Scalable, efficient and flexible perovskite solar cells with carbon film based electrode

Compared with traditional rigid perovskite solar cells fabricated on glass, flexible perovskite solar cells have a wider range of applications due to their lightweight and bendability, which have attracted great attention. Besides, carbon materials have shown some advantages of abundance, long-term stability and appropriate energy level as top electrode in perovskite solar cells. However, the reports of flexible devices based on carbon electrode are quite rare for the mismatch between the configuration of flexible perovskite solar cells and common carbon electrode techniques. Here, we introduce carbon film electrode into flexible perovskite solar cells for the first time. A new composite carbon film electrode is prepared on a highly conductive and flexible substrate of conductive cloth. Considerable PCEs of 15.37% and 14.05% have been obtained in small area (0.1 cm2) and large area (1 cm2) carbon based flexible devices, respectively. The comparable performance with standard Au electrode device, enhanced stability and suitability for roll-to-roll manufacturing reveals promising application of this low-cost composite carbon electrode.