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Increase of Breakdown Voltage on AlGaN/GaN HEMTs by Employing Proton Implantation
Ist Teil von
IEEE transactions on electron devices, 2009-03, Vol.56 (3), p.365-369
Ort / Verlag
New York, NY: IEEE
Erscheinungsjahr
2009
Quelle
IEEE/IET Electronic Library
Beschreibungen/Notizen
The breakdown voltage of new AlGaN/GaN high electron mobility transistors (HEMTs) was increased considerably without sacrificing any other electrical characteristics by proton implantation. The breakdown voltage of proton-implanted AlGaN/GaN HEMTs with 150 KeV 1 times 10 14 -cm -2 fluence after thermal annealing at 400 degC for 5 min under N 2 ambient was 719 V, while that of conventional device was 416 V. The increase of the breakdown voltage is attributed to the expansion of the depletion region under the 2-D electron gas (2-DEG) channel. The depletion region expanded downward into the GaN buffer layer because implanted protons acted as positive ions and attracted electrons in the 2-DEG channel.