In a PN junction diode, the depletion region is formed due to: (2019)

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Q: In a PN junction diode, the depletion region is formed due to: (2019)

Solution: The depletion region in a PN junction diode is formed due to the recombination of electrons and holes at the junction.

Steps: 6

Step 1: Understand that a PN junction diode is made of two types of semiconductor materials: P-type (which has holes) and N-type (which has electrons).
Step 2: When the P-type and N-type materials are joined together, electrons from the N-type region move towards the P-type region.
Step 3: At the same time, holes from the P-type region move towards the N-type region.
Step 4: When electrons meet holes, they recombine. This means they cancel each other out.
Step 5: As electrons and holes recombine, they leave behind a region that has no charge carriers (no free electrons or holes). This area is called the depletion region.
Step 6: The depletion region acts as an insulator, preventing current from flowing freely across the junction.