Diffusion current practice problems

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A region of n-type semiconductor extends from x = 0 to x = L = 1 μm.

The electron concentration at x = 0 is 1.0e+13 cm^{-3}
and at x = L, it is 5.0e+12 cm^{-3}.

The electron diffusion coefficient in the region is 35 cm^{2}/s.

What is the electron current density in the region?