1. High-quality SnSe2single crystals: Electronic and thermoelectric properties
- Author
-
Pham, AT, Vu, TH, Cheng, C, Trinh, TL, Lee, JE, Ryu, H, Hwang, C, Mo, SK, Kim, J, Zhao, LD, Duong, AT, and Cho, S
- Subjects
thermoelectric material ,single crystal ,SnSe2 ,ultralow thermal conductivity ,ARPES - Abstract
High-quality SnSe2 single crystals were successfully synthesized using a temperature gradient method. N-type characteristics and strong anisotropic transport properties of SnSe2 single crystals were exhibited between the ab plane and the c-axis. At 673 K, the power factor (PF) value along the ab plane is 3.43 μW cm-1 K-2, while it is 0.92 μW cm-1 K-2 along the c-axis. The ratio between thermal conductivities along the ab plane (κab) and c-axis (κc) is on the order of 7.6 at 300 K, while this value is about 5.6 at 673 K. The thermoelectric figure of merit (ZT) in the c-axis (0.15) is higher than that (0.1) along the ab plane, according to the ultralow out-of-plane thermal conductivity. The electronic band structure results, which were examined by angle-resolved photoemission spectroscopy (ARPES) predicted the potential of improving the thermoelectric performance of SnSe2 single crystals by electron doping.
- Published
- 2020