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JEE Main levelSingle correct optionDifficulty 2 of 3ss207

Germanium is doped with a trace of gallium. The doped crystal is

  1. An-type, with electrons as majority carriers
  2. Bn-type, with holes as majority carriers
  3. Cp-type, with electrons as majority carriers
  4. Dp-type, with holes as majority carriers

Answer: D

Gallium is in group 13 with three valence electrons, so each Ga leaves an electron deficiency (hole) in the bonding of Ge. Holes are the majority carriers, so the semiconductor is p-type.
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