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人工晶体学报 ›› 2026, Vol. 55 ›› Issue (8): 1266-1273.DOI: 10.16553/j.cnki.issn1000-985x.2026.0065

• 研究论文 • 上一篇    下一篇

沟槽终端Ga2O3/金刚石异质结二极管电学特性仿真研究

孙丛珊1(), 胡继超1,2(), 董林鹏1,2, 彭博2,3, 苏汉1   

  1. 1.西安理工大学自动化与信息工程学院,西安 710048
    2.镓创未来半导体科技(晋江)有限公司,泉州 362200
    3.西安电子科技大学集成电路学部,西安 710071
  • 收稿日期:2026-04-16 出版日期:2026-08-20 发布日期:2026-08-26
  • 通信作者: 胡继超,博士,教授。E-mail:jchu@xaut.edu.cn
  • 作者简介:孙丛珊(2002—),女,陕西省人,硕士研究生。E-mail:sun2240320047@163.com
  • 基金资助:
    国家自然科学基金(62474139)

Simulation Study on Electrical Characteristics of a Trench Terminated Ga2O3/Diamond Heterojunction Diode

SUN Congshan1(), HU Jichao1,2(), DONG Linpeng1,2, PENG Bo2,3, SU Han1   

  1. 1.School of Automation and Information Engineering,Xi’ an University of Technology,Xi’ an 710048,China
    2.JiaChuangWeiLai Semiconductor Technology (Jinjiang) Co. ,Ltd. ,Quanzhou 362200,China
    3.Department of Integrated Circuits,Xidian University,Xi’an 710071,China
  • Received:2026-04-16 Online:2026-08-20 Published:2026-08-26

摘要: 氧化镓(Ga2O3)因宽禁带、高击穿场强等优异特性而受到广泛关注。然而,Ga2O3本征热导率低及缺乏有效p型掺杂的短板限制了其在功率器件中的应用。将Ga2O3与高热导率的p型半导体材料异质集成,被认为是解决上述问题的有效方案之一。金刚石材料具有极高的热导率,并且可以实现可控的p型掺杂,可用于与n型Ga2O3构建异质结器件,从而弥补Ga2O3的不足。为提高Ga2O3/金刚石异质结二极管的击穿特性,本文提出在Ga2O3/金刚石异质结中引入沟槽终端结构,以期通过改善电场集中提升器件击穿电压。并利用Sentaurus TCAD仿真工具,系统研究沟槽宽度、深度及填充介质对器件击穿电压的影响规律。仿真结果表明:增大沟槽宽度可显著提升击穿电压,从347.8 V提高至1 197.85 V,增幅达244.4%;随着沟槽深度增加,击穿电压进一步提升至1 334.51 V。在填充介质方面,对比空气、二氧化硅(SiO2)、氧化铝(Al2O3)和二氧化铪(HfO2)四种材料,SiO2凭借稳定的电学特性及对击穿电压的显著提升效果,成为最佳介质选择。本文为Ga2O3/金刚石器件的结构设计与性能优化提供了理论依据。

关键词: Ga2O3; 金刚石; 异质结二极管; 击穿电压; 沟槽终端; 电场集中

Abstract: Gallium oxide (Ga2O3) has attracted widespread attention due to its excellent properties such as wide bandgap and high breakdown field strength. However, the application of Ga2O3 in power devices is limited by its low intrinsic thermal conductivity and the lack of effective p-type doping. It is heterogeneously integrated with p-type semiconductor materials with high thermal conductivity, which is considered to be one of the effective solutions to solve the problem of Ga2O3. Diamond materials have extremely high thermal conductivity and can achieve controlled p-type doping, and it can be used to construct heterojunction devices with n-type Ga2O3, by which the shortcomings of Ga2O3 are compensated. In order to improve the breakdown characteristics of Ga2O3/diamond heterojunction diodes, a groove terminal structure is proposed to introduce a trench terminal structure into Ga2O3/diamond heterojunction, in order to increase the breakdown voltage of the device by improving the electric field. Systematic simulations were conducted using Sentaurus TCAD to evaluate the effects of trench width, depth, and filling dielectric on breakdown voltage. The results show that increasing the trench width significantly raises the breakdown voltage from 347.8 V to 1 197.85 V, an increase of 244.4%. A further increase in trench depth enhances the voltage to 1 334.51 V. In terms of filling media, compared with air, silica (SiO2), alumina (Al2O3) and hafnium dioxide (HfO2), SiO2 has become the optimal medium choice due to its stable electrical characteristics and significant improvement effect on breakdown voltage. This study offers theoretical guidance for the design and optimization of Ga2O3/diamond devices.

Key words: Ga2O3; diamond; heterojunction diode; breakdown voltage; trench termination; electric field crowding

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