Q106 / 150 · MHT CET 2026 (20 April Shift 1) · Physics
In the band structure of n-type semiconductor , the free electrons donated by impurity atoms occupy energy levels in
- Athe conduction band.
- Bthe valence band.
- Correct answerCthe band gap and are close to conduction band.
- Dthe band gap and are close to valence band.
Solution
In an n-type semiconductor, pentavalent impurity atoms are added, which donate extra electrons.
These donated electrons occupy discrete energy levels known as donor energy levels.
The donor energy levels are located in the forbidden energy gap (band gap) just below the bottom of the conduction band (typically $0.01$ eV to $0.05$ eV below it).
Because they are very close to the conduction band, these electrons can easily be excited into the conduction band at room temperature.
Answer: the band gap and are close to conduction band.
These donated electrons occupy discrete energy levels known as donor energy levels.
The donor energy levels are located in the forbidden energy gap (band gap) just below the bottom of the conduction band (typically $0.01$ eV to $0.05$ eV below it).
Because they are very close to the conduction band, these electrons can easily be excited into the conduction band at room temperature.
Answer: the band gap and are close to conduction band.
Hence, the correct answer is option: 'C'.