Researchers at Queensland University of Technology released a study on flexible perovskite solar cells (f-PSCs). The cells were noted to be lightweight and suitable for portable and wearable devices. The flexibility of the polyethylene naphthalate (PEN) substrate made it difficult to control perovskite layer morphology, resulting in low performance. Differences in thermal expansion between PEN and other layers caused deformation during heating. The study introduced a method using Parafilm-based thermoplastic to bond the flexible substrate to rigid glass, enabling smooth perovskite film formation. Devices achieved over 18 % power conversion efficiency under 1 sun illumination. Performance stability was tested under 8 mm convex and concave bending. After seven days, convex bending reduced efficiency by 47 %, while concave bending caused only a 13 % drop. The larger decline during convex bending was linked to line cracks in the perovskite layer and reduced ITO conductivity.