Multiple choice technology

When arsenic is added as an impurity to silicon, the resulting material is?

  1. n-type semiconductor

  2. p-type semiconductor

  3. n-type conductor

  4. Insulator
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A Correct answer
Explanation

Arsenic (As) is a Group V element (5 valence electrons). When added to silicon (Group IV, 4 valence electrons) as a dopant, it provides extra electrons, creating an n-type semiconductor. The extra electrons become majority charge carriers. Conversely, Group III elements like boron create p-type semiconductors by creating holes.

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