| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications VIII
|
| Presentation Title |
Enhanced Averaged zT in n-type Bi2Te3 via Solubility Control |
| Author(s) |
Wan-Ting Yen, Hsin-jay Wu, Pai-chun Wei |
| On-Site Speaker (Planned) |
Wan-Ting Yen |
| Abstract Scope |
Bismuth telluride (Bi2Te3) has been the most well-established room-temperature thermoelectric material since 1960s. In spite of countless efforts, there is still room for improvement, especially for the n-type counterpart. In this study, we introduced the electron-donor dopants (e.g., Cu, Se, etc.) into the Bi2Te3 alloys whose compositions are guided by a phase diagram that acts like a map navigating toward the n-type conduction zones. The presence of secondary phases in those (Cu,Se)-Bi2Te3 are likely responsible for the n-type conduction, whereas the concentration could be controlled via the dopant solubility. Notably, the power factor is significantly boosted to above 10.6 (mW/mK2) while the thermal conductivity remain unaffected low (κ~2.0-1.6 (W/mK)), leading to an enhanced average zT of 1.1 within 300 K – 550 K. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |