
人工晶体学报 ›› 2026, Vol. 55 ›› Issue (5): 772-781.DOI: 10.16553/j.cnki.issn1000-985x.2026.0007
李子唯1,2(
), 余建刚1,2(
), 刘晋花2,3, 李腾腾1,2, 杨晓利4, 雷程1,2, 梁庭1,2
收稿日期:2026-01-13
出版日期:2026-05-20
发布日期:2026-06-09
通信作者:
余建刚,博士,副教授。E-mail:yujg@nuc.edu.cn作者简介:李子唯(2000—),女,内蒙古自治区人,硕士研究生。E-mail:lzw14710@163.com
基金资助:
LI Ziwei1,2(
), YU Jiangang1,2(
), LIU Jinhua2,3, LI Tengteng1,2, YANG Xiaoli4, LEI Cheng1,2, LIANG Ting1,2
Received:2026-01-13
Online:2026-05-20
Published:2026-06-09
摘要: 氧化镓(β-Ga2O3)功率器件因具有高耐压、低损耗及低成本的优势,已成为当前研究的热点,但受限其P型有效掺杂困难,基于β-Ga2O3的同质结器件研究受阻,而异质结终端器件仍存在导通电阻大、击穿电压低等电学特性不能满足实际应用需求的问题。针对以上问题,本文创新性提出了一种由NiO组成的场限环与浮空场板组成的复合终端增强型横向NiO/β-Ga2O3异质结场效应晶体管(HJFET)。通过TCAD软件重点研究了浮空场板长度及场限环长度、厚度对器件击穿特性的影响。结果表明:场限环与浮空场板组合可以有效缓解栅极边缘电场集中效应,同时高介电常数介质HfO2可将异质结边缘电场调控至β-Ga2O3沟道内,最终器件实现了2 537 V的高击穿电压。对于具有浮空场板的器件获得了导通电阻为14.21 mΩ·cm2,击穿电压为2 358 V,PFOM达到391.285 MW·cm-2的优异性能。本研究的设计为大功率高耐压β-Ga2O3功率器件的设计和优化提供了新的思路。
中图分类号:
李子唯, 余建刚, 刘晋花, 李腾腾, 杨晓利, 雷程, 梁庭. 新型复合终端结构横向 β -Ga2O3场效应晶体管电学特性仿真研究[J]. 人工晶体学报, 2026, 55(5): 772-781.
LI Ziwei, YU Jiangang, LIU Jinhua, LI Tengteng, YANG Xiaoli, LEI Cheng, LIANG Ting. Simulation Study on Electrical Characteristics of New Composite Terminal Structure Lateral β -Ga2O3 Field-Effect Transistors[J]. Journal of Synthetic Crystals, 2026, 55(5): 772-781.
| Parameter | β-Ga2O3 |
|---|---|
| Band gap,Eg/eV | 4.8 |
| Electron mobility,μ/(cm2·V-1·s-1) | 300 |
| Dielectric constant,κs | 10.2 |
| Electron affinity,χ/eV | 4.0 |
| Valence band state density,Nv/cm-3 | 3.72×1018 |
| Conduction band state density,NC/cm-3 | 3.72×1018 |
| Effective electronic mass,m0 | 0.28 |
| Breakdown field strength,Ec/(MV·cm-1) | 8 |
表1 β -Ga2O3仿真材料参数
Table 1 Simulation material parameters of β -Ga2O3
| Parameter | β-Ga2O3 |
|---|---|
| Band gap,Eg/eV | 4.8 |
| Electron mobility,μ/(cm2·V-1·s-1) | 300 |
| Dielectric constant,κs | 10.2 |
| Electron affinity,χ/eV | 4.0 |
| Valence band state density,Nv/cm-3 | 3.72×1018 |
| Conduction band state density,NC/cm-3 | 3.72×1018 |
| Effective electronic mass,m0 | 0.28 |
| Breakdown field strength,Ec/(MV·cm-1) | 8 |
| Parameter | NiO |
|---|---|
| Band gap,Eg/eV | 3.7 |
| Hole mobility,μ/(cm2·V-1·s-1) | 0.24 |
| Dielectric constant,κs | 11.8 |
| Electron affinity,χ/eV | 1.8 |
| Effective electronic mass,m0 | 6 |
| Breakdown field strength,Ec/(MV·cm-1) | 4.8~6.2 |
表2 NiO仿真材料参数
Table 2 Simulation material parameters of NiO
| Parameter | NiO |
|---|---|
| Band gap,Eg/eV | 3.7 |
| Hole mobility,μ/(cm2·V-1·s-1) | 0.24 |
| Dielectric constant,κs | 11.8 |
| Electron affinity,χ/eV | 1.8 |
| Effective electronic mass,m0 | 6 |
| Breakdown field strength,Ec/(MV·cm-1) | 4.8~6.2 |
| Parameter | Value |
|---|---|
| a/cm-1 | 7.06×105 |
| b/(V·cm-1) | 2.1×107 |
| c | 0 |
| d | 0 |
| 0.063 |
表3 β -Ga2O3雪崩电离拟合参数
Table 3 Avalanche ionization fitting parameters of β -Ga2O3
| Parameter | Value |
|---|---|
| a/cm-1 | 7.06×105 |
| b/(V·cm-1) | 2.1×107 |
| c | 0 |
| d | 0 |
| 0.063 |
图6 TFP、LFP对器件击穿特性影响。(a)不同TFP器件击穿特性曲线;(b)不同LFP器件击穿特性曲线;(c)不同LFP器件电场峰值沿P3、P4处切线分布图;(d)不同LFP器件电场分布图
Fig.6 Effects ofTFP andLFP on device breakdown characteristics. (a) Breakdown characteristic curves of differentTFP devices; (b) breakdown characteristic curves of differentLFP devices; (c) tangential distribution of electric field peak at P3 and P4 of differentLFP devices; (d) electric field distribution of differentLFP devices
图7 集成浮空场板与场限环复合终端的横向β-Ga2O3 HJFET横截面示意图
Fig.7 Cross-section schematic diagram of a lateralβ-Ga2O3 HJFET with integrated floating field plate and field-limiting ring composite terminal
图9 LFLR及TFLR对器件击穿特性影响。(a)不同LFLR器件击穿特性曲线;(b)不同TFLR器件击穿特性曲线;(c)不同LFP器件电场峰值沿P3、P4处切线分布图;(d)不同LFP器件PFOM对比
Fig.9 Effects ofLFLR and TFLR on device breakdown characteristics. (a) Breakdown characteristic curves of differentLFLR devices; (b) breakdown characteristic curves of differentTFLR devices; (c) tangential distribution of electric field peak at P3 and P4 of differentTFLR devices; (d) comparison of PFOM of differentLFP devices
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