Zener breakdown takes place if

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(B) Zener breakdown occurs in heavily doped $P-N$ junction diodes.When the doping concentration is high,the width of the depletion layer becomes very

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Doped impurity is high

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(B) Zener breakdown occurs in heavily doped $P-N$ junction diodes.When the doping concentration is high,the width of the depletion layer becomes very thin (typically $10^{-6} \ m$ or less).Due to this thin depletion layer,a strong electric field is established across the junction even for a small reverse bias voltage.This strong electric field is sufficient to pull electrons out of their covalent bonds,leading to a large current flow known as Zener breakdown.

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