Abstract
Abstract Quantum confinement effect and reduced dielectric screening in two-dimensional (2D) dramatically enhance the electron-hole interactions. In this work, we use many-body perturbation theory and Bethe-Salpeter equation (BSE) to investigate the electronic and excitonic optical properties of monolayer SnP2S6. Our findings reveal that the excitonic effect dominate the optical absorption spectra in the visible light range, and the lowest-energy exciton X0 in monolayer SnP2S6 is optically bright with the binding energy of 0.87 eV and the radiative lifetime of ~10-11 s, which is highly advantageous to the photo luminescence. Most importantly, the absence of optically forbidden sates below the bright states X0 would give rise to a high quantum efficiency of 2D SnP2S6. We also find that applied biaxial strain can further shorten the radiative lifetime of the bright states. These results imply that 2D SnP2S6 is a promising candidate for the optoelectronic devices.
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