Photovoltaic cells are semiconductors of

Options

A. silicon
B. gallim arsinide
C. cadmium telluride
D. all the above

Answer

To answer the question "Photovoltaic cells are semiconductors of," we will analyze the options provided and the characteristics of each semiconductor material used in photovoltaic cells.

### Step-by-Step Solution:

1. **Understanding Photovoltaic Cells**:
- Photovoltaic cells, also known as solar cells, convert sunlight into electricity. They are made from semiconductor materials that can absorb photons and release electrons, generating electric current.

2. **Identifying Semiconductor Materials**:
- The options given are:
- Silicon
- Gallium Arsenide
- Cadmium Telluride
- All of the above

3. **Analyzing Each Material**:
- **Silicon**:
- Silicon is the most commonly used semiconductor in photovoltaic cells due to its efficient energy conversion and uniform crystalline structure.
- **Gallium Arsenide**:
- This material is known for its high efficiency and resistance to radiation, making it suitable for space applications.
- **Cadmium Telluride**:
- Cadmium telluride is a cost-effective alternative that is highly absorptive of solar energy, making it a popular choice for thin-film solar cells.

4. **Conclusion**:
- Since all three materials (silicon, gallium arsenide, and cadmium telluride) are used in the manufacture of photovoltaic cells, the correct answer to the question is "all the above."

### Final Answer:
Photovoltaic cells are semiconductors of **all the above** (silicon, gallium arsenide, and cadmium telluride).

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