التفاصيل البيبلوغرافية
| العنوان: |
Achieving zT > 2 in p‐Type AgSbTe2−xSex Alloys via Exploring the Extra Light Valence Band and Introducing Dense Stacking Faults. |
| المؤلفون: |
Hong, Min, Chen, Zhi‐Gang, Yang, Lei, Liao, Zhi‐Ming, Zou, Yi‐Chao, Chen, Yan‐Hui, Matsumura, Syo, Zou, Jin |
| المصدر: |
Advanced Energy Materials; 3/26/2018, Vol. 8 Issue 9, p1-1, 7p |
| مصطلحات موضوعية: |
ANTIMONY alloys, VALENCE bands, STACKING faults (Crystals), POWER factor measurement, PHONON scattering |
| مستخلص: |
Abstract: Through simultaneously enhancing the power factor by engineering the extra light band and enhancing phonon scatterings by introducing a high density of stacking faults, a record figure‐of‐merit over 2.0 is achieved in p‐type AgSbTe2−xSex alloys. Density functional theory calculations confirm the presence of the light valence band with large degeneracy in AgSbTe2, and that alloying with Se decreases the energy offset between the light valence band and the valence band maximum. Therefore, a significantly enhanced power factor is realized in p‐type AgSbTe2−xSex alloys. In addition, transmission electron microscopy studies indicate the appearance of stacking faults and grain boundaries, which together with grain boundaries and point defects significantly strengthen phonon scatterings, leading to an ultralow thermal conductivity. The synergetic strategy of simultaneously enhancing power factor and strengthening phonon scattering developed in this study opens up a robust pathway to tailor thermoelectric performance. [ABSTRACT FROM AUTHOR] |
|
Copyright of Advanced Energy Materials is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder