In a Zener diode,breakdown occurs in reverse | vedclass

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Question

(B) Zener diode is a heavily doped $p-n$ junction diode. When it is reverse-biased,the electric field across the depletion region becomes very strong.

Vedclass · Accepted Answer

Internal field emission

Vedclass · Answer

(B) Zener diode is a heavily doped $p-n$ junction diode. When it is reverse-biased,the electric field across the depletion region becomes very strong.This strong electric field exerts a large force on the valence electrons,pulling them out of their covalent bonds.This process is known as internal field emission or Zener effect.While impact ionization (avalanche breakdown) occurs in lightly doped diodes,the primary mechanism for a Zener diode specifically is internal field emission due to high doping.Therefore,the correct option is $B$.

In a Zener diode,breakdown occurs in reverse bias due to

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