| 학회 | 한국화학공학회 |
| 학술대회 | 2020년 가을 (10/14 ~ 10/16, e-컨퍼런스) |
| 권호 | 26권 1호, p.614 |
| 발표분야 | 이동현상 |
| 제목 | Optimizing electrical and thermal transport properties of n-type Bi2Te3-based materials for room-temperature theremoelectric application |
| 초록 | Bi2Te3 has been the most efficient system for near-room temperature thermoelectric (TE) applications. Because TE modules consist of numerous pairs of p- and n-type TE legs, it is important to improve both types of materials with high TE performance. Compared to the reported TE performances of p-type Bi2Te3-based materials, the progress of n-type counterparts has been retarded because of limited dopants and substituents for suppessing their thermal transport with minimizing the deterioration of electrical transport properties. Here, we report high performance n-type Bi2Te3–based system via introducing K2Sex (x = 1 – 6). We demonstrate that the incorporation of K2Sex effectively induces multi-scale microstructures in Bi2Te3 matrix, resulting in the increased phonon scattering. As a result, the best performing member of these systems shows the significantly reduced lattice thermal conductivity (κlat) down to ~ 0.57 W·m-1·K-1 and remarkably high peak TE figure of merit (ZT) of ~ 1.12 at 397 K and average ZT over unity in the wide range of temperature from 300 K to 500 K. |
| 저자 | 이형석, 정인 |
| 소속 | 서울대 |
| 키워드 | 이동현상 |
| 원문파일 | 초록 보기 |
