HOT-CARRIER EFFECTS AND RELIABLE LIFETIME PREDICTION IN DEEP-SUBMICRON N-CHANNEL AND P-CHANNEL SOI MOSFETS

Hot-carrier effects are thoroughly investigated in deep submicron N- a nd P-channel SOI MOSFET's, for gate lengths ranging from 0.4 mu m down to 0.1 mu m. The hot-carrier-induced device degradations are analyzed using systematic stress experiments with three main types of hot-carr ier injections-maximum gate current (V-g approximate to V-d), maximum substrate current (V-g approximate to V-d/2) and parasitic bipolar tra nsistor (PBT) action (V-g approximate to 0). A two-stage hot-carrier d egradation is clearly observed for all the biasing conditions, for bot h N- and P-channel devices and for all the gate lengths, A quasi-ident ical threshold value between the power time dependence and the logarit hmic time dependence is also highlighted for all the stress drain bias es for a given channel length. These new findings allow us to propose a reliable method for lifetime prediction using accurate time dependen ce of degradation in a wide gate length range.