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人工晶体学报 ›› 2022, Vol. 51 ›› Issue (1): 56-64.

• 研究论文 • 上一篇    下一篇

Mg, N掺杂β-Ga2O3光电性质的第一性原理计算

任姗姗1, 付小倩1,2, 赵贺1, 王洪刚3   

  1. 1.济南大学信息科学与工程学院,济南 250022;
    2.山东省网络环境智能计算技术重点实验室,济南 250022;
    3.鲁东大学信息与电气工程学院,烟台 264025
  • 收稿日期:2021-05-22 出版日期:2022-01-15 发布日期:2022-02-09

First-Principle Study on Photoelectric Properties of Mg, N Doped β-Ga2O3

REN Shanshan1, FU Xiaoqian1,2, ZHAO He1, WANG Honggang3   

  1. 1. School of Information Science and Engineering, University of Jinan, Jinan 250022, China;
    2. Shandong Provincial Key Laboratory of Network Based Intelligent Computing, Jinan 250022, China;
    3. School of Information and Electrical Engineering, Ludong University, Yantai 264025, China
  • Received:2021-05-22 Online:2022-01-15 Published:2022-02-09
  • Contact: FU Xiaoqian, doctor, assistant professor. E-mail: ise_fuxq@ujn.edu.cn
  • About author:REN Shanshan(1997—), female, from Shandong Province, postgraduate. E-mail: 2015441680@qq.com
  • Supported by:
    National Natural Science Foundation of China(61601198); China Scholarship Council(CSC201908370113); Shandong Provincial Natural Science Foundation(ZR2019MF010); Doctoral Foundation of University of Jinan(XBS1714)

摘要: 通过基于密度泛函理论的第一性原理计算,研究了Mg单掺杂、N单掺杂和不同浓度的Mg-N共掺杂β-Ga2O3的结构性质、电子性质和光学性质,以期获得性能比较优异的p型β-Ga2O3材料。建立了五种模型:Mg单掺杂、N单掺杂、1个Mg-N共掺杂、2个Mg-N共掺杂和3个Mg-N共掺杂β-Ga2O3。经过计算,3个Mg-N共掺杂β-Ga2O3体系的结构最稳定。此外,在5种模型中,3个Mg-N共掺杂β-Ga2O3体系的禁带宽度是最小的,并且N 2p和Mg 3s贡献的占据态抑制了氧空位的形成,从而增加了空穴浓度。因此,3个Mg-N共掺杂β-Ga2O3体系表现出优异的p型性质。3个Mg-N共掺杂体系的吸收峰出现明显红移,在太阳盲区的光吸收系数较大,这归因于导带Ga 4s、Ga 4p、Mg 3s向价带O 2p、N 2p的带间电子跃迁。本工作将为p型β-Ga2O3日盲光电材料的研究和应用提供理论指导。

关键词: β-Ga2O3, 掺杂, p型掺杂, 结构性质, 电子性质, 光学性质, 第一性原理

Abstract: The structural, electronic and optical properties of Mg single doped, N single doped and different concentrations Mg-N co-doped β-Ga2O3 were studied via the first-principles calculation based on density function theory. This work aims to improve the effect of p-type β-Ga2O3doping. Five models were built including Mg single doped, N-single doped, 1 Mg-N doped, 2 Mg-N doped and 3 Mg-N doped β-Ga2O3. Among them, the model of 3 Mg-N doped β-Ga2O3 shows the most stable structure than other doped systems. In attention to, the bandgap of 3 Mg-N doped β-Ga2O3 material is the smallest. And occupied states contributed by N 2p and Mg 3s inhibit the formation of oxygen vacancies, which increases the concentration of holes. Thus, 3 Mg-N doped β-Ga2O3 system displays excellent p-type feature. Adsorption peak is obvious red-shift in 3 Mg-N doped system, and the adsorption coefficient is bigger at solar-blind region, which is ascribed to the interband electron transition from the Ga 4s, Ga 4p, Mg 3s of conduct band to O 2p, N 2p of valence band. This work will provide a theoretical guide for the study and application of p-type β-Ga2O3 materials.

Key words: β-Ga2O3, doping, p-type doping, structural property, electronic property, optical property, first-principle

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