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In an extrinsic semiconductor doped with trivalent impurity, _______.
1. both electrons and holes become majority carriers
2. both electrons and holes become minority carriers
3. electrons become the minority carriers and holes the majority carriers
4. electrons become the majority carriers and holes the minority carriers
5. None of the above

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Correct Answer - Option 3 : electrons become the minority carriers and holes the majority carriers

CONCEPT:

  • The material which is not a good conductor or a good insulator is called as the semiconductor.
  • For example: Silicon, Germanium, etc.


Two types of semiconductor:

  1. Intrinsic semiconductors: It is an undoped semiconductor or pure semiconductor without adding any impurity
  2. Non-intrinsic or extrinsic semiconductor: It is a semiconductor which is doped with a specific impurity which can deeply modify its electrical properties, making it suitable for electronic applications (diodes, transistors, etc.)
  • Depending upon the impurity added non-intrinsic semiconductors can be classified into P-type and N-type of semiconductors depending on weather semiconductor is rich in holes or electrons.

Explanation:

From the above explanation, we can see that,
There are two types of semiconductors:

  • P-type semiconductor: The semiconductor having holes as majority charge carriers and electrons as a minority charge carrier is called as P-type semiconductor.
    • When a trivalent impurity is doped in intrinsic semiconductor then we got P-type semiconductor.
    • For example: gallium, indium 
  • N-type semiconductor: The semiconductor having electrons as majority charge carriers and holes as a minority charge carrier is called as N-type semiconductor.
    • When a pentavalent impurity is doped in intrinsic semiconductor then we got N-type semiconductor.
    • For example: Arsenic


Hence In an extrinsic semiconductor doped with a trivalent impurity, electrons become the minority carriers and hole the majority carriers

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