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Manipal MET2019PhysicsSemiconductors

If no external voltage is applied across p-n junction, there would be

Options

  1. Ano electric field across the junction
  2. Ban electric field pointing from n -type to p-type side across the junction
  3. Can electric field pointing from p -type to n -type side across the junction
  4. Da temporary electric field during formation of p-n junction that would subsequently disappear

Correct answer

B. an electric field pointing from n -type to p-type side across the junction

Step-by-step solution

Near the junction positive charge is built on n -side and negative charge on P -side. This sets up potential difference across the junction and internal electric field E_i directed from n -side to P -side. The equilibrium is established when the field E_i becomes strong enough to stop further diffusion of the majority charge carriers.

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