Question
Explain the terms ‘depletion layer’ and ‘potential barrier’ in a p-n junction diode. How are the (a) Width of depletion layer, and (b) Value of potential barrier affected when the p-n junction is forward biased?
✓
Answer
Depletion layer: It is a layer of immobile ions formed near the p-n junction by diffusion of majority charge carriers and electron-hole recombination.
Potential barrier: It is the potential difference developed across the junction when diffusion current & drift current attains equilibrium across the junction.
Potential barrier: It is the potential difference developed across the junction when diffusion current & drift current attains equilibrium across the junction.
- When forward biased, width of depletion layer decreases.
- And value of barrier potential also reduces as v0 - v.
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