Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 28, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901334
Keywords
continuous phase transition; n-type SnSe crystals; power factor; thermal conductivity; thermoelectrics
Categories
Funding
- National Natural Science Foundation of China [51772012, 51671015, 51571007, 51602143, 11874194]
- National Key Research and Development Program of China [2018YFB0703600]
- Beijing Natural Science Foundation [JQ18004]
- 111 Project [B17002]
- leading talents of Guangdong Province Program [00201517]
- Science, Technology and Innovation Commission of Shenzhen Municipality [KQTD2016022619565991]
- Shanghai talent development funding [2017031]
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Thermoelectric technology enables direct conversion between heat and electricity. The conversion efficiency of a thermoelectric device is determined by the average dimensionless figure of merit ZT(ave). Here, a record high ZT(ave) of approximate to 1.34 in the range of 300-723 K in n-type SnSe based crystals is reported. The remarkable thermoelectric performance derives from the high power factor and the reduced thermal conductivity in the whole temperature range. The high power factor is realized by promoting the continuous phase transition in SnSe crystals through alloying PbSe, which results in a higher symmetry of the crystal structure and the correspondingly modified electronic band structure. Moreover, PbSe alloying induces mass and strain fluctuations, which enables the suppression of thermal transport. These findings provide a new strategy to enhance the thermoelectric performance for the continuous phase transition materials.
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