A semiconductor doped with arsenic impurities forms

JAMB Physics 2023 321 views
Source: JAMB · 2023

A semiconductor doped with arsenic impurities forms

  1. a p-type semiconductor with more free electrons than holes
  2. an n-type semiconductor with more free electrons than holes ✓
  3. a p-type semiconductor with less free electrons than holes
  4. an n-type semiconductor with less free electrons than holes
Explanation

Arsenic has five outer electrons, while silicon or germanium has four. Four bond with neighbours and one is left free.

So there are extra free electrons, and the material is n-type with more free electrons than holes.

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