| 초록 |
Perovskite solar cells have superior advantages such as high efficiency over 23%, flexibility and solution-processability. Therefore, PSCs can be fabricated by high-throughput and low-cost scalable roll-to-roll (R2R) process. In this context, we fabricate the flexible PSCs by utilizing a gravure printing, which has the benefit of direct pattering of the desired layer with arbitrary shape and size, for the first time. Printing inks and processing parameters are optimized to obtain smooth and uniform films. Perovskite are successfully formed by using optimized printing parameters and subsequent antisolvent bathing. SnO2 nanoparticles as an electron-transporting layer, and Spiro-OMeTAD as a hole-transporting layer are also successfully printed. All-gravure-printed device shows 17.2% of champion efficiency. Furthermore, R2R process based on gravure printing is demonstrated. Partly R2R processed device shows 9.7% champion efficiency. |
