Conductivity of an extrinsic semiconductor is considerably influenced by : 

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  1. Majority charge carriers originated from doping
  2. Minority charge carriers originated from thermal agitation 
  3. Majority charge carriers originated from thermal agitation 
  4. Minority charge carriers originated from doping

Answer (Detailed Solution Below)

Option 1 : Majority charge carriers originated from doping
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The conductivity of an extrinsic semiconductor is considerably influenced by 1) Majority charge carriers originating from doping.

Explanation:

Extrinsic Semiconductors:

  • These are semiconductors that have been doped with impurities to increase their conductivity.
  • Doping introduces either an excess of electrons (n-type) or an excess of holes (p-type).
  • Majority Carriers:
    • In n-type semiconductors, electrons are the majority carriers.
    • In p-type semiconductors, holes are the majority carriers.
    • The concentration of these majority carriers is significantly higher than the concentration of minority carriers.
  • Conductivity:
    • Conductivity is directly proportional to the concentration of charge carriers.
    • Since doping greatly increases the concentration of majority carriers, they have a much greater influence on conductivity than minority carriers.
  • Minority Carriers:
    • Minority carriers are generated by thermal agitation.
    • Although minority carriers contribute to the current, their number is very small compared to majority carriers.
    • Therefore, they have very little effect on the conductivity of an extrinsic semiconductor.

Therefore, the correct answer is:

    1. Majority charge carriers originated from doping
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