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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (1): 128-141.DOI: 10.16553/j.cnki.issn1000-985x.2025.0185

• 研究论文 • 上一篇    下一篇

剪切应变对Mn掺杂MoS2电子结构和光学性质影响的理论研究

孔家栩(), 林雪玲(), 潘凤春   

  1. 宁夏大学物理学院,银川 750021
  • 收稿日期:2025-08-25 出版日期:2026-01-20 发布日期:2026-02-05
  • 通信作者: 林雪玲
  • 作者简介:孔家栩(2002—),男,山东省人。E-mail:nxukjx@163.com
  • 基金资助:
    宁夏自然科学基金(2024AAC03012);宁夏大学自治区级创新训练项目(S202510749045)

Theoretical Study on Influence of Shear Strain on Electronic Structure and Optical Properties of Mn Doped MoS2

KONG Jiaxu(), LIN Xueling(), PAN Fengchun   

  1. School of Physics,Ningxia University,Yinchuan 750021,China
  • Received:2025-08-25 Online:2026-01-20 Published:2026-02-05
  • Contact: LIN Xueling

摘要: 本文运用基于密度泛函理论的CASTEP软件,研究了Mn掺杂单层MoS2体系的晶体结构、电子结构和光学性质,并系统研究了剪切应变对(Mo,Mn)S2体系电子结构和光学性质的调控规律。结果表明,Mn掺杂MoS2形成的替代缺陷中,MnMo缺陷的形成能最小。MnMo缺陷的引入降低了MoS2的禁带宽度,提高了掺杂体系对可见光区和红外光区光子的吸收能力。由于MnMo诱导的杂质能级的出现,掺杂体系光学吸收谱的吸收边落在红外光区;当施加剪切应变后,掺杂体系的禁带宽度发生变化,从而影响了掺杂体系的光学性质。不同剪切应变下掺杂体系的禁带宽度与晶场劈裂能的大小有关,-4%剪切应变下,Mn原子周围6个S原子形成的三棱柱晶场对Mn-3d电子的作用较小,此时掺杂体系的禁带宽度为0.42 eV,价带顶电子跃迁到导带底对所需要吸收光子的能量最小;-4%剪切应变体系对红外光区光子的吸收能力提升最好,吸收幅度最大;剪切应变的施加,对掺杂体系的复介电函数和反射系数均有影响,施加负剪切应变,有利于掺杂体系复介电函数在低能光区数值的提升,提高掺杂体系中价电子的跃迁概率和光生电子空穴对的分离概率,使掺杂体系的光催化性能得到很大的改善;此外,掺杂体系的光学性质也与MnMo缺陷的掺杂浓度有关,-4%剪切应变下,均匀掺杂4个MnMo的体系在可见光区和红外光区的光学吸收幅度最大,此时对应的MnMo掺杂摩尔分数为5.3%。本文的研究结果可为MoS2在光学领域的应用提供一种新途径。

关键词: MoS2; Mn掺杂; 剪切应变; 光学性能; 第一性原理计算

Abstract: Performed the CASTEP code based on the density functional theory (DFT),the crystal structures,electronic structures and optical properties of Mn doped monolayer MoS2 werestudied in this paper,the regulation of shear strain on electronic structures and optical properties of (Mo, Mn)S2 systems were systematically investigated. The results show that the formation energy of MnMo defect is the smallest for substituted defects in Mn doped MoS2. The introduction of MnMo defect reduces the band gap MoS2 and improves the absorption ability of doped system for visible and infrared photons. Because of the appearance of impurity energy levels induced by MnMo,the absorption edge of optical absorption spectrum of doped system falls in the infrared region. When the shear strain is applied, the band gap of the doped system changes, which affect the optical properties of Mn doped MoS2 system. The band gap of doped system under different shear strains is related to the magnitude of crystal field splitting energy. Under the shear strain of -4%,the triangular prism crystal field formed by the six S atoms around Mn atom has a relatively small effect on Mn-3d electrons,and the band gap of Mn doped MoS2 system is 0.42 eV,which means the energy required to absorb photons for the valence band top electrons to transition to the conduction band bottom pairs is the smallest. The Mn doped MoS2 system under shear strain shows the best improvement in the absorption ability of photons in the infrared region with the maximum absorption amplitude.The application of shear strain has an effect on the complex dielectric function and reflection coefficient of the doped system. The application of negative shear strain is beneficial to improve the complex dielectric function of doped system in the low-energy region,promote the transition probability of valence electrons and the separation of photogenerated electron hole pairs in doped system,which result in significant improvement in the photocatalytic performance of doped system. Moreover,the optical properties of doped system are also related to the doping concentration of MnMo defects. Under the shear strain of -4%,the optical absorption amplitude of the system uniformly doped with four MnMo is the largest in the visible and infrared light regions, and the corresponding MnMo doping mole fraction is 5.3%. This results provide a new approach for the application of MoS2 in the field of optics.

Key words: MoS2; Mn doping; shear strain; optical property; first-principles calculation

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