Excitonic optical properties in monolayer SnP2S6

doi:10.1088/1674-1056/ad73b5

中国物理B ›› 2024, Vol. 33 ›› Issue (10): 107105-107105.doi: 10.1088/1674-1056/ad73b5

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

收稿日期:2024-07-18 修回日期:2024-08-20 接受日期:2024-08-27 发布日期:2024-09-21
通讯作者: Shu-Dong Wang E-mail:sdwang@imu.edu.cn
基金资助:
Project support by the National Natural Science Foundation of China (Grant No. 12064032).

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

Received:2024-07-18 Revised:2024-08-20 Accepted:2024-08-27 Published:2024-09-21
Contact: Shu-Dong Wang E-mail:sdwang@imu.edu.cn
Supported by:
Project support by the National Natural Science Foundation of China (Grant No. 12064032).

摘要/Abstract

摘要： 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.

关键词: excitons, radiative lifetime, SnP$_{2}$S$_{6}$

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.

Key words: excitons, radiative lifetime, SnP$_{2}$S$_{6}$

中图分类号: (Excitons and related phenomena)

71.35.-y

71.35.Cc (Intrinsic properties of excitons; optical absorption spectra) 31.15.ag (Excitation energies and lifetimes; oscillator strengths) 73.43.Cd (Theory and modeling)

Peng-Yuan Chen(陈鹏远), Zhen Quan(权真), and Shu-Dong Wang(王舒东). Excitonic optical properties in monolayer SnP₂S₆[J]. 中国物理B, 2024, 33(10): 107105-107105.

Peng-Yuan Chen(陈鹏远), Zhen Quan(权真), and Shu-Dong Wang(王舒东). Excitonic optical properties in monolayer SnP₂S₆[J]. Chin. Phys. B, 2024, 33(10): 107105-107105.

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Excitonic optical properties in monolayer SnP₂S₆

Excitonic optical properties in monolayer SnP₂S₆

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