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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (6): 940-948.DOI: 10.16553/j.cnki.issn1000-985x.xb2026.0024

• 研究论文 • 上一篇    下一篇

基于第一性原理计算的金属掺杂β-Ga2O3光催化研究

张野(), 杨凤蝶, 刘岚萱, 张奇妙, 姚明远, 王超凡, 苗瑞霞(), 侯银龙()   

  1. 西安邮电大学电子工程学院,西安 710121
  • 收稿日期:2026-02-10 出版日期:2026-06-20 发布日期:2026-07-07
  • 通信作者: 苗瑞霞,博士,副教授。E-mail:miao9508301@163.com
    侯银龙,博士,副教授。E-mail:houyinlong@xupt.edu.cn
  • 作者简介:张野(2004—),男,陕西省人。E-mail:3156566865@qq.com
  • 基金资助:
    国家自然科学基金(62405245)

First-Principles Calculation Study on Metal-Doped β -Ga2O3 for Photocatalysis

ZHANG Ye(), YANG Fengdie, LIU Lanxuan, ZHANG Qimiao, YAO Mingyuan, WANG Chaofan, MIAO Ruixia(), HOU Yinlong()   

  1. School of Electronic Engineering,Xi’an University of Posts & Telecommunications,Xi’an 710121,China
  • Received:2026-02-10 Online:2026-06-20 Published:2026-07-07

摘要: 针对β-Ga2O3在光催化中因载流子复合率高及宽带隙引起的响应光谱窄的问题,本研究通过第一性原理计算探究了金属Zn、Cd、Hg掺杂对β-Ga2O3电子结构、光学性质及催化稳定性的影响机制。结果表明,三种金属掺杂体系均满足光催化水解的能级匹配条件,其中Zn掺杂体系的电子-空穴相对有效质量比(me*/mh*)高于Cd、Hg掺杂体系,更利于光生载流子的空间分离与迁移。形成能计算显示,在富氧环境下Zn掺杂优先占据Ga(1)晶格位点,其形成能远低于Cd与Hg掺杂体系,表明Zn掺杂β-Ga2O3具有最优的结构稳定性。光吸收谱分析表明,材料光吸收能力呈现各向异性,其中在[001]晶向上光吸收系数明显高于[100]和[010]晶向。Zn、Cd、Hg掺杂大幅提高了β-Ga2O3在红外区的光吸收能力。综上,三种金属掺杂中,Zn掺杂可作为首选杂质,该结果为高效光催化剂设计提供了理论参考。

关键词: 第一性原理; β-Ga2O3; 金属掺杂; 光催化; 光吸收系数; 半导体材料

Abstract: Aiming at the problem of narrow response spectrum of β-Ga2O3 in photocatalysis caused by high carrier recombination rate and wide band gap,the influence mechanisms of metal Zn,Cd,and Hg doping on the electronic structure,optical properties,and catalytic stability of β-Ga2O3 were investigated via first-principles calculation in this study. The results show that all three metal-doped systems all meet the energy level matching conditions for photocatalytic water splitting. Among them,the electron-hole relative effective mass ratio (me*/mh*) of the Zn-doped system is higher than those of the Cd- and Hg-doped systems,which is more conducive to the spatial separation and migration of photogenerated carriers. Formation energy calculations show that Zn doping preferentially occupies Ga(1) lattice sites under oxygen-rich conditions,and its formation energy is much lower than those of Cd- and Hg-doped systems,indicating that Zn-doped β-Ga2O3 has the optimal structural stability. Optical absorption spectrum analysis shows that the optical absorption capacity of the material presents anisotropy,and the optical absorption coefficient along the [001] crystal direction is significantly higher than those along the [100] and [010] directions. Zn,Cd,and Hg doping greatly improve the optical absorption capacity of β-Ga2O3 in the infrared region. In summary,among the three metal doping,Zn doping can be used as the preferred impurity. This result provides a theoretical reference for the design of high-efficiency photocatalysts.

Key words: first-principle; β-Ga2O3; metal doping; photocatalysis; optical absorption coefficient; semiconductor material

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