SOLUTION

The diffusion capacitance occurs due to the stored charge of minority electrons and minority holes near the depletion region. Diffusion capacitance is also sometimes referred to as storage capacitance.

• When a P-N junction is forward biased, a capacitance that is much larger than the transition capacitance comes into play. This type of capacitance is called Diffusion Capacitance.
• Diffusion capacitance occurs due to the stored charge of minority electrons n minority holes near the depletion region.
• When the width of the depletion region decreases, then diffusion capacitance increases.