| Autor: |
Sang Il, Kim, Kyu Hyoung, Lee, Hyeon A, Mun, Hyun Sik, Kim, Sung Woo, Hwang, Jong Wook, Roh, Dae Jin, Yang, Weon Ho, Shin, Xiang Shu, Li, Young Hee, Lee, G Jeffrey, Snyder, Sung Wng, Kim |
| Rok vydání: |
2015 |
| Zdroj: |
Science (New York, N.Y.). 348(6230) |
| ISSN: |
1095-9203 |
| Popis: |
The widespread use of thermoelectric technology is constrained by a relatively low conversion efficiency of the bulk alloys, which is evaluated in terms of a dimensionless figure of merit (zT). The zT of bulk alloys can be improved by reducing lattice thermal conductivity through grain boundary and point-defect scattering, which target low- and high-frequency phonons. Dense dislocation arrays formed at low-energy grain boundaries by liquid-phase compaction in Bi(0.5)Sb(1.5)Te3 (bismuth antimony telluride) effectively scatter midfrequency phonons, leading to a substantially lower lattice thermal conductivity. Full-spectrum phonon scattering with minimal charge-carrier scattering dramatically improved the zT to 1.86 ± 0.15 at 320 kelvin (K). Further, a thermoelectric cooler confirmed the performance with a maximum temperature difference of 81 K, which is much higher than current commercial Peltier cooling devices. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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