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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (8): 1297-1305.DOI: 10.16553/j.cnki.issn1000-985x.2026.0045

• 研究论文 • 上一篇    下一篇

Be2C/WSi2N4异质结构电子结构和光学性质的第一性原理研究

涂敏锐(), 谢泉(), 杨倩, 黄思丽, 喻刚元, 林必康   

  1. 贵州大学大数据与信息工程学院,贵阳 550025
  • 收稿日期:2026-03-19 出版日期:2026-08-20 发布日期:2026-08-26
  • 通信作者: 谢 泉,博士,教授。E-mail:qxie@gzu.edu.cn
  • 作者简介:涂敏锐(1999—),女,贵州省人,硕士研究生。E-mail:1098627216@qq.com
  • 基金资助:
    国家自然科学基金联合基金(U24A20246);贵州大学智能制造产教融合创新平台及研究生联合培养基地(2020-520000-83-01-324061);贵州省智慧化服务工程研究中心(2203-520102-04-04-298868);贵阳市科技平台建设项目(筑科合同〔2023〕7-3)

First-Principles Study on Electronic Structure and Optical Properties of Be2C/WSi2N4 Heterostructure

TU Minrui(), XIE Quan(), YANG Qian, HUANG Sili, YU Gangyuan, LIN Bikang   

  1. College of Big Data and Information Engineering,Guizhou University,Guiyang 550025,China
  • Received:2026-03-19 Online:2026-08-20 Published:2026-08-26

摘要: 为了揭示Be2C/WSi2N4异质结构的微观界面机制及其对外部应变的响应规律,进而为新型可调谐光电子器件设计提供理论支撑,本文采用基于密度泛函理论的第一性原理计算,对Be2C/WSi2N4异质结构的电子结构、光学性质及双轴应变调控效应进行了系统研究。结果表明,与单层材料相比,Be2C/WSi2N4异质结构呈现出典型的Ⅱ型能带排列,并在界面处形成由Be2C指向WSi2N4的内建电场,有效促进了光生载流子的空间分离。光学性质计算结果表明,异质结构的光吸收能力显著优于单层材料,吸收系数峰值达22.0×105 cm-1。在施加-4%~+4%双轴应变时,拉伸应变使带隙减小、吸收谱红移,而压缩应变则导致带隙增大、吸收谱蓝移,应变对能带类型的转变也产生显著影响。本研究为以Be2C/WSi2N4为代表的二维异质结构在可调谐光电子器件中的应用提供了理论依据。

关键词: Be2C/WSi2N4; 异质结构; 第一性原理; 电子结构; 光学性质; 应变调控

Abstract: In order to reveal the microscopic interface mechanism of Be2C/WSi2N4 heterostructure and its response to external strain, and further to provide theoretical support for the design of novel tunable optoelectronic devices, this paper systematically investigated the electronic structure, optical properties and biaxial strain modulation effects of Be2C/WSi2N4 heterostructure by employing first-principles calculations based on density functional theory. The results indicate that compared with monolayer materials, the Be2C/WSi2N4 heterostructure exhibits a typical type-Ⅱ band alignment, and a built-in electric field pointing from Be2C to WSi2N4 is formed at the interface, which effectively promotes the spatial separation of photogenerated carriers. The calculated results of optical properties demonstrate that the heterostructure possesses a remarkably enhanced light absorption capacity in contrast with monolayer materials, and its maximum absorption coefficient reaches 22.0×105 cm-1. Within the biaxial strain range from -4% to +4%, the tensile strain reduces the band gap and induces a red shift of the absorption spectrum, while the compressive strain increases the band gap and leads to a blue shift of the absorption spectrum. In addition, the strain exerts a prominent effect on the transition of band gap types. This research offers a theoretical basis for the application of two-dimensional heterostructures represented by Be2C/WSi2N4 in tunable optoelectronic devices.

Key words: Be2C/WSi2N4; heterostructure; first-principle; electronic structure; optical property; strain modulation

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