About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Alloys and Compounds for Thermoelectric and Solar Cell Applications XII
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Presentation Title |
Unveiling the effect of Aging on the Crystallinity and Thermoelectric Efficiency of GeTe Thin Films |
Author(s) |
Jyun-Yong Huang, Albert T. Wu |
On-Site Speaker (Planned) |
Jyun-Yong Huang |
Abstract Scope |
GeTe thin film may serve as a promising thermoelectric material with wide-ranging applications. For a thin film thermoelectric module, hot storage serves as an essential test condition, demonstrating long-term reliability. Germanium and Tellurium, with their different vapor pressures, could show a deviation in stoichiometry when the films are subjected to high temperatures for prolonged periods. Varying deposition temperatures might lead to different crystallinity of the received films. Further aging at 350°C and 400°C stabilizes the crystal structures into rhombohedral and cubic forms, respectively. However, films with distinct crystallinity reveal unique surface morphologies, potentially indicating different defect types. These defects can significantly undermine the film's integrity and physical properties. The study aims to understand the formation mechanism of these defects and to develop strategies to mitigate them. The results highlight the impact of long-term aging of the GeTe thin film on the stability of the crystal structure and corresponding thermoelectric performance. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Phase Transformations, Thin Films and Interfaces |