The potential barrier at a p-n junction is due to the...

The potential barrier at a $p-n$ junction is due to the charges on either side of the junction. These charges are
(a) fixed donor and acceptor ions
(b) minority carriers
(c) majority carriers
(d) both majority and minority carriers

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Key Concepts

Fixed Ionic Charges

Fixed ionic charges refer to the immobile donor ions in the n-type material and acceptor ions in the p-type material. These charges remain in the lattice after mobile carriers have diffused away, and they are responsible for the built-in electric field that leads to the formation of the potential barrier.

Potential Barrier Formation

The potential barrier at a p-n junction forms as a result of the electric field generated by the fixed charges (ionized donor and acceptor ions) in the depletion region. This barrier prevents further diffusion of majority carriers across the junction and establishes equilibrium in the device.

Depletion Region

The depletion region is an area near the p-n junction that is depleted of mobile charge carriers due to the recombination of electrons and holes. This region is characterized by the presence of fixed ionized donor and acceptor atoms, which create an internal electric field.

P-N Junction

A p-n junction is a boundary or interface between p-type and n-type semiconductor materials where holes and electrons meet. This interface is critical in semiconductor devices, as it governs the flow of charge carriers and the formation of key electrical properties.

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