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Science. 2016 Jan 8;351(6269):141-4. doi: 10.1126/science.aad3749. Epub 2015 Nov 26.

Ultrahigh power factor and thermoelectric performance in hole-doped single-crystal SnSe.

Author information

1
School of Materials Science and Engineering, Beihang University, Beijing 100191, China. Department of Chemistry, Northwestern University, Evanston, IL 60208, USA. zhaolidong@buaa.edu.cn m-kanatzidis@northwestern.edu.
2
Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
3
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
4
Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China.
5
School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
6
Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA.
7
Materials Science, California Institute of Technology, Pasadena, CA 91125, USA.
8
Department of Chemistry, Northwestern University, Evanston, IL 60208, USA. zhaolidong@buaa.edu.cn m-kanatzidis@northwestern.edu.

Abstract

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) ∼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.

PMID:
26612831
DOI:
10.1126/science.aad3749
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