fsem-developers — Detailed discussions about the source code by and for FSEM developers

[Fsem-developers] Modelling tunnel barriers and semiconductors

[CRETE D. <den...@cn...>]

Hello, is there an example of MIS diode provided either in the FSEM toolbox or somewhere else ?

Thank you in advance,

Denis

[Fsem-developers] TODO list before first release

[Fabian D. <Fab...@sc...>]

Things that should be done before first FSEM official release:

Models/Equations:

 - Flag to choose between Cylindrical or Rectangular coordinates.
 - Implement Nv* and Nc* , the effective density of states in
Fermi-Dirac Statistics. Use include in C++ to reuse Fermi1/2 integral
calculation. 
 - Add global variable for affinity. So it is easier to draw conduction
and valence band. 


Solver:

 - Implement Newton's method with damping. This is needed to solve the
potential equation in the case of a PN junction at equilibrium. Without
damping, the increment can be as large as 60 V. A maximum increment of 1
V is should be used.
 - Use relative (instead of absolute) convergence criterium in Newton's
method


Helper functions and outputs:

 - Better information output during Gummel loop.
 - Better formating of ouput in general
 - Add function to save ALL global variables to a single gmsh file
 - Add function for easy doping definition (Box, erfc, Gaussian) 


Electrical contact:

 - Implement electrical contacts for DDSG.  At least Ohmic.
 - Add example with PN junction with applied bias.


Miscelaneous:

- Update documentation. Should explain what is solved exactly (-> copy
of some appendices of my thesis)
- send C++ patch to Frédéric Hecht so that FreeFem++ can use external
functions with more arguments.


Fabian

[Fsem-developers] Drift-Diffusion solver completed

[Fabian D. <Fab...@im...>]

The drift-diffusion solver has been integrated to FSEM. The first
official release of FSEM should appear in the next few days.
Thanks to Janusz for his important contribution!


********
Fabian Dortu
  
Materials and Components Analysis group (MCA)
SPDT division
   
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
e-mail: Fab...@im...
*************************************************************