AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: 98298bbf
What type of semiconductor material is obtained when an intrinsic semiconductor is doped with a trivalent impurity?
What type of semiconductor material is obtained when an intrinsic semiconductor is doped with a trivalent impurity?
Multiple Choice Options
- A
N-type semiconductor
- B
Insulator
- C
Intrinsic semiconductor
- D✓ Correct Option
P-type semiconductor
Detailed Technical Solution & Explanation
When an intrinsic tetravalent semiconductor (such as Silicon or Germanium with 4 valence electrons) is doped with a trivalent impurity (such as Boron, Aluminum, Gallium, or Indium with 3 valence electrons), each impurity atom creates a hole (electron vacancy). This produces a P-type extrinsic semiconductor where holes are majority carriers.
Option Analysis:
•
Option A (N-type semiconductor): Incorrect. Formed by doping with pentavalent impurities (P, As, Sb).
•
Option B (Insulator): Incorrect. Doping dramatically increases electrical conductivity.
•
Option C (Intrinsic semiconductor): Incorrect. Doped semiconductors are extrinsic.
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Option D (P-type semiconductor): Correct. Trivalent doping produces P-type material dominated by hole conduction.
Reference: Mock Test 07NEC Licensure Syllabus