Advancing Flexible Perovskite Solar Technology with Benzamide-based Molecules for Greater Mechanical Robustness

Flexible perovskite solar cells have garnered significant interest for their potential in lightweight, high-efficiency applications. However, issues like poor interfacial adhesion and significant deformation of flexible substrates at the perovskite-substrate interface have hindered their performance. By integrating entinostat into the hole transport material poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine), we have enhanced adhesion and decreased voids at this interface. These improvements have increased the power conversion efficiency of the flexible perovskite solar cells to 23.4% and raised the certified aperture efficiency of minimodules to 19.0%. Further developments in surface coverage and stability are being pursued with two new molecules, tucidinostat and domatinostat. Initial findings indicate that these additions may significantly enhance film crystallinity and uniformity, potentially redefining performance standards for the durability and efficiency of flexible perovskite solar cells. Our continued research seeks to refine the molecular engineering of perovskites to optimize photovoltaic efficiency for commercial application.