Question

What is meant by the depletion layer in a \(p\)-\(n\) junction? 
 

Hint:

The depletion layer thickness determines the behavior of the \(p\)-\(n\) junction under different biasing conditions.

Answer 1

The depletion layer is the region around the \(p\)-\(n\) junction where mobile charge carriers are depleted, leaving behind immobile ions.
In a \(p\)-\(n\) junction, due to diffusion, electrons and holes recombine near the junction, leaving behind a region with immobile ions. This region forms the depletion layer, acting as a potential barrier for current flow.