We systematically investigated the influence of surfactant on processing PEDOT/PSS thin
films by spin-coating technique. As a result, the conductivity of the PEDOT/PSS thin films prepared
by the two-step spin-coating method was to be averagely ca. 400Scm-1 which was calculated with
sheet resistance and thickness. On the other hand, the conductivity of the PEDOT/PSS thin films prepared
by the one-step spin-coating method should be much lower than that of two-step one if assuming that the thickness
is the same for the two methods. It is considerable that in the one-step spin-coating method, aggregation of PEDOT/PSS
colloidal particles easily occurs before spin-coating, resulting in inhomogeneous coating film. Such inhomogeneous film
would show lower conductivity. The two-step spin-coating method can avoid the aggregation and then result in homogeneous
film and higher conductivity. Reviews of recent patents on wet-process techniques reported by other research
groups are also reported.
Keywords: Conducting polymers, PEDOT/PSS, spin-coating, surfactants, transparent electrodes, wet-process.
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