An-type and P-type silicon can be obtained by doping pure silicon with

Options

A. Arsenic and Phosphorous
B. Indium and Aluminium
C. Phosphorous and Indium
D. Aluminium and Boron

Answer

To solve the question regarding the doping of pure silicon to obtain n-type and p-type silicon, we can follow these steps:

### Step 1: Understand the Types of Doping
- **N-type Silicon**: This is created by doping silicon with pentavalent impurities. These impurities have five valence electrons, which provide extra electrons to the silicon lattice, making electrons the majority charge carriers.
- **P-type Silicon**: This is created by doping silicon with trivalent impurities. These impurities have three valence electrons, creating "holes" in the silicon lattice, making holes the majority charge carriers.

### Step 2: Identify Pentavalent and Trivalent Elements
- **Pentavalent Elements** (for n-type): Arsenic (As), Phosphorus (P)
- **Trivalent Elements** (for p-type): Boron (B), Aluminium (Al), Indium (In), Gallium (Ga)

### Step 3: Analyze the Given Options
The options provided are:
1. Arsenic and Phosphorus
2. Indium and Aluminium
3. Phosphorus and Indium
4. Aluminium and Boron

- **Option 1**: Arsenic and Phosphorus - Correct. Arsenic and Phosphorus are both pentavalent, suitable for n-type.
- **Option 2**: Indium and Aluminium - Incorrect. Both are trivalent, suitable for p-type, not n-type.
- **Option 3**: Phosphorus and Indium - Incorrect. Phosphorus is pentavalent (n-type), but Indium is trivalent (p-type).
- **Option 4**: Aluminium and Boron - Incorrect. Both are trivalent, suitable for p-type, not n-type.

### Step 4: Conclusion
From the analysis, the correct answer for obtaining n-type and p-type silicon through doping is **Option 1: Arsenic and Phosphorus** for n-type, and **Option 4: Aluminium and Boron** for p-type.

### Final Answer
An n-type and p-type silicon can be obtained by doping pure silicon with **Arsenic (for n-type)** and **Boron (for p-type)**.

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