Flexible perovskite solar cells: Materials and devices

Flexible perovskite solar cells (FPSCs) are supposed to play an important role in the commercialization of perovskite solar cells due to their unique properties, such as high efficiency, thin thickness and being compatible with roll to roll (R2R) process for mass production. At present, deformable and lightweight FPSCs have been successfully prepared and applied as power supply by integrating with different wearable and portable electronics, which opens a niche market for photovoltaics. In this mini review, we will introduce the recent progress of FPSCs from the aspect of small-area flexible devices, R2R processed devices with large scale and emerging flexible cells with deformability and stretchability. Finally, conclusion and outlook are provided.