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Schematic of inkjet-printed cell structures and cell performance with optimized parameters. (A) The structure of a printed cell. (B) GO ink and rGO ink were printed onto paper substrate with silver electrodes. (C) Optical microscope images of printed strips reflect the good printability of GO and rGO inks. (D) I-V characteristic of the cell with optimized thickness (H), overlap width (L1), and distance to electrodes (L2) at 25 °C RH 70%.
