Abstract:
The current behaviors of fully depleted (FD) symmetric double-gate (DG) metal–oxide–semiconductor field effect transistors (MOSFETs) with doped short-channel were parametrically modeled with the simple closed-form in all operational regions. In the diffusion current model, a physical parameter DG as a function of gate bias (VGS), drain bias (VDS), silicon body width (WB), channel length (L), and channel doping concentration (Nb) was introduced to consider the VGS dependence. Also, the subthreshold slope (SS) of DG MOSFETs with doped channel was modeled accurately with DG. DD which is dependent on VDS was introduced to consider the drain-induced barrier lowering (DIBL) in the diffusion current model. After the strong inversion, the drift current of doped DG MOSFETs was modeled by considering inversion-layer capacitance based on charge-sheet approximation. The channel length modulation by VDS was considered for accuracy in the current modeling of DG MOSFETs with doped short-channel. Our simple compact models predicted accurately DC characteristics of the devices with the channel length to 20 nm and shown good agreement with two-dimensional (2D) simulation.