The Total solution for NCERT class 6-12
In an unbiased p-n junction, holes diffuse from the p-regionto n-region because
(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 ton-region.
(d) All the above.
The correct statement is (c).
The diffusion of charge carriers across a junction takesplace from the region of higher concentration to the region of lowerconcentration. In this case, the p-region has greater concentration of holesthan the n-region. Hence, in an unbiased p-n junction, holes diffuse from thep-region to the n-region.