Which of the following is a p-type semiconductor ?

Options

A. Ge doped with In
B. Si doped with Bi
C. Si doped with Sb
D. Ge doped with As.

Explanation

To determine which of the given options is a p-type semiconductor, we need to understand the concept of p-type semiconductors and the elements involved.

### Step-by-Step Solution:

1. **Understanding P-Type Semiconductors**:
- P-type semiconductors are formed when a tetravalent element (from Group 14 of the periodic table) is doped with a trivalent element (from Group 13).
- The tetravalent elements include carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead (Pb).
- The trivalent elements include boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).

2. **Identifying the Elements**:
- We need to look at the options provided in the question and identify which ones are tetravalent and which are trivalent.
- For example, if the options are:
- A) Germanium (Ge) and Indium (In)
- B) Silicon (Si) and Bismuth (Bi)
- C) Tin (Sn) and Antimony (Sb)
- D) Germanium (Ge) and Arsenic (As)

3. **Analyzing Each Option**:
- **Option A**: Germanium (Ge) is a Group 14 element and Indium (In) is a Group 13 element. This combination can form a p-type semiconductor.
- **Option B**: Silicon (Si) is a Group 14 element and Bismuth (Bi) is a Group 15 element. This combination will not form a p-type semiconductor; it would be n-type.
- **Option C**: Tin (Sn) is a Group 14 element and Antimony (Sb) is a Group 15 element. This combination will also not form a p-type semiconductor; it would be n-type.
- **Option D**: Germanium (Ge) is a Group 14 element and Arsenic (As) is a Group 15 element. This combination will also not form a p-type semiconductor; it would be n-type.

4. **Conclusion**:
- The only option that forms a p-type semiconductor is **Option A: Germanium (Ge) and Indium (In)**.

### Final Answer:
The p-type semiconductor among the options provided is **Germanium (Ge) doped with Indium (In)**.

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