Organic photodiodes using polymeric anodes

We have fabricated photovoltaic devices using poly (p-phenylene vinylene) ( PPV) as the active layer and poly (3,4 ethylenedioxythiophene) (PEDOT) dope d with polystyrene sulfonic acid (PSS) and aluminium as electrodes. We have compared the performance of these devices with a device where indium-(in o xide OTO) was used as electrode. Using PEDOT the spectrum of the external q uantum efficiency is constant in a broad range of energy, while devices mad e with ITO show only a very narrow peak at the onset of the absorption. Whe n PPV is converted on top of PEDOT the photoluminescence is more quenched t han on top of ITO, suggesting interfacial reactions between PPV and PEDOT:P SS.