Question:
Doping a semiconductor with a trivalent impurity results in:
Doping a semiconductor with a trivalent impurity results in:
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Group 13 → p-type
Group 15 → n-type
Updated On: Jun 10, 2026
- p-type semiconductor
- n-type semiconductor
- intrinsic semiconductor
- perfect insulator
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The Correct Option is A
Solution and Explanation
Concept:
Trivalent impurities (Group 13 elements like B, Al, In) have three valence electrons. When doped into Si or Ge, they create a deficiency of one electron, producing a hole.
Step 1: Bond formation Three covalent bonds form, one bond remains incomplete.
Step 2: Charge carriers The missing electron behaves as a hole (positive charge carrier). Thus, material becomes p-type semiconductor.
Step 1: Bond formation Three covalent bonds form, one bond remains incomplete.
Step 2: Charge carriers The missing electron behaves as a hole (positive charge carrier). Thus, material becomes p-type semiconductor.
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