Large-are organic solar cells with metal sub-electrode on ito anode

This paper described the effects of the electrode geometry combined with the cell area on the device performance fabricated by spray-coating method. We investigated the effects of cell size in organic solar cells (OSCs) by introducing of metal sub-electrodes to clearly define the geometry of the cell and realizing large-area cells up to 4.08 cm2. It is demonstrated that the series resistance could be reduced significantly by inserting metal sub-electrodes onto the ITO anode, yielding a power conversion efficiency (PCE) of 2.6±0.3 % up to the cell area of 4.08 cm2. This suggests that OSCs with sub-electrode geometry can be used for evaluating new materials and processes with accurate measurements on the centimeter scale.