From my reading from the textbook, we can determine Schottky's diode built-in potential from the x-axis intercept of 1/C^2 vs V from the linear line of the graph. But how to determine if the graphs show nonlinear behaviour? is it still possible to determine it?
Dear Muhammad Hafiz Bin Abu Bakar ,
Dear! What is the cause of getting nonlinear 1/C^2 versus V.
If the doping distribution is known one can fit the C-V curve to get the built in voltage phi.
I will come later to this question
Hello Professor Abdelhalim abdelnaby Zekry , this the C-V for a p-type diode with nitrogen implantation at the surface. From the graph instead of one linear line, I obtained two linear lines. I am not quite sure which line I should use to obtain Vbi.
Dear Muhammad,
Follow the linear part at reverse applied voltage.
Refer to Chapter 5 of my Book
Book Fundamentals of Electronic Devices & Circuits (from A to Z)
Hi Muhammad Hafiz Bin Abu Bakar ,
Based on the plot that you show, it seems clear to me that you have a very homogeneus doping concentration based on the fit in the region -5 to 0 Volts. You should use this fit to find the built-in voltage of the Schottky contact. On the other hand, the "non-linear" behaviour that you observe at positive voltages is related to the current flowing through your Schottky contact (forward state). You shouldnt pay attention on C-V measurements performed on the forward region of a schottky!
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