Features

27 October 2006

• Carrier diffusion and drift-diffusion equations:

  • Diffusion equation solver for the excess carriers (excess electron and hole concentrations are equal, no electric field).
    
    • Newton's method.
    • Steady or time dependent solution.
    • Periodic steady-state solution [Harmonic Balance (HB)]. Nonlinear recombination processes taken into account up to the third harmonic.
  
  
  • Drift-Diffusion equation solver using Slotboom's variables formulation and Gummel's map (with inner Newton's loop)
  
  
  • Models (coefficients appearing in the model's equation can be position dependent when it make sens)
  • Boltzmann or Fermi-Dirac statistics
  • Mobility models: Constant (but position dependent), Dorkel-Letruq and Philips Unified Mobility (Klaassen).
  • Band gap narrowing models: Varshini (temperature), Slotboom (doping), Schenk (doping and free carriers).
  • Recombination models: Linear, SRH (doping dependent), Auger.
  • Generation models: Optical generation by Gaussian laser source(s)
  • Absorption model: User specified absorption coefficients and Smith's model (band-to-band indirect absorption)
  • Ambipolar diffusivity: Constant (but position dependent) or computed from electron and hole mobilities (Boltzmann or Fermi-Dirac statistics).
  
  

• Heat equation

  • Diffusion equation solver for the temperature.
    • Steady-state
    • Time dependent
    • Periodic steady-state
  • Models (coefficients appearing in the model's equation can be position dependent when it make sens)
  • Thermal diffusivity and conductivity: Constant (but position dependent)
  • Source term: User provided, excess (relative to the bandgap) laser power density (~hot-carriers thermalization), and carrier recombinations.