ITO/Au/ITO Multilayer Electrodes for CuPc/C60 Solar Cells

The development of electrodes on polymeric substrates for organic electronics requires deposition at low temperatures, with a limited or no thermal treatment; a process which results in high resistivity materials. To achieve low resistivity films, we tested tri-layer anodes in organic solar cells. A significant improvement of the sheet resistance was obtained without compromising the optical properties. The sheet resistance depends on the gold layer thickness that must be ∼20 nm because of Au absorption. The use of an ITO(30nm)/Au(20nm)/ITO(30nm) anode in CuPc/C60-based photovoltaic cells yielded a clear enhancement of the fill factor leading to an improvement of efficiency.