高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (8): 20230145.doi: 10.7503/cjcu20230145

• 物理化学 • 上一篇    下一篇

直接Z型In2SSe/Sb范德华异质结光催化水分解的第一性原理研究

曹圣哲1, 黄欣2(), 杨志红2   

  1. 1.南京邮电大学电子与光学工程学院,柔性电子(未来技术)学院
    2.理学院,南京 210023
  • 收稿日期:2023-03-29 出版日期:2023-08-10 发布日期:2023-05-16
  • 通讯作者: 黄欣 E-mail:xhuang@njupt.edu.cn
  • 基金资助:
    国家自然科学基金(11804165)

First-principles Study of Direct Z-scheme In2SSe/Sb Heterostructure as Photocatalyst for Water Splitting

CAO Shengzhe1, HUANG Xin2(), YANG Zhihong2   

  1. 1.College of Electronic and Optical Engineering,College of Flexible Electronics(Future Technology)
    2.College of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China
  • Received:2023-03-29 Online:2023-08-10 Published:2023-05-16
  • Contact: HUANG Xin E-mail:xhuang@njupt.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(11804165)

摘要:

采用第一性原理方法研究了In2SSe/Sb范德华异质结的光催化性质. 计算结果表明, In2SSe/Sb异质结是直接带隙半导体, 带隙为0.82 eV, 其能带结构呈交错型排列, 在异质结界面处会形成由Sb指向In2SSe的内置电场, 构成Z型异质结结构, 有利于电子-空穴对的有效分离. 异质结的带边位置跨越水的氧化还原电位并表现出从红光到紫外光的强光吸收. 该研究结果为基于In2SSe/Sb异质结的设计提供了理论参考.

关键词: In2SSe/Sb, 范德华异质结, 第一性原理, 光催化

Abstract:

The photocatalytic properties of two-dimensional In2SSe/Sb van der Waals heterostructure were investi-gated via first-principles method. The results show that In2SSe/Sb heterostructure possesses the staggered band alignments with a direct band gap of 0.82 eV. As the built-in electric field is pointing from Sb to In2SSe at the interface, the In2SSe/Sb heterostructure exhibits type-Z mode, which is beneficial for effective electron-holes separations. Moreover, its band edges straddle water redox potentials and a strong optical absorption spectrum from visible light to ultraviolet light is obtained. Our study would offer theoretical understanding for designing In2SSe/Sb van der Waals heterostructure.

Key words: In2SSe/Sb, van der Waals heterostructure, First-principle, Photocatalysis

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