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We are using the approximation:

I = (I0)*exp(qV/kT)

We measured the voltage and the current for a few different voltages and this could be plotted into a graph. A regression analysis gave the reverse saturation current as I0 = 3.2 x 10^-6 A, and the effective charge carrier charge as q = 4.78 x 10^-21 C.

The diode being used is the 1N4148 junction diode.

Im trying to understand why the carrier charge is not equal to 1.6*10^-19 C. We were told that it has something to do with the data-sheet for this diode. But so far Im not sure what on the sheet I should be looking for and even how this would related to solving this problem.

Any help would be appreciated,

Thanks Ben.