Abstract
We studied the electrical conductivity of nanocomposite layers of p-type conductive polymer poly(3,4-ethylenedioxythiophen)-poly(styrene sulfonate) (PEDT/PSS) and the n-type conductive indium tin oxide (ITO) nanoparticles. A decrease in electrical conductivity of PEDT with increasing ITO content up to a volume fraction of about 16 vol % is observed. Above the volume fraction of 16 vol % the conductivity increases very steeply, most probably due to percolation between the ITO-nanoparticles. The analysis of characteristic PEDT infrared absorption bands yields a decrease in the bipolaron absorption and an increase in polaron absorption with increasing ITO content. The shift from bipolaron to polaron absorption is interpreted as “undoping” of PEDT due to a charge transfer between the p-type PEDT/PSS and the n-type conductive ITO nanoparticles. However, an estimation of the depletion length leads to the conclusion that depleted charge carriers only cannot explain the decrease in conductivity. Morphological changes of the system PEDT/PSS by incorporating of the ITO nanoparticles are considered as additional origin for the decrease in conductivity.
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