Atomic Layer Epitaxy AlN for Enhanced AlGaN/GaN HEMT Passivation
- 6 August 2013
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Electron Device Letters
- Vol. 34 (9), 1115-1117
- https://doi.org/10.1109/led.2013.2274429
Abstract
Enhancements in AlGaN/GaN high-electron-mobility transistor (HEMT) performance have been realized through ultrathin (4 nm) AlN passivation layers, formed by atomic layer epitaxy (ALE). A combination of ex situ and in situ surface cleans prepare the surface for deposition of ALE AlN. HEMTs passivated by high crystallinity AlN, grown at 500 °C, show improvements in 2-D electron gas sheet carrier density, gate leakage current, off-state drain leakage current, subthreshold slope, and breakdown voltage. In addition, degradation of dynamic on resistance during pulsed off-state voltage switching stress is suppressed by ~50% compared with HEMTs passivated by conventional plasma enhanced chemical vapor deposition SiNx.Keywords
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