A semiconductor is doped with an indium impurity atom. Which of the following statements is true abo

JAMB Physics 2023 342 views
Source: JAMB · 2023

A semiconductor is doped with an indium impurity atom. Which of the following statements is true about the resulting semiconductor?

  1. The semiconductor will have an excess of electrons.
  2. The semiconductor will have an excess of holes. ✓
  3. The semiconductor will have equal numbers of electrons and holes.
  4. The semiconductor will become an insulator.
Explanation

Indium has three outer electrons, while silicon or germanium has four. Each indium atom leaves one missing electron, which is a hole.

This makes a p-type semiconductor, with an excess of holes. Donor atoms with five outer electrons would give an excess of electrons instead.

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