Abstract
We report on ITO-free large-area flexible organic solar cells with embedded thick metal grids. Embedded thick metal grids on flexible substrates allow uniform spin coating of thin layers of PEDOT:PSS (PH1000) semitransparent electrodes and organic semiconductor layers. A transparent SU8 photo-patternable polymer is used as a flexible substrate. Electroplated copper metallic grids, up to 15μm thick, defined by photolithography, produce a shadow area of 5.5% of the active area. Inverted solar cells with an active area of 9.3±0.2cm2, exhibited a fill factor of 0.53±0.06, and an open-circuit voltage of 808±5mV and a short-circuit current density of 5.5±0.5mA/cm2, yielding a power conversion efficiency of 2.4±0.4% under 100mW/cm2 air mass 1.5G illumination. The fill-factor and open circuit voltage values of large-area solar cells are comparable to values reported on small-area solar cells.
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