
人工晶体学报 ›› 2026, Vol. 55 ›› Issue (8): 1297-1305.DOI: 10.16553/j.cnki.issn1000-985x.2026.0045
涂敏锐(
), 谢泉(
), 杨倩, 黄思丽, 喻刚元, 林必康
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:
TU Minrui(
), XIE Quan(
), YANG Qian, HUANG Sili, YU Gangyuan, LIN Bikang
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。
中图分类号:
涂敏锐, 谢泉, 杨倩, 黄思丽, 喻刚元, 林必康. Be2C/WSi2N4异质结构电子结构和光学性质的第一性原理研究[J]. 人工晶体学报, 2026, 55(8): 1297-1305.
TU Minrui, XIE Quan, YANG Qian, HUANG Sili, YU Gangyuan, LIN Bikang. First-Principles Study on Electronic Structure and Optical Properties of Be2C/WSi2N4 Heterostructure[J]. Journal of Synthetic Crystals, 2026, 55(8): 1297-1305.
| Model | a(=b)/Å | d/Å | Eb/(meV·Å-2) |
|---|---|---|---|
| A | 5.84 | 2.751 | -6.225 |
| B | 5.84 | 2.763 | -5.673 |
| C | 5.84 | 2.029 | -4.263 |
| D | 5.86 | 1.873 | -3.485 |
| E | 5.86 | 1.880 | -5.198 |
| F | 5.86 | 1.884 | -5.062 |
表1 Be2C/WSi2N4异质结构的六种堆垛模型的晶格常数(a、b)、层间距(d)和结合能(Eb)
Table 1 Lattice constants (a, b), interlayer distance (d) and binding energy (Eb) for six stacking models of Be2C/WSi2N4 heterostructure
| Model | a(=b)/Å | d/Å | Eb/(meV·Å-2) |
|---|---|---|---|
| A | 5.84 | 2.751 | -6.225 |
| B | 5.84 | 2.763 | -5.673 |
| C | 5.84 | 2.029 | -4.263 |
| D | 5.86 | 1.873 | -3.485 |
| E | 5.86 | 1.880 | -5.198 |
| F | 5.86 | 1.884 | -5.062 |
图4 Be2C/WSi2N4异质结构的声子色散谱(a)和Be2C/WSi2N4异质结构在300 K下AIMD经过12 ps模拟得到的能量与温度波动曲线(b)
Fig.4 Phonon dispersion spectra of Be2C/WSi2N4 heterostructure (a) and energy and temperature fluctuation curves obtained from AIMD simulation of Be2C/WSi2N4 heterostructure at 300 K for 12 ps (b)
图5 Be2C/WSi2N4异质结构的电子结构特性。(a)投影能带结构;(b)分态密度和总态密度;(c)平面平均静电势;(d)平面平均差分电荷密度
Fig.5 Electronic structure properties of Be2C/WSi2N4 heterostructure. (a) Projected band structure; (b) partial density of states and total density of states; (c) planar-averaged electrostatic potential; (d) planar-averaged charge density difference
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