Abstract
The two-dimensional (2-D) channel potential and threshold voltage of the silicon-on-insulator (SOI) four-gate transistor (G4-FET) are modeled. The 2-D analytical body potential is derived by assuming a parabolic potential variation between the lateral junction-gates and by solving Poisson's equation. The model is used to obtain the surface threshold voltage of the G4-FET as a function of the lateral gate bias and for all possible charge conditions at the back interface. The body-potential model is extendable to fully depleted SOI MOSFETs and can serve to depict the charge-sharing and drain-induced barrier-lowering effects in short-channel devices
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