Region which have no free electron and holes in P-N junction is

Options

A. x-region
B. p-region
C. depletion region
D. none of these

Explanation

To solve the question regarding the region in a P-N junction that has no free electrons and holes, we can follow these steps:

### Step 1: Understand the 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 free electrons (negative charge carriers).

**Hint:** Recall the characteristics of P-type and N-type semiconductors.

### Step 2: Analyze Charge Carrier Movement
When the P-N junction is formed, electrons from the N-type region diffuse into the P-type region and recombine with holes. Similarly, holes from the P-type region diffuse into the N-type region and recombine with electrons.

**Hint:** Think about what happens when the two types of materials come into contact.

### Step 3: Identify the Depletion Region
As electrons and holes recombine near the junction, they leave behind charged ions. The P-type region will have positive ions (from the ionized acceptors), and the N-type region will have negative ions (from the ionized donors). This creates a region around the junction that is devoid of free charge carriers (electrons and holes).

**Hint:** Consider the area where recombination occurs and how it affects the surrounding regions.

### Step 4: Define the Depletion Region
The region where there are no free electrons and holes, due to the recombination of charge carriers, is known as the depletion region. This region acts as an insulator and is crucial for the functioning of the P-N junction diode.

**Hint:** Remember the term used to describe the absence of free charge carriers in the junction.

### Final Answer
The region which has no free electrons and holes in a P-N junction is called the **depletion region**.