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This paper describes breakdown characteristics of AlGaN/GaN high electron mobility transistors (HEMTs) with multi-finger gate patterns. We studied the spatial profile of electroluminescence (EL) from AlGaN/GaN HEMTs under high drain and near pinch-off gate bias. As a result, different EL emission profiles and breakdown characteristics were observed depending on the drain electrode pattern of the devices.
GaN High Electron mobility transistors (HEMTs) were electrically step-stressed under high reverse gate bias conditions. Once a threshold voltage is reached, gate current increases about two orders of magnitude. Though critical voltage was determined to be linear with increasing gate length, electrical simulations show that the maximum electric field was similar at the critical voltage (~2 MV.cm-1)...
Location and properties of traps generated in AlGaN/GaN high electron mobility transistors submitted to electrical stress was studied using an integrated electrical and optical methodology. A spatial and spectral electroluminescence study reveals traps generated during both OFF- and ON-state stress to be located in the gate and access region close to the drain side of the gate edge, while UV-light...
UV light-assisted trapping analysis in conjunction with electroluminescence studies was employed to identify the location of traps generated in AlGaN/GaN HEMTs submitted to on-state stress. Our results indicate that UV light-assisted trapping is closely related to traps in the access region close to the gate edges. An increase in the dominant electronic trap density spatially located within the AlGaN...
DC-Step-Stress-Tests of GaN HEMTs have been performed on wafers with and without GaN-cap. The tests consist of a step ramping of drain-source voltage VDS by 5 V every two hours at off-state. The irreversible evolution of leakage current starting at a certain drain voltage has been taken as a criterion for the onset of device degradation. It has been stated that there is a stability limit for VDS depending...
Hot hole trapping was mechanism was reported for GaN HEMTs from observations of electroluminescence changes and threshold voltage shifts. Passivation effect was studied through EL on the surface traps or surface states and proved to be effective in real-time monitoring of HEMT operation.Hole trapping leading to an increase in the drain to source current, and a decrease in the threshold voltage have...
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