About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Alloys and Compounds for Thermoelectric and Solar Cell Applications X
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Presentation Title |
Phase Diagram Engineering Enables Lightly Impurity Doping for High-performance GeTe Thermoelectrics |
Author(s) |
Szu-Chien Wu, Yi-Fen Tsai, Hsin-Jay Wu |
On-Site Speaker (Planned) |
Szu-Chien Wu |
Abstract Scope |
Phase diagram engineering has opened a new thermodynamic route for optimizing thermoelectric performance. The SnTe-GeTe alloys form a cubic solid-solution in a wide compositional region when the annealing temperature is below the rhombohedral-GeTe to cubic-GeTe phase transition point (T < 700 K). On the basis of Sn-Ge-Te phase diagram, a structural transition zone exists between the rhombohedral- and cubic-(SnTe, GeTe) solid solution, together with another six multi-phase regions. This structural transition zone enables the lightly impurity doping for SnTe-GeTe alloys, which show the decent electrical conductivity σ and power factor PF = S2σ. The slightly Sb and Bi co-doping could further decrease the thermal conductivity, making the lightly co-doped rhombohedral-GeTe alloys promising as thermoelectric generators. |
Proceedings Inclusion? |
Planned: |