期刊
ADVANCED SCIENCE
卷 7, 期 12, 页码 -出版社
WILEY
DOI: 10.1002/advs.201902628
关键词
band convergence; dislocations; lattice strain; PbTe; thermoelectronics
资金
- National Key Research and Development Program of China [2018YFB0703600]
- National Natural Science Foundation of China [51861145305, 51772215]
- Fundamental Research Funds for Science and Technology Innovation Plan of Shanghai [18JC1414600]
- RGC [17200017, 17300018]
In-grain dislocation-induced lattice strain fluctuations are recently revealed as an effective avenue for minimizing the lattice thermal conductivity. This effect could be integratable with electronic enhancements such as by band convergence, for a great advancement in thermoelectric performance. This motivates the current work to focus on the thermoelectric enhancements of p-type PbTe alloys, where monotelluride-alloying and Na-doping are used for a simultaneous manipulation on both dislocation and band structures. As confirmed by synchrotron X-ray diffractions and Raman measurements, the resultant dense in-grain dislocations induce lattice strain fluctuations for broadening the phonon dispersion, leading to an exceptionally low lattice thermal conductivity of approximate to 0. 4 W m-K-1. Band structure calculations reveal the convergence of valence bands due to monotelluride-alloying. Eventually, the integration of both electronic and thermal improvements lead to a realization of an extraordinary figure of merit zT of approximate to 2.5 in Na0.03Eu0.03Cd0.03Pb0.91Te alloy at 850 K.
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