The built-in potential of a p-n junction _______.

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Question

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SSC JE Electrical 06 Jun 2024 Shift 2 Official Paper - 1

Answer 1

Concept:

Energy Band diagram of P-N diode:

E_Fi = intrinsic Fermi level

E_FP = Fermi level of P-type

E_FN = fermi level of n-types

Potential Barrier or Built in potential E₀ = E₁ + E₂

----(1)

So we can say Built-in potential is equal to the difference in fermi level of two sides (E₁ + E₂) and on increasing doping, V_bi will increase

Since,

So if we,
So, the built-in potential of a p-n junction depends on both temperature and doping concentration.