About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XI
|
Presentation Title |
C-5: Low Crystallinity Cu-Te-S Compounds Elicit Ultralow Lattice Thermal Conductivity in GeTe Thermoelectric Materials |
Author(s) |
Yi-Fen Tsai, Hsin-Jay Wu |
On-Site Speaker (Planned) |
Yi-Fen Tsai |
Abstract Scope |
The promising thermoelectric material, germanium-telluride (GeTe), is one of the attractive based materials due to its outstanding electrical performance. The over-high thermal conductivity limited the TE performance in pristine GeTe. This work induced the liquid-like Cu2S with an ultralow thermal conductivity in the GeTe matrix. Compared to the high-cost material GeTe, cost-effective Cu2S has the characteristics of eco-friendly and is abundant on earth. The low crystallinity CuTeS compounds form in Cu2S-alloying GeTe as secondary phases, causing severe phonon scattering. The ultralow lattice thermal conductivity beats the amorphous limit from the Debye-Cahill model and boots the zT to 1.4 at 700 K. |
Proceedings Inclusion? |
Planned: |