When an element of group 14 is doped with an element of group 15

Options

A. p - type of semi - conductors are formed
B. n - type of semi - conductors are formed
C. Zeolites are formed
D. Electrolytes are formed

Answer

**Step-by-Step Solution:**

1. **Understanding Doping:**
- Doping refers to the intentional introduction of a small amount of an impurity (foreign element) into a host crystal to modify its electrical properties.

2. **Identifying the Host Element:**
- In this case, we are considering an element from Group 14 of the periodic table as the host. A common example is silicon (Si), which has four valence electrons.

3. **Choosing the Dopant:**
- We will dope the silicon crystal with an element from Group 15. A typical example is arsenic (As), which has five valence electrons.

4. **Analyzing Valence Electrons:**
- Silicon (Group 14) has four valence electrons, all of which are involved in bonding with neighboring silicon atoms.
- Arsenic (Group 15), on the other hand, has five valence electrons. When arsenic is introduced into the silicon lattice, four of its electrons will participate in bonding, while one electron will remain unbonded.

5. **Resulting Charge Carriers:**
- The unbonded electron from arsenic contributes to the conduction process, resulting in an excess of electrons in the silicon crystal. This leads to an increase in the number of negative charge carriers.

6. **Determining the Type of Semiconductor:**
- Since the introduction of the Group 15 element (arsenic) into the Group 14 element (silicon) creates an excess of electrons, this type of semiconductor is classified as an n-type semiconductor.

7. **Final Conclusion:**
- Therefore, when an element of Group 14 is doped with an element of Group 15, an n-type semiconductor is formed.

**Answer: n-type semiconductors are formed when an element of Group 14 is doped with an element of Group 15.**

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