Kerala KEAM 5 June 2024 Solved Paper

In a semiconductor, the energy levels can be understood as follows:- $E_c$: Energy of the conduction band.- $E_v$: Energy of the valence band.- $E_D$: Donor energy level in a n-type semiconductor.- $E_g$: Band gap of the semiconductor.For a n-type semiconductor:- The donor level $E_D$ is slightly below the conduction band $E_c$, meaning electrons from the donor energy levels can easily move to the conduction band with minimal energy input.- The band gap $E_g$ is the energy difference between the conduction band and the valence band ($E_c - E_v$).In n-type semiconductors, the donor energy level $E_D$ is closer to the conduction band than to the valence band, so it follows that:$$E_D > E_v$$Thus, the correct answer is:$$\boxed{C) E_D > E_v}$$ Quick Tip: In an n-type semiconductor, the donor energy level is just below the conduction band. This allows electrons from the donor level to easily jump into the conduction band, thereby enhancing conductivity.