PEDOT-PSS, Conductivity, Variable range hopping, XPS, UV-Vis 1. Introduction: In the recent years there has been an increasing interest in the field of organic electronics due to its light-weight, high flexibility, and easy processability. Indium-tin oxide (ITO) has been widely used as the transparent electrode in flexible devices, but due to its limitation in mechanical flexibility, large use and high cost there is a great demand for an alternative solution like organic based electrodes…