question_answer

Which of the following statements concerning the depletion zone of an unbiased PN junction is (are) true [IIT-JEE 1995]

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

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

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

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