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JAMB Physics 2007 Question 11

Question 11

Electronics

Silicon doped with aluminium and germanium doped with arsenic become

  1. A.n- type semiconductors.
  2. B.p- type semiconductors.
  3. C.n- and p- types respectively.
  4. D.p- and n- types respectively.
Show the answer and explanation

Answer: D (p- and n- types respectively.)

Explanation

Aluminium has three valence electrons and creates holes, making p-type silicon. Arsenic has five and gives spare electrons, making n-type germanium.