Question

Intrinsic semiconductors Ge or Si doped with

• A. indium becomes an n-type semiconductor
• B. antimony becomes a p-type semiconductor
• C. phosphorus becomes a n-type semiconductor
• D. boron becomes a n-type semiconductor
• E. arsenic becomes a p-type semiconductor

Hint:

Remember: - Group 15 elements $\rightarrow$ n-type - Group 13 elements $\rightarrow$ p-type

Answer 1

The Correct Option is C

Concept: Doping in semiconductors:
• Pentavalent impurities $\rightarrow$ n-type (donor)
• Trivalent impurities $\rightarrow$ p-type (acceptor)

Step 1: Classify given elements.

• Phosphorus, arsenic, antimony $\rightarrow$ pentavalent
• Boron, indium $\rightarrow$ trivalent

Step 2: Identify correct statement.
Phosphorus is pentavalent $\Rightarrow$ forms n-type semiconductor.