What is the purpose of the depletion region in a semiconductor diode?

Question

Answer 1

What is the purpose of the depletion region in a semiconductor diode?

To create a channel for unrestricted current flow in both directions.
To amplify current passing through the diode.
To establish a potential barrier that regulates current flow based on biasing conditions. ✓
To generate light when the diode is forward biased.

Explanation

At the p-n junction, electrons and holes meet and cancel. This leaves a thin zone with no free charges, called the depletion region.

The fixed ions in this zone set up a potential barrier. Forward bias lowers the barrier so current flows. Reverse bias raises it so current is blocked.

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