A numerical model for simulating MOSFET gate current degradation by considering the interface state generation

In this paper, a new gate current degradation model for n-MOSFET's by considering the interface state generation is proposed. This interface state has been characterized using a new approach and incorporated into a 2D device simulation for predicting the device gate current characteristics due to a hot carrier stress induced effect. Good agreement of the gate current has been achieved as compared with the measurement data for both fresh and stressed devices. This model is not only useful for predicting the gate current degradation, but also as a superior monitor to substrate current for submicron device reliability issues, in particular EPROM or flash EPROM devices.