Doping of silicon (Si) with boron (B) leads to:

Options

A. n-type semiconductor
B. Insulator
C. Metal
D. p-type semiconductor

Answer

To answer the question regarding the effect of doping silicon (Si) with boron (B), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Doping in Semiconductors**:
- Doping is the process of adding impurities to a semiconductor to change its electrical properties.

2. **Types of Semiconductors**:
- There are two main types of semiconductors: n-type and p-type.
- N-type semiconductors are created by doping with elements from group 15 of the periodic table (e.g., phosphorus).
- P-type semiconductors are created by doping with elements from group 13 (e.g., boron).

3. **Doping Silicon with Boron**:
- Silicon (Si) is a group 14 element and has four valence electrons.
- Boron (B), being a group 13 element, has three valence electrons.
- When boron is added to silicon, it creates "holes" (positive charge carriers) because boron can only form three bonds with silicon atoms, leaving one silicon atom without a bond.

4. **Formation of P-Type Semiconductor**:
- The presence of these holes allows for the conduction of electricity, as electrons from neighboring silicon atoms can jump into these holes, effectively allowing current to flow.
- Thus, silicon doped with boron behaves as a p-type semiconductor.

5. **Conclusion**:
- Therefore, doping silicon with boron leads to the formation of a p-type semiconductor.

### Final Answer:
The doping of silicon (Si) with boron (B) leads to the formation of a **p-type semiconductor**.

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