 In metals, the Fermi level lies in the conduction band (see Band Theory, above) giving rise to free conduction electrons.However, in semiconductors the position of the Fermi level is within the band gap, about halfway between the conduction band minimum (the bottom of the first band of unfilled electron energy levels) and the valence band maximum (the top of the band below the conduction band, of filled electron energy levels).That applies for intrinsic (undoped) semiconductors.