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Which outcome occurs when the Fermi level nears the conduction band edge in a lightly doped n-type semiconductor?

A)Increased free carrier concentration appears
B)Complete depletion region width increase
C)Band gap energy reduction starts
D)Enhanced electron-phonon interaction emerges

💡 Explanation

An increase in free carrier concentration occurs due to thermal excitation because the Fermi level indicates the probability of electron occupancy; therefore, more electrons populate the conduction band rather than remaining in valence bands due to lower energy gaps.

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