凝聚态物理
声子
热电材料
材料科学
热电效应
带隙
声子散射
散射
热导率
光学
物理
热力学
复合材料
作者
Yixuan Wu,Pengfei Nan,Zhiwei Chen,Zhaoliang Zeng,Siqi Lin,Xinyue Zhang,Hongliang Dong,Zhiqiang Chen,Hongkai Gu,Wen Li,Yue Chen,Binghui Ge,Yanzhong Pei
出处
期刊:Research
[AAAS00]
日期:2020-01-01
卷期号:2020
被引量:18
标识
DOI:10.34133/2020/8151059
摘要
Maximizing band degeneracy and minimizing phonon relaxation time are proven to be successful for advancing thermoelectrics. Alloying with monotellurides has been known to be an effective approach for converging the valence bands of PbTe for electronic improvements, while the lattice thermal conductivity of the materials remains available room for being further reduced. It is recently revealed that the broadening of phonon dispersion measures the strength of phonon scattering, and lattice dislocations are particularly effective sources for such broadening through lattice strain fluctuations. In this work, a fine control of MnTe and EuTe alloying enables a significant increase in density of electron states near the valence band edge of PbTe due to involvement of multiple transporting bands, while the creation of dense in-grain dislocations leads to an effective broadening in phonon dispersion for reduced phonon lifetime due to the large strain fluctuations of dislocations as confirmed by synchrotron X-ray diffraction. The synergy of both electronic and thermal improvements successfully leads the average thermoelectric figure of merit to be higher than that ever reported for p-type PbTe at working temperatures.
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