| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Excitonic optical properties in monolayer SnP2S6 |
| Peng-Yuan Chen(陈鹏远), Zhen Quan(权真), and Shu-Dong Wang(王舒东)† |
| School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China |
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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 SnP$_{2}$S$_{6}$. Our findings reveal that the excitonic effect dominates the optical absorption spectra in the visible light range, and the lowest-energy exciton $X_{0}$ in monolayer SnP$_{2}$S$_{6}$ is optically bright with the binding energy of 0.87 eV and the radiative lifetime of $\sim 10^{-11}$ s, which is highly advantageous to the photo-luminescence. Most importantly, the absence of optically forbidden states below the bright states $X_{0}$ would give rise to a high quantum efficiency of 2D SnP$_{2}$S$_{6}$. We also find that applied biaxial strain can further shorten the radiative lifetime of the bright states. These results imply that 2D SnP$_{2}$S$_{6}$ is a promising candidate for the optoelectronic devices.
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Received: 18 July 2024
Revised: 20 August 2024
Accepted manuscript online: 27 August 2024
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PACS:
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71.35.-y
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(Excitons and related phenomena)
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71.35.Cc
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(Intrinsic properties of excitons; optical absorption spectra)
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31.15.ag
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(Excitation energies and lifetimes; oscillator strengths)
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73.43.Cd
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(Theory and modeling)
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| 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
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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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