The transparent electrode made of conventional flexible transparent conductive film (FTCF) exhibits poor fatigue lifetime due to its brittle indium–tin oxide (ITO) coating. To develop an ITO-free flexible transparent electrode, a poly(ethylene phthalate) (PET) film with a ferric p-toluene-sulfonate (Fe(OTs)3) coating was immersed in 3,4-ethylenedioxythiophene (EDOT) solution for synthesizing poly(3,4-ethylenedioxythiophene) (PEDOT) coating in situ and irradiated with 172 nm VUV through a mask for creating conductive patterns. The sheet resistance and transmittance of the films were measured with four-point probe and spectrophotometer. The conjugative structure and doping level of the synthesized PEDOT coatings were analyzed with UV–vis spectroscope and X-ray photoelectron spectroscope. The effects of processing conditions on the microscopic structures and optoelectronic properties of the coatings were studied. A conductive PEDOT coating formed as a PET film with an Fe(OTs)3 coating was suspended in an EDO...