P-N Junction Diode and its applications: Practice Problem & Solution
Depletion layer has (for an unbiased PN junction): (1999)
Short Solution (Best for NEET):
To solve this problem, we apply the core principles of P-N Junction Diode and its applications. Understanding the underlying formula is key to arriving at the correct answer below:
In an unbiased p-n junction, the depletion layer is created by the natural diffusion of majority charge carriers across the junction. As mobile electrons and holes cross the boundary and recombine, they leave behind uncompensated positive and negative ions in the crystal lattice.
Because these exposed ions are firmly bound to the lattice structure, they cannot move. As a result, this central region is entirely depleted of mobile charge carriers and contains only immobile, static ions.
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