Find the Schottky diode barrier height and the ideality....

  • #1
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Homework Statement


Using the diode equation with moderate forward bias, show numerically how to find the Schottky diode barrier height and the ideality factor via a graphical plot.

Homework Equations


I = I0e(eV/nkT)
I0= AA*T2e-eφb/kT

with n= ideality factor
and φb= Barrier height

The Attempt at a Solution


I tried to look at the plot of ln(I) against V and assumed this would be a straight line graph and so the gradient can be rearranged such that n= eV/kT (ln(I/I0)).

And also they y intercept would just be ln (I0) and I can use this to rearrange and find the barrier height.

I'm not sure if any of this is right, I don't like that I've had to assume a straight line graph, any guidance would be much appreciated!

Thanks
 
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  • #2
for your question!

To find the Schottky diode barrier height and ideality factor using the diode equation with moderate forward bias, you can follow these steps:

1. Plot the diode current (I) on a logarithmic scale against the diode voltage (V) on a linear scale.
2. Use the diode equation (I = I0e(eV/nkT)) to calculate the expected values of the diode current for different values of diode voltage.
3. Plot the expected values of diode current on the same graph as the experimental values.
4. The ideality factor (n) can be calculated by finding the slope of the linear portion of the graph (at moderate forward bias) using the equation n = eV/kT (ln(I/I0)).
5. The Schottky diode barrier height (φb) can be calculated by finding the y-intercept of the linear portion of the graph, using the equation ln(I0) = -eφb/kT.

It is important to note that the diode equation is an approximation and may not perfectly fit the experimental data. Therefore, the values of ideality factor and barrier height calculated may not be exact, but they will give a good estimate of the true values.
 

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