TY - JOUR
T1 - Analysis of buffer-trapping effects on gate lag, drain lag and current collapse in AlGaN/GaN HEMTs
AU - Horio, K.
AU - Nakajima, A.
PY - 2008
Y1 - 2008
N2 - Transient simulations of AlGaN/GaN HEMTs are performed in which a deep donor and a deep acceptor are considered in a semi-insulating buffer layer. Quasi-pulsed I-V curves are derived from the transient characteristics, and are compared with steady-state I-V curves. It is shown that the lag phenomena and current collapse could be reproduced. Particularly, the gate lag is correlated with relatively high source access resistance of the FETs. The current collapse is shown to bemore pronounced when the deep-acceptor density in the buffer layer is higher and when an off-state drain voltage is higher, because trapping effects become more significant. It is suggested that to minimize current collapse in AlGaN/GaN HEMTs, an acceptor density in the buffer layer should be made low, although the current cutoff behavior may be degraded.
AB - Transient simulations of AlGaN/GaN HEMTs are performed in which a deep donor and a deep acceptor are considered in a semi-insulating buffer layer. Quasi-pulsed I-V curves are derived from the transient characteristics, and are compared with steady-state I-V curves. It is shown that the lag phenomena and current collapse could be reproduced. Particularly, the gate lag is correlated with relatively high source access resistance of the FETs. The current collapse is shown to bemore pronounced when the deep-acceptor density in the buffer layer is higher and when an off-state drain voltage is higher, because trapping effects become more significant. It is suggested that to minimize current collapse in AlGaN/GaN HEMTs, an acceptor density in the buffer layer should be made low, although the current cutoff behavior may be degraded.
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U2 - 10.1002/pssc.200778401
DO - 10.1002/pssc.200778401
M3 - Conference article
AN - SCOPUS:70349361793
VL - 5
SP - 1898
EP - 1901
JO - Physica Status Solidi C: Conferences
JF - Physica Status Solidi C: Conferences
SN - 1862-6351
IS - 6
T2 - 7th International Conference of Nitride Semiconductors, ICNS-7
Y2 - 16 September 2007 through 21 September 2007
ER -