Degradation/ Oxidation Susceptibility of Composite Semiconductor; Organic Photovoltaic cell of ZnO/PEDOT: PSS/Graphite

A criterion of the degradation/oxidation susceptibility of organic photovoltaic (OPV) cells free of any metallic electrodes is considered. This criterion is used to determine the degradation/ oxidation of ZnO/PEDOT: PSS/Graphite cells in deionized water and in also polluted water with fine particles of sand. The values of Rps were determined by the electrochemical impedance spectroscopy (EIS) at a low frequency. In addition, results of the criterion of ZnO/PEDOT: PSS/Graphite cells was compared with ZnO/PEDOT: PSS/Silver cells in similar media for a predetermined period of OPV operations. In the meantime, the ZnO/PEDOT: PSS/Graphite cell was found to have good degradation resistance during 1000 hrs of exposure to deionized water and polluted water with respect to the standard plots of lim (Rps./Rpair) versus time of exposure.