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 SnPS. Our findings reveal that the excitonic effect dominates the optical absorption spectra in the visible light range, and the lowest-energy exciton in monolayer SnPS is optically bright with the binding energy of 0.87 eV and the radiative lifetime of s, which is highly advantageous to the photo-luminescence. Most importantly, the absence of optically forbidden states below the bright states would give rise to a high quantum efficiency of 2D SnPS. We also find that applied biaxial strain can further shorten the radiative lifetime of the bright states. These results imply that 2D SnPS is a promising candidate for the optoelectronic devices.
Fund: Project support by the National Natural Science Foundation of China (Grant No. 12064032).
Corresponding Authors:
Shu-Dong Wang
E-mail: sdwang@imu.edu.cn
Cite this article:
Peng-Yuan Chen(陈鹏远), Zhen Quan(权真), and Shu-Dong Wang(王舒东) Excitonic optical properties in monolayer SnP2S6 2024 Chin. Phys. B 33 107105
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