• TCAD Examples

    TCAD Examples

vaex02.in : Silicon Nanowire N-FET IV characteristics using RG

Requires: Victory Atomistic
Minimum Versions: Victory Atomistic 1.4.0.R

This example demonstrates transport simulation of a 2x2 nm2 cross-section silicon nanowire n-FET with a 7nm channel length and 1nm EOT. A silicon nanowire with the dimensions of 4-by-4 Si unit cells (2.172 nm by 2.172 nm) is built, and the band structure calculations are solved with a 10-bands sp3d5s* tight-binding basis, which is provided by the VA all.mat material database.

The example uses a user friendly Meta-Solver that encapsulates all the necessary solvers conforming to the Non Equilibrium Green's Functions NEGF formalism. The python Meta-solver is used for performing an NEGF transport simulation coupled with the nanowire electrostatic. For the semiconductor nanowire of square cross-section, various geometries of the gate oxide and the grid are allowed: top, bottom, or double grid, and gate-all-around. The Metasolver implements a recursive RGF solver in ballistic mode (defautl) coupled with a non-linear Poisson solver and a Sancho-Rubio solver for the leads. The user can turn ON scattering mechanisms for electron-phonon interactions in the self-consistent Born approximation: acoustic, optical, and polar optical phonons. RGF calculations rely on a low-rank approximation LRA of type modespace to drastically reduce the computational load. A custom unitary matrix needs to be provided to perform the LRA projection. The LRA basis can be used for any nanowire with an identical cross-sectional area and any channel length. VA implements an original mode-space scheme which is compatible with the self-consistent Born approximation for electron-phonon scattering.

To load and run this example, select the Load button in DeckBuild > Examples. This will copy the input file and any support files to your current working directory. Select the Run button in DeckBuild to execute the example.

Input Files
Output Results
These examples are for reference only. Every software package contains a full set of examples suitable for that version and are installed with the software. If you see examples here that are not in your installation you should consider updating to a later version of the software.
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