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In recent years, flexible electronic devices haveattracted much attention. Accordingly, flexible transparent conductive filmsare being researched actively. The commonly used indium tin oxide (ITO)transparent conductive film has limited flexibility. Therefore, we focused onpoly(3,4-ethylenedioxythio- phene)/poly(styrenesulfonate)(PEDOT:PSS)as a substitute material for ITO and are engaged in producing flexibletransparent conductive film using inkjet printers. To improve thecharacteristics of the transparent conductive filmproduced by inkjet printing, based on prior research, we found that cleaning the film substrate with ultraviolet/ozone (UV/O3) andpost-deposition annealing and treatment using polar solvents areeffective for thin films. In this study, we examined the method of applying thepolar solvent. As a result, we were able to improve the homogeneity of the thinfilm surface by applying the polar solvent to each thin film lamination layer.The resulting characteristics obtained for a three-layer printed PEDOT:PSS thinfilm with polar solvent coating were resistivity of 1.49 × 10-3 Ω·cm and transmittance of 84.6%. However, we found that the surface conditionchanged depending on the processing method, affecting the rate of visible lighttransmittance.

The Polar Solvent Application Method for Organic Transparent Conductive Film Produced by an Inkjet Printing Method