Abstract
In this paper, we have developed an analytical model of double gate MOSFET using Green's function approach in the subthreshold regime of operation. The exact analytical solution to 2-D Poisson's equation by Green's function approach is redefined and Fourier coefficients are calculated correctly that has a direct impact on the outcomes of the model. The approach considers 2-D mixed boundary conditions and multizone techniques while deriving potential equations. It is observed that the Green's function approach of solving 2-D Poisson's equation in both oxide and silicon region can accurately predict channel potential, subthreshold current (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">sub</sub> ), and subthreshold slope of both long and short channel devices designed with higher as well as lower t <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">si</sub> /t <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ox</sub> oxide thickness ratio.
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