Question

Match List-I with List-II 

List-I	Semiconductor Type	List-II	Fermi Level Position
A	\(p\)-type semiconductor	II	Fermi level near valence band
B	\(n\)-type semiconductor	III	Fermi level near conduction band
C	Intrinsic semiconductor	I	Fermi level near middle of band gap
D	Degenerate semiconductor	IV	Fermi level inside a band

• A. A-II, B-III, C-I, D-IV
• B. A-I, B-II, C-III, D-IV
• C. A-III, B-IV, C-II, D-I
• D. A-IV, B-I, C-II, D-III

Hint:

Fermi level moves toward valence band in \(p\)-type and toward conduction band in \(n\)-type semiconductors.

Answer 1

The Correct Option is A

Concept:
The position of Fermi level in a semiconductor changes with doping.

Step 1: \(p\)-type semiconductor.
In \(p\)-type semiconductor, Fermi level lies near the valence band. \[ A\rightarrow II \]

Step 2: \(n\)-type semiconductor.
In \(n\)-type semiconductor, Fermi level lies near the conduction band. \[ B\rightarrow III \]

Step 3: Intrinsic semiconductor.
In intrinsic semiconductor, Fermi level lies approximately near the middle of band gap. \[ C\rightarrow I \]

Step 4: Degenerate semiconductor.
In degenerate semiconductor, heavy doping makes Fermi level enter a band. \[ D\rightarrow IV \] Therefore: \[ A-II,\ B-III,\ C-I,\ D-IV \] \[ \therefore \text{Correct Answer is (A)} \]