About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Alloys and Compounds for Thermoelectric and Solar Cell Applications X
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Presentation Title |
Rhombohedral Distortion Elicits High-performance GeTe Theremoelectrics |
Author(s) |
Bo-Chia Chen, Kuang-Kuo Wang, Hsin-Jay Wu |
On-Site Speaker (Planned) |
Bo-Chia Chen |
Abstract Scope |
Phase diagram engineering can probe the high zT zone for a multicomponent thermoelectric (TE) alloys by determining the maximal dopant solubility, which guides the inter-correlation between phase, microstructure, and thermal/electrical properties. GeTe-based alloys show intrinsically-high thermal conductivity , while the substitution of Ge by Bi substantially reduce the from 8 to 1.2 Wm-1K-1 at 323 K in the alloys of Ge1-xBixTe. As revealed by synchrotron XRD and TEM analysis, the co-existence of severe lattice distortion and high-density stacking faults brings down the . In addition to the enhanced phonon scattering, the carrier concentration of Ge1-xBixTe drops from 9.5 ×10^20 to 2×10^20 (cm-3). In one word, Ge0.9Bi0.1Te shows a low-lying and a high peak zT of 1.9 at 713 K, resulting from a high degree of rhombohedral distortion caused by the high-dose of Bi solubility. |
Proceedings Inclusion? |
Planned: |