First slide

P-N junction diode

Question

In an unbiased p-n junction, if dope concentration in p-region is more than that in n-region, then

Easy

A

diffusion current flows from n-region to p-region
B

drift current flows from n-region to p-region.
C

electric field in the depletion layer is directed from p-region to n-region.
D

depletion layer penetrates the n-region more deeply than the p-region.

Solution

Concentration of holes in the p-region is more than the concentration of free electrons in the n-region Electrons diffuse into p-region, they recombine with holes in extremely narrow region near the interface of p and n regions.
Hence option (4) is right.

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