Fermi Level
In intrinsic semiconductor Fermi level lies approximately:
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About This Question
- Subject
- physics
- Chapter
- semiconductor electronics
- Topic
- fermi level
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Midway in band gap
The Fermi level (EF) represents the energy state at which the probability of occupancy by an electron is exactly 0.5.
- In an intrinsic semiconductor, the concentration of electrons in the conduction band (n) equals the concentration of holes in the valence band (p).
- This symmetry forces EF to lie almost exactly in the middle of the forbidden energy gap (Eg/2).
- In n-type, EF shifts towards the conduction band; in p-type, it shifts towards the valence band.
This easy difficulty physics question is from the chapter semiconductor electronics, covering the topic of fermi level. It appeared in the 2025 exam.
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