First slide

P-N junction diode

Question

Zener breakdown in a semiconductor diode occurs when

Moderate

A

Forward current exceeds certain value
B

Reverse bias exceeds certain value
C

Forward bias exceeds certain value
D

Potential barrier is reduced to zero

Solution

When reverse bias is increased, the electric field at the junction also increases.
At some stage the electric field breaks the covalent bond, thus the large number of charge carriers are generated.
This is called Zener breakdown.

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