In the depletion layer, the electric field created

Options

A. is from n-side to p-side
B. is from p-side to n-side
C. changes randomly
D. depends on the biasing

Answer

To understand the electric field created in the depletion layer of a semiconductor, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Depletion Layer**:
- In a p-n junction, when p-type and n-type semiconductors are joined, electrons from the n-side diffuse into the p-side and recombine with holes, while holes from the p-side diffuse into the n-side and recombine with electrons. This process creates a region devoid of charge carriers, known as the depletion layer.

**Hint**: Remember that the depletion layer is formed due to the recombination of charge carriers at the junction.

2. **Formation of Charge Layers**:
- As electrons leave the n-side, they leave behind positively charged ions (donor ions), creating a layer of positive charge on the n-side. Conversely, as holes leave the p-side, they leave behind negatively charged ions (acceptor ions), creating a layer of negative charge on the p-side.

**Hint**: Visualize the depletion layer as having positive charges on one side and negative charges on the other side.

3. **Direction of Electric Field**:
- The electric field in a semiconductor is defined as the direction in which a positive test charge would move. Since the positive charge layer is on the n-side and the negative charge layer is on the p-side, the electric field direction will be from the n-side to the p-side.

**Hint**: Always remember that electric field lines point from positive to negative charges.

4. **Conclusion**:
- Therefore, in the depletion layer, the electric field created is directed from the n-side (where there are positive charges) to the p-side (where there are negative charges).

**Hint**: Summarize the electric field direction as "from n to p" to reinforce your understanding.

### Final Answer:
The electric field in the depletion layer is directed from the n-side to the p-side.