期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 3, 页码 2908-2913出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00278
关键词
thermoelectric material; SnSe2; ultralow thermal conductivity; Br doping; single crystal
资金
- National Research Foundation of Korea [NRF-2019R1F1A1058473, NRF -2019 R1A6A1A11053838, d NR F 2020K1A4A7A02095438]
Pure and large Br-doped SnSe2 single crystals were successfully synthesized, leading to an improvement in power factor, especially along the in-plane direction. Anisotropy was observed in thermal conductivity and ZT values.
In this work, pure, large Br-doped SnSe 2 single crystals were successfully synthesized using the temperature gradient technique. Br acts as a donor, resulting in electron concentrations up to similar to 6.83 X 10(19) cm(-3) at room temperature. All samples exhibited metal-like electrical resistivities and Seebeck coefficient behaviors over a temperature range of 300-673 K. Br doping greatly improved the power factor, especially along the in-plane direction. We observed anisotropy in the electrical conductivity, Seebeck coefficient, and, most notably, thermal conductivity. An ultralow thermal conductivity was achieved along the out-of-plane direction, leading to a maximum ZT, of 0.54 at 673 K in the Br-doped sample, which is twice as large as that of the in-plane direction, ZT(a) = 0.25.
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