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Distinguish between intrinsic and extrinsic semiconductors.

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Distinguish between intrinsic and extrinsic semiconductors.

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1. Intrinsic: 

  • These are pure semiconducting tetravalent crystals.
  • Their electrical conductivity is low. 
  • There is no permitted energy state between valence and conduction band. 
  • Their electrical conductivity depends on temperature.

2. Extrinsic:

  • These are semiconducting tetravalent crystals doped with impurity atoms group III (or) V. 
  • Their electrical conductivity is high. 
  • There is no permitted energy state of the impurity atom between valence and conduction band. 
  • Their electrical conductivity depends on temperature as well as dopant concentration.
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