期刊
IEEE ELECTRON DEVICE LETTERS
卷 43, 期 9, 页码 1404-1407出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2022.3188555
关键词
Gate reliability; p-GaN gate HEMT; AC gate bias stress; switching drain bias; hole insufficiency
资金
- Shenzhen Science and Technology Innovation Committee [JCYJ20170818113423666]
- Hong Kong Innovation and Technology Fund's Midstream Research Programme for Universities (MRP) [MRP-010-21X]
The gate reliability of Schottky-type p-GaN gate HEMTs under AC positive gate bias stress can be prolonged with a switching drain bias, due to the drain-induced hole insufficiency in the gate stack at large V-DSQ. This mechanism suppresses electron injection from the 2DEG channel to the p-GaN gate, weakening hot-electron generation and prolonging the gate lifetime.
With a switching drain bias, the gate reliability of Schottky-type p-GaN gate high-electron-mobility transistors (HEMTs) under AC positive gate bias stress has been systematically investigated. The mean-time-to-failure (MTTF) under such application-relevant stress is found to be prolonged compared to that extracted from static and AC gate bias stress tests with the absence of a switching drain bias and exhibits positive coefficients with frequency and OFF-state drain bias (V-DSQ). Such results can be explained by the drain-induced hole insufficiency in the gate stack at large V-DSQ, a physical mechanism that results in elevated energy band at ON-state when V-DSQ is just switched to low voltage. This non-equilibrium transient status could suppress injection of electrons from the 2DEG channel to thep-GaN gate, which in turn substantiallyweakens the hot-electron's generation in the depleted p-GaN layer and the subsequent bombardment to the gate-metal/p- GaN interface, and thus prolongs the gate lifetime.
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