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Which type of impurity is to be added to a pure semiconductor to get an n-type semiconductor?
1. Pentavalent impurity
2. Gallium
3. Indium
4. Trivalent impurity

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Correct Answer - Option 1 : Pentavalent impurity
  • The process of adding impurities is called doping.
  • An extrinsic semiconductor is of 2 types: n-type and p-type.
  • When the trivalent impurity is added to an intrinsic or pure semiconductor (silicon or germanium), then it is said to be a p-type semiconductor.
  • Trivalent impurities such as Boron (B), Gallium (G), Indium (In), Aluminum (Al), etc are called acceptor impurity.
  • When a pentavalent impurity is added to an intrinsic or pure semiconductor (silicon or germanium), then it is said to be an n-type semiconductor.
  • Pentavalent impurities such as phosphorus (P), arsenic (As), antimony (Sb), etc are called donor impurity.

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