What are n-type semiconductors ?

Explanation

### Step-by-Step Solution:

1. **Definition of n-type Semiconductors**:
- n-type semiconductors are materials that are created by doping a pure semiconductor (like silicon or germanium) with a pentavalent impurity.

2. **Doping Process**:
- Doping involves introducing a small amount of an impurity into the semiconductor material. In the case of n-type semiconductors, the impurity is pentavalent, meaning it has five valence electrons.

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