In a p-n junction with open ends: - Vidyadip

MCQ

In a $p-n$ junction with open ends:

A
There is a constant electric field near the junction.
B
Holes and conduction electrons systematically go from the $p-$side to the $n-$side and from the n side to the $p-$side respectively.
C
There is no net charge transfer between the two sides.
✓
All of the above

✓

Answer

Correct option: D.

All of the above

Because of the difference in the concentration of charge carriers in the $p−n$ junction, holes from the $p$ side move to the $n$ side and electrons from the $n$ side move to the $p$ side. This motion of charge carriers gives rise to diffusion current.
Because of this, a negative space charge region is formed in the $p$ region and a positive space region is formed in the $n$ region. This sets up an electric field across the junction. Thus, there is a constant electric field near the junction.
This electric field further opposes the diffusion of majority charge carriers across the junction. As a result, an electron from the $p$ region starts moving to the $n$ region and a hole from the $n$ region starts moving to the $p$ region. This sets up drift current. Thus, there is a systematic flow of charge carriers across the junction. Also, there is no net charge transfer between the two sides.

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