What is the cause of formation of depletion layer at a p-n junction?

  1. potential difference between points
  2. diffusion of charges
  3. impurities in semiconductor
  4. all of the above

Answer (Detailed Solution Below)

Option 4 : all of the above
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Detailed Solution

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CONCEPT:

  • The material which is not a good conductor or a good insulator is called as a semiconductor. For example: Silicon, Germanium, etc.
  • The semiconductor device which is used to control the flow of electric current is called a p-n junction diode.

F1 J.K 29.5.20 Pallavi D10

  • The depletion region/layer is an area at the junction where a field is formed because of the formation of a negative charge layer on the p side and a positive charge layer on the n side

EXPLANATION:

  • The holes and electrons formed because of doping or impurities, diffuse to the other side respectively.
  • So when a hole diffuses across the junction, it leaves a negative donor ion and the electron leaves a positive charge on the n side.
  • These oppositely charged layers form a field due to the potential difference between the points which form the depletion region.
  • All of the stated points contribute to the formation of the depletion region at the junction. So option 4 is correct.
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