# Fermi Level for Silicon

by tot
Tags: fermi, silicon
 P: 26 Well, if we are talking about intrinsic silicon (undoped silicon) then the fermi energy is directly in the center of the band gap. This means that the concentration of holes and electrons is equal. Doping the silicon will move the fermi energy towards the valence band or the conduction band depending on the doping. The band gap for silicon is 1.12eV $$E_f - E_i = kT ln\frac{n}{n_i}$$