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Reducing Lattice Thermal Conductivity of the Thermoelectric SnSe Monolayer: Role of Phonon–Electron Coupling

SnSe-based materials possess ultrahigh thermoelectric efficiency and show great potential in next-generation thermoelectric devices. The excellent thermoelectric performance of SnSe has been attributed to its ultralow lattice thermal conductivity. In addition to phonon–phonon interactions, grain boundary, and defect and impurity scatterings, phonon–electron coupling also plays a part in the lattice thermal transport of doped materials, yet it is often overlooked. In this work, we investigated the effect of phonon–electron coupling on the lattice thermal conductivity of the thermoelectric SnSe monolayer. We found that the lattice thermal conductivity decreased by as much as 30% when the carrier density exceeded 1013 cm–2 (equivalent to carrier concentration of ∼1020 cm–3), showing the significant suppression effect. Such level of carrier concentration is often required for thermoelectric conversion, so the contribution of phonon–electron coupling to the reduction for lattice thermal conductivity is as much...