A semiconductor of `Ge` can be made `p`-type by adding

Options

A. Trivalent impurity
B. Tetravalent impurity
C. Pentavalent impurity
D. Divalent impurity

Explanation

To convert a semiconductor of germanium (Ge) into a p-type semiconductor, we need to follow these steps:

### Step-by-Step Solution:

1. **Understanding Semiconductors**:
- Semiconductors can be classified as n-type or p-type based on the type of charge carriers they have. In n-type semiconductors, electrons are the majority carriers, while in p-type semiconductors, holes are the majority carriers.

2. **Identifying p-type Semiconductors**:
- A p-type semiconductor is formed when there is an excess of holes (positive charge carriers) compared to electrons (negative charge carriers). This occurs when trivalent impurities are added to the semiconductor.

3. **Choosing the Right Impurity**:
- To create a p-type semiconductor from germanium, we need to add a trivalent impurity. Trivalent impurities have three valence electrons, which means they can accept an electron from the semiconductor, creating a hole.

4. **Examples of Trivalent Impurities**:
- Common trivalent impurities used for doping germanium include gallium (Ga) and indium (In). These elements have three valence electrons and will create holes when added to the germanium lattice.

5. **Conclusion**:
- Therefore, the correct answer to the question is that a semiconductor of germanium can be made p-type by adding a trivalent impurity.

### Final Answer:
- A semiconductor of germanium can be made p-type by adding **trivalent impurity** (Option A).

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