Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 37, Pages 6836-6845Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201602652
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Funding
- startup of South University of Science and Technology of China
- Science, Technology and Innovation Commission of Shenzhen Municipality [JCYJ20140612 140151884]
- National Natural Science Foundation of China [51501086]
- Natural Science Foundation of Guangdong Province, China [2015A030308001]
- Science, Research and Development Foundation of Shenzhen [JCYJ20150831142508365]
- Leading Talents of Guangdong Province Program [00201517]
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P-type polycrystalline SnSe and K0.01Sn0.99Se are prepared by combining mechanical alloying (MA) and spark plasma sintering (SPS). The highest ZT of approximate to 0.65 is obtained at 773 K for undoped SnSe by optimizing the MA time. To enhance the electrical transport properties of SnSe, K is selected as an effective dopant. It is found that the maximal power factor can be enhanced signifi cantly from approximate to 280 mu W m(-1) K-2 for undoped SnSe to approximate to 350 mu W m(-1) K-2 for K-doped SnSe. It is also observed that the thermal conductivity of polycrystalline SnSe can be enhanced if the SnSe powders are slightly oxidized. Surprisingly, after K doping, the absence of Sn oxides at grain boundaries and the presence of coherent nanoprecipitates in the SnSe matrix contribute to an impressively low lattice thermal conductivity of approximate to 0.20 W m(-1) K-1 at 773 K along the sample section perpendicular to pressing direction of SPS. This extremely low lattice thermal conductivity coupled with the enhanced power factor results in a record high ZT of approximate to 1.1 at 773 K along this direction in polycrystalline SnSe.
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