Home Physics Semiconductor Electronics All Topic Question for Revision Test Under which of the following conditions, doe…
Physics Semiconductor Electronics All Topic Question for Revision Test MCQ (Single Correct)

Under which of the following conditions, does an avalanche breakdown in a semiconductor diode occur?

A
When potential barrier is reduced to zero
B
When reverse bias exceeds a certain value
C
When forward bias exceeds a certain value
D
When forward current exceeds a certain value

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Text Solution

Verified by Experts
The correct answer is:
B

Avalanche breakdown occurs in a reverse-biased semiconductor diode.
When the reverse voltage across the diode exceeds a critical value, the electric field becomes strong enough to accelerate free electrons to high velocities.
These high-energy electrons collide with atoms in the lattice, creating more electron-hole pairs, leading to a chain reaction (avalanche).
This results in a sudden large reverse current.

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