Which of the following given statement for semiconductor is correct?

Options

A. p-type semiconductor is formed by doping Si with B
B. p-type semiconductor is formed by doping Si with P
C. n-type semiconductor is formed by doping Si with Al
D. n-type semiconductor is formed by doping Ge with B

Answer

To determine which statement regarding semiconductors is correct, we need to analyze each option based on our understanding of p-type and n-type semiconductors.

### Step-by-Step Solution:

1. **Understanding Semiconductor Doping**:
- Semiconductors like silicon (Si) and germanium (Ge) have limited conductivity. To enhance their conductivity, we introduce impurities through a process called doping.

2. **Types of Doping**:
- **P-type Semiconductor**: Formed by doping silicon or germanium with elements from group 13 of the periodic table (e.g., Boron, Aluminum, Gallium). This creates "holes" that carry positive charge.
- **N-type Semiconductor**: Formed by doping silicon or germanium with elements from group 15 of the periodic table (e.g., Phosphorus, Arsenic). This introduces extra electrons that carry negative charge.

3. **Analyzing Each Statement**:
- **Statement 1**: "P-type semiconductor is formed by doping silicon with boron."
- **Analysis**: Correct. Boron is a group 13 element, and doping silicon with boron creates a p-type semiconductor.

- **Statement 2**: "P-type semiconductor is formed by doping silicon with phosphorus."
- **Analysis**: Incorrect. Phosphorus is a group 15 element, which would create an n-type semiconductor.

- **Statement 3**: "N-type semiconductor is formed by doping silicon with aluminum."
- **Analysis**: Incorrect. Aluminum is a group 13 element, which would create a p-type semiconductor.

- **Statement 4**: "N-type semiconductor is formed by doping germanium with aluminum."
- **Analysis**: Incorrect. Again, aluminum is a group 13 element, leading to a p-type semiconductor.

4. **Conclusion**:
- The only correct statement is the first one: "P-type semiconductor is formed by doping silicon with boron."

### Final Answer:
The correct statement is: **P-type semiconductor is formed by doping silicon with boron.**

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