In an unbiased p-n junction electrons diffuse from n-region to p-region because :-

Options

A. free electrons in the n-region attract them.
B. they move across the junction by the potential difference.
C. hole concentration in p-region is more as compared to n-region.
D. All the above.

Answer

C

Explanation

The correct statement is (c).
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 greater concentration of holes the n-region. Hence, in an unbiased p-n junction, holes diffues from the p-region to the n-region.