Phylenedioxythiophene Case Study

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Abstract: A one dimensional variable range hopping type conduction is observed in Poly (3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT : PSS) films and the mechanism behind enhancement in conductivity in 3% dimethyle sulfoxide (DMSO) doped PEDOT:PSS film is due to the phase segregation of PSS on the surface and reduction of energy barrier between the conducting grains. Enhanced conductivity of PEDOT:PSS films and transparency more than 80% in the visible region makes PEDOT:PSS films suitable for flexible and transparent optoelectronic devices.

Keywords: PEDOT-PSS, Conductivity, Variable range hopping, XPS, UV-Vis

1. Introduction:
In the recent years there has been an increasing interest in the field of organic electronics due to its light-weight, high flexibility, and easy processability. Indium-tin oxide (ITO) has been widely used as the transparent electrode in flexible devices, but due to its limitation in mechanical flexibility, large use and high cost there is a great demand for an alternative solution like organic based electrodes with both high transparency and high conductivity. Poly (3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT : PSS) has been emerged as a …show more content…
It can be seen from the deconvoluted spectra that various components of S (2p3/2, 2p1/2) signal are coming from PEDOT, PSS-, PSSNa, PSSH. From the spectra PEDOT to PSS ratio was calculated and was found to be decreased from 3.7 for pristine to 2.91 for 3% DMSO doped films which indicates phase segregation with an excess of PSS on the surface. The increase in conductivity due to 3% DMSO doped film is associated with the reduction of insulating PSS shell surrounding conducting PEDOT grains and maintaining a good connectivity between the PEDOT grains. This enhances transportation of carriers between the PEDOT grains easy which in turn increases the

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