Recent Progress Toward Commercialization of Flexible Perovskite Solar Cells: From Materials and Structures to Mechanical Stabilities

Perovskite solar cells (PSCs) are regarded as a marvelous candidate in the revolution of photovoltaic (PV) technology due to the rapid development in the past decade. Flexible perovskite solar cells (FPSCs) are supposed to be an attractive commercialization option with various potential applications, including portable electronics, wearable power sources, and large-scale industrial roofing. FPSCs have the advantages of low cost, high efficiency, light weight, flexibility, and more importantly, the feasibility of mass production with a roll-to-roll industrial process. Recently, many advances in FPSCs have been reported with an efficiency of over 20%. Herein, the critical issues and breakthroughs of FPSCs are elucidated comprehensively, involving materials selection and structure design that are suitable for flexible and durable substrates, transparent electrodes, low-temperature large-area fabrication, and mechanical flexible stability in the corresponding part. Finally, challenges and perspectives toward the commercialization of FPSCs are addressed in future developments.