Journal
SCIENCE
Volume 351, Issue 6269, Pages 141-144Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aad3749
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Funding
- U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences [DE-SC0014520]
- S3TEC-EFRC [DE-SC0001299]
- Beihang University
- Recruitment Program for Young Professionals
- National Natural Science Foundation of China [51571007]
- Science, Technology and Innovation Commission of Shenzhen Municipality [ZDSYS20141118160434515]
- Guangdong Science and Technology Fund [2015A030308001]
- Energy Frontier Research Centers (EFRC) [DE-SC0001054]
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Thermoelectric technology, harvesting electric power directly from heat, is a promising environmentally friendly means of energy savings and power generation. The thermoelectric efficiency is determined by the device dimensionless figure of merit ZT(dev), and optimizing this efficiency requires maximizing ZT values over a broad temperature range. Here, we report a record high ZT(dev) similar to 1.34, with ZT ranging from 0.7 to 2.0 at 300 to 773 kelvin, realized in hole-doped tin selenide (SnSe) crystals. The exceptional performance arises from the ultrahigh power factor, which comes from a high electrical conductivity and a strongly enhanced Seebeck coefficient enabled by the contribution of multiple electronic valence bands present in SnSe. SnSe is a robust thermoelectric candidate for energy conversion applications in the low and moderate temperature range.
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