Which of the following statements concerning the depletion zone of an unbiased PN junction is (are) true

  • Option 1)

    The width of the zone is independent of the densities of the dopants (impurities)

  • Option 2)

    The width of the zone is dependent on the densities of the dopants

  • Option 3)

    The electric field in the zone is produced by the ionized dopant atoms

  • Option 4)

    The electric field in the zone is provided by the electrons in the conduction band and the holes in the valence band

 

Answers (1)
A Aadil Khan

As learnt in

P-N junction -

When p type semiconductor is mixed with N - type semiconductor, P-N junction formed

 

- wherein

There is very thin region (of the order of micro meter) called depution region.

 

 Width of depletion region depend on densities of dopants. Both electron and holes are responsible for electric field in depletion zone.


Option 1)

The width of the zone is independent of the densities of the dopants (impurities)

This option is incorrect

Option 2)

The width of the zone is dependent on the densities of the dopants

This option is correct

Option 3)

The electric field in the zone is produced by the ionized dopant atoms

This option is incorrect

Option 4)

The electric field in the zone is provided by the electrons in the conduction band and the holes in the valence band

This option is incorrect

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