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Analytical Performance of the Threshold Voltage and Subthreshold Swing of CSDG MOSFET

In this research work, the threshold voltage and subthreshold swing of cylindrical surrounding double-gate (CSDG) MOSFET have been analyzed. These analyses are based on the analytical solution of 2D Poisson equation using evanescent-mode analysis (EMA). This EMA provides the better approach in solving the 2D Poisson equation by considering the oxide and Silicon regions as a two-dimensional problem, to produce physically consistent results with device simulation for better device performance. Unlike other models such as polynomial exponential and parabolic potential approximation (PPA) which consider the oxide and silicon as one-dimensional problem. Using the EMA, the 2D Poisson equation is decoupled into 1D Poisson equation which represent the long channel potential and 2D Laplace equation describing the impacts of short channel effects (SCEs) in the channel potential. Furthermore, the derived channel potential close-form expression is extended to determine the threshold voltage and subthreshold behavior of the proposed CSDG MOSFET device. This model has been evaluated with various device parameters such as radii Silicon film thickness, gate oxide thickness, and the channel length to analyze the behavior of the short channel effects in the proposed CSDG MOSFET. The accuracy of the derived expressions have been validated with the mathematical and numerical simulation.