Publication date: 21st July 2025
Ultraflexible perovskite solar cells (PSCs) have attracted significant attention as lightweight and flexible power sources due to their high efficiency and the ultrathin, lightweight nature of plastic substrates with thicknesses on the order of one micron. Although ultraflexible PSCs offer great potential as high power-per-weight (ppw) energy harvesters, their ppw values are still limited by relatively low device efficiencies. This limitation is primarily attributed to the poor thermal stability of conventional ultrathin plastic substrates and the common use of p-i-n architectures in ultraflexible PSCs, where p-type polymer bottom layers are employed to enable low-temperature fabrication.
In this study, we developed highly efficient ultraflexible PSCs with an n-i-p structure on a newly designed 1.5 μm-thick thermally stable plastic substrate composed of parylene and SU-8. The resulting ultraflexible PSCs achieved a power conversion efficiency of 18.2% while maintaining excellent mechanical flexibility, with stable operation under a bending radius as small as 500 μm.
Furthermore, we fabricated an ultraflexible PSC module by connecting six individual cells in series for energy harvest under indoor lighting conditions. By integrating this PSC module with perovskite nanocrystal LEDs, we successfully demonstrated perovskite LED operation powered solely by the harvested energy from indoor light1.
The author acknowledges financial support from JST ACT-X and JST FOREST.
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