Innovative Design and Synthesis of Fullerene-Terpyridine Derivatives for Enhanced Electron Transport in Inverted Perovskite Solar Cells.

In this study, three fullerene derivatives─, , and ─were synthesized and investigated as additives in PCBM-based electron-transporting layers (ETLs) for inverted perovskite solar cells (PVSCs). The incorporation of and into the ETLs led to improved ETL morphology and passivation of crystal defects on the surface of the methylammonium lead iodide (MAPbI) layer. This defect passivation enhanced crystal quality, increased UV-vis absorption, reduced charge recombination, and improved electron mobility in the - and -based PVSCs.

Enhanced Photovoltaic Performance of Inverted Perovskite Solar Cells through Surface Modification of a NiO-Based Hole-Transporting Layer with Quaternary Ammonium Halide-Containing Cellulose Derivatives.

In this study, we positioned three quaternary ammonium halide-containing cellulose derivatives (PQF, PQCl, PQBr) as interfacial modification layers between the nickel oxide (NiO) and methylammonium lead iodide (MAPbI) layers of inverted perovskite solar cells (PVSCs). Inserting PQCl between the NiO and MAPbI layers improved the interfacial contact, promoted the crystal growth, and passivated the interface and crystal defects, thereby resulting in MAPbI layers having larger crystal grains, better crystal quality, and lower surface roughness. Accordingly, the photovoltaic (PV) properties of PVSCs fabricated with PQCl-modified NiO layers were improved when compared with those of the pristine sample.