In an unblased p-n junction, holes diffuse from the p - region to n- 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 diffusion of charge carriers across a junction takes place from the regions of higher concentration to lower concentration. In this case, the p-region has 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.