Presentation Title |
Synthesis and Thermoelectric Properties of Bulk Tellurene: The 2D Form of Tellurium |
Author(s) |
Zhenyu Pan, Xinbo Zhang, Yuanbing Mao, Heng Wang |
On-Site Speaker (Planned) |
Heng Wang |
Abstract Scope |
Low-dimensional thermoelectric materials systems have been widely studied for improved thermoelectric performance, due to quantum-confinement effects and the decreased thermal conductivity caused by the numerous internal interfaces. Two-dimensional(2D) tellurium under the name tellurene is a newly discoved 2D material, which showed desirable features for thermoelectrics. In this work, high-quality tellurene nanoflakes were synthesized by hydrothermal method and assembled into nanostructured bulk materials by low temperature hot press to investigate their thermoelectric performance. The organic surface ligands used in the hydrothermal synthesis process were removed by ultraviolet-ozone(UVO) treatment to mitigate their impact on carrier mobility. Doping was achieved by Sb2Te3-based chalcogenidometalates(ChaM) surfactant which can decompose into phase-pure Sb2Te3 in-situ on the surface of tellurene nanoflakes, acting as a surface dopant. The Seebeck coefficient of tellurene sample increased about 20% compared to bulk tellurium and the thermal conductivity decreased 43%. Overall, tellurene showed a zT of 0.1 at room temperature, which is comparable to bulk tellurium. The carrier mobility is still low compared to bulk tellurium, which has prevented us from achieving higher zTs. With better strategies to further improve the mobility, bulk tellurene could be a promising, solution-processable thermoelectric material at room temperature with moderate zTs. |
Proceedings Inclusion? |
Planned: |