Super Large Sn 1-x Se Single Crystals with Excellent Thermoelectric Performance

Authors

Min Jin, Shanghai Dianji University
Xiao-Lei Shi, University of Queensland
Tianli Feng, Vanderbilt University
Weidi Liu, University of Queensland
Haifeng Feng, University of WollongongFollow
Sokrates Pantelides, Vanderbilt University
Jun Jiang, Chinese Academy Of Sciences
Yunxia Chen, Shanghai Dianji University
Yi Du, University of WollongongFollow
Jin Zou, University of Queensland
Zhi-Gang Chen, University of Southern Queensland

RIS ID

133887

Publication Details

Jin, M., Shi, X., Feng, T., Liu, W., Feng, H., Pantelides, S., Jiang, J., Chen, Y., Du, Y., Zou, J. & Chen, Z. (2019). Super Large Sn 1-x Se Single Crystals with Excellent Thermoelectric Performance. ACS Applied Materials and Interfaces, 11 (8), 8051-8059.

Abstract

SnSe single crystals have drawn extensive attention for their ultralow thermal conductivity and outstanding thermoelectric performance. Here, we report super large Sn 1-x Se single crystals with excellent thermoelectric properties, fabricated via an advanced horizontal Bridgman technique with great yield and high reproducibility. The obtained single crystals have a super large size of â70 x 50 x 15 mm with a considerable weight of 148 g, which leads to a record-high mass density of >6.1 g cm -3 . Extensive chemical characterization demonstrates that â0.3% Sn vacancies are present, which results in a large concentration of holes, â1.2 x 10 19 cm -3 , and an enhanced power factor of â6.1 μW cm -1 K -2 at 793 K. Simultaneously, the Sn-vacancy-induced lattice distortions result in a low thermal conductivity of â0.39 W m -1 K -1 at 793 K, leading to a competitive ZT of â1.24. This work demonstrates that large-size off-stoichiometric SnSe single crystals hold promise to achieve high thermoelectric performance.