Journal of Inorganic Materials ›› 2022, Vol. 37 ›› Issue (5): 527-533.DOI: 10.15541/jim20210317

Special Issue: 【虚拟专辑】计算材料 【信息功能】Max层状材料、MXene及其他二维材料

• RESEARCH ARTICLE • Previous Articles     Next Articles

Plane Strain on Band Structures and Photoelectric Properties of 2D Monolayer MoSi2N4

YUAN Gang1, MA Xinguo1,2(), HE Hua2, DENG Shuiquan3, DUAN Wangyang1, CHENG Zhengwang1, ZOU Wei1   

  1. 1. School of Science, Hubei University of Technology, Wuhan 430068, China
    2. Hubei Engineering Technology Research Center of Energy Photoelectric Device and System, Wuhan 430068, China
    3. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
  • Received:2021-05-18 Revised:2021-07-06 Published:2022-05-20 Online:2021-11-01
  • Contact: MA Xinguo, professor. E-mail: maxg2013@sohu.com
  • About author:YUAN Gang (1998-), male, Master candidate. E-mail: marvinyuan@163.com
  • Supported by:
    Science Foundation of State Key Laboratory of Structural Chemistry(20210028);National Natural Science Foundation of China(51472081)

Abstract:

Two-dimensional (2D) monolayer MoSi2N4 has attracted wide attention due to its excellent carrier transport capacity and chemical stability. However, the relationship between its photoelectric properties and applied plane strain has not been thoroughly explored. The effect of plane strain on band structures and photoelectric properties of 2D monolayer MoSi2N4 is revealed by the plane-wave ultrasoft pseudopotentials. The results show that the monolayer MoSi2N4 is an indirect band gap semiconductor. Its top of valance band is dominated by Mo4d orbitals and partly contributed by N2p orbitals, while its bottom of conduction band is mainly contributed by Mo4d orbitals. Under tensile strain, band gap of monolayer MoSi2N4 narrows gradually and effective mass of photogenerated carriers decreases continuously. Under compressive strain, the band gap widens gradually and the effective mass increases slowly. It is worth noting that a compressive strain (ε=-2.8%) results in transition form indirect to direct band gap. Optical absorption of monolayer MoSi2N4 exhibits obvious anisotropy, which edge shifts in different degree under the plane strain, effectively expanding the spectral response range of the system and beneficial to the photoelectric properties. These results provide a theoretical guidance for further research on the application of 2D monolayer MoSi2N4 in the field of new tunable nano optoelectronic devices.

Key words: two-dimensional material, plane strain, photoelectric property, first-principles, band structure

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