Write the two processes that take place in the formation of a p-n junction. Explain with the help of a diagram, the function of depletion region and barrier potential in a p-n junction.

Explanation

### Step-by-Step Text Solution

**1. Introduction to p-n Junction Formation:**
A p-n junction is formed by joining p-type and n-type semiconductors. The formation involves two key processes: diffusion and drift.

**2. Processes Involved in Formation:**
- **Diffusion:**
- In a p-n junction, when p-type and n-type materials are brought together, electrons from the n-type region (which has a high concentration of electrons) start to move towards the p-type region (which has a high concentration of holes).
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