I have value of resistance of thin film of upper surface which is observed by two probe method. I want to calculate conductivity of thin film. Can anybody suggest me any formula by which i can calculate conductivity of thin film having surface dimension 1.2cm*1.2cm square, thickness of film is 451nm and resistance 1.2ohm.
Dear Rishi,
I think it is better you use four probe measurement to obtain the conductivity. Please check the article below for calculation.
Hope this will help you.
Best!
http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6773368&tag=1
Dear Rishi,
I think it is better you use four probe measurement to obtain the conductivity. Please check the article below for calculation.
Hope this will help you.
Best!
http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6773368&tag=1
I suggest you to check the conductivity value using another method "vander paw method" as well.
http://electroiq.com/blog/2016/10/van-der-pauw-and-hall-voltage-measurements-with-a-parameter-analyzer/
You can try in Hall measurements with Van der Pauw configuration. If you know the thickness of a film.
First, you have to measure resistivity and inverse of it gives conductivity
Thickness of the film is important one to calculate the resistivity because surface layer of the film is not uniformly coated at most of the case. So first up all which instrument are you using to fabricate the film
https://www.researchgate.net/post/How_can_I_measure_the_electrical_conductivity_of_thin_film
We measure the conductivity of thin film using the Four Point Probe Method.
Dear Rishi,
When using two probe method to measure the resistivity of a thin film you have to take into consideration the flowing precautions:
- The probes must make low resistance ohmic contact with the film
- the geometry of the electrodes must be well defined. The most easier geometry is the stripe geometry comprising the width of the specimen say w.
- Then the thickness and the length L must be known. It is advantageous to make L>> w to make the resistance of the film much greater than the contact resistance with electrodes.
Then one can use the expression for determining the film resistivity roh :
Rf= roh L/ wt
where Rf is the film resistance between the two electrodes and t is the thickness of the film.
It is also assumed that the substrate must insulating.
In order to avoid all these precautions one uses four point probe or the Van der Paw method provided also that the substrate must be insulating.
Best wishes
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