%0 Journal Article
%T n-Type Ultrathin Few-Layer Nanosheets of Bi-Doped SnSe: Synthesis and Thermoelectric Properties
%J -
%D 2018
%R https://doi.org/10.1021/acsenergylett.8b00399
%X SnSe, an environmentally friendly layered chalcogenide, has fostered immense attention in the thermoelectric community with its high thermoelectric figure of merit in single crystals. Although the stride toward developing superior p-type SnSe as a thermoelectric material is progressing rapidly, synthesis of n-type SnSe is somewhat overlooked. Here, we report the solution-phase synthesis and thermoelectric transport properties of two-dimensional (2D) ultrathin (1.2¨C3 nm thick) few-layer nanosheets (2¨C4 layers) of n-type SnSe. The n-type nature of the nanosheets initially originates from chlorination of the material during the synthesis. We could increase the carrier concentration of n-type SnSe significantly from 3.08 ¡Á 1017 to 1.97 ¡Á 1018 cm¨C3 via further Bi doping, which results in an increase of electrical conductivity and power factor. Furthermore, Bi-doped nanosheets exhibit ultralow lattice thermal conductivity (¡«0.3 W/mK) throughout the temperature range of 300¨C720 K, which can be ascribed to the effective phonon scattering by an interface of SnSe layers, nanoscale grain boundaries, and point defects
%U https://pubs.acs.org/doi/10.1021/acsenergylett.8b00399