Question

In an unbiased p-n junction, holes diffuse from the p-region to n-region because ______.

Options

• free electrons in the n-region attract them.

• they move across the junction by the potential difference.

• hole concentration in p-region is more as compared to n-region.

• All the above.

Answer 1

Hole concentration in p-region is more as compared to n-region.

Explanation:

The diffusion of charge carriers across a junction takes place from the region of higher concentration to the region of lower concentration. In this case, the p-region has a greater concentration of holes than the n-region. Hence, in an unbiased p-n junction, holes diffuse from the p-region to the n-region.