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Chin. Phys. B, 2020, Vol. 29(12): 127701    DOI: 10.1088/1674-1056/abaee5
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

A novel high breakdown voltage and high switching speed GaN HEMT with p-GaN gate and hybrid AlGaN buffer layer for power electronics applications

Yong Liu(刘勇), Qi Yu(于奇), and Jiang-Feng Du(杜江锋)†
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
Abstract  A novel p-GaN gate GaN high-electron-mobility transistor (HEMT) with an AlGaN buffer layer and hybrid dielectric zone (H-HEMT) is proposed. The hybrid dielectric zone is located in the buffer and composed of horizontal arranged HfO2 zone and SiNx zone. The proposed H-HEMT is numerically simulated and optimized by the Silvaco TCAD tools (ATLAS), and the DC, breakdown, C-V and switching properties of the proposed device are characterized. The breakdown voltage of the proposed HEMT is significantly improved with the introduction of the hybrid dielectric zone, which can effectively modulate the electric field distribution in the GaN channel and the buffer. High breakdown voltage of 1490 V, low specific on-state resistance of 0.45 mΩ cm2 and high Baliga's figure of merit (FOM) of 5.3 GW/cm2, small R onQ oss of 212 mΩ nC, high turn-on speed 627 V/ns and high turn-off speed 87 V/ns are obtained at the same time with the gate-to-drain distance L gd of 6 μ m.
Keywords:  GaN HEMT      breakdown voltage      high-permittivity dielectric      low-permittivity dielectric  
Received:  11 June 2020      Revised:  21 July 2020      Published:  13 November 2020
PACS:  73.40.Kp (III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)  
  73.61.Ey (III-V semiconductors)  
  78.30.Fs (III-V and II-VI semiconductors)  
  77.22.Ch (Permittivity (dielectric function))  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61376078).
Corresponding Authors:  Corresponding author. E-mail: jfdu@uestc.edu.cn   

Cite this article: 

Yong Liu(刘勇), Qi Yu(于奇), and Jiang-Feng Du(杜江锋) A novel high breakdown voltage and high switching speed GaN HEMT with p-GaN gate and hybrid AlGaN buffer layer for power electronics applications 2020 Chin. Phys. B 29 127701

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