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Chin. Phys. B, 2020, Vol. 29(12): 127101    DOI: 10.1088/1674-1056/abb22f
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Characterization and optimization of AlGaN/GaN metal-insulator semiconductor heterostructure field effect transistors using supercritical CO2/H2O technology

Meihua Liu(刘美华), Zhangwei Huang(黄樟伟), Kuan-Chang Chang(张冠张), Xinnan Lin(林信南), Lei Li(李蕾), and Yufeng Jin(金玉丰)†
School of Electronic and Computer Engineering, Peking University Shenzhen Graduate School, Shenzhen 518055, China
Abstract  The impact of supercritical CO2/H2O technology on the threshold-voltage instability of AlGaN/GaN metal-insulator semiconductor high-electron-mobility transistors (MIS-HEMTs) is investigated. The MIS-HEMTs were placed in a supercritical fluid system chamber at 150 °C for 3 h. The chamber was injected with CO2 and H2O at pressure of 3000 psi (1 psi6.895 kPa). Supercritical H2O fluid has the characteristics of liquid H2O and gaseous H2O at the same time, that is, high penetration and high solubility. In addition, OH- produced by ionization of H2O can fill the nitrogen vacancy near the Si3N4/GaN/AlGaN interface caused by high temperature process. After supercritical CO2/H2O treatment, the threshold voltage shift is reduced from 1 V to 0.3 V. The result shows that the threshold voltage shift of MIS-HEMTs could be suppressed by supercritical CO2/H2O treatment.
Keywords:  MIS-HEMTs      threshold-voltage instability      gate stress      temperature influence  
Received:  08 May 2020      Revised:  31 July 2020      Accepted manuscript online:  25 August 2020
PACS:  71.55.Eq (III-V semiconductors)  
  73.20.-r (Electron states at surfaces and interfaces)  
  73.50.-h (Electronic transport phenomena in thin films)  
Fund: Project supported by Shenzhen Science and Technology Innovation Committee (Grant Nos. ZDSYS201802061805105, JCYJ20190808155007550, QJSCX20170728102129176, and JCYJ20170810163407761) and the National Natural Science Foundation of China (Grant No. U1613215).
Corresponding Authors:  Corresponding author. E-mail: yfjin@pku.edu.cn   

Cite this article: 

Meihua Liu(刘美华), Zhangwei Huang(黄樟伟), Kuan-Chang Chang(张冠张), Xinnan Lin(林信南), Lei Li(李蕾), and Yufeng Jin(金玉丰) Characterization and optimization of AlGaN/GaN metal-insulator semiconductor heterostructure field effect transistors using supercritical CO2/H2O technology 2020 Chin. Phys. B 29 127101

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