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Four Point Probe

Four Point Probe

Four Point Probe

Dear Ladys and Gentlemans,

I want to measure the sheet resistance R_square on a printing produkt.
My measuring equipment consists a SMU to supply and measure and a four point Probe by Jandel.
As output size I get the electrical resistance R.
So I have to multiply the geometric factor and a correction factor (correction factor because the width is small)

The derivation for the geometric factor I have found on :

And the correction factor table is shown here, in my case its on page 54

Funny but true, I get twice the value than in the reference measurement system (eddy current technology)
So may we can discuss why?
And the bigger Question: why is the resistance calculated in the derivation with U/2I.
In my opinion there is no superposition of currents because they have a different sign. (look at the attachment)

Thank you in advance

RE: Four Point Probe

What is the layer printed on? What's underneath that?

As a general rule, thin layer resistivity are better measured with a van der Pauw structure https://en.wikipedia.org/wiki/Van_der_Pauw_method

TTFN (ta ta for now)
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