Porous Silicon Formation and simulation

can any body give me some help about the formation of Porous Silicon.
i am specially interested in the Pore Thickness Formation specillay the
bahavior of current density on it. does any body know if there is a software
tool for the
simulation of current lines in the porous silicon.
thanks
Fahad Ashfaq
Msc Microsys eng
3rdsem
furtwangen
germany