Field enhanced oxide charge detrapping in n-MOSFET´s

The field dependence of oxide charge detrapping time in a 0.6 /spl mu/m DDD n-MOSFET subject to hot carrier stress was characterized. A series of oxide trap charging and discharging conditions were performed using GIDL current as a direct monitor of the transient characteristics of oxide charge detrapping. An analytical model accounting for the GIDL current transient was developed. The measured result shows that the detrapping time is a strong decreasing function of an oxide field, which suggests that the charge detrapping process is mainly via field enhanced tunneling. A quantitative agreement between the measured and the calculated trap time constants was obtained.