Gate-Bias-Accelerated VTH Recovery on Schottky-Type p-GaN Gate AlGaN/GaN HEMTs

• Published in: IEEE transactions on electron devices Vol. 70; no. 9; pp. 4591 - 4595
• Main Authors: Feng, Chao, Jiang, Qimeng, Huang, Sen, Wang, Xinhua, Liu, Xinyu
• Format: Journal Article
• Language: English
• Published: IEEE 01.09.2023
• Subjects: Base voltage; depletion region; Electron traps; HEMTs; Logic gates; MODFETs; p-GaN gate ALGaN/GaN high-electron-mobility transistor (HEMT); PIN photodiodes; Stress; temperature; Threshold voltage
• ISSN: 0018-9383; 1557-9646
• DOI: 10.1109/TED.2023.3297568

In this work, the transient threshold voltage (<inline-formula> <tex-math notation="LaTeX">{V}_{\text {TH}}{)} </tex-math></inline-formula> recovery on Schottky-type <inline-formula> <tex-math notation="LaTeX">{p} </tex-math></inline-formula>-GaN Gate AlGaN/GaN high-electron-mobility-transistors (HEMTs) is measured with a microsecond-level fast-tracking method. It is revealed that, during the gate turn-off transient, the recovery speed of <inline-formula> <tex-math notation="LaTeX">{V}_{\text {TH}} </tex-math></inline-formula>, can be obviously accelerated by applying an appropriate positive forward gate bias, which contradicts the widely used negative gate turn-off voltage. Electrical-field assisted emission of electron trap in the <inline-formula> <tex-math notation="LaTeX">{p} </tex-math></inline-formula>-GaN depletion region is speculated to be the dominant recovery mechanism, by comparing the recovery process between predamage device and fresh device. An electron trap with a 0.30 ± 0.03 eV level depth is extracted by the Arrhenius plot. This work is of great significance for understanding the mechanism of threshold voltage recovery, indicating that a positive gate base voltage may accelerate the <inline-formula> <tex-math notation="LaTeX">{V}_{\text {TH}} </tex-math></inline-formula> recovery.