Development of Inverted Flexible Perovskite Solar Cells on Flexible Substrate

Abstract

In this project, fabrication and efficiency evaluation of PSCs in both conventional and inverted architectures on rigid and flexible substrates is studied. The PSCs are started from conventional PSCs on FTO glass to establish a base from which to develop the processes, reaching a peak power conversion efficiency (PCE) of 10.9%. The work is subsequently extended to inverted PSCs on rigid ITO substrates and optimization of interface layers and spin coating conditions resulted in a best efficiency of 8.1%. Hence, the inverted architecture was finally successfully applied to a flexible polyethylene terephthalate (PET) substrate, yielding a maximum efficiency of 3.5%. Finally, these results indicate that flexible PSCs can be fabricated using inverted architectures but underscore the significance of layer deposition, interfacial adhesion and mechanical processes of handling. Our findings offer a roadmap to scale up and improve the cost of scalable flexible perovskite solar cells for future energy applications.