The GATE Grind

GATE 2025 EC – Question 31

Electronic Devices · Energy Bands and Carrier Concentration · 1 mark · Multiple select

Which of the following can be used as an n-type dopant for silicon?

Select the correct option(s).

  1. Arsenic
  2. Boron
  3. Gallium
  4. Phosphorous

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Correct answer: (A) Arsenic; (D) Phosphorous

Explanation

n-type dopants are group-V donors that supply an extra electron: arsenic and phosphorus. Boron and gallium are group-III acceptors (p-type).