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Content Provider | IEEE Xplore Digital Library |
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Author | Sasikumar, A. Zhang, Z. Kumar, P. Zhang, E.X. Fleetwood, D.M. Schrimpf, R.D. Saunier, P. Lee, C. Ringel, S.A. Arehart, A.R. |
Copyright Year | 2015 |
Description | Author affiliation: Electr. & Comput. Eng. Dept., Ohio State Univ., Columbus, OH, USA (Zhang, Z.; Kumar, P.; Ringel, S.A.; Arehart, A.R.) || Electr. Eng. & Comput. Sci. Dept., Vanderbilt Univ., Nashville, TN, USA (Zhang, E.X.; Fleetwood, D.M.; Schrimpf, R.D.) || Texas Instrum. Inc., Dallas, TX, USA (Sasikumar, A.) || Qorvo, Inc., Richardson, TX, USA (Saunier, P.; Lee, C.) |
Abstract | Using quantitative high-electron-mobility-transistors (HEMTs)-based defect spectroscopy, the degradation mechanisms of GaN HEMTs subjected to proton irradiation were explored to understand how these devices would operate in high radiation applications. It was observed that proton irradiation in GaN HEMTs caused a permanent threshold voltage $(V_{T})$ shift (0.59 V) that led to a 30% reduction in IDS, max due to deep traps formed near the valence band edge, and $V_{T}$ dispersion (i.e., time-and voltage-dependent $V_{T}$ instability) increased by ~0.10 V as a result of an $E_{C}-0.72$ eV trap that is most likely located in the GaN buffer layer. While RF accelerated life testing with no irradiation exposure in previous work resulted primarily in $E_{C}-0.57$ eV GaN buffer defect formation/activation localized in the drain access region, the proton irradiation in this work causes degradation through $V_{T}$ shifts mostly through trapping effects under the gate. These results indicate that degradation mechanisms depend strongly on the stressors, and that different defects can cause multiple pathways for HEMT degradation. |
File Size | 320858 |
File Format | |
ISBN | 9781467373623 |
ISSN | 19381891 |
DOI | 10.1109/IRPS.2015.7112688 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2015-04-19 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Gallium nitride Radiation effects HEMTs MODFETs Protons Aluminum gallium nitride Degradation reliability traps deep levels degradation |
Content Type | Text |
Resource Type | Article |
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