Hi , while taking repeatedly IV graph from four probe i m getting graph like this , My film is tin selenide . Why am i not getting contact restivity ?
Main goal was to check sheet resistance of the film
using agilant SMU
What is the reason behind a sudden bump near zero ?
what is the reason behind no constant resistance ?
Can we calculate the thick by knowing sheet resistance ??
I am using agilant b 2901a
and "Jandel four probe "
Valentin Bogatu
The resistance is R = Delta(U)/Delta(I) thus you have constant resistance on the positive and negative currents, the inverse of the slope.
The slope is constant, thus the resistance (in absolute value) is constant.
Your mistake is that you compute R at each step as R= U/I not as
R = Delta(U)/Delta(I)
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