This study evaluated the possibility of utilizing a spray-coating process for large-rea organic solar cells (OSCs) combined with a metal electrode geometry. The effects of the cell area inspray-coated OSCs were investigated systematically by introducing a metal sub-electrode and grid-electrode to realize large-area cells ofupto12.25cm~2. The series resistance could be reduced significantly by inserting a metal grid-electrode into the indium tin oxide (ITO) anode, yielding a power conversion efficiency of 2.11 at a cell area of12.25cm~2 and 2.49 at an effective photocurrent generated area of 11.23 cm~2 under AM.1.5 simulate dillumination. Thisis comparable to the 3.13 obtained in the cell produced by spray-coating at a cellarea of 0.38 cm~2.
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