# Tag Info

### What does it mean if the Fermi level crosses into the valence band? How about into the conduction band?

The terms "conduction band" and "valence band" sort of lose their usefulness if you are not talking about a standard band insulator where you have a filled valence band and the ...
• 695
In the book by Naeman, Semiconductor Physics, the equation $$E_F -E_{Fi}=kT\ln{\frac{n_0}{n_i}}$$ is derived and relates the change in the Fermi level due to doping. $E_F$ is the Fermi level after ...