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A simple analytical model for deriving the threshold voltage of a SOI type symmetric DG-MOSFET  

Lee, Jung-Ho (School of Electronic & Electrical Eng., Hongik Univ.)
Suh, Chung-Ha (School of Electronic & Electrical Eng., Hongik Univ.)
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Abstract
For a fully depleted SOI type symmetric double gate MOSFET, a simple expression for the threshold voltage has been derived in a closed-form To solve analytically the 2D Poisson's equation in a silicon body, the two-dimensional potential distribution is assumed approximately as a polynomial of fourth-order of x, vertical coordinate perpendicular to the silicon channel. From the derived expression for the surface potential, the threshold voltage can be obtained as a simple closed-form. Simulation result shows that the threshold voltage is exponentially dependent on channel length for the range of channel length up to $0.01\;[{\mu}m]$.
Keywords
SOI(Silicon On Insulator); DG MOSFET; threshold voltage analysis; short channel effect;
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