In a semiconductor diode, barrier potential offers...

In a semiconductor diode, barrier potential offers opposition to only
(A) free electrons in $\mathrm{N}$ region
(B) holes in the P region
(C) minority carriers in both regions
(D) majority carriers in both regions.

Key Concepts

Majority and Minority Carriers

In semiconductor physics, majority carriers are the charge carriers that exist in greater concentration in a doped material (electrons in N-type and holes in P-type), while minority carriers are those present in lower concentrations. The barrier potential primarily impedes the flow of the majority carriers, which are responsible for the conduction in each region of the diode.

Depletion Region

The depletion region is the area around the PN junction where mobile charge carriers have diffused away and recombined, leaving behind fixed ionized dopants. This region creates the electric field responsible for the barrier potential, and it plays a crucial role in determining the diode’s behavior under bias by controlling carrier movement.

Semiconductor Diode

A semiconductor diode is a two-terminal electronic device made from a PN junction, where one side (P-type) is rich in holes and the other (N-type) is rich in electrons. The PN junction allows current to flow primarily in one direction, making diodes essential for rectification, signal modulation, and various circuit applications.

Barrier Potential

The barrier potential in a semiconductor diode is the built-in electric potential created due to the diffusion of majority carriers across the PN junction, which leads to the formation of a depletion region. This potential acts as an energy barrier that opposes the further movement of majority carriers, thereby influencing the diode’s conduction characteristics.

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