Diffusion current practice problems

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Read the Diffusion current class notes.

In some region of a semiconductor, the hole concentration varies sinusoidally with distance, as shown below,

with *p*_{1} = 6.0e+13 cm^{-3} and *L* = 0.7 μm.

Calculate the hole diffusion current density at the point *x* = 0.63 μm.

The hole diffusion coefficient is *D _{p}* = 10 cm

^{2}/V·s.

Note: Be careful with radians versus degrees for the function. In this case, you will likely be using radians.