EE 230 Electronic Circuits & Systems G. Tuttle

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 p1 = 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 Dp = 10 cm2/V·s.

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

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