Doping
Easyphysics
Adding pentavalent impurity to silicon creates:
Select the correct option:
Solution
Incorrect! Answer:
n-type semiconductor
Silicon (tetravalent) has 4 valence electrons. Pentavalent impurities (like Phosphorus, Arsenic, or Antimony) have 5 valence electrons.
- Four of these electrons form covalent bonds with neighboring Si atoms.
- The fifth electron is loosely bound and becomes a 'free' charge carrier even at low temperatures.
- Since the majority carriers are now negatively charged electrons, the material is called an n-type (n for negative) semiconductor.
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More doping Practice Questions
About This Question
- Subject
- physics
- Chapter
- semiconductor electronics
- Topic
- doping
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
n-type semiconductor
Silicon (tetravalent) has 4 valence electrons. Pentavalent impurities (like Phosphorus, Arsenic, or Antimony) have 5 valence electrons.
- Four of these electrons form covalent bonds with neighboring Si atoms.
- The fifth electron is loosely bound and becomes a 'free' charge carrier even at low temperatures.
- Since the majority carriers are now negatively charged electrons, the material is called an n-type (n for negative) semiconductor.
This easy difficulty physics question is from the chapter semiconductor electronics, covering the topic of doping. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse semiconductor electronics questions on RankGuru.