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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits2 Marks
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?
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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.
  1. When forward biased, width of depletion layer decreases.
  2. And value of barrier potential also reduces as v0 - v.

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