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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (5): 825-831.DOI: 10.16553/j.cnki.issn1000-985x.2024.0291

• 研究论文 • 上一篇    下一篇

二维BC6N/BN横向异质结的电学输运性质研究

解忧(), 肖潇飒, 姜宁宁, 张涛   

  1. 西安科技大学理学院,西安 710054
  • 收稿日期:2024-11-21 出版日期:2025-05-15 发布日期:2025-05-28
  • 作者简介:解忧(1977—),男,安徽省人,博士,教授。E-mail:xieyou@xust.edu.cn
  • 基金资助:
    国家自然科学基金(52474252);国家自然科学基金(12474468);陕西省自然科学基金(2023JCYB014);陕西省自然科学基金(2025JC-YBMS-065)

Electrical Transport Properties of Two-Dimensional BC6N/BN Lateral Heterostructure

XIE You(), XIAO Xiaosa, JIANG Ningning, ZHANG Tao   

  1. College of Sciences,Xi’an University of Science and Technology,Xi’an 710054,China
  • Received:2024-11-21 Online:2025-05-15 Published:2025-05-28

摘要: 二维异质结具有新颖的物理和化学性质,在纳米电子器件中具有重要应用前景。本文构建了一种新型BC6N/BN横向异质结,基于第一性原理结合非平衡态格林函数方法,对其结构稳定性、电子结构、电导率及伏安特性进行了系统研究。稳定的BC6N/BN横向异质结拥有2.01 eV的直接带隙,异质结界面处产生静电势差,电子与空穴在界面形成了电势垒。相较于两个单层材料,BC6N/BN横向异质结的电导率显著降低,并展现出强烈的各向异性。伏安特性显示:异质结在0~2.5 V的电压范围内几乎不产生电流;正向电压超过3 V后电流呈现线性增长趋势;反向电压从3 V增加到5.5 V的过程中仅有微弱电流,超过5.5 V时电流呈非线性增长。因此,BC6N/BN横向异质结具有各向异性的电导率与单向导通特性,该研究为纳米电子器件的设计和制备提供重要理论基础。

关键词: 横向异质结; BC6N/BN; 电学输运性质; 电子结构; 第一性原理

Abstract: The two-dimensional heterostructures have outstanding physical and chemical properties that make them promising applications in nanoelectronic devices. A novel BC6N/BN lateral heterostructure was constructed, and the structural stability, electronic structure, conductivity and volt-ampere characteristics of BC6N/BN lateral heterostructure were investigated by the first-principles combined with the non-equilibrium Green's function. The BC6N/BN lateral heterostructure not only exhibits dynamic stability but also possesses a direct bandgap of 2.01 eV, static potential difference generated at heterojunction interface, electrons and holes form an electrical barrier at the interface. Compared to the BC6N and BN monolayers, the conductivity of BC6N/BN lateral heterostructure is significantly reduced and exhibits strong anisotropy. The volt-ampere characteristics of the BC6N/BN lateral heterostructure show that almost no current is generated in the voltage range of 0 to 2.5 V. After the forward voltage exceeds 3 V, the current shows a linear increase trend; during the process of increasing the reverse voltage from 3 V to 5.5 V, there is only a weak current. When the reverse voltage exceeds 5.5 V, the current increases nonlinearly. Therefore, the BC6N/BN lateral heterostructure has anisotropic conductivity and unidirectional conductivity characteristics, which can provide the important theoretical basis for the design and preparation of nanoelectronics devices.

Key words: lateral heterostructure; BC6N/BN; electrical transport property; electronic structure; first-principle

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