How do I test the coductivity of PEDOT:PSS?
I am using the direct deposition method to make a PEDOT:PSS film.
But the measured resistivity is very high and the conductivity is very small.
Why do these happen? Is there any operation to increase the conductivity?
Resistance measurement with PEDOT are the same as for any conductive material. The standard would be 4 points measurement of sheet resistivity.
Conductivity depends a lot on the composition and doping. It can be improved with some post treatments (acid, ionic liquid...). Here is a good article to give you an overview of what can be done. That said the conductivity of PEDOT:PSS is limited.
Article Mechanisms for doped PEDOT:PSS electrical conductivity improvement
The doping some solvents or copolymers into PEDOT:PSS can enhance the conductivity of PEDOT:PSS. Many references you could find from websites. The recent developments of different types of PEDOT:PSS formation could achieve very high conductivity. For low conductivity of PEDOT:PSS formation, you may not be able to measure using a four point probe technique. Hall effect measurements could be the best way to do so.
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