| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XI
|
| Presentation Title |
Crystal Structure, Phase Stability, and Thermoelectric Properties of Medium-Temperature IV-VI Thermoelectric Materials |
| Author(s) |
Hsin-Jay Wu, Szu-Chien Wu |
| On-Site Speaker (Planned) |
Hsin-Jay Wu |
| Abstract Scope |
Thermoelectric materials can directly convert thermal energy into electrical energy, becoming one of the promising green energies in recent years. Two medium-temperature IV-VI thermoelectric materials, SnTe and GeTe, are brought together to form the (SnTe-GeTe)-based alloys to tune the transport properties using phase diagram engineering. Herein, ternary Sn-Ge-Te and part of binary Ge-Te phase diagrams were constructed experimentally. Regarding thermoelectric properties, the Bridgman-grown Ge-doped Sn1-yGeyTe alloys show enhanced Seebeck coefficients and reduced thermal conductivity. The Pb-doped Sn0.7Ge0.3Te alloy performed an improved zT = 0.82, showing 600 % enhancement compared with the pristine SnTe. The TEM analysis of Pb-doped Sn0.7Ge0.3Te revealed the presence of dislocation networking, unpuzzling the mechanism for the enhanced phonon scattering. In short, this study successfully utilizes a synergistic approach of phase diagram engineering, carrier optimization, and defect controlling to optimize the TE performance of IV-VI compounds. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Phase Transformations, Characterization |