| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XIII
|
| Presentation Title |
Enhancing the Stability and Efficiency of Environmental-friendly Phonon-Glass Electron-Crystal Thermoelectric Materials |
| Author(s) |
Hsin-Jay Wu |
| On-Site Speaker (Planned) |
Hsin-Jay Wu |
| Abstract Scope |
β-Zn₄Sb₃ demonstrates a high Seebeck coefficient and low thermal conductivity, but its thermal stability is hindered by mobile cations and zinc interstitials. Recent developments are focused on improving its zT value through phase diagram engineering, defect engineering, and external doping. The addition of cation dopants such as gallium and aluminum to β-Zn₄Sb₃ reduces zinc mobility, optimizes hole carrier concentration, and enhances structural stability. For example, (Zn₀.₉₉₂Ga₀.₀₀₈)₄Sb₃ achieves an extremely low lattice thermal conductivity of 0.2 W m⁻¹ K⁻¹, while Al-doped Zn₄Sb₃ exhibits a 20% higher power factor compared to the undoped material. These modifications lead to a fully dense β-Zn₄Sb₃ with a zT value exceeding 1.4 at 623 K and a conversion efficiency (η) of 3%. This strategy stabilizes the single-phase β-Zn₄Sb₃ and enhances its thermoelectric performance in the mid-temperature range. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Energy Conversion and Storage, Sustainability, Phase Transformations |