Influence of γ-ray total dose radiation effect on the hot carrier gate current of the uniaxial strained Si nano-scale NMOSFET

The carrier microscopic transport process of uniaxial strained Si n-channel metal-oxide-semiconductor field-effect transistor (NMOSFET) has been analyzed under γ-ray radiation. The variation of oxide-trapped charge (Not) and interface-trap charge (Nit) with the total dose has also been investigated. An analytical model of hot carrier gate current of the uniaxial strained Si nanometer scale NMOSFET has been developed with the degradation due to the total dose irradiation taken into consideration. Based on the model, numerical simulation has been carried out by Matlab. The influence of the total dose, geometry and physics parameters on gate current was simulated. Furthermore, to evaluate the validity of the model, the simulation results were compared with experimental data, and good agreements were confirmed. Thus, the proposed model provides good reference for research on irradiation reliability and application of strained integrated circuit of uniaxial strained Si nanometer scale n-channel metal-oxide-semiconductor field-effect transistor.