Question

Assertion (A): We cannot form a p-n junction diode by taking a slab of a p-type semiconductor and physically joining it to another slab of a n-type semiconductor.

Reason (R): In a p-type semiconductor η_e  >> η_h while in a n-type semiconductor η_h >> η_e.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is true, but Reason (R) is false.

• Assertion (A) is false and Reason (R) is also false.

Answer 1

Assertion (A) is true, but Reason (R) is false.

Explanation:

A p-n junction does not require a physical connection between p-type and n-type semiconductors. Assertion (A) is correct. However, the Reason (R) mistakenly indicates that the carrier concentrations are in reverse order. In a p-type semiconductor, η_n >> η_e due to hole dominance, while in an n-type semiconductor, η_e >> η_h due to electron dominance. Therefore, Reason (R) is false.