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JAMB Physics 2002 Question 48

Question 48

Electronics

Pure silicon can be converted to a p-type material by adding a controlled amount of

  1. A.pentavalent atoms
  2. B.hexavalent atoms
  3. C.tetravalent atoms
  4. D.trivalent atoms
Show the answer and explanation

Answer: D (trivalent atoms)

Explanation

Trivalent atoms (e.g. boron) have one electron too few for the bonds, which creates holes: p-type.