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In an unbiased p-n junction, holes diffuse to $n-$ region from $p$ – 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 to n-region.(d) All of the above.
In an unbiased p-n junction, holes diffuse to $n-$ region from $p$ – 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 to n-region.
(d) All of the above.
CBSE | Class 12 | NCERT | Physics | Semiconductor Electronics: Materials, Devices and Simple Circuits
In an unbiased p-n junction, holes diffuse to $n-$ region from $p$ – 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 to n-region.
(d) All of the above.

(c) is the correct option.

The charge carriers’ natural tendency is to disperse from the greater concentration zone to the lower concentration region. As a result, holes disperse from the p-region to the n-region in an unbiased p-n junction because the p-region has a higher concentration of holes than the n-region.

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