Fabrication of a Touch Sensor for Flat Panel Displays Using Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate) with Dimethylsulfoxide by Soft Lithography

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In this study, a transparent conductive-polymer-based sensor array designed for use in a touch screen panel was fabricated using soft lithography. One of the most promising conductive polymers, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), was used as the conductive material, and the secondary dopant dimethyl sulfoxide (DMSO) was used to increase the conductivity. The experiments were conducted using various DMSO concentrations in PEDOT:PSS in order to identify the optimum conditions to achieve high conductivity and transmittance. The electrical properties of PEDOT:PSS thin films were investigated using a four-point probe, and their transmittance was determined using an UV--vis spectrometer. The surface morphology was observed by field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). A stable conductivity in the range of 110--204 S/cm was obtained at 0--30% DMSO concentrations, and the transmittances were greater than 92% in the visible range.
2012-09-25