About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications XI
|
Presentation Title |
Mixing Amorphous and Crystalline Structures for High Performance n-type Bi2Te3 Thermoelectrics |
Author(s) |
Wan-Ting Yen, Hsin-jay Wu, Kuang-Kuo Wang |
On-Site Speaker (Planned) |
Wan-Ting Yen |
Abstract Scope |
Bismuth telluride-based thermoelectric (TE) materials have been widely used in waste heat recovery and thermoelectric (TE) coolers. However, the peak zT of n-type Bi2Te3 is lower than the p-type counterparts, hindering the conversion efficiency for a Bi2Te3-based device. In this work, the TE performance of n-type Bi2Te3 is improved by doping a dilute amount of liquid-like copper chalcogenides Cu2X (X = S, Se, Te), yielding the ultrahigh carrier mobility as fluxes of the highly-mobile Cu ions are introduced. Meanwhile, the chalcogenide anions induce severe crystal imperfections, leading to the low κL that lay close to the amorphous limit of Bi2Te3. A hybrid of crystalline materials with liquid-like superionic conductors paves a new route for designing high-performance TE alloys. |
Proceedings Inclusion? |
Planned: |