About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIV
|
| Presentation Title |
Performance Optimization and Verification of GeTe-Based Thermoelectric Modules |
| Author(s) |
Yi-Hsuan Lai, Yun-Han Huang Lu, Hsin-jay Wu |
| On-Site Speaker (Planned) |
Yi-Hsuan Lai |
| Abstract Scope |
This study improved both the GeTe-based thermoelectric materials and their performance in device applications. Sb doping was used to optimize carrier concentration and reduce thermal conductivity, while a dilute amount of Cu improved carrier mobility and electrical conductivity. Ge0.9Cu0.01Sb0.1Te achieved zT of 1.4 at 623 K, representing a 137% improvement over GeTe. A single-leg module of this composition achieved a conversion efficiency of 5.4% under ΔT = 400 K, compared to 1.5% for the GeTe. However, Sb doping lowers the phase transition temperature, which can induce cracking and facilitate Cu diffusion into cracks at the hot side. As a results, a medium-entropy alloy (MEA) thin film was introduced as a contact layer, effectively improving the interface stability. Heat flow analysis and device ZT efficiency correction confirmed the actual module performance. This work demonstrates a comprehensive enhancement and verification of energy conversion efficiency in GeTe-based thermoelectric modules, supported by improved interface optimization. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Energy Conversion and Storage, Sustainability |