Question

In n-type semiconductor, the Fermi level is present :

• A. just below the valence band
• B. just below the conduction band
• C. just above the valence band
• D. in the middle of valence and conduction bands

Answer 1

The correct option is B just below the conduction band

For an n-type semiconductor, there are more electrons in the conduction band than there are holes in the valence band. This also implies that the probability of finding an electron near the conduction band edge is larger than the probability of finding a hole at the valence band edge. Therefore, the Fermi level is closer to the conduction band in an n-type semiconductor and it lies just below the conduction band.