Trapping and reliability issues in GaN-based MIS HEMTs with partially recessed gate
Extensive analysis of the trapping and reliability issues in AlGaN/GaN Metal Insulator Semiconductor (MIS) high electron mobility transistors (HEMTs) The material/deposition technique used for the gate dielectric can significantly influence the main dc parameters (threshold current, subthreshold slope, gate leakage) Current collapse is mainly due to a threshold voltage shift, which is ascribed to the trapping of electrons at the gate insulator and/or at the AlGaN/insulator interface Frequency-dependent C-V measurements demonstrate that optimized dielectric allow to lower the threshold-voltage hysteresis The material/ deposition technique has a significant impact on device robustness against gate positive bias stress
trapping hemt gallium nitride defect degradation breakdown