Intrinsic Fermi level
= Intrinsic Fermi level
{title2=$E_i$}
The chemical potential fixed by equal conduction-electron and valence-hole densities in an intrinsic semiconductor. In the nondegenerate parabolic-band model, $E_i=(E_c+E_v)/2+(k_{\mathrm B}T/2)\ln(N_v/N_c)$.