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The neutral region formed at P-n junctio...

The neutral region formed at P-n junction due to recombination of electrons and holes is

A

Fermi layer

B

Depletion layer

C

Acceptor layer

D

All the above

Text Solution

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The correct Answer is:
To solve the question regarding the neutral region formed at a P-N junction due to recombination of electrons and holes, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding P-N Junction**: - A P-N junction is formed by joining P-type and N-type semiconductors. The P-type semiconductor has an abundance of holes (positive charge carriers), while the N-type semiconductor has an abundance of electrons (negative charge carriers). **Hint**: Remember that P-type has holes and N-type has electrons. 2. **Recombination Process**: - When the P-N junction is formed, electrons from the N-side move towards the P-side and recombine with holes. This recombination leads to the formation of fixed ions at the junction. **Hint**: Think about how electrons and holes interact at the junction. 3. **Formation of the Depletion Region**: - As electrons recombine with holes, they leave behind charged ions (positive ions on the P-side and negative ions on the N-side). This creates a region around the junction that is devoid of free charge carriers, known as the depletion region. **Hint**: Focus on the concept of charge neutrality and how it changes at the junction. 4. **Characteristics of the Depletion Region**: - The depletion region is characterized by the absence of free electrons and holes, leading to a built-in electric field due to the fixed ions. This region acts as an insulator and prevents further movement of charge carriers across the junction. **Hint**: Consider the role of the electric field in the depletion region. 5. **Identifying the Correct Term**: - The question asks for the term that describes the neutral region formed at the P-N junction due to recombination. The correct term for this region is the "depletion layer". **Hint**: Recall the terminology used in semiconductor physics. ### Final Answer: The neutral region formed at the P-N junction due to the recombination of electrons and holes is called the **depletion layer**.
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