期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 10, 期 11, 页码 2420-2431出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ee02530k
关键词
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资金
- National Natural Science Foundation of China [51571007, 51772012, 11404160]
- Beijing Municipal Science & Technology Commission [Z171100002017002]
- Shenzhen Peacock Plan team [KQTD2016022619565911]
- Natural Science Foundation of Guangdong Province [2015A030308001]
- leading talents of Guangdong Province Program [00201517]
- Science, Technology and Innovation Commission of Shenzhen Municipality [KQTD2016022619565991, KQCX2015033110182370]
Nowadays, extensive endeavors have been made to explore the potential thermoelectric performance of SnTe through either enhancing the power factor or reducing its thermal conductivity. Herein, we report that both the power factor and thermal conductivity of SnTe can be simultaneously improved through introducing its analogues (PbTe, PbSe, PbS, SnSe, and SnS) into the SnTe matrix. We found that the power factor of SnTe could be greatly enhanced over the whole temperature range through modifying its band structure via alloying with its analogues, which is supported by density functional calculations. Meanwhile when the solubility limit of PbTe is exceeded, aberration-corrected scanning transmission electron microscopy observations reveal a hierarchical architecture with multi-scale structural defects, resulting in a very low thermal conductivity through scattering phonons of a wide range of wavelength. The combination of simultaneously enhanced power factor and depressed thermal conductivity leads to a maximum ZT similar to 1.1 at 900 K and a high average ZT similar to 0.52 at 300-900 K for Sn0.97Bi0.03Te-3% PbTe, generating a high conversion efficiency of similar to 10%. The present results indicate that SnTe is a robust candidate for medium-temperature thermoelectric power generation.
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