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

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electrons travel across the junction due to potential difference

Only electrons move from n to p region and not the vice-versa

holes in p-region attract them

electron concentration in n-region is more as compared to that in p-region

answer is D.

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Detailed Solution

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 n-region has greater concentration of electrons than the p-region. Hence, in an unbiased n-pjunction, electrons diffuse from the n-region to the p-region.

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