What is the effect of doping a semiconductor with donor atoms?

Practice Questions

Q1
What is the effect of doping a semiconductor with donor atoms?
  1. Increases hole concentration
  2. Increases electron concentration
  3. Decreases conductivity
  4. Creates a depletion region

Questions & Step-by-Step Solutions

What is the effect of doping a semiconductor with donor atoms?
Correct Answer: Doping a semiconductor with donor atoms increases the electron concentration, making it n-type.
  • Step 1: Understand what a semiconductor is. A semiconductor is a material that can conduct electricity under certain conditions, like silicon.
  • Step 2: Learn about doping. Doping is the process of adding impurities to a semiconductor to change its electrical properties.
  • Step 3: Know what donor atoms are. Donor atoms are impurities that have more electrons than the semiconductor material.
  • Step 4: When donor atoms are added to the semiconductor, they provide extra electrons.
  • Step 5: These extra electrons increase the overall number of free electrons in the semiconductor.
  • Step 6: The increase in free electrons makes the semiconductor more conductive.
  • Step 7: A semiconductor that has been doped with donor atoms is called n-type because it has more negative charge carriers (electrons).
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