In a PN junction, what is the region called where no charge carriers are present

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Question: In a PN junction, what is the region called where no charge carriers are present? (2019)

Options:

Correct Answer: Depletion region

Exam Year: 2019

Solution:

The depletion region is the area around the PN junction where no free charge carriers are present.

In a PN junction, what is the region called where no charge carriers are present? (2019)

In a PN junction, what is the region called where no charge carriers are present? (2019)

Step 1: Understand what a PN junction is. A PN junction is formed when a P-type semiconductor (which has positive charge carriers) is joined with an N-type semiconductor (which has negative charge carriers).
Step 2: Recognize that when the P-type and N-type materials are joined, some charge carriers (electrons and holes) move across the junction.
Step 3: Identify that as these charge carriers move, they leave behind an area that has no free charge carriers.
Step 4: This area with no free charge carriers is called the depletion region.

Depletion Region – The depletion region is the area around the PN junction where no free charge carriers (electrons or holes) are present due to recombination.