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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Alloys and Compounds for Thermoelectric and Solar Cell Applications X
Presentation Title Rhombohedral Distortion Elicits High-performance GeTe Theremoelectrics
Author(s) Chen Bo-Chia, Kuang-Kuo Wang, Hsin-Jay Wu
On-Site Speaker (Planned) Chen Bo-Chia
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 210^20 (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:

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