The drift current in a p-n junction is 20.0 μA. Estimate the number of electrons crossing a cross section per second in the depletion region.

Drift current, Id = 20μA


Where, Ne= Number of electrons crossing a cross section per second


Nh= Number of holes crossing a cross section per second


e= magnitude of charge on an electron/hole = 1.6×10-19 C


Without any biasing applied on the junction, Ne = Nh = N


Id=2N×e




N=6.25×1013


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