In this study, we developed a effective processing protocol to modify the electrical conductivity of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films via post-treatment with an alcohol-based solvent, 2-chloroethanol (2-CE), and to improve their performance as a transparent anode in organic photovoltaics (OPVs). Due to its appropriate boiling point, 2-CE is advantageous both for treating as a liquid phase chemical and for drying from the films via evaporation. We compared the optical and electrical properties of the 2-CE-treated PEDOT:PSS with those of standard 5 vol% dimethyl sulfoxide (DMSO) added PEDOT:PSS. With a similar thickness and transmittance in the visible region, the 2-CE-treated polymer electrodes surpassed the DMSO-added films with regard to the electrical conductivity. Additionally, we conducted X-ray Photoelectron Spectrometer (XPS), Ultraviolet Photoelectron Spectroscopy (UPS), J-V characteristic, Photoluminescence (PL), Impedance spectroscopy.
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