Intrinsic Semiconductor
Easyphysics
Intrinsic semiconductor has charge carriers generated mainly by?
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Solution
Incorrect! Answer:
Thermal excitation across band gap
- Intrinsic Semiconductor: A pure semiconductor material (like Silicon or Germanium) without any impurities.
- Carrier Generation: At absolute zero, the valence band is completely full and the conduction band is empty. The material behaves as an insulator.
- Effect of Temperature: As temperature increases, some valence electrons gain enough thermal energy to jump across the forbidden energy gap (Eg) into the conduction band.
- Mechanism: Each electron that jumps leaves behind a vacancy in the valence band called a hole. Thus, electron-hole pairs are created thermally.
- Doping Check: Doping is used to create extrinsic semiconductors. Thermal excitation is the primary source for intrinsic ones.
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About This Question
- Subject
- physics
- Chapter
- semiconductor devices
- Topic
- intrinsic semiconductor
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Thermal excitation across band gap
- Intrinsic Semiconductor: A pure semiconductor material (like Silicon or Germanium) without any impurities.
- Carrier Generation: At absolute zero, the valence band is completely full and the conduction band is empty. The material behaves as an insulator.
- Effect of Temperature: As temperature increases, some valence electrons gain enough thermal energy to jump across the forbidden energy gap (Eg) into the conduction band.
- Mechanism: Each electron that jumps leaves behind a vacancy in the valence band called a hole. Thus, electron-hole pairs are created thermally.
- Doping Check: Doping is used to create extrinsic semiconductors. Thermal excitation is the primary source for intrinsic ones.
This easy difficulty physics question is from the chapter semiconductor devices, covering the topic of intrinsic semiconductor. It appeared in the 2025 exam.
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